Veröffentlichungen





2017

  • A. Talai, R. Weigel, and A. Koelpin, "Efficient radar front-end implementation in LTCC multilayer cavity technology" in IEEE/MTT-S International Microwave Symposium (IMS), 2017 (to be published). [Bibtex]
    @inproceedings{talai2017,
    author  = {Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    title  = {Efficient radar front-end implementation in LTCC multilayer cavity technology},
    booktitle  = {{IEEE/MTT-S International Microwave Symposium (IMS)}},
    year  = {2017},
    month  = {06},
    day  = {06},
    location  = {Hawai'i Convention Center in Honolulu, Hawai‘i},
    publisher  = {IEEE},
    keywords  = {Multilayer,Cavity,LTCC,Antenna},
    url  = {url},
    volume  = {vol},
    number  = {no},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1922},
    abstract  = {Low Temperature Cofired Ceramics (LTCC) is a high-frequency material type that is suitable for multilayer structures and applications. Since its relative permittivity is usually in the region of 6 to 10, microwave structures can be designed in a space-saving way. The implementation of patch-antennas on LTCC, such as radar antennas at 77 GHz, require a lower permittivity in order to achieve a desirable efficiency and focusing capability. Therefore, this presentation will focus on a novel method of using the multilayer capabilities of LTCC in order to decrease the local permittivity below the antennas. Before sintering, carbon inserts are embedded on inner layers below the antennas by using an Nd:YAG laser. It will be demonstrated that these inserts are burned out completely during sintering and the cavity remains. The process requires an adaption of the sintering profile in order to reduce the sinking of the substrate in the middle of the cavity. Within this presentation, the achievable improvements on antenna beams will be presented by comparative simulation results of 77 GHz antennas with and without the embedded cavity. Furthermore, presented measurement results will verify the effects of the cavity.},
    }
  • M. Frank, R. Weigel, and A. Koelpin, "Design of a 24 GHz Reconfigurable Transmitarray Element with Continuous Phase Range" in European Conference on Antennas and Propagation (EuCAP) 2017, 2017 (to be published). [Bibtex]
    @inproceedings{frank2017,
    author  = {Frank, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {Design of a 24 GHz Reconfigurable Transmitarray Element with Continuous Phase Range},
    booktitle  = {{European Conference on Antennas and Propagation (EuCAP) 2017}},
    year  = {2017},
    month  = {03},
    location  = {Paris, France},
    publisher  = {IEEE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1925},
    abstract  = {This paper presents a reconfigurable transmitarray antenna unit cell for a frequency of 24 GHz. A continuous phase range is obtained by loading patches with varactor diodes on the outer layers of a printed circuit board (PCB) while the signal couples through slots in the inner layers. The design, numerical and experimental characterization of the unit cell in a rectangular WR-42 waveguide are reported. A phase tuning range of 120° was achieved with a custom layer stack which could be extended to 145° using solely RF-substrates.},
    }
  • C. Schmidt, J. Nehring, M. Dietz, R. Weigel, D. Kissinger, and A. Hagelauer, "A 10 Gb/s Highly-Integrated Adaptive Pseudo-Noise Transmitter for Biomedical Applications" in IEEE Radio & Wireless Week 2017, 2017 (to be published). [Bibtex]
    @inproceedings{schmidt2017,
    author  = {Schmidt, Christian and Nehring, Johannes and Dietz, Marco and Weigel, Robert and Kissinger, Dietmar and Hagelauer, Amelie},
    title  = {A 10 Gb/s Highly-Integrated Adaptive Pseudo-Noise Transmitter for Biomedical Applications},
    booktitle  = {{IEEE Radio & Wireless Week 2017}},
    year  = {2017},
    month  = {01},
    day  = {17},
    location  = {Phoenix},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1917},
    abstract  = {A highly-integrated (2\^{}11)-1 pseudo-random bit sequence (PRBS) transmitter for biomedical applications is presented. The chip consists of an ultra-wideband synthesizer with an integrated divider to drive a PLL, a linear feedback shift register (LFSR) to generate an M-sequence and a programmable binary divider to enable adaptive subsampling technique in the signal processing path. The circuit is created to be used in a miniaturized portable PRBS based sensor system for biomedical applications. A conceivable application is the measurement of dehydration in a human body. The PRBS generator is capable of generating a bit-rate up to 10 Gb/s, correlating to a maximum bandwidth of the generated sequence of 5 GHz, which is sufficient for the designated applications. The circuit is manufactured in an 0.35 um SiGe-Bipolar technology with an ft of 200 GHz using 12 mm\^{}2 chip area.},
    }
  • F. Pflaum, S. Erhardt, R. Weigel, and A. Koelpin, "RSSI-based Localization With Minimal Infrastructure Using Multivariate Statistic Techniques" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2017 (to be published). [Bibtex]
    @inproceedings{pflaum2017,
    author  = {Pflaum, Felix and Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {RSSI-based Localization With Minimal Infrastructure Using Multivariate Statistic Techniques},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2017},
    month  = {01},
    location  = {Phoenix, AZ, USA},
    keywords  = {wireless,wsn,lda,statistics,localization},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1841},
    abstract  = {In this paper a new approach to localization of mobile nodes in wireless sensor networks is presented which utilizes the measurement of the received signal strength indicator by multiple receivers concentrated in a small area and applies the technique of linear discriminant analysis to the received data. The concept of gathering all receivers at a single spot provides great flexibility, while good spatial resolution is still achieved. This is demonstrated by a test network operating in the sub-GHz-range around 868 MHz.},
    }
  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, "Segmental Polynomial Approximation based Phase Error Correction for Precise Near Field Displacement Measurements using Six-Port Microwave Interferometers" in IEEE Topical Meeting on Wireless Sensors and Sensor Networks (WiSNet), 2017 (to be published). [Bibtex]
    @inproceedings{will2017,
    author  = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {Segmental Polynomial Approximation based Phase Error Correction for Precise Near Field Displacement Measurements using Six-Port Microwave Interferometers},
    booktitle  = {{IEEE Topical Meeting on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2017},
    month  = {01},
    day  = {15},
    location  = {Phoenix, Arizona, USA},
    publisher  = {IEEE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1842},
    abstract  = {Six-Port microwave interferometers are a lowcost as well as low-power type of radar sensor with a high phase accuracy, which can be used for precise displacement measurements. Near field effects strongly influence the signal characteristics of a reflection of the electromagnetic wave near the antenna, especially if the target is low reflective. In this paper a calibration procedure based on phase error correction by segmental polynomial approximation is proposed that utilizes these effects. After validating the functionality of the calibration algorithm and its improvement by comparison to a comparable state-of-the-art procedure, two further near field measurements are presented. A cardboard as well as a plastic plate are used as low reflecting targets to show the applicability of the proposed calibration procedure for diverse measurement scenarios.},
    }
  • S. Linz, C. Will, F. Lurz, S. Lindner, S. Mann, R. Weigel, and A. Koelpin, "Detector Nonlinearity in Six-Port Radar" in IEEE Topical Meeting on Wireless Sensors and Sensor Networks, 2017 (to be published). [Bibtex]
    @inproceedings{linz2017,
    author  = {Linz, Sarah and Will, Christoph and Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Detector Nonlinearity in Six-Port Radar},
    booktitle  = {{IEEE Topical Meeting on Wireless Sensors and Sensor Networks}},
    year  = {2017},
    month  = {01},
    location  = {Phoenix, USA},
    publisher  = {IEEE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1852},
    abstract  = {This paper presents an in-situ detector characterization and calibration method for differential I/Q Sixport radar systems. A separate calibration of the nonlinear detectors and the linear Six-port front-end enables an independent analysis of errors caused by detector nonlinearity and by the measurement scenario. A linearity analysis of various detectors in Six-port radar systems shows the necessity of a detector calibration for accurate displacement measurements. The calibration is evaluated with three different Six-port front-ends at 24 GHz in divers measurement scenarios. An error reduction of up to 50\% has been achieved.},
    }
  • M. Haberl, B. Sanftl, M. Trautmann, R. Weigel, and A. Koelpin, "A Direct RF-to-Baseband Quadrature Subsampling Receiver Using a Low Cost ADC" in IEEE Radio and Wireless Symposium 2017, 2017 (to be published). [Bibtex]
    @inproceedings{haberl2017,
    author  = {Haberl, Matthias and Sanftl, Benedikt and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {A Direct RF-to-Baseband Quadrature Subsampling Receiver Using a Low Cost ADC},
    booktitle  = {{IEEE Radio and Wireless Symposium 2017}},
    year  = {2017},
    month  = {01},
    day  = {15},
    location  = {Pheonix, AZ, USA},
    publisher  = {IEEE MTT-S},
    keywords  = {ADC,I/Q signal processing,nonuniform sampling,subsampling},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1843},
    abstract  = {This paper presents a novel receiver using direct complex subsampling. In this approach no frequency conversion is used, but therefore bandpass sampling in combination with nonuniform sampling. A special sampling pattern for the analog to digital conversion is used. The resulting sampling frequency is below the carrier frequency, like in standard bandpass sampling receivers. Therefore the requirements for the analog-digital converter (ADC) and digital signal processor (DSP) are decreased. The sample and hold stage of the ADC still has to meet the requirements for the carrier frequency. The corresponding sampling scheme and its signal processing are described. A simulation of a QPSK receiver is presented. The proposed architecture is validated using a low cost commercial-off-the-shelf (COTS) ADC along with some testing and measurements. The receiver works for the industrial, scientific and medical band (ISM) carrier frequency at 13.56 MHz, which is commonly used for short range devices like radio-frequency identification (RFID) applications.},
    }
  • M. Kloc, R. Weigel, and A. Koelpin, "SDR Implementation of an Adaptive Low-Latency IEEE 802.11p Transmitter System for Real-Time Wireless Applications" in IEEE Radio and Wireless Symposium (RWS), 2017, pp. 1-4 (to be published). [Bibtex]
    @inproceedings{kloc2017,
    author  = {Kloc, Matej and Weigel, Robert and Koelpin, Alexander},
    title  = {SDR Implementation of an Adaptive Low-Latency IEEE 802.11p Transmitter System for Real-Time Wireless Applications},
    booktitle  = {{IEEE Radio and Wireless Symposium (RWS)}},
    year  = {2017},
    month  = {01},
    pages  = {1--4},
    publisher  = {IEEE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1910},
    }
  • [DOI] F. Lurz, S. Lindner, S. Linz, S. Mann, R. Weigel, and A. Koelpin, "High-Speed Resonant Surface Acoustic Wave Instrumentation Based on Instantaneous Frequency Measurement", IEEE Transactions on Instrumentation and Measurement, pp. 1-11, 2017. [Bibtex]
    @article{lurz2017,
    author  = {Lurz, Fabian and Lindner, Stefan and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {High-Speed Resonant Surface Acoustic Wave Instrumentation Based on Instantaneous Frequency Measurement},
    journal  = {{IEEE Transactions on Instrumentation and Measurement}},
    year  = {2017},
    month  = {01},
    pages  = {1--11},
    issn  = {1557-9662},
    doi  = {10.1109/TIM.2016.2642618},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1924},
    abstract  = {Surface acoustic wave (SAW) resonators are used for a broad range of wireless sensing applications, some of them having high demands on the resolution as well as the measurement update rate. This paper presents a new interrogation method for precise and fast frequency determination of passive SAW resonators based on instantaneous frequency measurement (IFM) by a low-cost Six-Port interferometer. By using a delay line, the frequency measurement is reduced to a phase measurement that can be instantaneously evaluated by the Six-Port network. No complex signal processing is necessary providing high update rates and low hardware costs. An in-depth analysis of the system concept and its building blocks is presented and the advantages as well as the limitations are discussed and compared to the current state-of-the-art. Finally, a demonstrator in the 2.4 GHz frequency band shows the feasibility and the precision of the concept with measurement times of only a few microseconds.},
    }
  • P. Gröschel, S. Zarei, C. Carlowitz, M. Lipka, E. Sippel, R. Weigel, R. Schober, and M. Vossiek, "A System Concept for Online Calibration of Massive MIMO Transceiver Arrays", IEEE Transactions on Microwave Theory and Techniques, 2017 (to be published). [Bibtex]
    @article{groeschel2017,
    author  = {Gröschel, Patrick and Zarei, Shahram and Carlowitz, Christian and Lipka, Melanie and Sippel, Erik and Weigel, Robert and Schober, Robert and Vossiek, Martin},
    title  = {A System Concept for Online Calibration of Massive MIMO Transceiver Arrays},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2017},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1864},
    }

2016

  • M. Trautmann, B. Sanftl, R. Weigel, and A. Koelpin, "Frequency Separation Stage Design for a Reliable Data Link in an IPT System for Electric Vehicles" in IEEE Southern Power Electronics Conference (SPEC), 2016 (to be published). [Bibtex]
    @inproceedings{trautmann2016b,
    author  = {Trautmann, Martin and Sanftl, Benedikt and Weigel, Robert and Koelpin, Alexander},
    title  = {Frequency Separation Stage Design for a Reliable Data Link in an IPT System for Electric Vehicles},
    booktitle  = {{IEEE Southern Power Electronics Conference (SPEC)}},
    year  = {2016},
    month  = {12},
    location  = {Auckland, New Zealand},
    publisher  = {IEEE PES},
    volume  = {2},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1819},
    }
  • V. Chauhan, M. Mayer, M. Schiek, C. Huck, M. Pitschi, R. Weigel, and A. Hagelauer, "Nonlinear Behavior of RF Bulk Acoustic Wave Cascaded Components at High Input Power" in IEEE Asia Pacific Microwave Conference, 2016, pp. 1-4 (to be published). [Bibtex]
    @inproceedings{chauhan2016a,
    author  = {Chauhan, Vikrant and Mayer, Markus and Schiek, Maximilian and Huck, Christian and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    title  = {Nonlinear Behavior of RF Bulk Acoustic Wave Cascaded Components at High Input Power},
    booktitle  = {{IEEE Asia Pacific Microwave Conference}},
    year  = {2016},
    month  = {12},
    day  = {07},
    pages  = {1--4},
    location  = {New Delhi, India},
    publisher  = {IEEE MTT-S},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1920},
    }
  • V. Silva, R. Weigel, G. Fischer, and A. Hagelauer, "High Power Effects on a MEMS-based Tunable Matching Network for Power Amplifier Reconfigurability" in Latin America Microwave Conference 2016, 2016 (to be published). [Bibtex]
    @inproceedings{silva2016b,
    author  = {Silva, Victor and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    title  = {High Power Effects on a MEMS-based Tunable Matching Network for Power Amplifier Reconfigurability},
    booktitle  = {{Latin America Microwave Conference 2016}},
    year  = {2016},
    month  = {12},
    location  = {Puerto Vallarta, Mexico},
    publisher  = {IEEE MTT-S},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1911},
    abstract  = {In this work, the thermal effects on a tunable matching network (TMN) based on micro electro mechanical system (MEMS) are investigated. A capacitive MEMS switch acts as the active component in a TMN that provides reconfigurability on the PA architecture. However, the large signal operation of the PA causes the membrane of the MEMS switch to heat up, leading to variations of its intrinsic characteristics. These effects are modeled and their influence on the linearity of the PA addressed. The study is aided by a behavioral model of the capacitive MEMS switch with the additional modeling of the thermal effects that raise due to power dissipation at the MEMS’s membrane. The PA architecture is based on a commercial process design kit for the PA and the geometrical and material characteristics of an available MEMS switch.},
    }
  • D. Shuklin, D. Hohnloser, T. Lieske, M. Reichenbach, A. Bänisch, B. Pfundt, J. Röber, R. Weigel, and D. Fey, "Systemkonzept eines autarken und intelligenten Miniatur-Sensors für Smart Home" in VDE Kongress 2016: Internet der Dinge, 2016 (to be published). [Bibtex]
    @inproceedings{shuklin2016,
    author  = {Shuklin, Denis and Hohnloser, Daniel and Lieske, Tobias and Reichenbach, Marc and Bänisch, Andreas and Pfundt, Benjamin and Röber, Jürgen and Weigel, Robert and Fey, Dietmar},
    title  = {Systemkonzept eines autarken und intelligenten Miniatur-Sensors für Smart Home},
    booktitle  = {{VDE Kongress 2016: Internet der Dinge}},
    year  = {2016},
    month  = {11},
    keywords  = {Smart Home,Intelligent Sensor System,MEMS Sensor,Analog to Digital Converter,Digital Processing Unit},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1800},
    abstract  = {Trotz der erheblichen Fortschritte im Bereich Smart Home, stellt die Installation von Hunderten von Sensoren eine der größten Herausforderungen dar. Eine mögliche Lösung für dieses Problem ist die Integration aller Komponenten innerhalb einer integrierten Schaltung. Dieser Beitrag stellt ein Konzept für ein intelligentes Sensorsystem dar, welches die wichtigsten Sensoren für das intelligente Zuhause (wie z.B. Drucksensor, Gassensor, Temperatur-, oder Lichtsensor) auf einem Chip vereint. Dadurch wird das Messen von lokalen Temperaturen, Lichtverhältnissen, Drucks und sogar Luftqualität ermöglicht. Mit diesen umfassenden Informationen können lebensunterstützende Systeme, Einbruchsdetektion, automatisierte Klimaregelung und Beleuchtungssteuerung in Räumen und vieles mehr realisiert werden. Langfristiges Ziel dieser Arbeit ist die Entwicklung eines selbst organisierenden und autonomen Netzwerks von intelligenten Sensoren im Bereich Smart Home. Mit Abmessungen von wenigen Zentimetern, kann jeder Sensor nahezu überall angebracht werden, wie zum Beispiel an einem Fenster.},
    }
  • M. Dietz, G. Guarin, M. Hofmann, I. Nasr, J. Nehring, B. Lämmle, A. Schwarzmeier, K. Aufinger, A. Hagelauer, G. Fischer, R. Weigel, and D. Kissinger, "Wearables with integrated Microwave-Sensors for Internet-of-Things-Applications (IoT) in the sector of health-care: An overview" in VDE Kongress 2016: Internet der Dinge, 2016, pp. 1-6 (to be published). [Bibtex]
    @inproceedings{dietz2016a,
    author  = {Dietz, Marco and Guarin, Gustavo and Hofmann, Maximilian and Nasr, Ismail and Nehring, Johannes and Lämmle, Benjamin and Schwarzmeier, Andre and Aufinger, Klaus and Hagelauer, Amelie and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Wearables with integrated Microwave-Sensors for Internet-of-Things-Applications (IoT) in the sector of health-care: An overview},
    booktitle  = {{VDE Kongress 2016: Internet der Dinge}},
    year  = {2016},
    month  = {11},
    pages  = {1--6},
    location  = {Mannheim},
    publisher  = {VDE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1850},
    }
  • [DOI] S. Linz, F. Oesterle, S. Lindner, S. Mann, R. Weigel, and A. Koelpin, "Test Method for Contactless On-wafer MEMS Characterization and Production Monitoring", IEEE Transactions on Microwave Theory and Techniques, vol. 64, iss. 11, pp. 3918-3926, 2016. [Bibtex]
    @article{linz2016,
    author  = {Linz, Sarah and Oesterle, Florian and Lindner, Stefan and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Test Method for Contactless On-wafer MEMS Characterization and Production Monitoring},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2016},
    month  = {11},
    pages  = {3918--3926},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2016.2612664},
    publisher  = {IEEE},
    volume  = {64},
    number  = {11},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1808},
    }
  • M. Kloc, R. Weigel, and A. Koelpin, "Enhancing the Real-Time Performance of a Wireless Hardware-in-the-Loop Test System in ISM Bands" in IEEE Advances in Wireless and Optical Communications (RTUWO), 2016, pp. 1-6 (to be published). [Bibtex]
    @inproceedings{kloc2016c,
    author  = {Kloc, Matej and Weigel, Robert and Koelpin, Alexander},
    title  = {Enhancing the Real-Time Performance of a Wireless Hardware-in-the-Loop Test System in ISM Bands},
    booktitle  = {{IEEE Advances in Wireless and Optical Communications (RTUWO)}},
    year  = {2016},
    month  = {11},
    pages  = {1--6},
    publisher  = {IEEE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1892},
    }
  • B. Sanftl, T. Magel, M. Trautmann, R. Weigel, and A. Koelpin, "A Robust Light-Weight Protocol Stack for Data Transmission within Inductive Power Transfer Systems" in ApMediaCast2016 Asia Pacific Conference on Multimedia and Broadcasting, 2016 (to be published). [Bibtex]
    @inproceedings{sanftl2016c,
    author  = {Sanftl, Benedikt and Magel, Thomas and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {A Robust Light-Weight Protocol Stack for Data Transmission within Inductive Power Transfer Systems},
    booktitle  = {{ApMediaCast2016 Asia Pacific Conference on Multimedia and Broadcasting}},
    year  = {2016},
    month  = {11},
    day  = {16},
    location  = {Kuta, Bali, Indonesia},
    publisher  = {IEEE ComSoc},
    keywords  = {IPT,Inductive Data Communication,protocol design,wireless communication,signal processing},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1887},
    }
  • [DOI] J. Nehring, M. Schütz, I. Nasr, K. Aufinger, R. Weigel, and D. Kissinger, "Highly Integrated 4-32GHz Two-Port Vector Network Analyzers for Instrumentation and Biomedical Applications", IEEE Transactions on Microwave Theory and Techniques, 2016. [Bibtex]
    @article{nehring2016a,
    author  = {Nehring, Johannes and Schütz, Martin and Nasr, Ismail and Aufinger, Klaus and Weigel, Robert and Kissinger, Dietmar},
    title  = {Highly Integrated 4-32GHz Two-Port Vector Network Analyzers for Instrumentation and Biomedical Applications},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2016},
    month  = {11},
    day  = {01},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2016.2616873},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1812},
    }
  • S. Wibbing, S. Mann, F. Lurz, M. Frank, R. Weigel, and A. Koelpin, "Radarbasierte und vernetzte Umfeldsensorik zur autonomen Steuerung von Industrierobotern" in VDE Kongress 2016: Internet der Dinge, 2016, pp. 1-6. [Bibtex]
    @inproceedings{wibbing2016b,
    author  = {Wibbing, Sascha and Mann, Sebastian and Lurz, Fabian and Frank, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {Radarbasierte und vernetzte Umfeldsensorik zur autonomen Steuerung von Industrierobotern},
    booktitle  = {{VDE Kongress 2016: Internet der Dinge}},
    year  = {2016},
    month  = {11},
    pages  = {1--6},
    location  = {Mannheim, Germany},
    publisher  = {VDE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1834},
    abstract  = {Im Zuge der so genannten vierten industriellen Revolution, kurz Industrie 4.0 genannten Initiative der Bundesregierung ist ein Hauptmerkmal die dynamische Anpassung von bislang unflexiblen Produktionseinrichtungen auf sich wechselnde Anforderungen und Umgebungsfaktoren. Besonders in Bezug auf autonom agierende Systeme wie beispielsweise Industrieroboter werden zur Realisierung solcher Anforderungen vor allem leistungsfähige Sensoren und Steuerungen benötigt. In diesem Artikel wird ein vernetztes Sensorsystem bestehend aus mehreren RADAR-Sensoren beschrieben, welche durch mehrdimensionale Sensordatenfusion ein 3D-Bild der Umgebung erstellen. Zur Vernetzung werden dabei vor allem bestehende und etablierte Netzwerktechniken zur Datenübertragung verwendet. Die Systemarchitektur und die Komponenten eines einzelnen Sensorknotens sowie der zentralen Steuereinheit werden im Detail erörtert. Im Anschluss daran werden verschiedene Messungen hinsichtlich Performanz und Auflösung präsentiert und erläutert.},
    }
  • D. Fey, M. Reichenbach, C. Söll, J. Röber, and R. Weigel, "Using Memristor Technology for Multi-value Registers in Signed-digit Arithmetic Circuits" in IEEE The International Symposium on Memory Systems (MEMSYS), 2016. [Bibtex]
    @inproceedings{fey2016a,
    author  = {Fey, Dietmar and Reichenbach, Marc and Söll, Christopher and Röber, Jürgen and Weigel, Robert},
    title  = {Using Memristor Technology for Multi-value Registers in Signed-digit Arithmetic Circuits},
    booktitle  = {{IEEE The International Symposium on Memory Systems (MEMSYS)}},
    year  = {2016},
    month  = {10},
    location  = {Washington, USA},
    publisher  = {Association for Computing Machinery},
    keywords  = {Signed-digit arithmetic multi-bit memristors memristive computing,multi-bit memristors,memristive computing,GRK},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1809},
    abstract  = {Signed-digit (SD) arithmetic exploits positive and negative digits what requires more than two states. It is long known that using trits, which store in each digit not only 0 and 1 but in addition either 2 or -1, can carry out an addition in a constant number of steps independent of the used operands' word length. However, corresponding SD arithmetic circuits have not been used in current processors so far due to the missing of fast, dense and CMOS compatible memory cells that can store reliably multiple levels. Memristors offer these features making necessary a re-evaluation of different SD number representations and their corresponding arithmetic circuits realized in CMOS technology. In addition appropriate analog-to-digital and digital-to-analog interfaces between digital CMOS circuits and multi-bit storing memristors are necessary and therefore are considered in this investigation, too. The paper evaluates different SD adders which differ both in the number of used storing levels, in the number of required CMOS logic gates, and in the number of necessary elementary computation steps. It is concluded by an synthesis investigation that an SD addition using trits, stored in memristors, and three elementary processing steps reduces the latency for a word length of 16 digits about 19\% and about 52\% for a word length of 512 digits compared to a binary carry-look-ahead (CLA) adder. Furthermore, it is shown that for double and long format operands stored in register based memristors a better energy-delay product is achieved as in a CLA adder. The results are partially found from ascertained chip layouts of hybrid CMOS / memristor circuits, which combine CMOS logic and multi-level storage devices like memristors in one integrated circuit.},
    }
  • S. Senega, J. Röber, A. Nassar, R. Weigel, C. Heuer, and S. Lindenmeier, "Compact Scan-Phase Antenna Diversity Related System Considerations" in European Microwave Week, 2016, p. 4 (to be published). [Bibtex]
    @inproceedings{senega2016,
    author  = {Senega, Simon and Röber, Jürgen and Nassar, Ali and Weigel, Robert and Heuer, Christian and Lindenmeier, Stefan},
    title  = {Compact Scan-Phase Antenna Diversity Related System Considerations},
    booktitle  = {{European Microwave Week}},
    year  = {2016},
    month  = {10},
    pages  = {4},
    location  = {London},
    publisher  = {IEEE},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1839},
    abstract  = {An integrated antenna diversity system is described which enables a high increase of reception performance for satellite digital audio radio services (SDARS). A detailed analysis is given for the gain and noise figure requirements specifically regarding the implementation in an integrated circuit. In this contribution a compact integrated diversity system is specified and its realization is described. Also sufficient immunity to high level interferers must be ensured which can be in close proximity as far as frequency distance is concerned. On base of the specified values the system provides an overall gain of 26.8 dB with a noise figure of 0.84 dB including the single rf cable connecting the diversity antenna set to the unmodified standard SDARS receiver. A hardware demonstrator of our scan-phase antenna diversity system is presented in which the phase aligned rf combining and signal selection is implemented in a compact IC with a package size of only 8mm by 8 mm. Measurement results with recorded Rayleigh fading signals from a test drive in the US with a duration of 290 s show a reduction of audio mutes from 29.8 s of the best single antenna to only 4.1 s with our scan-phase antenna diversity demonstrator.},
    }
  • A. Talai, "BROADBAND CHARACTERIZATION OF LAUNCHERS AND TRANSITIONS", pp. 1-4, 2016. [Bibtex]
    @other{talai2016b,
    author  = {Talai, Armin},
    title  = {BROADBAND CHARACTERIZATION OF LAUNCHERS AND TRANSITIONS},
    booktitle  = {{CST APPLICATION ARTICLE}},
    year  = {2016},
    month  = {10},
    pages  = {1--4},
    publisher  = {CST – Computer Simulation Technology AG, Bad Nauheimer Str. 19, 64289 Darmstadt, Germany},
    keywords  = {Launchers,Transitions,Material Characterization,Surface Roughness},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1919},
    abstract  = {Characterizing material properties with a high degree of precision requires very accurate sensors, which means that the properties of the sensor itself must also be accurately characterized. Simulation allows the properties of elements of the test equipment to be calculated in isolation or be integrated into the simulation model for the test set-up, and allows the design of the sensor to be optimized. This article will demonstrate how CST® STUDIO SUITE® was used to simulate and optimize a coaxial-microstrip transition for a material characterization measurement system, including the effect of the probes themselves, and analyze the effect of surface roughness on the properties of the sensor.},
    }
  • C. Erhart, S. Lutz, T. Walter, H. Mantz, P. Hügler, and R. Weigel, "Design and Demonstration of a Full Polarimetric Sensor for Surface Texture Chracteroisation" in European Microwave Conference, 2016, pp. 1-4. [Bibtex]
    @inproceedings{erhart2016,
    author  = {Erhart, Christian and Lutz, Steffen and Walter, Thomas and Mantz, Hubert and Hügler, Philipp and Weigel, Robert},
    title  = {Design and Demonstration of a Full Polarimetric Sensor for Surface Texture Chracteroisation},
    booktitle  = {{European Microwave Conference}},
    year  = {2016},
    month  = {10},
    pages  = {1--4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1894},
    }
  • [DOI] M. Kloc, R. Weigel, and A. Koelpin, "Making Real-Time Hardware-in-the-Loop Testing of Automotive Electronic Control Units Wireless" in Advanced Technologies for Communications (ATC), 2016, pp. 407-412. [Bibtex]
    @inproceedings{kloc2016b,
    author  = {Kloc, Matej and Weigel, Robert and Koelpin, Alexander},
    title  = {Making Real-Time Hardware-in-the-Loop Testing of Automotive Electronic Control Units Wireless},
    booktitle  = {{Advanced Technologies for Communications (ATC)}},
    year  = {2016},
    month  = {10},
    pages  = {407--412},
    doi  = {10.1109/ATC.2016.7764816},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1851},
    }
  • [DOI] D. Hohnloser, D. Shuklin, C. Schmidt, M. Kreitmaier, M. Blasini, A. Hagelauer, and R. Weigel, "Feasibility Analysis of a Novel Production Method for Monolithic Integrated MEMS with Nanogaps" in IEEE Sensors, 2016, pp. 1-3. [Bibtex]
    @inproceedings{hohnloser2016,
    author  = {Hohnloser, Daniel and Shuklin, Denis and Schmidt, Carsten and Kreitmaier, Michael and Blasini, Mario and Hagelauer, Amelie and Weigel, Robert},
    title  = {Feasibility Analysis of a Novel Production Method for Monolithic Integrated MEMS with Nanogaps},
    booktitle  = {{IEEE Sensors}},
    year  = {2016},
    month  = {10},
    pages  = {1--3},
    doi  = {10.1109/ICSENS.2016.7808655},
    location  = {Orlando},
    publisher  = {IEEE},
    keywords  = {MEMS},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1845},
    abstract  = {This paper analyses a novel production technique for the fabrication of microelectromechanical system (MEMS) with a gap in the scale of nanometer. The technology is based on a density-changing layer, which let a gap arise through the shrinkage of this layer. After the description of the technology, the requirements for monolithic integration and CMOS compatibility with respect to this technology are worked out. It has been discovered that there are several challenges to be overcome, especially to find a material composition which match the requirements will be important as well as to set up the process without affecting other CMOS device parameters. But if these challenges are solved the process will be suitable for various applications and enable to open up new markets.},
    }
  • [DOI] S. Lindner, R. Weigel, and A. Koelpin, "A low-cost laser barrier based vectorial velocity measurement system" in 2016 IEEE SENSORS Proceedings, 2016, pp. 289-291. [Bibtex]
    @inproceedings{lindner2016,
    author  = {Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {A low-cost laser barrier based vectorial velocity measurement system},
    booktitle  = {{2016 IEEE SENSORS Proceedings}},
    year  = {2016},
    month  = {10},
    day  = {30},
    pages  = {289--291},
    isbn  = {978-1-4799-8287-5},
    doi  = {10.1109/ICSENS.2016.7808494},
    location  = {Orlando, FL, USA},
    publisher  = {IEEE},
    keywords  = {angle of arrival,velocity measurement,laser barrier,crossed laser,table soccer},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1823},
    abstract  = {This paper describes a low-cost measurement system based on two crossed laser barriers to measure the angle, the position as well as the velocity of an object with known shape, which is passing the measurement system. Due to the simple system setup this leads to a low-cost vectorial speed measurement system, which is capable of high speed measurements. Furthermore, as a demonstrator, a table soccer ball speed measurement system will be presented, which shows the feasibility of the proposed system.},
    }
  • L. Shi, J. Maier, C. Söll, J. Röber, M. Berger, B. Bier, R. Fahrig, B. Eskofier, and A. Maier, "Analog Non-Linear Transformation-Based Tone Mapping for Image Enhancement in C-arm CT" in IEEE Medical Imaging Conference (MIC), 2016 (to be published). [Bibtex]
    @inproceedings{shi2016a,
    author  = {Shi, Lan and Maier, Jennifer and Söll, Christopher and Röber, Jürgen and Berger, Martin and Bier, Bastian and Fahrig, Rebecca and Eskofier, Björn and Maier, Andreas},
    title  = {Analog Non-Linear Transformation-Based Tone Mapping for Image Enhancement in C-arm CT},
    booktitle  = {{IEEE Medical Imaging Conference (MIC)}},
    year  = {2016},
    month  = {10},
    day  = {29},
    location  = {Strasbourg, France},
    keywords  = {GRK-1773},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1835},
    abstract  = {Flat-Panel C-arm Computed Tomography (CT) suffers from pixel saturation due to the detector’s limited dynamic range. We describe a novel approach to analog, non-linear tone mapping (TM) for preventing detector saturation. An analog TM operator (TMO) applies a non-linear transformation in a CMOS sensor and its inverse TMO based on 14-bit digital raw data. This is done in order to prevent overexposure and to enhance image quality to 32 bits. The method was applied to the cases of low-contrast head imaging and to that of imaging both knees. Cone-beam projection data with and without overexposure was simulated for a 200° short-scan of the knees and a 360° full-scan of a Forbild head phantom. The results show an increased correlation coefficient of 0.99 compared to 0.96 for overexposed knee data and a higher low-contrast visibility (CC=0.99) compared to linear quantization (CC=0.97).},
    }
  • [DOI] J. Kirchner, N. Roth, A. Meyer, and G. Fischer, "ECG Measurement by Use of Passive Capacitively Coupled Electrodes" in Proc. IEEE Sensors Conf., 2016. [Bibtex]
    @inproceedings{kirchner2016,
    author  = {Kirchner, Jens and Roth, Nils and Meyer, Andreas and Fischer, Georg},
    title  = {ECG Measurement by Use of Passive Capacitively Coupled Electrodes},
    booktitle  = {{Proc. IEEE Sensors Conf.}},
    year  = {2016},
    month  = {10},
    doi  = {10.1109/ICSENS.2016.7808736},
    keywords  = {electrocardiogram,ECG,capacitive electrodes,passive channel,chronic disease monitoring},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1862},
    abstract  = {The prototype of a capacitive ECG measurement device with purely passive signal transmission between electrodes and differential amplifier is presented. This design is intended to improve transmission symmetry and thus common-mode rejection. The feasibility of the approach is demonstrated by measurements with different materials between body surface and electrodes. The ECG module shall be incorporated in a mobile sensor platform in the form of a plaster for the monitoring of chronic diseases.},
    }
  • C. Söll, T. Mai, L. Shi, J. Röber, T. Ußmüller, R. Weigel, and A. Hagelauer, "Low-Power High-Gain Operational Amplifier for Analog Image Pre-Processing in Smart Sensor Systems" in 15. ITG/GMM-Fachtagung Analog 2016, 2016, pp. 28-32. [Bibtex]
    @inproceedings{soell2016c,
    author  = {Söll, Christopher and Mai, Timo and Shi, Lan and Röber, Jürgen and Ußmüller, Thomas and Weigel, Robert and Hagelauer, Amelie},
    title  = {Low-Power High-Gain Operational Amplifier for Analog Image Pre-Processing in Smart Sensor Systems},
    booktitle  = {{15. ITG/GMM-Fachtagung Analog 2016}},
    year  = {2016},
    month  = {09},
    pages  = {28--32},
    isbn  = {978-3-8007-4265-3},
    location  = {Bremen},
    keywords  = {analog pre-processing,operational amplifier,low-power,high-gain,folded-cascode,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1813},
    abstract  = {In this work, a low-power high-gain operational amplifier is presented, which is dedicated to work in an analog image pre-processing stage in a smart sensor system. This stage is able to detect edges and shapes for instance, before the image is passed to the ADC and the digital computation stage, reducing data and precision requirement of both stages. This approach helps to save power, making smart image sensor nodes with energy harvesting reasonable. Since the precision as well as the energy consumption of the edge detection algorithm is highly depended on the amplifier used for the basic summing and multiplier blocks, the design of it plays an important role for the approach. The proposed input/output rail-to-rail operational amplifier is based on a 150 nm CMOS process, has a gain of 77 dB and a unity gain bandwidth of 45.7MHz while consuming only 77 μA statically at a supply voltage of 1.8V.},
    }
  • Y. Can, H. Kassim, and G. Fischer, "Orthogonalization of DNF in TVL-Arithmetic" in 12th International Workshop of Boolean Problems, 2016. [Bibtex]
    @inproceedings{can2016,
    author  = {Can, Yavuz and Kassim, Hassen and Fischer, Georg},
    title  = {Orthogonalization of DNF in TVL-Arithmetic},
    booktitle  = {{12th International Workshop of Boolean Problems}},
    year  = {2016},
    month  = {09},
    location  = {12th International Workshop of Boolean Problems},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1840},
    }
  • [DOI] V. Issakov, M. Wojnowski, H. Knapp, S. Trotta, H. Forstner, K. Pressel, and A. Hagelauer, "Co-simulation and Co-design of Chip-Package-Board Interfaces in Highly-Integrated RF Systems" in IEEE Bipolar / BiCMOS Circuits and Technology Meeting 2016, 2016, pp. 94-101. [Bibtex]
    @inproceedings{issakov2016,
    author  = {Issakov, Vadim and Wojnowski, Maciej and Knapp, Herbert and Trotta, Saverio and Forstner, Hans-Peter and Pressel, Klaus and Hagelauer, Amelie},
    title  = {Co-simulation and Co-design of Chip-Package-Board Interfaces in Highly-Integrated RF Systems},
    booktitle  = {{IEEE Bipolar / BiCMOS Circuits and Technology Meeting 2016}},
    year  = {2016},
    month  = {09},
    pages  = {94--101},
    issn  = {2378-590X},
    doi  = {10.1109/BCTM.2016.7738959},
    location  = {New Brunswick, NJ},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1846},
    abstract  = {The level of integration for RF and mm-wave systems is continuously increasing. Highly-integrated system on chip solutions have to be encapsulated in a package and assembled on a board. In addition, to be more attractive as a product, the trend goes towards further integration of passives and antennas in a package. This drives the system in package solutions. However, electrical properties of the package and board may have a significant effect on system parameters, especially at high frequencies. Hence, layout features of package and board must be carefully modelled and considered during the design. Furthermore, it is often insufficient to model chip, package and board separately, as some high-frequency effects may not be captured. An example is electromagnetic coupling between integrated coils on chip and routing traces in package. In this paper we describe considerations on co-simulation and co-design of highlyintegrated RF systems by means of accurate electromagnetic modelling. We demonstrate the approach and various aspects of chip-package-board co-design based on examples of systems for various applications: 6 GHz VCO using embedded inductor; backhaul communication system in package for V-band and Eband and a four-channel 77 GHz automotive radar transceiver in a package with four dipole antennas.},
    }
  • P. Kindt, D. Yunge, A. Tobola, G. Fischer, and S. Chakraborty, "Dynamic Service Switching for the Medical Internet of Things" in IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2016 (to be published). [Bibtex]
    @inproceedings{kindt2016,
    author  = {Kindt, Philipp and Yunge, Daniel and Tobola, Andreas and Fischer, Georg and Chakraborty, Samarjit},
    title  = {Dynamic Service Switching for the Medical Internet of Things},
    booktitle  = {{IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)}},
    year  = {2016},
    month  = {09},
    location  = {Valencia, Spain},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1821},
    }
  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, "A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation" in Kleinheubacher Tagung, 2016. [Bibtex]
    @inproceedings{will2016a,
    author  = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2016},
    month  = {09},
    location  = {Miltenberg, Germany},
    publisher  = {URSI},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1830},
    abstract  = {Precise position measurement with micrometer accuracy plays an important role in modern industrial applications. Herewith, a guided wave Six-Port interferometric radar system is presented. Due to limited matching and discontinuities in the radio frequency (RF) part of the system, the designers have to deal with DC offsets. The offset voltages in the baseband lead to worse relative modulation dynamics relating to the full scale range of the analog-to-digital converters and thus, considerably degrade the system performance. While common cancelation techniques try to estimate and extinguish the DC offsets directly, the proposed radar system is satisfied with equalizing both DC offsets for each of the two differential baseband signal pairs. Since the complex representation of the baseband signals is utilized for a subsequent arctangent demodulation, the proposed offset equalization implicates a centering of the in-phase and quadrature (I/Q) components of the received signal, which is sufficient to simplify the demodulation and improve the phase accuracy. Therefore, a standard Six-Port radar system is extended and a variable phase shifter plus variable attenuators are inserted at different positions. An intelligent algorithm adjusts these configurable components to achieve optimal I/Q offset cancelation.},
    }
  • J. Kirchner, J. Nehring, G. Guarin, I. Nasr, B. Lämmle, M. Dietz, R. Weigel, D. Kissinger, and A. Hagelauer, "SiGe Integrated Broadband Wireless Sensors for Biomedical Applications" in 9th Sin-German Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC2016), 2016, pp. 77-78. [Bibtex]
    @inproceedings{kirchner2016a,
    author  = {Kirchner, Jens and Nehring, Johannes and Guarin, Gustavo and Nasr, Ismail and Lämmle, Benjamin and Dietz, Marco and Weigel, Robert and Kissinger, Dietmar and Hagelauer, Amelie},
    title  = {SiGe Integrated Broadband Wireless Sensors for Biomedical Applications},
    booktitle  = {{9th Sin-German Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC2016)}},
    year  = {2016},
    month  = {09},
    day  = {28},
    pages  = {77--78},
    location  = {Changchun},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1926},
    }
  • [DOI] G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid recursive active filters for duplexing in RF transmitter front-ends", Radio Science, 2016. [Bibtex]
    @article{gottardo2016a,
    author  = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    title  = {Hybrid recursive active filters for duplexing in RF transmitter front-ends},
    journal  = {{Radio Science}},
    year  = {2016},
    month  = {09},
    doi  = {10.1002/2016RS005969},
    publisher  = {AGU Publications},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1847},
    abstract  = {Duplex filters in modern base transceiver stations shape the channel in order to perform common frequency division duplex operations. Usually, they are designed as cavity filters, which are expensive and have large dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power. This solution provides the shaping of the signal spectrum directly at the output of the radio frequency (RF) power amplifiers (PAs) relaxing the transmitter design especially in the duplexer and in the antenna sections. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. A model to describe the hybrid system is investigated, and the relation between phase and resonance peaks of the resulting periodic band-pass transfer function is described. The stability condition of the system is analyzed using Nyquist criterion. A solution involving a number of digital feedback and forward branches is investigated defining the parameters of the recursive structure. This solution allows the closed loop system to show a periodic band pass with up to 500 kHz bandwidth at the output of the RF amplifier. The band-pass magnitude reaches up to 17 dB selectivity. The rejection of the PA noise in the out-of-band frequencies is verified by measurements. The filter is tested with a modulated LTE (Long Term Evolution) signal showing an ACPR (Adjacent Channel Power Ratio) enhancement of 10 dB of the transmitted signal.},
    }
  • [DOI] V. Chauhan, A. Tag, M. Mayer, R. Weigel, and A. Hagelauer, "Modeling Nonlinear Behavior of RF Bulk Acoustic Wave Resonators" in IEEE International Ultrasonics Symposium, 2016, pp. 1-4. [Bibtex]
    @inproceedings{chauhan2016,
    author  = {Chauhan, Vikrant and Tag, Andreas and Mayer, Markus and Weigel, Robert and Hagelauer, Amelie},
    title  = {Modeling Nonlinear Behavior of RF Bulk Acoustic Wave Resonators},
    booktitle  = {{IEEE International Ultrasonics Symposium}},
    year  = {2016},
    month  = {09},
    pages  = {1--4},
    doi  = {10.1109/ULTSYM.2016.7728406},
    location  = {Tours, France},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1880},
    }
  • [DOI] R. Weigel, F. Lurz, S. Lindner, S. Mann, S. Linz, and A. Koelpin, "A Fast and Precise Six-Port-based IFM Techniquefor Wireless Resonant SAW Sensing" in IEEE International Ultrasonics Symposium, 2016, pp. 1-4. [Bibtex]
    @inproceedings{weigel2016a,
    author  = {Weigel, Robert and Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Koelpin, Alexander},
    title  = {A Fast and Precise Six-Port-based IFM Techniquefor Wireless Resonant SAW Sensing},
    booktitle  = {{IEEE International Ultrasonics Symposium}},
    year  = {2016},
    month  = {09},
    pages  = {1--4},
    issn  = {1948-5727},
    doi  = {10.1109/ULTSYM.2016.7728613},
    location  = {Tours, France},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1896},
    }
  • [DOI] C. Söll, L. Shi, J. Röber, M. Reichenbach, R. Weigel, and A. Hagelauer, "Low-Power Analog Smart Camera Sensor for Edge Detection" in IEEE International Conference on Image Processing (ICIP), 2016. [Bibtex]
    @inproceedings{soell2016,
    author  = {Söll, Christopher and Shi, Lan and Röber, Jürgen and Reichenbach, Marc and Weigel, Robert and Hagelauer, Amelie},
    title  = {Low-Power Analog Smart Camera Sensor for Edge Detection},
    booktitle  = {{IEEE International Conference on Image Processing (ICIP)}},
    year  = {2016},
    month  = {09},
    doi  = {10.1109/ICIP.2016.7533193},
    location  = {Phoenix, USA},
    keywords  = {Smart Camera,CMOS Image Sensor,Analog Processing Circuits,Analog Sobel,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1772},
    abstract  = {This work presents an intelligent analog image sensor system for smart camera applications with the need of edge or marker detection. The system consists of a 3x3 read-out CMOS image sensor, an analog Sobel stage and additional circuitry like operational amplifiers and comparators to compute a 1bit image with the edges present in the taken photo. This information can then be further processed digitally to detect specific shapes in order to control robot routines, for example. The architecture of the proposed system is highly desirable as dedicated analog hardware has significant advantages in terms of power and speed compared to digital implementations. The overall system is simulated with the help of a 3x3 CMOS image sensor IC as well as Cadence Virtuoso for analog circuit simulation and MATLAB to convert the sequential information back to an image, and compared to other state of the art CMOS image sensors with edge detection capability. The analog Sobel circuit runs with a clock of 10MHz and consumes less than 0.79mW average power for the computation of the example image, and the whole 200x200 pixel image sensor consumes only 5.5mW at a frame rate of 75 fps.},
    }
  • [DOI] V. Silva, V. Chauhan, R. Weigel, G. Fischer, and A. Hagelauer, "Nonlinear BAW Filter Effects on the Performance of an LTE Receiver" in IEEE International Ultrasonics Symposium, 2016, pp. 1-4. [Bibtex]
    @inproceedings{silva2016a,
    author  = {Silva, Victor and Chauhan, Vikrant and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    title  = {Nonlinear BAW Filter Effects on the Performance of an LTE Receiver},
    booktitle  = {{IEEE International Ultrasonics Symposium}},
    year  = {2016},
    month  = {09},
    pages  = {1--4},
    issn  = {1948-5727},
    doi  = {10.1109/ULTSYM.2016.7728397},
    location  = {Tours, France},
    publisher  = {International Ultrasonics Symposium},
    keywords  = {RF frontend,BAW,Nonlinear modeling},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1832},
    abstract  = {In this work, the impact of the intrinsic nonlinear effects of BAW filters in the demodulation performance of an LTE receiver is evaluated. The nonlinear effects that shape the generation of higher harmonics in the BAW resonator are covered in a nonlinear model implemented in Keysight ADS and validated through nonlinear measurements done on a BAW resonator for its 2nd harmonic. The nonlinear filter characteristics and its power dependence are captured in a Poly Harmonic Distortion (PHD) model and used for the simulation of the LTE receiver.},
    }
  • [DOI] A. Koelpin, F. Lurz, S. Linz, S. Mann, C. Will, and S. Lindner, "Six-Port Based Interferometry for Precise Radar and Sensing Application", Sensors, vol. 16, iss. 10, pp. 1-26, 2016. [Bibtex]
    @article{koelpin2016,
    author  = {Koelpin, Alexander and Lurz, Fabian and Linz, Sarah and Mann, Sebastian and Will, Christoph and Lindner, Stefan},
    title  = {Six-Port Based Interferometry for Precise Radar and Sensing Application},
    journal  = {{Sensors}},
    year  = {2016},
    month  = {09},
    day  = {22},
    pages  = {1--26},
    issn  = {1424-8220},
    doi  = {10.3390/s16101556},
    publisher  = {MDPI},
    volume  = {16},
    number  = {10},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1908},
    }
  • A. El Assaad, M. Krug, and G. Fischer, "Highly Accurate Distance Estimation Using Spatial Filtering and GNSS in Urban Environments" in Vehicular Technology Conference-VTC2016-Fall, 2016 (to be published). [Bibtex]
    @inproceedings{assaad2016c,
    author  = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    title  = {Highly Accurate Distance Estimation Using Spatial Filtering and GNSS in Urban Environments},
    booktitle  = {{Vehicular Technology Conference-VTC2016-Fall}},
    year  = {2016},
    month  = {09},
    location  = {Montreal, Canada},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1820},
    }
  • [DOI] A. Tag, V. Chauhan, C. Huck, B. Bader, D. Karolewski, M. Pitschi, R. Weigel, and A. Hagelauer, "A Method for Accurate Modeling of BAW Filters at High Power Levels", IEEE Transactions on Ultrasonics, Ferroelecrtrics, and Frequency Control, vol. 63, iss. 8, pp. 1-8, 2016. [Bibtex]
    @article{tag2016,
    author  = {Tag, Andreas and Chauhan, Vikrant and Huck, Christian and Bader, Bernhard and Karolewski, Dominik and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    title  = {A Method for Accurate Modeling of BAW Filters at High Power Levels},
    journal  = {{IEEE Transactions on Ultrasonics, Ferroelecrtrics, and Frequency Control}},
    year  = {2016},
    month  = {08},
    pages  = {1--8},
    issn  = {0885-3010},
    doi  = {10.1109/TUFFC.2016.2615109},
    publisher  = {IEEE},
    volume  = {63},
    number  = {8},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1871},
    }
  • M. Hierold, B. Cassens, S. Ripperger, F. Mayer, R. Weigel, and A. Koelpin, "Enabling encounter detection for small vertebrates - dynamically reconfigurable sensor nodes for BATS" in International Bat Research Conference, 2016. [Bibtex]
    @inproceedings{hierold2016b,
    author  = {Hierold, Martin and Cassens, Björn and Ripperger, Simon and Mayer, Frieder and Weigel, Robert and Koelpin, Alexander},
    title  = {Enabling encounter detection for small vertebrates - dynamically reconfigurable sensor nodes for BATS},
    booktitle  = {{International Bat Research Conference}},
    year  = {2016},
    month  = {08},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1878},
    }
  • A. Talai, G. Gold, M. Frank, S. Mann, R. Weigel, and A. Koelpin, "A Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor for Bulk and Metallized Dielectrics", Frequenz, pp. 1-9, 2016 (to be published). [Bibtex]
    @article{talai2016a,
    author  = {Talai, Armin and Gold, Gerald and Frank, Martin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {A Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor for Bulk and Metallized Dielectrics},
    journal  = {{Frequenz}},
    year  = {2016},
    month  = {07},
    pages  = {1--9},
    publisher  = {DE GRUYTER},
    keywords  = {Complex Permittivity,Coplanar Waveguide,Material Characterization,Surface Roughness},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1827},
    abstract  = {Microwave Materials such as Rogers RO3003 are subject to process-related fluctuations in terms of the relative permittivity and dielectric loss. The behavior of high frequency circuits like patch-antenna arrays and their distribution networks is dependent on the effective wavelength. Therefore, fluctuations of the complex permittivity will influence the resonance frequency and beam direction of the antennas. This paper presents a grounded coplanar waveguide based sensor, which can measure the complex permittivity at 77 GHz, as well as at other resonance frequencies, by applying it on top of the manufactured depaneling. The relative permittivity of the material under test (MUT) is a function of the resonance frequency shift and the dielectric loss of the MUT can be determined by transmission amplitude variations at the resonances. In addition, the sensor is robust against floating ground metallizations on inner printed circuit board layers, which are typically distributed over the entire surface below antennas. Furthermore, the impact from conductor surface roughness on the measured permittivity values is determined using the Gradient Model.},
    }
  • [DOI] C. Beck, H. J. Ng, R. Agethen, M. Pour Mousavi, H. Forstner, M. Wojnowski, K. Pressel, R. Weigel, A. Hagelauer, and D. Kissinger, "Industrial mmWave Radar Sensor in Embedded Wafer-Level BGA Packaging Technology", IEEE Sensors Journal, vol. 16, iss. 17, pp. 6566-6578, 2016. [Bibtex]
    @article{beck2016,
    author  = {Beck, Christopher and Ng, Herman Jalli and Agethen, Roman and Pour Mousavi, Mehran and Forstner, Hans-Peter and Wojnowski, Maciej and Pressel, Klaus and Weigel, Robert and Hagelauer, Amelie and Kissinger, Dietmar},
    title  = {Industrial mmWave Radar Sensor in Embedded Wafer-Level BGA Packaging Technology},
    journal  = {{IEEE Sensors Journal}},
    year  = {2016},
    month  = {07},
    day  = {07},
    pages  = {6566--6578},
    issn  = {1530-437X},
    doi  = {10.1109/JSEN.2016.2587731},
    publisher  = {IEEE},
    keywords  = {SiGe RFICs,SiP modules,millimeter-wave circuits,packaging,radar systems},
    volume  = {16},
    number  = {17},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1837},
    abstract  = {We present highly integrated 60GHz radar transceivers for industrial sensor applications. The bistatic and monostatic transceivers are implemented in the SiGe bipolar technology and packaged using the embedded wafer-level ball grid array (eWLB) technology that allows for direct embedding of the antennas in the package redistribution layer. In this way, very compact and efficient radar frontends comprising all millimeter-wave components can be implemented in an 8 × 8mm2 package. These frontends were soldered on a standard low-cost PCB based on FR4 material. For verification of the proposed frontends, an FMCW radar system was developed and set up within this work. Theoretical considerations and simulations as well as corresponding measurements were carried out for the evaluation of the designed system. The demonstrator results of these embedded radar sensors show excellent system performance at a high integration level.},
    }
  • M. Trautmann, B. Sanftl, F. Pflaum, R. Weigel, and A. Koelpin, "Coupling Filter Design for Data Transmission in an Inductive Power Transfer Systems" in Integration of Sustainable Energy Conference, 2016. [Bibtex]
    @inproceedings{trautmann2016a,
    author  = {Trautmann, Martin and Sanftl, Benedikt and Pflaum, Felix and Weigel, Robert and Koelpin, Alexander},
    title  = {Coupling Filter Design for Data Transmission in an Inductive Power Transfer Systems},
    booktitle  = {{Integration of Sustainable Energy Conference}},
    year  = {2016},
    month  = {07},
    location  = {Nuremberg},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1758},
    }
  • B. Sanftl, F. Pflaum, M. Trautmann, R. Weigel, and A. Koelpin, "Digital Transceiver Design for Data Communication in Inductive Power Transfer Systems" in Integration of Sustainable Energy Conference, 2016. [Bibtex]
    @inproceedings{sanftl2016b,
    author  = {Sanftl, Benedikt and Pflaum, Felix and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {Digital Transceiver Design for Data Communication in Inductive Power Transfer Systems},
    booktitle  = {{Integration of Sustainable Energy Conference}},
    year  = {2016},
    month  = {07},
    day  = {11},
    location  = {Nuernberg},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1762},
    }
  • [DOI] E. Boshkovska, A. Koelpin, D. W. Kwan Ng, N. Zlatanov, and R. Schober, "Robust Beamforming for SWIPT Systems with Non-linear Energy Harvesting Model" in 2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2016, pp. 1-5. [Bibtex]
    @inproceedings{boshkovska2016,
    author  = {Boshkovska, Elena and Koelpin, Alexander and Kwan Ng, Derrick Wing and Zlatanov, Nikola and Schober, Robert},
    title  = {Robust Beamforming for SWIPT Systems with Non-linear Energy Harvesting Model},
    booktitle  = {{2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}},
    year  = {2016},
    month  = {07},
    day  = {06},
    pages  = {1--5},
    doi  = {10.1109/SPAWC.2016.7536860},
    location  = {Edinburgh, UK},
    keywords  = {Energy Harvesting,Diode Detector},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1801},
    abstract  = {This paper investigates resource allocation for simultaneous wireless information and power transfer (SWIPT) downlink systems based on a non-linear energy harvesting model. The resource allocation algorithm design is formulated as a non-convex optimization problem for the maximization of the total harvested power. The proposed problem formulation not only takes into account imperfect channel state information (CSI) but also guarantees the quality-of-service (QoS) of information transfer. A novel iterative algorithm is proposed to obtain the globally optimal solution of the considered non-convex optimization problem. In each iteration, a rank-constrained semidefinite program (SDP) is solved optimally by SDP relaxation. Simulation results demonstrate the significant gains in harvested power and the robustness against CSI imperfection for the proposed optimal resource allocation, compared to a baseline scheme designed for perfect CSI and the conventional linear energy harvesting model.},
    }
  • A. El Assaad, M. Krug, and G. Fischer, "Hochgenaue Fahrzeugeigenlokalisierung mit der Nutzung einer Uniform Zirkularen Antennenanordnung" in Positionierung und Navigation für intelligente Verkehrssysteme (POSNAV), 2016. [Bibtex]
    @inproceedings{assaad2016b,
    author  = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    title  = {Hochgenaue Fahrzeugeigenlokalisierung mit der Nutzung einer Uniform Zirkularen Antennenanordnung},
    booktitle  = {{Positionierung und Navigation für intelligente Verkehrssysteme (POSNAV)}},
    year  = {2016},
    month  = {07},
    issn  = {2191-8287.},
    location  = {Berlin, Germany},
    publisher  = {DGON},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1811},
    }
  • M. Dietz, C. Schmidt, F. Trenz, J. Nehring, A. Hagelauer, R. Weigel, and D. Kissinger, "Dehydratations-Erkennung im Alltag durch integrierte nicht-invasive Sensorik" in Medizin Innovativ - MedTech Summit 2016, 2016. [Bibtex]
    @inproceedings{dietz2016,
    author  = {Dietz, Marco and Schmidt, Christian and Trenz, Florian and Nehring, Johannes and Hagelauer, Amelie and Weigel, Robert and Kissinger, Dietmar},
    title  = {Dehydratations-Erkennung im Alltag durch integrierte nicht-invasive Sensorik},
    booktitle  = {{Medizin Innovativ - MedTech Summit 2016}},
    year  = {2016},
    month  = {06},
    day  = {15},
    location  = {Nürnberg},
    keywords  = {Dehydratation,nicht-invasive Sensorik,Gesundheitsförderung,integrierte Diagnostik},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1838},
    abstract  = {Veränderungen im menschlichen Wasserhaushalt führen zur Verminderung der Leistungsfähigkeit im Alltag bis hin zu lebensbedrohlichen Situationen. Insbesondere hier ist eine Überwachung des menschlichen Wasserhaushaltes wichtig. Ein neuer Ansatz schafft die Möglichkeit, Nutzern auch im Alltag die aktive Überwachung ihres Hydratationszustandes zu ermöglichen. Das Verfahren beruht auf Sensorik, die als Stimulus eine elektromagnetische Welle verwendet. Aus der vom Gewebe reflektierten Welle können Rückschlüsse auf die Wasserkonzentration gezogen werden. So wird ein alltagstaugliches und hochintegriertes Detektionssystem möglich, welches vom Nutzer permanent getragen werden kann und die Analyse des Wasserhaushaltes erlaubt.},
    }
  • [DOI] F. Xie, R. Weiß, and R. Weigel, "Improved Mathematical Operations Based Calibration Method for Giant Magnetoresistive Current Sensor Applying B-Spline Modeling", IEEE Sensors Journal, pp. 4733-4739, 2016. [Bibtex]
    @article{xie2016a,
    author  = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    title  = {Improved Mathematical Operations Based Calibration Method for Giant Magnetoresistive Current Sensor Applying B-Spline Modeling},
    journal  = {{IEEE Sensors Journal}},
    year  = {2016},
    month  = {06},
    day  = {15},
    pages  = {4733--4739},
    issn  = {1558-1748},
    doi  = {10.1109/JSEN.2016.2558468},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1869},
    }
  • [DOI] T. Girg, C. Beck, M. Dietz, A. Hagelauer, D. Kissinger, and R. Weigel, "A 180 GHz Frequency Multiplier in a 130 nm SiGe BiCMOS Technology" in 2016 IEEE 14th International NEWCAS Conference, 2016, pp. 1-4. [Bibtex]
    @inproceedings{girg2016,
    author  = {Girg, Thomas and Beck, Christopher and Dietz, Marco and Hagelauer, Amelie and Kissinger, Dietmar and Weigel, Robert},
    title  = {A 180 GHz Frequency Multiplier in a 130 nm SiGe BiCMOS Technology},
    booktitle  = {{2016 IEEE 14th International NEWCAS Conference}},
    year  = {2016},
    month  = {06},
    pages  = {1--4},
    doi  = {10.1109/NEWCAS.2016.7604745},
    location  = {Vancouver},
    publisher  = {IEEE},
    keywords  = {SiGe BiCMOS,high data rate communication,180 GHz,simultaneous phase and amplitude regenerative sampling,transmitter,frequency multiplier},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1802},
    abstract  = {An integrated analog frequency multiplier for a novel high data rate communication system has been developed to multiply a 18 GHz input signal by ten to generate a 180 GHz output signal. With a first step the 18 GHz input signal is fed into a times five edge combiner, which generates an intermediate frequency of 90 GHz. Therefore five different phases with a delta of 72 degree are needed, that are provided by an active allpass filter chain. In a second step the 90 GHz intermediate frequency is given into a double-balanced Gilbert cell mixer. Here, frequency doubling is achieved by feeding the same signal into the LO and RF port of the mixer. Hence, the overall output frequency of 180 GHz results in 180 GHz with a simulated output power of -7 dBm. All simulations are done post-layout. The chip is implemented in a 130 nm BiCMOS technology with a chip area of 0.9 mm x 1 mm.},
    }
  • [DOI] T. Heyn, J. Morgade, S. Petersen, K. Pfaffinger, E. Lang, M. Hertlein, and G. Fischer, "Integration of Broadcast and Broadband in LTE/5G (IMB5) - Experimental Results From the eMBMS Testbeds" in European Conference on Networks and Communications 2016, 2016, pp. 1-6. [Bibtex]
    @inproceedings{heyn2016,
    author  = {Heyn, Thomas and Morgade, Javier and Petersen, Swen and Pfaffinger, Kerstin and Lang, Ekkehard and Hertlein, Markus and Fischer, Georg},
    title  = {Integration of Broadcast and Broadband in LTE/5G (IMB5) - Experimental Results From the eMBMS Testbeds},
    booktitle  = {{European Conference on Networks and Communications 2016}},
    year  = {2016},
    month  = {06},
    day  = {26},
    pages  = {1--6},
    doi  = {10.1109/EuCNC.2016.7561055},
    location  = {Athen},
    keywords  = {eMBMS,MBSFN,LTE-Broadcast 5G-Broadcast,Test facilities,Testbed,Field Trials,SDR platform},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1817},
    abstract  = {In this paper, results of the project "Integration of Broadcast and Broadband in LTE/5G" (IMB5) project are described. The IMB5 project explores the LTE-broadcast mode eMBMS within two detailed SFN field trial networks in Erlangen and Munich, Germany and identifies potential improvements of the current broadcasting feature within LTE towards future releases of 4G and 5G. On the User Equipment (UE) side, terminals from Qualcomm and Samsung, based on commercial chipsets have been used mainly for application layer tests. For detailed physical layer tests, two different LTE software-defined-radio platforms based on OpenAirInterface framework and from National Instruments have been set-up to support detailed field experiments with the existing and future extended eMBMS beyond the state-of-the-art in LTE release 12. On the application layer, it is shown in the project, that using LTE eMBMS, a flexible service mix of unicast mobile broadband and broadcast linear TV can be delivered. For country wide deployment of eMBMS single-frequency networks, physical layer waveform modifications like an increased cyclic prefix compared to current LTE standard are recommended.},
    }
  • [DOI] L. Shi, D. Hadlich, C. Söll, T. Ußmüller, and R. Weigel, "A Tone Mapping Algorithm Suited for Analog-Signal Real-Time Image Processing" in 12th International Conference on PhD Research in Microelectronics and Electronics (PRIME), 2016. [Bibtex]
    @inproceedings{shi2016,
    author  = {Shi, Lan and Hadlich, David and Söll, Christopher and Ußmüller, Thomas and Weigel, Robert},
    title  = {A Tone Mapping Algorithm Suited for Analog-Signal Real-Time Image Processing},
    booktitle  = {{12th International Conference on PhD Research in Microelectronics and Electronics (PRIME)}},
    year  = {2016},
    month  = {06},
    doi  = {10.1109/PRIME.2016.7519457},
    location  = {Lisbon, Portugal},
    keywords  = {Image Processing,Tone Mapping,CMOS Image Sensor,Analog Circuit,GRK 1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1810},
    abstract  = {This work presents a Tone Mapping Operator (TMO) which adjusts the High Dynamic Range (HDR) of image sensor data to the limited dynamic range of conventional displays with analog signal processing. It is based on Photographic Tone Reproduction (PTR) and suitable for analog circuit design in a CMOS image sensor in order to reduce the hardware cost and operation time for real-time image processing. For this reason, the characteristic advantage and calculation limitation of analog technology are considered in the TMO algorithm proposal. Furthermore, the appropriate modelling is built and simulated in Verilog-A. The function of the algorithm is feasible for analog processing. The frequency of the analog TMO is upper 52MHz while it consumes 55mW. The simulation results of test images are compared with the digital global TMO and the proposed analog TMO provides a reasonable similar dynamic range compression.},
    }
  • [DOI] A. Tobola, H. Leutheuser, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, and G. Fischer, "Battery Runtime Optimization Toolbox for Wearable Biomedical Sensors" in 13th International Conference on Wearable and Implantable Body Sensor Networks, 2016, pp. 199-204. [Bibtex]
    @inproceedings{tobola2016,
    author  = {Tobola, Andreas and Leutheuser, Heike and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Fischer, Georg},
    title  = {Battery Runtime Optimization Toolbox for Wearable Biomedical Sensors},
    booktitle  = {{13th International Conference on Wearable and Implantable Body Sensor Networks}},
    year  = {2016},
    month  = {06},
    pages  = {199--204},
    issn  = {2376-8894},
    doi  = {10.1109/BSN.2016.7516259},
    location  = {San Fransisco, CA, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1816},
    abstract  = {Battery runtime is a critical concern for practical usage of wearable biomedical sensor systems. A long runtime requires an interdisciplinary low-power knowledge and appropriate design tools. We addressed this issue designing a toolbox in three parts: 1) Modular evaluation kit for development of wearable ultralow- power biomedical sensors; (2) Miniaturized, wearable, and code compatible sensor system with the same properties as the development kit; (3) Web-based battery runtime calculator for our sensor systems. The purpose of the development kit is optimization of the power consumption. Once optimization is finished, the same embedded software can be transferred to the miniaturized body worn sensor. The web-based application supports development quantifying the effects of use case and design decisions on battery runtime. A sensor developer can select sensor modules, configure sensor parameters, enter use case specific requirements, and select a battery to predict the battery runtime for a specific application. Our concept adds value to development of ultra-low-power biomedical wearable sensors. The concept is effective for professional work and educational purposes.},
    }
  • [DOI] B. Sanftl, F. Pflaum, M. Trautmann, R. Weigel, and A. Koelpin, "A Novel Approach for Reliable Communications within Inductive Power Transfer Systems" in Wireless Power Transfer Conference (WPTC), 2016, pp. 1-4. [Bibtex]
    @inproceedings{sanftl2016a,
    author  = {Sanftl, Benedikt and Pflaum, Felix and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {A Novel Approach for Reliable Communications within Inductive Power Transfer Systems},
    booktitle  = {{Wireless Power Transfer Conference (WPTC)}},
    year  = {2016},
    month  = {05},
    day  = {06},
    pages  = {1--4},
    doi  = {10.1109/WPT.2016.7498830},
    location  = {Aveiro, Portugal},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1764},
    abstract  = {This paper presents a novel approach for simultaneous inductive power transfer (IPT) and communication in one system. The communication part is using the coupled pair of coils of the IPT system as transmitting medium. The proposed architecture is usable in new and existing IPT systems with operating frequencies above 100 kHz. The challenge is to enable robust and reliable communication in the noisy environment of the power transfer. High reliability is necessary as it shall transmit sensor data error free. For example, this data link can be used for closed-loop operation of the IPT system. Through its fully digital implementation it can be quickly adapted for various other applications. It will be shown that a reliable communication system with joint power transfer and continuous data transmission over the same pair of coupling coils can be realised. Even during high power transfers it features a robust communication channel with outstanding signal to noise ratio and advantageous error vector magnitude. For proof of concept the key performance values of the proposed communication architecture are measured in a 20 W IPT system.},
    }
  • [DOI] F. Trenz, R. Weigel, and D. Kissinger, "Evaluation of a Reflection Based Dehydration Sensing Method for Wristwatch Integration" in MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications, 2016. [Bibtex]
    @inproceedings{trenz2016,
    author  = {Trenz, Florian and Weigel, Robert and Kissinger, Dietmar},
    title  = {Evaluation of a Reflection Based Dehydration Sensing Method for Wristwatch Integration},
    booktitle  = {{MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications}},
    year  = {2016},
    month  = {05},
    doi  = {10.1109/MIKON.2016.7491935},
    location  = {Krakow, Poland},
    publisher  = {IEEE},
    keywords  = {Biomedical measurement,Microwave sensors,Biosensors,Reflectometry},
    volume  = {21},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1771},
    abstract  = {This paper presents a compact dehydration measurement method, keeping in mind a system integration in a wristwatch housing. In contrast to the conventional measurement approach using two measurement antennas, the proposed measurement setup uses only one antenna and one metallic reflector. Measurements have been performed using a patch antenna immersed in a steel basin filled with a tissue-equivalent liquid. The microstrip antenna has been optimized for an application in the 2.45GHz ISM band and features a biocompatible passivation layer and a rigid aluminum housing. The tissue-equivalent liquid mimicks dielectric tissue properties over a hypotonic hydration change. The steel basin acts as a liquid retainer and as a metallic reflector for the measurement setup. Measurements with the proposed setup have shown, that a clear distinction of physiologically relevant hydration levels is possible.},
    }
  • [DOI] M. Sporer, A. Koelpin, and R. Weigel, "A Planar Reconfigurable Focal Plane Array Antenna for 24 GHz" in IEEE International Microwave Symposium, 2016, pp. 1-3. [Bibtex]
    @inproceedings{sporer2016,
    author  = {Sporer, Michael and Koelpin, Alexander and Weigel, Robert},
    title  = {A Planar Reconfigurable Focal Plane Array Antenna for 24 GHz},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2016},
    month  = {05},
    day  = {28},
    pages  = {1--3},
    doi  = {10.1109/MWSYM.2016.7540286},
    location  = {San Francisco},
    keywords  = {focal plane array,polarization control,pin-diode switches,aperture coupling},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1782},
    abstract  = {This paper presents a reconfigurable focal plane array (FPA) for lens or reflector based antenna systems in the 24 GHz ISM band. The FPA consists of five equal uniformlyspaced antenna elements with switchable polarization, fabricated on a four layer substrate using conventional low-cost PCB technology. For compactness and increased bandwidth, the design is based on aperture-coupled patch radiators on top of the substrate, each embedded in a cavity in order to reduce mutual coupling. Feeding is done by means of two orthogonal H-shaped slots which are excited by microstrip transmission lines etched on the bottom layer. A discrete pin-diode single pole, double throw (SPDT) switch directly below the patch allows for polarization control and facilitates a compact element size of 10mm x 10 mm including the cavity walls. Another discrete pin-diode SP5T switch allows the selection of one of the five FPA elements at a time.},
    }
  • [DOI] B. Sanftl, C. Joffe, M. Trautmann, R. Weigel, and A. Koelpin, "Reliabe Data Link for Power Transfer Control in an Inductive Charging System for Electric Vehicles" in IEEE MTT-S International Conference on Microwaves for Intelligent Mobility, 2016. [Bibtex]
    @inproceedings{sanftl2016,
    author  = {Sanftl, Benedikt and Joffe, Christopher and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    title  = {Reliabe Data Link for Power Transfer Control in an Inductive Charging System for Electric Vehicles},
    booktitle  = {{IEEE MTT-S International Conference on Microwaves for Intelligent Mobility}},
    year  = {2016},
    month  = {05},
    day  = {19},
    doi  = {10.1109/ICMIM.2016.7533929},
    location  = {San Diego, USA},
    publisher  = {IEEE MTT-S},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1769},
    abstract  = {This paper presents a novel data link for electric vehicles charged through inductive power transfer (IPT) systems. The data link uses the magnetically coupled coils as transmission medium. The data link is intended to transfer the instantaneous current and voltage values in the power receiving circuitry on the EV platform. One key goal is to enable robust and reliable communication for closed-loop operation of the IPT system. By careful system design the data link can be used in the noisy environment of the power transfer. For the communication architecture a fully digital approach is considered. The digital signal processing is done in an industrial controller thus, the data link can be implemented into existing systems with minimum changes. For proof of concept the communication system is connected to a 3 kW IPT system and evaluated. These key performance values for simultaneous power transfer and communication will be presented. The data link stands out with its high signal to noise ratio and error vector magnitude, consequently high reliability can be guaranteed.},
    }
  • [DOI] F. Steinhäußer, A. Talai, A. Koelpin, R. Weigel, A. Bittner, and U. Schmid, "Permittivity Reduction and Surface Modification by Porosification of LTCC", Ceramics International, vol. 42, iss. 7, pp. 8925-8931, 2016. [Bibtex]
    @article{steinhaeusser2016a,
    author  = {Steinhäußer, Frank and Talai, Armin and Koelpin, Alexander and Weigel, Robert and Bittner, Achim and Schmid, Ulrich},
    title  = {Permittivity Reduction and Surface Modification by Porosification of LTCC},
    journal  = {{Ceramics International}},
    year  = {2016},
    month  = {05},
    day  = {15},
    pages  = {8925--8931},
    issn  = {0272-8842},
    doi  = {10.1016/j.ceramint.2016.02.149},
    publisher  = {Elsevier},
    keywords  = {LTCC,porosification},
    volume  = {42},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1757},
    abstract  = {The wet-chemical porosification of low temperature co-fired ceramics is investigated with respect to the resulting permittivity reduction and surface modification. Therefore, four commercially available tapes were treated and characterized by measuring the detuning of a resonator as well as by chromatic white light and scanning electron microscopy analyses. The results show a technically relevant permittivity reduction of about 15 to 18\% measured at a frequency of 44 GHz. Thereby, the vertical distribution of the air, embedded by the porosification is of high influence. The achievable reduction in permittivity strongly counteracts the surface quality, which is necessary for applying high quality metallization lines.},
    }
  • [DOI] S. Wibbing, S. Mann, F. Lurz, S. Erhardt, S. Lindner, R. Weigel, and A. Koelpin, "A cost-efficient 61 GHz high-resolution radar sensor for industrial positioning and distance measurement" in 21st International Conference on Microwave, Radar and Wireless Communications (MIKON 2016), 2016, pp. 1-4. [Bibtex]
    @inproceedings{wibbing2016a,
    author  = {Wibbing, Sascha and Mann, Sebastian and Lurz, Fabian and Erhardt, Stefan and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {A cost-efficient 61 GHz high-resolution radar sensor for industrial positioning and distance measurement},
    booktitle  = {{21st International Conference on Microwave, Radar and Wireless Communications (MIKON 2016)}},
    year  = {2016},
    month  = {05},
    day  = {09},
    pages  = {1--4},
    doi  = {10.1109/MIKON.2016.7491940},
    location  = {Krakau, Poland},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1795},
    abstract  = {In this paper a novel 61GHz radar sensor node for industrial positioning and distance measurement is presented. The sensor provides numerous functions enabling a broad range of signal processing technologies and is designed with regard to cost-efficient implementation only using commercial available components without limiting the area of possible applications. Beside the requirement analysis and system design, several measurements of antenna isolation and distance resolution are depicted and discussed.},
    }
  • [DOI] V. Silva, D. Podoskin, J. Stegner, M. Fischer, S. Gropp, M. Hein, M. Hoffmann, J. Müller, R. Weigel, G. Fischer, and A. Hagelauer, "Evaluation of a Multiphysical RF MEMS Oscillator Based on LTE Receiver Performance Requirements" in International Conference on Microwave, Radar and Wireless Communications (MIKON), 2016. [Bibtex]
    @inproceedings{silva2016,
    author  = {Silva, Victor and Podoskin, Dmitry and Stegner, Johannes and Fischer, Michael and Gropp, Sebastian and Hein, Matthias and Hoffmann, Martin and Müller, Jens and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    title  = {Evaluation of a Multiphysical RF MEMS Oscillator Based on LTE Receiver Performance Requirements},
    booktitle  = {{International Conference on Microwave, Radar and Wireless Communications (MIKON)}},
    year  = {2016},
    month  = {05},
    day  = {09},
    doi  = {10.1109/MIKON.2016.7492025},
    location  = {Krakow, Poland},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1805},
    abstract  = {A simulation methodology dealing with the complexity of multiphysical MEMS models and their evaluation according to RF specification is presented. It is focused towards the evaluation of a hybrid MEMS-CMOS RF oscillator prior its realization, based on the demodulation performance of an LTE user equipment. The proposed multiphysical simulation approach enables to meet the constraints of the receiver specification, the design rules for manufacturing and the implementation with the novel silicon-ceramic composite substrate (SiCer) based on co-simulation and a parametrized behavioral model of the MEMS resonator. Thus, allowing to successfully address the constraints at the different abstraction levels of the design and manufacturing processes.},
    }
  • [DOI] F. Lurz, S. Lindner, S. Mann, S. Linz, R. Weigel, and A. Koelpin, "Precise and Fast Frequency Determination of Resonant SAW Sensors by a Low-Cost Six-Port Interferometer" in IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2016, pp. 369-374. [Bibtex]
    @inproceedings{lurz2016a,
    author  = {Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {Precise and Fast Frequency Determination of Resonant SAW Sensors by a Low-Cost Six-Port Interferometer},
    booktitle  = {{IEEE International Instrumentation and Measurement Technology Conference (I2MTC)}},
    year  = {2016},
    month  = {05},
    pages  = {369--374},
    doi  = {10.1109/I2MTC.2016.7520390},
    location  = {Taipei, Taiwan},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1734},
    abstract  = {Surface acoustic wave (SAW) resonators are used for a broad range of wireless sensing applications, some of them having high demands on the resolution as well as the measurement update rate. This paper presents a new interrogation method for precise and fast frequency determination of passive SAW resonators based on instantaneous frequency measurement (IFM) by a low-cost Six-Port interferometer. By using a delay line the frequency measurement is reduced to a phase measurement that can be instantaneously evaluated by the Six-Port structure. No complex signal processing is necessary providing high update rates and low hardware costs. A demonstrator in the 2.4 GHz frequency band shows the feasibility and the precision of the concept with measurement times of only a few microseconds.},
    }
  • [DOI] A. El Assaad, M. Krug, and G. Fischer, "Distance and Vehicle Speed Estimation Using a Uniform Circular Array Antenna" in Vehicular Technology Conference, 2016. [Bibtex]
    @inproceedings{assaad2016,
    author  = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    title  = {Distance and Vehicle Speed Estimation Using a Uniform Circular Array Antenna},
    booktitle  = {{Vehicular Technology Conference}},
    year  = {2016},
    month  = {05},
    doi  = {10.1109/VTCSpring.2016.7504196},
    location  = {Nanjing, China},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1770},
    }
  • [DOI] J. Röber, S. Senega, A. Bänisch, A. Hagelauer, R. Weigel, and S. Lindenmeier, "Integrated Diversity Front-End for Digital Satellite Radio Reception" in IEEE MTT International Microwave Symposium (IMS), 2016, pp. 1-4. [Bibtex]
    @inproceedings{roeber2016,
    author  = {Röber, Jürgen and Senega, Simon and Bänisch, Andreas and Hagelauer, Amelie and Weigel, Robert and Lindenmeier, Stefan},
    title  = {Integrated Diversity Front-End for Digital Satellite Radio Reception},
    booktitle  = {{IEEE MTT International Microwave Symposium (IMS)}},
    year  = {2016},
    month  = {05},
    pages  = {1--4},
    doi  = {10.1109/MWSYM.2016.7540318},
    location  = {San Francisco, USA},
    publisher  = {IEEE},
    keywords  = {SDARS,Diversity,LNA,Phase Shifter,Power Combiner,Integrated Circuit,RF Front-end},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1783},
    abstract  = {This paper presents a diversity integrated circuit (IC) for digital satellite radio (SDARS) at 2.3GHz. The IC contains an RF circuit which enables fast adaptive processing of up to three antenna signals for maximum ratio combining in a fast fading scenario. The RF front-end of the diversity system is integrated using 150 nm CMOS technology. The phase of each of the three input paths can be adjusted in quantized steps of 45° from 0° to 360°. If the input signal of one path suffers from fading, a single path can be completely turned off for reducing the power consumption. The diversity IC is evaluated by means of laboratory measurements as well as by tests where antenna signals of real fading scenarios are processed using the presented IC. The results showa typical improvement in radio reception of more than a factor of 4 compared to a conventional reception system.},
    }
  • [DOI] R. S. Abd El-Azeem, M. A. El-Moursy, A. M. Nassar, A. Gharib, N. T. Abou-El-Kheir, and M. S. El-Kharashi, "Direct computation for high performance interpolation filter", Microelectronics Journal, vol. 51, pp. 112-118, 2016. [Bibtex]
    @article{el-azeem2016,
    author  = {Abd El-Azeem, Ratshih S. and El-Moursy, Magdy A. and Nassar, Amin M. and Gharib, Ahmed and Abou-El-Kheir, Nahla T. and El-Kharashi, Moataz S.},
    title  = {Direct computation for high performance interpolation filter},
    journal  = {{Microelectronics Journal}},
    year  = {2016},
    month  = {05},
    pages  = {112--118},
    doi  = {10.1016/j.mejo.2016.01.006},
    publisher  = {Elsevier},
    volume  = {51},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1828},
    abstract  = {A Computational Filter (CF) that employs a sample calculation functional block is presented. CF significantly reduces the hardware requirements to realize an interpolation filter2. The Computational Filter is compared with advanced Finite Impulse Response (CFIR). CFIR programmable filter is implemented using a Computation Sharing Multiplication (CSHM) technique to optimize the conventional design. The proposed CF significantly reduces the implementation area as compared to CFIR. The maximum average error for wide range of interpolation factors from 8 to 256 is 2.59\% for CF and 0.02\% for CFIR. Xilinx Virtex5 FPGA XC5VTX240T device is used to compare the proposed design and the advanced CFIR for interpolation factor of 8, 16, 32, and 64. The Computational Filter average reduction in hardware implementation is 78.8\%, 89.5\%, 94.5\%, and 97.1\% for interpolation factor of 8, 16, 32, and 64, respectively. The maximum operating frequency for the CFIR is 1 MHz. The maximum operating frequency is 0.92 MHz, 0.57 MHz, 0.32 MHz, and 0.2 MHz for interpolation factor of 8, 16, 32, and 64, respectively.},
    }
  • [DOI] A. El Assaad, M. Krug, and G. Fischer, "Distance and Vehicle Speed Estimation in OFDM Multipath Channels" in MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications, 2016. [Bibtex]
    @inproceedings{assaad2016a,
    author  = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    title  = {Distance and Vehicle Speed Estimation in OFDM Multipath Channels},
    booktitle  = {{MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications}},
    year  = {2016},
    month  = {05},
    doi  = {10.1109/MIKON.2016.7491943},
    location  = {Krakow, Poland},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1794},
    }
  • F. Lurz, S. Mann, S. Linz, S. Lindner, R. Weigel, and A. Koelpin, "Detektion und Auswertung: Labview-basierte Echtzeitsignalverarbeitung für die Radarsensorik", pp. 56-57, 2016. [Bibtex]
    @other{lurz2016b,
    author  = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {Detektion und Auswertung: Labview-basierte Echtzeitsignalverarbeitung für die Radarsensorik},
    booktitle  = {{elektronik industrie 04/2016}},
    year  = {2016},
    month  = {04},
    pages  = {56--57},
    publisher  = {Hüthig GmbH},
    url  = {http://www.elektronik-industrie.de/2016/04/12/elektronik-industrie-042016/},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1804},
    abstract  = {Hochfrequenz-Radarsensoren sind eine viel­versprechende Alternative zu herkömmlichen Anwesenheitssensoren. Der folgende Artikel beschreibt ein 24-GHz-Low-Power-Radarsystem und dessen Labview-basierte Echtzeitsignalverarbeitung. Durch die phasenbasierte Messung wird eine hohe Sensitivität des Systems erreicht, sodass auch statische Personen anhand ihrer Vitalparameter detektiert werden können.},
    }
  • [DOI] A. Steg, M. Reichenbach, C. Söll, L. Shi, A. Maier, and C. Riess, "Dynamic Pixel Binning allows Spatial and Angular Resolution Tradeoffs to improve Image Quality in X-Ray C-Arm CT" in IEEE International Symposium on Biomedical Imaging (ISBI), 2016, pp. 577-580. [Bibtex]
    @inproceedings{steg2016,
    author  = {Steg, Alexander and Reichenbach, Marc and Söll, Christopher and Shi, Lan and Maier, Andreas and Riess, Christian},
    title  = {Dynamic Pixel Binning allows Spatial and Angular Resolution Tradeoffs to improve Image Quality in X-Ray C-Arm CT},
    booktitle  = {{IEEE International Symposium on Biomedical Imaging (ISBI)}},
    year  = {2016},
    month  = {04},
    pages  = {577--580},
    doi  = {10.1109/ISBI.2016.7493334},
    location  = {Prague},
    keywords  = {Pixel Binning,X-ray detector,C-arm reconstruction,Dynamic Pixel Binning,X-ray C-arm CT},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1748},
    abstract  = {When designing an acquisition protocol for a C-arm CT acquisition, a tradeoff has to be made between scan time and the amount of acquired data. If the scan is increased, data of spatially and angular higher resolution can be acquired. If the scan time is fixed, one has to tradeoff spatial and angular resolution, which may either lead to oversmoothing or artifacts from angular undersampling. In this work, we investigate the viability of smart cameras for pushing the boundary for this bottleneck considerably further. The detector pixels are enhanced by processing units that are able to perform a limited amount of local operations. This allows an online, dynamical adaptation of the pixel binning, depending on whether a local neighborhood is smooth or not. We demonstrate on phantom data that this approach allows to save about 75\% of the data, obtaining a reconstruction quality comparable to 1 x 1 binning at a data rate comparable to 2 x 2 pixel binning.},
    }
  • [DOI] S. N. Easwaran, S. K. Venugopal, and R. Weigel, "Voltage Clamping Circuit with +/-100mV Precision in High Voltage OTA", Electronics Letters, pp. 921-923, 2016. [Bibtex]
    @article{easwaran2016b,
    author  = {Easwaran, Sri Navaneeth and Venugopal, Sunil Kashyap and Weigel, Robert},
    title  = {Voltage Clamping Circuit with +/-100mV Precision in High Voltage OTA},
    journal  = {{Electronics Letters}},
    year  = {2016},
    month  = {04},
    pages  = {921--923},
    issn  = {0013-5194},
    doi  = {10.1049/el.2016.0571},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1883},
    }
  • [DOI] A. Talai, S. Mann, R. Weigel, and A. Koelpin, "A Grounded Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor" in German Microwave Conference GeMIC 2016, 2016, pp. 457-460. [Bibtex]
    @inproceedings{talai2016,
    author  = {Talai, Armin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {A Grounded Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor},
    booktitle  = {{German Microwave Conference GeMIC 2016}},
    year  = {2016},
    month  = {03},
    pages  = {457--460},
    doi  = {10.1109/GEMIC.2016.7461654},
    location  = {Bochum},
    publisher  = {IEEE},
    keywords  = {Antenna Array,Grounded CoplanarWaveguide,Differential Frequency,Electromagnetic Simulation,Floating Ground,Material Characterization,Relative Permittivity},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1750},
    abstract  = {Microwave Materials such as Rogers RO3003 are subject to process-related fluctuations in terms of the relative permittivity. The behavior of high frequency circuits like patchantenna arrays and their distribution networks is dependent on the effective wavelength. Therefore, fluctuations of the relative permittivity will influence the resonance frequency and antenna beam direction. This paper presents a grounded coplanar waveguide based sensor, which can measure the relative permittivity at 77GHz, as well as at other resonance frequencies, by applying it on top of the manufactured depaneling. In addition, the sensor is robust against floating ground metallizations on inner printed circuit board layers, which are typically distributed over the entire surface below antennas.},
    }
  • F. Steinhäußer, A. Talai, G. Sandulache, R. Weigel, A. Koelpin, W. Hansal, A. Bittner, and U. Schmid, "Pulse Plated Silver Metallization on Porosified Low Temperature Co-fired Ceramics for High Frequency Applications", Microelectronics Reliability, vol. 60, pp. 93-100, 2016. [Bibtex]
    @article{steinhaeusser2016,
    author  = {Steinhäußer, Frank and Talai, Armin and Sandulache, Gabriela and Weigel, Robert and Koelpin, Alexander and Hansal, Wolfgang and Bittner, Achim and Schmid, Ulrich},
    title  = {Pulse Plated Silver Metallization on Porosified Low Temperature Co-fired Ceramics for High Frequency Applications},
    journal  = {{Microelectronics Reliability}},
    year  = {2016},
    month  = {03},
    pages  = {93--100},
    publisher  = {Elsevier},
    keywords  = {LTCC,porosification},
    volume  = {60},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1756},
    abstract  = {Advanced high frequency systems such as needed in modern radar applications, require high conductive metallizations as well as substrates with areas of variable permittivity. This paper presents the combination of the selective porosification technology of low temperature co-fired ceramics and electro pulse plated silver microstrip lines. By means of selective plating methods, line widths of 20 μm can be manufactured featuring low resistivity values down to 2.33 μΩ·cm, without detectable pore penetration. The substrate permittivity is measured facilitating a combined method of ring resonator detuning and 3D field simulations resulting in a reduction of 6.5\% with a shift from approx. 7.52 to 7.03 at 66 GHz due to the porosification. As often outlined in literature the major challenge in using silver as a conductor lies in its high tendency of agglomeration and microstructural transformation especially in oxygen containing atmosphere even at low temperatures. Therefore, the effect of different temperature loads up to 500°C on the dc film resistivity are measured using the VAN DER PAUW technique and compared to scanning electron microscope analyses.},
    }
  • [DOI] T. Fersch, A. Buhmann, A. Koelpin, and R. Weigel, "The Influence of Rain on Small Aperture LiDAR Sensors" in German Microwave Conference, 2016, pp. 84-87. [Bibtex]
    @inproceedings{fersch2016,
    author  = {Fersch, Thomas and Buhmann, Alexander and Koelpin, Alexander and Weigel, Robert},
    title  = {The Influence of Rain on Small Aperture LiDAR Sensors},
    booktitle  = {{German Microwave Conference}},
    year  = {2016},
    month  = {03},
    day  = {14},
    pages  = {84--87},
    isbn  = {978-3-9812-6687-0},
    doi  = {10.1109/GEMIC.2016.7461562},
    location  = {Bochum, Germany},
    publisher  = {Institut für Mikrowellen und Antennentechnik - IMA},
    keywords  = {LiDAR},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7461562&isnumber=7461526},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1914},
    abstract  = {The influence of rain on pulsed LiDAR systems with a miniaturized aperture and small laser beam cross sections was investigated based on two situations deemed critical. First, discrete rain drops appearing very close to the laser aperture could lead to a complete deflection of the laser beam out of the original direction when drop and beam overlap. Our semi-probabilistic, semi-analytical model however indicates that the rate of deflected scan events is negligible. Second, the emitter surface could be, to a greater or lesser extent, covered with drops of various size, degrading the performance. We found an optimum ratio between drop diameter and laser beam diameter, favoring larger laser beams. Also this effect however is, in total, not critical.},
    }
  • [DOI] S. Wibbing, F. Lurz, S. Mann, S. Lindner, S. Linz, R. Weigel, and A. Koelpin, "Determining Linearity of Wideband FMCW-Systems Based on Low-Cost Six-Port Technology" in GeMiC 2016 - German Microwave Conference, 2016, pp. 389-392. [Bibtex]
    @inproceedings{wibbing2016,
    author  = {Wibbing, Sascha and Lurz, Fabian and Mann, Sebastian and Lindner, Stefan and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {Determining Linearity of Wideband FMCW-Systems Based on Low-Cost Six-Port Technology},
    booktitle  = {{GeMiC 2016 - German Microwave Conference}},
    year  = {2016},
    month  = {03},
    pages  = {389--392},
    doi  = {10.1109/GEMIC.2016.7461637},
    location  = {Bochum, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1767},
    abstract  = {This paper describes a new method for high accuracy determination of instantaneous frequency and linearity of frequency modulated continuous wave systems. The presented setup reduces the frequency measurement to a phase measurement based on Six-Port interferometer with a delay line. To extend the range of possible input frequencies and power levels, a calibration method and the appropriate correction algorithm is introduced. Evaluation of linearity and frequency of the input signal is obtained without the use of computationally intensive Fourier transform which allows the signal processing based on low-cost micro-controllers.},
    }
  • [DOI] S. Fuchs and R. Weigel, "Advanced receiver testing in a high volume environment using pogo X-talk" in German Microwave Conference 2016, 2016, pp. 57-60. [Bibtex]
    @inproceedings{fuchs2016,
    author  = {Fuchs, Stephan and Weigel, Robert},
    title  = {Advanced receiver testing in a high volume environment using pogo X-talk},
    booktitle  = {{German Microwave Conference 2016}},
    year  = {2016},
    month  = {03},
    pages  = {57--60},
    doi  = {10.1109/GEMIC.2016.7461555},
    location  = {Bochum},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1768},
    }
  • [DOI] C. Hsieh, J. Röber, A. Bänisch, A. Hagelauer, T. Ußmüller, and R. Weigel, "A low power CMOS transmitter with Class-E power amplifiers for positioning application in multi-band" in GeMiC 2016, German Microwave Conference 2016, 2016, pp. 433-436. [Bibtex]
    @inproceedings{hsieh2016,
    author  = {Hsieh, Chia-Yu and Röber, Jürgen and Bänisch, Andreas and Hagelauer, Amelie and Ußmüller, Thomas and Weigel, Robert},
    title  = {A low power CMOS transmitter with Class-E power amplifiers for positioning application in multi-band},
    booktitle  = {{GeMiC 2016, German Microwave Conference 2016}},
    year  = {2016},
    month  = {03},
    pages  = {433--436},
    doi  = {10.1109/GEMIC.2016.7461648},
    location  = {Bochum, Germany},
    publisher  = {IEEE},
    keywords  = {positioning,class-E},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1787},
    abstract  = {In this paper, a transmitter for outdoor positioning application such as animal tracking is introduced. Class-E power amplifiers are exploited in the transmitter system in order to increase the energy efficiency for the demand of long operation duration of the system. Along with the need of power saving, a circuit topology is proposed to realize the modulation based on Binary Offset Carrier (BOC) technique at two different bands to achieve higher positioning accuracy and better utilization of the spectrum by transmitting data simultaneously. The operating frequencies of the system are 868 MHz and 2.4 GHz, and the circuit is designed in 150nm CMOS technology. The power efficiency of the class-E power amplifier is greater than 50 \% over 2.4-2.8 GHz while the measured output power is greater than 10 dBm from 1.3 to 2.8 GHz.},
    }
  • [DOI] S. Mann, S. Linz, S. Erhardt, S. Lindner, F. Lurz, H. Maune, R. Weigel, and A. Koelpin, "Differential Measuring Dual Six-Port Concept and Antenna Design for an Inline Foil Thickness Sensor" in GeMiC 2016 - The 10th German Microwave Conference, 2016, pp. 165-168. [Bibtex]
    @inproceedings{mann2016a,
    author  = {Mann, Sebastian and Linz, Sarah and Erhardt, Stefan and Lindner, Stefan and Lurz, Fabian and Maune, Holger and Weigel, Robert and Koelpin, Alexander},
    title  = {Differential Measuring Dual Six-Port Concept and Antenna Design for an Inline Foil Thickness Sensor},
    booktitle  = {{GeMiC 2016 - The 10th German Microwave Conference}},
    year  = {2016},
    month  = {03},
    pages  = {165--168},
    doi  = {10.1109/GEMIC.2016.7461581},
    location  = {Bochum, Germany},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1749},
    abstract  = {Sensor elements play an important role in future manufacturing plants. This paper presents a solution for an foil thickness sensor for running production lines. Based on the elaborated Six-Port concept, a differential measuring concept is proposed and discussed. Furthermore, an end-fire antenna design for the addressed application is demonstrated and far field measurement results are shown and compared to simulation. Finally, interference effects between two antennas are experimentally investigated as a function of the relative rotation between two oppositely placed devices.},
    }
  • A. Meyer, J. Kirchner, and G. Fischer, "EKG-Messung mittels passiver kapazitiv gekoppelter Elektroden" in Analogworkshop 2016, 2016. [Bibtex]
    @inproceedings{meyer2016,
    author  = {Meyer, Andreas and Kirchner, Jens and Fischer, Georg},
    title  = {EKG-Messung mittels passiver kapazitiv gekoppelter Elektroden},
    booktitle  = {{Analogworkshop 2016}},
    year  = {2016},
    month  = {03},
    day  = {03},
    location  = {Hannover},
    publisher  = {Leibniz Universität Hannover},
    keywords  = {ECG,capacitatively coupled electrode},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1798},
    }
  • [DOI] J. Nehring, M. Dietz, K. Aufinger, G. Fischer, R. Weigel, and D. Kissinger, "A 4–32-GHz Chipset for a Highly Integrated Heterodyne Two-Port Vector Network Analyzer", IEEE Transactions on Microwave Theory and Techniques, 2016. [Bibtex]
    @article{nehring2016,
    author  = {Nehring, Johannes and Dietz, Marco and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 4–32-GHz Chipset for a Highly Integrated Heterodyne Two-Port Vector Network Analyzer},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2016},
    month  = {02},
    day  = {11},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2016.2520483},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1793},
    }
  • [DOI] S. Ripperger, D. Josic, M. Hierold, A. Koelpin, R. Weigel, M. Hartmann, R. Page, and F. Mayer, "Automated proximity sensing in small vertebrates: design of miniaturized sensor nodes and first field tests in bats", Ecology and Evolution, iss. 7, 2016. [Bibtex]
    @article{ripperger2016,
    author  = {Ripperger, Simon and Josic, Darija and Hierold, Martin and Koelpin, Alexander and Weigel, Robert and Hartmann, Markus and Page, Rachel and Mayer, Frieder},
    title  = {Automated proximity sensing in small vertebrates: design of miniaturized sensor nodes and first field tests in bats},
    journal  = {{Ecology and Evolution}},
    year  = {2016},
    month  = {02},
    issn  = {2045-7758},
    doi  = {10.1002/ece3.2040},
    publisher  = {Oxford},
    keywords  = {bats,wireless sensor network},
    edition  = {6},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1784},
    abstract  = {Thorough documentation of social interactions is crucial to study the causes and consequences of sociality in gregarious animals. Wireless digital transceivers represent a promising tool to revolutionize data collection for the study of social interactions in terms of the degree of automation, data quantity and quality. Unfortunately, devices for automated proximity sensing via direct communication among animal-borne sensors are usually heavy and do not allow for the investigation of small vertebrate species, which represent the majority of avian and mammalian taxa. We present an animal-borne sensor node that is built from commercially available components and uses a sophisticated scheme for energy-efficient communication, with high sampling rates at relatively low power consumption. To our best knowledge, at less than two grams this sensor node represents the lightest tag of its kind. We demonstrate its basic functionality under laboratory conditions and its applicability for the study of social interactions among free-ranging animals. The first field tests were performed on two species of bats in temperate and tropical ecosystems. Given our specifications, the system was especially sensitive to changes in distance within the short range (up to a distance of 4 meters between tags). High spatial resolution at short distances enables the evaluation of interactions among individuals at a fine scale, and the investigation of close contacts. This technology opens new avenues of research, allowing detailed investigation of events associated with social contact, such as pathogen transmission, social learning and resource sharing. A switch from traditional methods to the application of digital transceiver chips in proximity sensing offers an enormous increase in data quality and quantity that in turn allows for a deeper understanding of animal ecology and social behavior.},
    }
  • [DOI] M. Kloc, S. Rieß, J. Brendel, S. Linz, M. Gardill, R. Weigel, and G. Fischer, "Let's Make Them Cognitive! Cognitive Radio Technology Applied to Professional Wireless Microphone Systems", IEEE Microwave Magazine, vol. 17, iss. 1, pp. 70-78, 2016. [Bibtex]
    @article{kloc2016,
    author  = {Kloc, Matej and Rieß, Steffen and Brendel, Johannes and Linz, Sarah and Gardill, Markus and Weigel, Robert and Fischer, Georg},
    title  = {Let's Make Them Cognitive! Cognitive Radio Technology Applied to Professional Wireless Microphone Systems},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2016},
    month  = {01},
    pages  = {70--78},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2015.2487922},
    publisher  = {IEEE},
    volume  = {17},
    number  = {1},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1740},
    }
  • [DOI] G. Vinci and A. Koelpin, "Progress of Six-Port technology for industrial radar applications" in Wireless Sensors and Sensor Networks (WiSNet), 2016 IEEE Topical Conference on, 2016, pp. 48-51. [Bibtex]
    @inproceedings{vinci2016,
    author  = {Vinci, Gabor and Koelpin, Alexander},
    title  = {Progress of Six-Port technology for industrial radar applications},
    booktitle  = {{Wireless Sensors and Sensor Networks (WiSNet), 2016 IEEE Topical Conference on}},
    year  = {2016},
    month  = {01},
    pages  = {48--51},
    issn  = {2332-5615},
    doi  = {10.1109/WISNET.2016.7444319},
    location  = {Austin, TX, USA},
    publisher  = {IEEE},
    keywords  = {Six-Port,Radar},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1915},
    abstract  = {Six-Port receivers are well-known in the microwave test and measurement community since decades. The basic network topology has been implemented for simple reflectometer applications as well as complex network analysis. In the last decade however, a new application area for this receiver technology has been explored: Radar. Year after year new applications have been covered by radar systems taking benefit of the complex additive mixing technique of Six-Port receivers. Especially, innovative radar measurement solutions for industrial applications have been addressed by developing new hardware based on this receiver topology. In this paper, an overview of Six-Port technology will be given focusing on industrial applications that benefit from this receiver technique, the advantages as well as the drawbacks of this technology.},
    }
  • A. El Assaad, M. Krug, and G. Fischer, "Vehicle Self-Localization for Advanced Driver Assistance Systems" in WPNC’2016 IEEE 13th Workshop on Positioning, Navigation and Communications, 2016. [Bibtex]
    @inproceedings{assaad2016d,
    author  = {El Assaad, Ahmad and Krug, Markus and Fischer, Georg},
    title  = {Vehicle Self-Localization for Advanced Driver Assistance Systems},
    booktitle  = {{WPNC’2016 IEEE 13th Workshop on Positioning, Navigation and Communications}},
    year  = {2016},
    month  = {01},
    day  = {10},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1877},
    }
  • [DOI] M. Trautmann, C. Joffe, F. Pflaum, B. Sanftl, R. Weigel, T. Heckel, and A. Koelpin, "Implementation of Simultaneous Energy and Data Transfer in a Contactless Connector" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016, pp. 101-104. [Bibtex]
    @inproceedings{trautmann2016,
    author  = {Trautmann, Martin and Joffe, Christopher and Pflaum, Felix and Sanftl, Benedikt and Weigel, Robert and Heckel, Thomas and Koelpin, Alexander},
    title  = {Implementation of Simultaneous Energy and Data Transfer in a Contactless Connector},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    pages  = {101--104},
    doi  = {10.1109/WISNET.2016.7444333},
    location  = {Austin, USA},
    keywords  = {data transfer,inductive power transmission,plugs,power filters,wireless communication},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1715},
    abstract  = {This paper presents a contactless, near field energy and data transfer system, which uses one common pair of coils for both transmission purposes. As exemplary target application a contactless connector for harsh environment is shown, but the concept can be adapted to several other applications. The challenge is to transmit the data simultaneously to a high energy signal. The system concept, simulation as well as measurement results of a hardware demonstrator will be presented in this paper. It will be shown that a robust data transmission system can be realized featuring superior SNR and nearly noise free operation even with a simultaneous energy transfer of several kilowatt.},
    }
  • [DOI] C. Will, K. Shi, F. Lurz, R. Weigel, and A. Koelpin, "Instantaneous Heartbeat Detection using a Cross-Correlation based Template Matching for Continuous Wave Radar Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016, pp. 31-34. [Bibtex]
    @inproceedings{will2016,
    author  = {Will, Christoph and Shi, Kilin and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    title  = {Instantaneous Heartbeat Detection using a Cross-Correlation based Template Matching for Continuous Wave Radar Systems},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    pages  = {31--34},
    doi  = {10.1109/WISNET.2016.7444314},
    location  = {Austin, Texas, United States of America},
    publisher  = {IEEE},
    keywords  = {Radar interferometry,Biomedical signal processing,Template matching},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1712},
    abstract  = {Instantaneous heartbeat detection is necessary for an optimal patient monitoring in healthcare centers. Whereas electrocardiogram (ECG) and ballistocardiogram (BCG), for instance, are established methods for real time monitoring nowadays, contact-free systems are appreciated. Herewith, a 24 GHz continuous wave (CW) radar system with an intelligent signal processing is presented. Common heartbeat detection algorithms use the fast Fourier transform (FFT), and therefore require an adequate observation time window and rather detect an averaged heart rate. The proposed algorithm in contrast accomplishes the detection of single heart beats directly in the time domain with an insignificant delay. The core of that algorithm is a template matching using the cross-correlation method. In this paper, after describing the radar system with the novel signal processing, the presented system is compared to a commercial ECG product.},
    }
  • D. Fey, M. Reichenbach, C. Söll, and R. Weigel, "Evaluating Signed-digit Arithmetic Circuits using Multi-level storing Memristors" in HIPEAC Workshop on Memristor Technology, Design, Automation and Computing, 2016, pp. 1-6. [Bibtex]
    @inproceedings{fey2016,
    author  = {Fey, Dietmar and Reichenbach, Marc and Söll, Christopher and Weigel, Robert},
    title  = {Evaluating Signed-digit Arithmetic Circuits using Multi-level storing Memristors},
    booktitle  = {{HIPEAC Workshop on Memristor Technology, Design, Automation and Computing}},
    year  = {2016},
    month  = {01},
    pages  = {1--6},
    location  = {Prague},
    keywords  = {Memristor,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1765},
    abstract  = {Signed-digit (SD) arithmetic, e.g. ternary computer arithmetic circuits process trits instead of bits. It is long known that trits, which are using for each digit not only 0 and 1but in addition either 2 or -1, can carry out an addition in a constant number of steps independent of the used word length of the operands. However, corresponding SD arithmetic circuits have not been used in current processors so far due to the missing of fast, dense and CMOS compatible memory cells that can store reliably multiple levels. Memristors offer these features making necessary a re-evaluation of different SD number representations and their corresponding arithmetic circuits realized in CMOS technology. In addition appropriate analogue-to-digital (A/D) and digital-to-analogue (D/A) interfaces between digital CMOS circuits and multi-level memristors are ne-cessary and have to be considered in this investigation. The paper evaluates different SD number represen-tations using digits with three or five levels for the adder. It is concluded that an SD addition using trits and three elementary processing steps is currently the best solution for memristors. This solution is currently implemented in a first hardware demonstrator using commercially available memristor devices, discretely realised A/D and D/A converters which link the memristor registers to an FPGA implementing the SD arithmetic.},
    }
  • [DOI] M. Hierold, M. Hartmann, S. Ripperger, F. Mayer, A. Heuberger, R. Weigel, and A. Koelpin, "Low-weight Wireless Sensor Node for Animal Encounter Detection and Dual-band Localization" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016. [Bibtex]
    @inproceedings{hierold2016,
    author  = {Hierold, Martin and Hartmann, Markus and Ripperger, Simon and Mayer, Frieder and Heuberger, Albert and Weigel, Robert and Koelpin, Alexander},
    title  = {Low-weight Wireless Sensor Node for Animal Encounter Detection and Dual-band Localization},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    doi  = {10.1109/WISNET.2016.7444311},
    location  = {Austin, Texas, USA},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1724},
    abstract  = {In this paper the feasibility of encounter detection and simultaneous localization of bats in their natural habitat is emonstrated. Furthermore a compact design of an enhanced mobile node exhibiting a eight of only 1.85 g is presented. The new design allows for an increased robustness of the localization by implementing dual-band signal transmission at 2.4GHz and in the sub-gigahertz range. The prolongation of operation time up to 14 days and beyond is discussed in detail.},
    }
  • [DOI] S. Mann, F. Lurz, S. Linz, S. Lindner, C. Will, S. Wibbing, R. Weigel, and A. Koelpin, "Substrate Integrated Waveguide Fed Antenna for 61 GHz Ultra-Short-Range Interferometric Radar Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016, pp. 64-66. [Bibtex]
    @inproceedings{mann2016,
    author  = {Mann, Sebastian and Lurz, Fabian and Linz, Sarah and Lindner, Stefan and Will, Christoph and Wibbing, Sascha and Weigel, Robert and Koelpin, Alexander},
    title  = {Substrate Integrated Waveguide Fed Antenna for 61 GHz Ultra-Short-Range Interferometric Radar Systems},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    pages  = {64--66},
    doi  = {10.1109/WISNET.2016.7444323},
    location  = {Austin, Texas},
    publisher  = {IEEE MTT-S},
    keywords  = {Interferometer,Six-Port,RADAR,phase measurement,nearfield sensor,millimeter-wave},
    volume  = {64},
    number  = {66},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1720},
    abstract  = {Radar sensors play a key role in today’s indus- trial automation. Being an alternative to frequency modulated continuous wave radar, Six-Port based radar sensors recently attracted the interest of the community as well as of the industry. This paper presents a 61 GHz Six-Port radar sensor for ultra-short range applications and a dedicated substrate integrate waveguide fed tapered slot antenna design. Due to an optimized design, the antenna allows for measurements in the direct near-zone of 0 mm to 10 mm without ambiguity effects. Making use of a spiral fitting operation, the presented measurement results show an absolute distance error of less than 100 μm.},
    }
  • [DOI] F. Lurz, C. Dorn, S. Lindner, S. Linz, S. Mann, R. Weigel, and A. Koelpin, "Digital Phase Correction for Multiplexed ADCs in Low-Cost Six-Port Interferometers" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016, pp. 56-59. [Bibtex]
    @inproceedings{lurz2016,
    author  = {Lurz, Fabian and Dorn, Christian and Lindner, Stefan and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Digital Phase Correction for Multiplexed ADCs in Low-Cost Six-Port Interferometers},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    pages  = {56--59},
    doi  = {10.1109/WISNET.2016.7444321},
    location  = {Austin, Texas},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1722},
    }
  • [DOI] M. Kloc, N. Franchi, M. Gardill, and R. Weigel, "Low Latency Evaluation of an Adaptive Industrial Wireless Communications System for ISM Bands" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016, pp. 7-10. [Bibtex]
    @inproceedings{kloc2016a,
    author  = {Kloc, Matej and Franchi, Norman and Gardill, Markus and Weigel, Robert},
    title  = {Low Latency Evaluation of an Adaptive Industrial Wireless Communications System for ISM Bands},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    pages  = {7--10},
    issn  = {2332-5615},
    doi  = {10.1109/WISNET.2016.7444307},
    location  = {Austin, Texas (USA)},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1730},
    abstract  = {Low latency and highest transmission reliability are the key challenges for enabling time-critical industrial wireless applications, e.g. in factory automation. Both are significantly determined by the rough and dynamic environmental conditions as well as regulatory limitation of spectrum access in unlicensed frequency bands, especially in the 2.4 GHz industrial, scientific and medical (ISM) band. In order to get these influences under control, a novel concept for an adaptive and low latency (≤ 1 ms) industrial wireless communications (IWC) system that adopts a robust IEEE 802.11p physical layer (PHY) is proposed and evaluated. Based on representative coexistence measurements in a real environment, the results of extensive simulations and analysis are shown in order to evaluate achievable latencies.},
    }
  • [DOI] K. Staszek, S. Linz, F. Lurz, S. Mann, R. Weigel, and A. Koelpin, "Improved Calibration Procedure for Six-Port Based Precise Displacement Measurements" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2016, pp. 60-63. [Bibtex]
    @inproceedings{staszek2016,
    author  = {Staszek, Kamil and Linz, Sarah and Lurz, Fabian and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Improved Calibration Procedure for Six-Port Based Precise Displacement Measurements},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2016},
    month  = {01},
    pages  = {60--63},
    doi  = {10.1109/WISNET.2016.7444322},
    location  = {Austin, Texas},
    publisher  = {IEEE MTT-S},
    keywords  = {six-port,reflectometer,radar,calibration,technique,displacement measurements},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1721},
    abstract  = {In this paper an improved calibration procedure for six-port based displacement measurement radar is proposed. The entire system characterizati on is done only using several measurements of the target at kn own positions and no additional calibration standards a re required. The proposed calibration has been experim entally verified for a six-port based displacement measurem ent radar operating at 24 GHz. The performed measurements within the target position range 0 – 18.75 mm prove a significant to the other reported algorithms.},
    }
  • [DOI] D. Krause, W. John, and R. Weigel, "Investigations on the Magnetic Field Coupling of Automotive High Voltage Systems to Determine Relevant Parameters for an EMR-optimized Designing", ARS Journal Kleinheubacher Berichte, pp. 269-278, 2016. [Bibtex]
    @article{krause2014,
    author  = {Krause, David and John, Werner and Weigel, Robert},
    title  = {Investigations on the Magnetic Field Coupling of Automotive High Voltage Systems to Determine Relevant Parameters for an EMR-optimized Designing},
    journal  = {{ARS Journal Kleinheubacher Berichte}},
    year  = {2016},
    pages  = {269--278},
    doi  = {10.5194/ars-13-269-2016},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1893},
    }
  • [DOI] F. Xie, R. Weiß, and R. Weigel, "Hysteresis Compensation Method for Magnetoresistive (MR) Sensors Based on Single Polar Controlled Magnetic Field Pulses", IEEE Transactions on Industrial Electronics, iss. 12, pp. 7804-7809, 2016. [Bibtex]
    @article{xie2016,
    author  = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    title  = {Hysteresis Compensation Method for Magnetoresistive (MR) Sensors Based on Single Polar Controlled Magnetic Field Pulses},
    journal  = {{IEEE Transactions on Industrial Electronics}},
    year  = {2016},
    pages  = {7804--7809},
    doi  = {10.1109/TIE.2016.2598520},
    edition  = {62},
    number  = {12},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1868},
    }
  • H. Bischl, C. Fuchs, M. Geissler, D. Giggenbach, M. Hein, A. Jacob, R. Jakoby, I. Kallfass, D. Kissinger, S. Martin, J. Müller, H. Petry, R. Wansch, R. Weigel, I. Wolff, and V. Ziegler, "Die Zukunft der Satellitenkommunikation", pp. 1-56, 2016. [Bibtex]
    @other{bischl2016,
    author  = {Bischl, Hermann and Fuchs, Christian and Geissler, Matthias and Giggenbach, Dirk and Hein, Matthias and Jacob, Arne and Jakoby, Rolf and Kallfass, Ingmar and Kissinger, Dietmar and Martin, Siegbert and Müller, Jens and Petry, Hans-Peter and Wansch, Rainer and Weigel, Robert and Wolff, Ingo and Ziegler, Volker},
    title  = {Die Zukunft der Satellitenkommunikation},
    booktitle  = {{Weissbuch der ITG im VDE}},
    year  = {2016},
    pages  = {1--56},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1902},
    }
  • R. Löhr, F. Ohnhäuser, J. Röber, and R. Weigel, "Switch Bootstrapping in a 1.5 Bit Pipeline Stage" in Analog2016, 2016, pp. 49-52. [Bibtex]
    @inproceedings{loehr2016,
    author  = {Löhr, Robert and Ohnhäuser, Frank and Röber, Jürgen and Weigel, Robert},
    title  = {Switch Bootstrapping in a 1.5 Bit Pipeline Stage},
    booktitle  = {{Analog2016}},
    year  = {2016},
    pages  = {49--52},
    location  = {Bremen},
    keywords  = {1.5 bit, switch bootstrapping, MDAC, charge injection, external reference, non-linearity},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1876},
    abstract  = {The targeted 16 bit pipeline converter has an adjustable sampling frequency from 100MHz to 200MHz. In this paper the switches for the input and the reference voltage sampling are analyzed. Therefore, a novel switch bootstrapping technique is presented, which guarantees a worst case input voltage settling accuracy of LSB 2 at settling times between 2 ns to 5 ns. The non-linearity caused by the input switches is simulated and typically amounts to -115 dB. In addition a possible solution for external reference voltage settling is introduced.},
    }
  • T. Girg, D. Schrüfer, M. Dietz, A. Hagelauer, D. Kissinger, and R. Weigel, "Low Complexity 60-GHz Receiver Architecture for Simultaneous Phase and Amplitude Regenerative Sampling Systems" in International Symposium on Integrated Circuits, 2016, pp. 1-4 (to be published). [Bibtex]
    @inproceedings{girg2016a,
    author  = {Girg, Thomas and Schrüfer, Daniel and Dietz, Marco and Hagelauer, Amelie and Kissinger, Dietmar and Weigel, Robert},
    title  = {Low Complexity 60-GHz Receiver Architecture for Simultaneous Phase and Amplitude Regenerative Sampling Systems},
    booktitle  = {{International Symposium on Integrated Circuits}},
    year  = {2016},
    pages  = {1--4},
    location  = {Singapur},
    publisher  = {Thomas GIrg},
    keywords  = {SiGe,BiCMOS,simultaneous phase and amplitude regenrative sampling,high data rate,communication,self-mixing},
    note  = {accepted},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1907},
    abstract  = {With increasing data rates in communication systems, the call for wideband transceiver solutions capable of processing complex modulation schemes is getting stronger. Unfortunately, this goes along with power hungry systems and more complex integrated circuits. A novel receiver architecture, which addresses these issues, is based on the simultaneous phase and amplitude regenerative sampling system. Its system exploits switched injection-locked oscillators and their capability to regenerate signals with a gain of over 40dB. This paper demonstrates an integrated solution for phase demodulation in such an architecture. The proposed concept uses the low complex but efficient self-mixing principle and consists mainly of double-balanced Gilbert mixers, amplifiers, a delay line and passive power dividers. The detection of the phase is achieved through self-mixing the regenerated signal with one path delayed by a symbol period. The architecture achieves 2 GBaud/s with 8 th order differential phase shift keying at a frequency of 60 GHz and is realized in a 130nm SiGe BiCMOS technology.},
    }
  • [DOI] G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends", Radio Science AGU Journal - special issue "Innovative Microwave Devices, Methods and Applications", 2016. [Bibtex]
    @article{gottardo2016,
    author  = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    title  = {Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends},
    journal  = {{Radio Science AGU Journal - special issue "Innovative Microwave Devices, Methods and Applications"}},
    year  = {2016},
    issn  = {1944-799x},
    doi  = {10.1002/2016RS005969},
    publisher  = {AGU Journal - Wiley online Journal},
    keywords  = {active filter,feedback amplifier,base station,stability analysis,interference suppression,band-pass filters},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1792},
    abstract  = {Duplex filters in modern base transceiver stations (BTS) provides the channel shape in order to perform common frequency division duplex (FDD) operation. Usually they are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. This solution provides the shaping of the signal spectrum directly at the output of the radio frequency (RF) power amplifiers (PAs) relaxing the transmitter design especially in the duplexer and the antenna sections. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. A model to describe the hybrid system is investigated and the relation between phase and resonance peaks in the resulting periodic band-pass transfer function is described. The stability condition of the system is analyzed using Nyquist criterion and defining a safe work region in order to avoid oscillation. A solution involving a number of digital feedback and forward branches is investigated defining recursive structure parameters of the hybrid filter. This last solution allows the closed loop system to show at the output of the RF amplifier a periodic band-pass with up to 500 KHz bandwidth. Moreover, the band-pass magnitude reaches up to 17 dB difference between maximum gain and attenuation.},
    }
  • [DOI] L. Shi, C. Söll, B. Pfundt, A. Bänisch, M. Reichenbach, J. Seiler, T. Ußmüller, and R. Weigel, "A Flexible Mixed-Signal Image Processing Pipeline using 3D Chip Stacks", Journal of Real-Time Image Processing, 2016. [Bibtex]
    @article{shi2015,
    author  = {Shi, Lan and Söll, Christopher and Pfundt, Benjamin and Bänisch, Andreas and Reichenbach, Marc and Seiler, Jürgen and Ußmüller, Thomas and Weigel, Robert},
    title  = {A Flexible Mixed-Signal Image Processing Pipeline using 3D Chip Stacks},
    journal  = {{Journal of Real-Time Image Processing}},
    year  = {2016},
    issn  = {1861-8219},
    doi  = {10.1007/s11554-016-0628-5},
    publisher  = {Springer-Verlag},
    keywords  = {Smart Camera,Analog Pre-Processing,Application Optimized Image Pipeline,3D Chip Stacking,Partitioning},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1698},
    abstract  = {This work presents a highly exible mixedsignal CMOS image sensor suitable for smart camera applications. These systems need to fit different constraints regarding power consumption, speed and quality, and the optimal compromise may differ depending on the application. Moreover, the best implementation of a desired image processing task may be in the analog or the digital domain, or even a combined computation. Every aspect starting from the image sensor and signal acquisition up to the pre-processing in analog and digital domain are investigated in this paper to optimize not just one part of the system, but the whole system altogether. Moreoever, it is shown that analog processing algorithms can improve signal quality, processing speed and latency while being able to save power, which is important for real-time systems. In order to be able to do spatial operations, the state of the art sensor is modified to be able to readout multiple pixels at the same time. This allows analog spatial filter operations which consume significantly less power. As an example, an average filter is described whichs needs less than 5.3\% of the power-time product of a digital implementation for one computation. To enhance data throughput and flexibility, 3D chip stacking is proposed to partition the sensor in smaller units and enable massively parallel processing.},
    }
  • S. N. Easwaran, S. K. Venugopal, and R. Weigel, "Current Regulator with Energy Limitation in the Unpowered State Featuring Bipolar Discharge Path" in 2016 IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), 2016, pp. 82-85. [Bibtex]
    @inproceedings{easwaran2016,
    author  = {Easwaran, Sri Navaneeth and Venugopal, Sunil Kashyap and Weigel, Robert},
    title  = {Current Regulator with Energy Limitation in the Unpowered State Featuring Bipolar Discharge Path},
    booktitle  = {{2016 IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM)}},
    year  = {2016},
    pages  = {82--85},
    location  = {New Brunswick, NJ, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1861},
    }

2015

  • [DOI] G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends" in Mediterranean Microwave Symposium, MMS 2015, 2015, pp. 227-230. [Bibtex]
    @inproceedings{gottardo2015a,
    author  = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    title  = {Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends},
    booktitle  = {{Mediterranean Microwave Symposium, MMS 2015}},
    year  = {2015},
    month  = {12},
    day  = {01},
    pages  = {227--230},
    doi  = {10.1109/MMS.2015.7375476},
    location  = {Lecce, Italy},
    publisher  = {IEEE},
    keywords  = {active filter,feedback amplifier,base station,stability analysis,interference suppression,band-pass filters,cavity resonators},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1716},
    abstract  = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. The use of multiple digital feedback branches allows the closed loop system to show a periodic band-pass behavior at the output of the RF amplifier with a larger bandwidth up to 500 KHz. Moreover the band pass magnitude reaches up to 17 dB difference between maximum gain and attenuation.},
    }
  • [DOI] F. Müller, S. Benesch, W. Steinbuch, T. Walter, and R. Weigel, "Mitigation of Weak Targets’ Masking due to Nonlinearities in Chirp Sequence FMCW Automotive Radar at 77 GHz" in Asia-Pacific Microwave Conference (APMC2015), 2015, pp. 1-3. [Bibtex]
    @inproceedings{mueller2015d,
    author  = {Müller, Felix and Benesch, Sebastian and Steinbuch, W. and Walter, Thomas and Weigel, Robert},
    title  = {Mitigation of Weak Targets’ Masking due to Nonlinearities in Chirp Sequence FMCW Automotive Radar at 77 GHz},
    booktitle  = {{Asia-Pacific Microwave Conference (APMC2015)}},
    year  = {2015},
    month  = {12},
    pages  = {1--3},
    doi  = {10.1109/APMC.2015.7413451},
    location  = {Nanjing, China},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1755},
    }
  • C. Schmidt, M. Dietz, F. Trenz, J. Nehring, R. Weigel, and D. Kissinger, "Miniaturisierte Dehydratations-Sensorik im Leistungssport" in Fußball 4.0 - Jahrestagung der dvs-Kommission Fußball, 2015. [Bibtex]
    @inproceedings{schmidt2015,
    author  = {Schmidt, Christian and Dietz, Marco and Trenz, Florian and Nehring, Johannes and Weigel, Robert and Kissinger, Dietmar},
    title  = {Miniaturisierte Dehydratations-Sensorik im Leistungssport},
    booktitle  = {{Fußball 4.0 - Jahrestagung der dvs-Kommission Fußball}},
    year  = {2015},
    month  = {11},
    day  = {19},
    location  = {Erlangen},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1766},
    }
  • A. Gharib, R. Weigel, and D. Kissinger, "Broadband Circuit Techniques for Multi-Terahertz Gain-Bandwidth-Product Low-Power Applications", IEEE Transactions on Microwave Theory and Techniques, vol. 63, iss. 11, pp. 3701-3712, 2015. [Bibtex]
    @article{gharib2015,
    author  = {Gharib, Ahmed and Weigel, Robert and Kissinger, Dietmar},
    title  = {Broadband Circuit Techniques for Multi-Terahertz Gain-Bandwidth-Product Low-Power Applications},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2015},
    month  = {11},
    pages  = {3701--3712},
    volume  = {63},
    number  = {11},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1870},
    }
  • [DOI] R. Löhr, M. Kempf, F. Ohnhäuser, J. Röber, R. Weigel, and A. Bänisch, "Implementation of a High-Speed Flash ADC for High Performance Pipeline ADCs in an 180nm CMOS Process" in International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 2015. [Bibtex]
    @inproceedings{loehr2015,
    author  = {Löhr, Robert and Kempf, Markus and Ohnhäuser, Frank and Röber, Jürgen and Weigel, Robert and Bänisch, Andreas},
    title  = {Implementation of a High-Speed Flash ADC for High Performance Pipeline ADCs in an 180nm CMOS Process},
    booktitle  = {{International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)}},
    year  = {2015},
    month  = {11},
    doi  = {10.1109/ISPACS.2015.7432788},
    location  = {Nusa Dua, Bali},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1727},
    abstract  = {Pipeline Analog to Digital Converters (ADC) use a sub-ADC in each pipeline stage. They require a much higher sampling rate and less accuracy. For that reason Flash ADCs are predestined for sub-ADCs. In this paper a differential Flash ADC is presented for a targeted pipeline ADC with 16 Bit, 200 MS/s and a 1.5 Bit resolution per stage. The overall accuracy of the Flash ADC is 30mV and a typical propagation delay of around 400 ps is achieved. This corresponds to a sampling rate of 2.5 GS/s. In addition, a new numerical method for an effective simulation of the propagation delay and offset is presented.},
    }
  • [DOI] C. Söll, L. Shi, A. Bänisch, T. Ußmüller, and R. Weigel, "A CMOS Image Sensor with Analog Pre-Processing Capability Suitable for Smart Camera Applications" in IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 2015, pp. 279-284. [Bibtex]
    @inproceedings{soell2015b,
    author  = {Söll, Christopher and Shi, Lan and Bänisch, Andreas and Ußmüller, Thomas and Weigel, Robert},
    title  = {A CMOS Image Sensor with Analog Pre-Processing Capability Suitable for Smart Camera Applications},
    booktitle  = {{IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)}},
    year  = {2015},
    month  = {11},
    pages  = {279--284},
    doi  = {10.1109/ISPACS.2015.7432780},
    location  = {Bali, Indonesia},
    keywords  = {Smart Cameras,CMOS Image Sensors,Analog Processing Circuits,Filtering Algorithms,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1705},
    abstract  = {This work presents a novel CMOS sensor which is suitable for analog image processing operations and describes the benefits of analog pre-processing over digital algorithms. All needed modifications to read out a spatial NxN pixel matrix simultaneously are presented regarding pixel wiring, row decoder and column multiplexer as well as descrambling the order of the outputs. The outputs are connected via a buffer stage to the analog pre-processing circuits. As an example for such an analog computation, an averaging filter is described from design constraints to the actual implementation. Simulation results show a very low current consumption of just 55.3 μA under worst-case conditions and a computation time below 200 ns. This corresponds to a power-time product ratio of 1:18.75 compared to a digital state-of-the-art implementation.},
    }
  • A. Hagelauer, W. Akstaller, A. Tag, and R. Weigel, "Characterization and Modeling of Nonlinearities in BAW Components for Mobile Communications" in Sixth International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems, 2015, pp. 18-23. [Bibtex]
    @inproceedings{hagelauer2015,
    author  = {Hagelauer, Amelie and Akstaller, Wolfgang and Tag, Andreas and Weigel, Robert},
    title  = {Characterization and Modeling of Nonlinearities in BAW Components for Mobile Communications},
    booktitle  = {{Sixth International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems}},
    year  = {2015},
    month  = {11},
    pages  = {18--23},
    location  = {Chiba, Japan},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1759},
    }
  • [DOI] C. Will, K. Shi, F. Lurz, R. Weigel, and A. Koelpin, "Intelligent Signal Processing Routine for Instantaneous Heart Rate Detection using a Six-Port Microwave Interferometer" in IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 2015, pp. 483-487. [Bibtex]
    @inproceedings{will2015,
    author  = {Will, Christoph and Shi, Kilin and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    title  = {Intelligent Signal Processing Routine for Instantaneous Heart Rate Detection using a Six-Port Microwave Interferometer},
    booktitle  = {{IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)}},
    year  = {2015},
    month  = {11},
    day  = {09},
    pages  = {483--487},
    doi  = {10.1109/ISPACS.2015.7432820},
    location  = {Nusa Dua, Bali, Indonesia},
    publisher  = {IEEE},
    keywords  = {Six-Port,Interferometers,Biomedical signal processing,Heartbeat monitoring},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1711},
    abstract  = {Instantaneous heart rate detection is one of the key parameters in medical vital parameter monitoring. In medical centers e.g., real time monitoring of the vital signs of a patient under surveillance is necessary. Nowadays, the dominant technologies are electrocardiogram (ECG) or ballistocardiogram (BCG), but the required direct contact to the person-under-surveillance is a common drawback of these sensors. In this paper, a Six-Port microwave interferometer is presented and used to detect the current heart rate of a person-under-test. An intelligent signal processing routing is proposed, that avoids the fast Fourier transform (FFT) due to the implicated longsome observation window and operates directly in the time domain instead. A commercial ECG product is used to proof the reliability of the presented signal processing routine to establish Six-Port microwave interferometers for instantaneous heart rate detection.},
    }
  • T. Lenhard and A. Koelpin, "Sichere und interaktive Steuerung von Produktionsanlagen durch vernetzte Umfeldsensoren" in Mikrosystemtechnik-Kongress (MST) 2015, 2015, pp. 1-2. [Bibtex]
    @inproceedings{lenhard2015,
    author  = {Lenhard, Thilo and Koelpin, Alexander},
    title  = {Sichere und interaktive Steuerung von Produktionsanlagen durch vernetzte Umfeldsensoren},
    booktitle  = {{Mikrosystemtechnik-Kongress (MST) 2015}},
    year  = {2015},
    month  = {10},
    day  = {28},
    pages  = {1--2},
    isbn  = {978-3-8007-4100-7},
    location  = {Karlsruhe, Germany},
    publisher  = {VDE},
    keywords  = {Radar,SAR},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1713},
    abstract  = {Im Rahmen der Initiative Industrie 4.0 ist eines der Hauptthemen das dynamische Reagieren von bislang unflexiblen Produktionseinrichtungen auf wechselnde Anforderungen und Umgebungseinflüsse. In Zusammenarbeit mit der Universität Erlangen-Nürnberg und den Industriepartnern Siemens CT und Schnaithmann GmbH entwickelt die InnoSenT GmbH ein cyber-physisches Sensorsystem, das alle Distanzinformationen liefert, um in Echtzeit eine Interaktion zwischen Mensch und Maschine oder zwischen mehreren Maschinen zu ermöglichen [1]. Basis des Sensorkonzeptes ist ein universeller interferometrischer Radarsensor mit konfigurierbarer Antenne und einer Messgenauigkeit im Sub-mm-Bereich. Die Arbeiten beinhalten die Entwicklung einer speziellen integrierten Schaltung (MMIC) und neuartiger Packaging-Konzepte.},
    }
  • M. Kloc, N. Franchi, M. Gardill, and R. Weigel, "Cognitive Multi-Radio as Enabler for Deterministic Dynamic Spectrum Access" in Wireless Innovation Forum European Conference on Communication Technologies and Software Defined Radio (WInnComm-Europe), 2015. [Bibtex]
    @inproceedings{kloc2015,
    author  = {Kloc, Matej and Franchi, Norman and Gardill, Markus and Weigel, Robert},
    title  = {Cognitive Multi-Radio as Enabler for Deterministic Dynamic Spectrum Access},
    booktitle  = {{Wireless Innovation Forum European Conference on Communication Technologies and Software Defined Radio (WInnComm-Europe)}},
    year  = {2015},
    month  = {10},
    location  = {Erlangen},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1725},
    abstract  = {Cognitive radio (CR) is a promising approach to enable dynamic spectrum access (DSA) and to handle spectral efficiency in licensed frequency bands. In this presentation, two new concepts, called cognitive multi-radio (CMR) and deterministic dynamic spectrum access (D-DSA), are introduced. These concepts help to increase the spectrum agility and hence to improve the deterministic broadband spectrum access in unlicensed industrial, medical and scientific (ISM) bands, where shared spectrum lead to interferences and/or collisions, which consequently degrade transmission performance. Here, the CMR-based D-DSA approach is discussed in context with industrial wireless communications (IWC), where a real-time capable transmission behavior with high determinism, high reliability and low-latency (round-trip latency budget ≤ 1 ms) is required. In addition, a CMR hardware architecture, which is based on the software-defined radio (SDR) principle, is proposed.},
    }
  • [DOI] F. Müller, D. Steinbuch, M. Steinhauer, T. Walter, and R. Weigel, "Defining Acceptable Phase-Modulated Nonlinearities in 77 GHz FMCW Automotive Radar Systems" in International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC), 2015. [Bibtex]
    @inproceedings{mueller2015c,
    author  = {Müller, Felix and Steinbuch, Dirk and Steinhauer, Matthias and Walter, Thomas and Weigel, Robert},
    title  = {Defining Acceptable Phase-Modulated Nonlinearities in 77 GHz FMCW Automotive Radar Systems},
    booktitle  = {{International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC)}},
    year  = {2015},
    month  = {10},
    doi  = {10.1109/INMMIC.2015.7330384},
    location  = {Taormina, Italy},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1753},
    }
  • [DOI] A. Tag, V. Chauhan, R. Weigel, A. Hagelauer, B. Bader, C. Huck, M. Pitschi, and D. Karolewski, "Multiphysics Modeling of BAW Filter" in IEEE International Ultrasonics Symposium, 2015, pp. 1-4. [Bibtex]
    @inproceedings{tag2016a,
    author  = {Tag, Andreas and Chauhan, Vikrant and Weigel, Robert and Hagelauer, Amelie and Bader, Bernhard and Huck, Christian and Pitschi, Maximilian and Karolewski, Dominik},
    title  = {Multiphysics Modeling of BAW Filter},
    booktitle  = {{IEEE International Ultrasonics Symposium}},
    year  = {2015},
    month  = {10},
    pages  = {1--4},
    doi  = {10.1109/ULTSYM.2015.0115},
    location  = {Taipei, Taiwan},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1881},
    }
  • [DOI] A. Tag, B. Bader, C. Huck, D. Karolewski, M. Pitschi, R. Weigel, and A. Hagelauer, "Impact of Spatial Distribution of Dissipated Power to Modeling of SMR BAW Resonators at High Power Levels", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 62, iss. 10, pp. 1856-1864, 2015. [Bibtex]
    @article{tag2015b,
    author  = {Tag, Andreas and Bader, Bernhard and Huck, Christian and Karolewski, Dominik and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    title  = {Impact of Spatial Distribution of Dissipated Power to Modeling of SMR BAW Resonators at High Power Levels},
    journal  = {{IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control}},
    year  = {2015},
    month  = {10},
    pages  = {1856--1864},
    issn  = {0885-3010},
    doi  = {10.1109/TUFFC.2015.007036},
    publisher  = {IEEE},
    volume  = {62},
    number  = {10},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1760},
    }
  • A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "Modellierung nass-chemischer Porosizierverahren auf LTCC für elektromagnetische Hochfrequenz Feldsimulation" in Mikrosystemtechnik Kongress (MST) 2015, 2015, pp. 396-399. [Bibtex]
    @inproceedings{talai2015c,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {Modellierung nass-chemischer Porosizierverahren auf LTCC für elektromagnetische Hochfrequenz Feldsimulation},
    booktitle  = {{Mikrosystemtechnik Kongress (MST) 2015}},
    year  = {2015},
    month  = {10},
    pages  = {396--399},
    location  = {Karlsruhe, Germany},
    keywords  = {LTCC},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1644},
    }
  • F. Lurz, S. Mann, S. Linz, S. Lindner, R. Weigel, and A. Koelpin, "System- und Schaltungskonzepte für Low-Power-Radarsensorik zur Anwesenheitsdetektion" in Mikrosystemtechnik-Kongress (MST) 2015, 2015, pp. 274-277. [Bibtex]
    @inproceedings{lurz2015b,
    author  = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {System- und Schaltungskonzepte für Low-Power-Radarsensorik zur Anwesenheitsdetektion},
    booktitle  = {{Mikrosystemtechnik-Kongress (MST) 2015}},
    year  = {2015},
    month  = {10},
    pages  = {274--277},
    isbn  = {978-3-8007-4100-7},
    location  = {Karlsruhe, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1645},
    }
  • F. Lurz, S. Mann, S. Linz, S. Lindner, R. Weigel, and A. Koelpin, "LabVIEW basierte Echtzeit-Signalverarbeitung für Low-Power-Radarsensorik," in Virtuelle Instrumente in der Praxis 2015, R. Jamal and R. Heinze, Eds., VDE-Verlag, 2015, pp. 245-248. [Bibtex]
    @inbook{lurz2015a,
    author  = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    editor  = {Jamal, Rahman and Heinze, R.},
    title  = {LabVIEW basierte Echtzeit-Signalverarbeitung für Low-Power-Radarsensorik},
    booktitle  = {{Virtuelle Instrumente in der Praxis 2015}},
    year  = {2015},
    month  = {10},
    pages  = {245--248},
    isbn  = {978-3-8007-3669-0},
    location  = {Berlin, Offenbach},
    publisher  = {VDE-Verlag},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1747},
    abstract  = {Hochfrequenz-Radarsensoren haben sich in letzter Zeit als eine vielversprechende Alternative zu herkömmlichen Anwesenheitssensoren wie Passiv-Infrarot oder Ultraschall bewährt. Aufgrund ihrer hohen Ortsauflösung können Radarsysteme eine drahtlose Detektion von Vitalparametern, wie Herzschlag oder Atmung, durchführen und so auch sich nicht bewegende Personen detektieren. Dieses Dokument beschreibt die LabVIEW basierte Signalverarbeitung für ein 24 GHz Low-Power-Radarsystem. Für eine effiziente Evaluierung der Detektionsalgorithmen müssen diese unter weichen Echtzeitbedingungen ausgeführt werden, um ein verzögerungsfreies und flüssiges Feedback der graphischen Oberfläche zu erhalten.},
    }
  • M. Gardill, S. Linz, G. Fischer, and R. Weigel, "Praktikumsversuch CW/FMCW-Radar auf Basis von myRIO," in Virtuelle Instrumente in der Praxis 2015, R. Jamal and R. Heinze, Eds., VDE-Verlag, 2015, pp. 376-382. [Bibtex]
    @inbook{gardill2015,
    author  = {Gardill, Markus and Linz, Sarah and Fischer, Georg and Weigel, Robert},
    editor  = {Jamal, Rahman and Heinze, R.},
    title  = {Praktikumsversuch CW/FMCW-Radar auf Basis von myRIO},
    booktitle  = {{Virtuelle Instrumente in der Praxis 2015}},
    year  = {2015},
    month  = {10},
    pages  = {376--382},
    isbn  = {978-3-8007-3669-0},
    location  = {Berlin, Offenbach},
    publisher  = {VDE-Verlag},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1746},
    abstract  = {Im Rahmen der Akademischen Bildungsinitiative zur Elektromobilität Bayern – Sachsen, gefördert durch die Initiative Schaufenster Elektromobilität der Bundesregierung, ist an der FAU Erlangen-Nürnberg ein neuer Praktikumsversuch zum Thema drahtlose Automobilelektronik entstanden. Im Rahmen dieses Praktikumsversuchs entwicklen und evaluieren die Studierenden ein CW/FMCW Radarsystem bei 24GHz. Das Radarsystem besteht dabei lediglich aus zwei Hardwarekomponenten: einem industriellen low-cost Radar Frontend sowie der National Instruments myRIO Plattform, es sind keine weiteren Hardwarekomponen-ten notwendig. In diesem Beitrag wird gezeigt, wie die myRIO Plattform in diesem Praktikumsversuch eingesetzt wird und wie mit myRIO somit kostengünstig ein technisch anspruchsvoller Versuch im Bereich der Mikrowellentechnik realisiert wird.},
    }
  • [DOI] A. Bittner, F. Steinhäußer, A. Talai, A. Koelpin, R. Weigel, T. Rittweg, D. Schwanke, G. Sandulache, W. Hansal, and U. Schmid, "Poröses LTCC als Substratmaterial für Höchstfrequenzradarsensoren" in Mikrosystemtechnik Kongress (MST) 2015, 2015, pp. 258-261. [Bibtex]
    @inproceedings{bittner2015,
    author  = {Bittner, Achim and Steinhäußer, Frank and Talai, Armin and Koelpin, Alexander and Weigel, Robert and Rittweg, Thomas and Schwanke, Dieter and Sandulache, Gabriela and Hansal, Wolfgang and Schmid, Ulrich},
    title  = {Poröses LTCC als Substratmaterial für Höchstfrequenzradarsensoren},
    booktitle  = {{Mikrosystemtechnik Kongress (MST) 2015}},
    year  = {2015},
    month  = {10},
    pages  = {258--261},
    doi  = {10.1109/ICEAA.2011.6046404},
    location  = {Karlsruhe, Germany},
    publisher  = {IEEE},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1646},
    }
  • G. Fischer, J. Brendel, and S. Rieß, "Cognitive PMSE for Spectrum Sharing at UHF" in Wireless Innovation Forum (SDR Forum Version 2.0), Conference on Communication Technologies and Software Defined Radio WINCOMM, 2015. [Bibtex]
    @inproceedings{fischer2015a,
    author  = {Fischer, Georg and Brendel, Johannes and Rieß, Steffen},
    title  = {Cognitive PMSE for Spectrum Sharing at UHF},
    booktitle  = {{Wireless Innovation Forum (SDR Forum Version 2.0), Conference on Communication Technologies and Software Defined Radio WINCOMM}},
    year  = {2015},
    month  = {09},
    day  = {06},
    location  = {Erlangen-Tennenlohe, FhG IIS},
    publisher  = {Wireless Innovation Forum},
    keywords  = {SDR,PMSE,C-PMSE,CR,UHF},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1735},
    abstract  = {This talk reports about work in ETSI STF386 pre-standardisation and a German national Research Project by BMWI named C-PMSE dealing with cognitive interference management to allow for coexistance of PMSE, DVB-T and LTE at UHF Band.},
    }
  • [DOI] C. Erhart, S. Lutz, J. Köhler, H. Mantz, T. Walter, and R. Weigel, "Surface velocity estimation of uids using millimetre-wave radar" in European Microwave Week 2015, 2015, pp. 566-569. [Bibtex]
    @inproceedings{erhart2015a,
    author  = {Erhart, Christian and Lutz, Steffen and Köhler, Johannes and Mantz, Hubert and Walter, Thomas and Weigel, Robert},
    title  = {Surface velocity estimation of uids using millimetre-wave radar},
    booktitle  = {{European Microwave Week 2015}},
    year  = {2015},
    month  = {09},
    pages  = {566--569},
    doi  = {10.1109/EuMC.2015.7345826},
    location  = {Paris, France},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1656},
    abstract  = {This paper presents a microwave sensor which allows to measure the surface velocity of uids via determining the Doppler shift of the scattered signal. The design of the sensor follows a modular system. Thus the antenna as well as the ampli er can be exchanged easily. Measurements in industrial as well as in natural environments with di erent antennas will be shown. An extended focus will be on the development of a dielectrical waveguide antenna for near distance measurements in industrial environments. Dependency of the signal strength on the angle of polarisation will be investigated and an approach to estimate the velocity from the measured data will be introduced.},
    }
  • F. Müller, D. Steinbuch, T. Walter, and R. Weigel, "Modellierung und Simulation von Einschwingvorgängen bei Automobilradaren" in Kleinheubacher Tagung 2015, 2015. [Bibtex]
    @inproceedings{mueller2015b,
    author  = {Müller, Felix and Steinbuch, Dirk and Walter, Thomas and Weigel, Robert},
    title  = {Modellierung und Simulation von Einschwingvorgängen bei Automobilradaren},
    booktitle  = {{Kleinheubacher Tagung 2015}},
    year  = {2015},
    month  = {09},
    location  = {Miltenberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1752},
    }
  • [DOI] F. Trenz, M. Hofmann, R. Weigel, and D. Kissinger, "A Broadband 3-29 GHz Reflectometer with a Frequency Compensated Multilayer Sixport Structure" in 2015 European Microwave Week, 2015. [Bibtex]
    @inproceedings{trenz2015,
    author  = {Trenz, Florian and Hofmann, Maximilian and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Broadband 3-29 GHz Reflectometer with a Frequency Compensated Multilayer Sixport Structure},
    booktitle  = {{2015 European Microwave Week}},
    year  = {2015},
    month  = {09},
    doi  = {10.1109/EuMC.2015.7345765},
    location  = {Paris, France},
    publisher  = {IEEE},
    keywords  = {Reflectometry,sixport,Microwave circuits,broadband},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1653},
    abstract  = {In this paper, a planar broadband sixport reflectometer structure is presented. A frequency range from 3 to 29 GHz could be achieved by merging broadband components into a single multilayer pcb stackup with an area of 66x55 mm2 . The reflectometric architecture used herein allows a frequency independent q-point configuration of the sixport by implementing microstrip linelength compensation. Broadband matching of around -10 dB could be reached at all ports in a frequency range from 1 to 30 GHz. Acceptable coupling from DUT port to measurement output could be reached in a range from 2 to 29 GHz. Frequency compensation of the structure and an optimal q-point constellation of 120-120-120 have been verified by measurement. Due to its broadband functionality, compactness and cost efficiency, the proposed system is suitable for a wide range of microwave measurement applications.},
    }
  • C. Lindner, C. Söll, J. Röber, A. Bänisch, and R. Weigel, "Yield Analysation and Optimization Methods for Active CMOS Pixels" in 8. GMM/ITG/GI-Fachtagung Zuverlässigkeit und Entwurf (ZuE), 2015, pp. 107-114. [Bibtex]
    @inproceedings{lindner2015b,
    author  = {Lindner, Claus and Söll, Christopher and Röber, Jürgen and Bänisch, Andreas and Weigel, Robert},
    title  = {Yield Analysation and Optimization Methods for Active CMOS Pixels},
    booktitle  = {{8. GMM/ITG/GI-Fachtagung Zuverlässigkeit und Entwurf (ZuE)}},
    year  = {2015},
    month  = {09},
    pages  = {107--114},
    isbn  = {978-3-8007-4071-0},
    location  = {Siegen, Germany},
    keywords  = {Yield Analysis,Active Cmos Pixel,Image Sensor,Correlated Double Sampling,Double Sampling,Simulation Method,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1696},
    abstract  = {This work explains how to simulate error sources in image sensors to analyze yield. Moreover, two circuitry-wise methods to reduce these interferences are proposed and their influences on yield and standard deviation caused by process variations and reset noise are analyzed. Thereby the biggest sources of interference within the pixel architectures are described. After comparing three different pixel architectures, their extracted layout is simulated and the results are compared. Especially the change of the yield and the standard deviation with and without the use of DS and CDS are analyzed. By applying the methods mentioned before the yield could be increased by up to 15.6 \%.},
    }
  • [DOI] F. Trenz, V. Kalpen, R. Weigel, and D. Kissinger, "Modeling and Measurement of a Tissue-Equivalent Liquid for Noninvasive Dehydration Sensing in the 2.45 GHz ISM-Band" in IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications(IMWS-Bio 2015), 2015. [Bibtex]
    @inproceedings{trenz2015a,
    author  = {Trenz, Florian and Kalpen, Victoria and Weigel, Robert and Kissinger, Dietmar},
    title  = {Modeling and Measurement of a Tissue-Equivalent Liquid for Noninvasive Dehydration Sensing in the 2.45 GHz ISM-Band},
    booktitle  = {{IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications(IMWS-Bio 2015)}},
    year  = {2015},
    month  = {09},
    doi  = {10.1109/IMWS-BIO.2015.7303761},
    location  = {Taipei, Taiwan},
    keywords  = {Biomedical measurement,Biomedical monitoring,Biological system modeling,Microwave sensors,Biosensors,Phantoms},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1706},
    abstract  = {In this paper, a blood-equivalent liquid is presented. The phantom material at room temperature is a valid representation of blood at body temperature in the frequency range from 2 to 3 GHz with an maximum deviation of ±1.5 in eps1 and ±2.8 in eps2 . The effect of a hypertonic variation of the plasma hydration level has been modeled by varying the amount of water ±14 \% in the tissue-equivalent fluid. Transmission based measurements have been performed on a tube phantom of PMMA with narrowband patch antennas on flexible substrates. The antennas have been placed at opposite sides of the phantom and measurements have been performed at different hydration levels of the substitute liquid. A clear distinction of the levels can be seen in both magnitude and phase of the transmission coefficient.},
    }
  • [DOI] A. Bauch, M. Hofmann, J. Nehring, R. Weigel, and D. Kissinger, "A 2-30 GHz Multi-Octave Planar Microwave Six-Port for Reflectometry Applications" in European Microwave Conference 2015, 2015. [Bibtex]
    @inproceedings{bauch2015,
    author  = {Bauch, Andreas and Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 2-30 GHz Multi-Octave Planar Microwave Six-Port for Reflectometry Applications},
    booktitle  = {{European Microwave Conference 2015}},
    year  = {2015},
    month  = {09},
    day  = {08},
    doi  = {10.1109/EuMC.2015.7345697},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1806},
    abstract  = {This paper presents a planar multilayer six-port circuit implementation based on multi-octave directional couplers. The presented six-port circuit is the first published six-port, that is capable of operating in an ultra-boradband frequency range from 2 to 30 GHz. Within this spectrum the six-port allows for the determination of the complex reflexion coefficient through four scalar power measurements. The six-port circuit is based on the quasi-optimal design proposed by Engen. Proper functionality has been verified through measurements of the S-parameters and the calculated q-points.},
    }
  • G. Fischer, "Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE" in EUMW European Microwave Week, 2015. [Bibtex]
    @inproceedings{fischer2015b,
    author  = {Fischer, Georg},
    title  = {Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE},
    booktitle  = {{EUMW European Microwave Week}},
    year  = {2015},
    month  = {09},
    day  = {07},
    location  = {Paris},
    publisher  = {EUMA, Horizon House},
    keywords  = {PMSE,C-PMSE,UHF,CR,SDR},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1736},
    abstract  = {There have been two initiatives one in ETSI called STF386 and one inside a German national research project named C-PMSE funded by BMWI (German Ministry of Research and Education), that both deal with cognitive radio resource management for PMSE. The ambition was to mitigate interference through cognitive techniques. Principles of cognitive radio technology were adapted to the specific requirements of PMSE. The talk will therefore start highlighting the specific characteristics of PMSE, which strongly deviate from other known systems. PMSE demands very high availability near 100\% in order to avoid drop-outs. Furthermore PMSE systems often are demanded to support very low latency in the order of 2 ms per PMSE link and 5 ms round trip. As PMSE usually can’t use heavy compression techniques (Digital Source coding or analogue compression) and channels are typically narrowband (e.g. 200 kHz), the operational SNR at RF is very high in the order of 50 dB. This makes PMSE very vulnerable to interference whether originating from other systems or own transmitter intermodulation. Cognitive resource management will dynamically adjust the transmit frequencies and transmit power of PMSE equipment. If the link quality degrades or is somehow about to degrade then above radio resource parameters are readjusted. The cognitive radio resource management is following the general rationale defined by the cognitive cycle as e.g. depicted by Mitola. For this purpose knowledge about the actual situation is needed. This knowledge is obtained by supervising actual link quality regardless whether analogue or digital transmission is used and by obtaining a radio environment map and consulting a geolocation database. In order to build this radio environment map, a grid of spectrum sensors is installed at an event location. Movement profiles of PMSE devices can thus be detected. It is important to stress that the cognitive regime followed includes nonlinear consideration. Spectrum resources interdepend due to non-linear effects, meaning that PMSE links could be interfered by transmit intermodulation from two other PMSE links, which makes the management of large scale events with many PMSE links challenging. Due to high operational SNR of PMSE links intermodulation products up to 5th sometimes even 7th order must be considered in transmit frequency assignment. The techniques derived during the course of the ETSI STF386 and BMWI C-PMSE project were implemented and practically studied in a trial at Messe Berlin. Luckily partners in the two initiatives were nearly identical and work in both initiatives was conducted in synchronous manner. The talk will therefore also highlight the practical implementations and trials conducted, that proofed the desired functionality. Although the technologies developed proofed that interference could be mitigated and thus PMSE links get more reliable in spectrum hostile environments, it was discovered that no additional capacity can be obtained.},
    }
  • [DOI] A. Tobola, R. Rybalko, O. Korpok, F. Streit, C. Espig, C. Hofmann, B. Schmitz, M. Struck, C. Weigand, and G. Fischer, "ULPSEK – Ultra-Low-Power Sensor Evaluation Kit" in FOCUS Session "Wearable Sensors", BMT, 2015, 2015. [Bibtex]
    @inproceedings{tobola2015b,
    author  = {Tobola, Andreas and Rybalko, Ruslan and Korpok, Oliver and Streit, Franz and Espig, Chris and Hofmann, Christian and Schmitz, Björn and Struck, Matthias and Weigand, Christian and Fischer, Georg},
    title  = {ULPSEK – Ultra-Low-Power Sensor Evaluation Kit},
    booktitle  = {{FOCUS Session "Wearable Sensors", BMT, 2015}},
    year  = {2015},
    month  = {09},
    doi  = {10.1515/bmt-2015-5018},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1719},
    }
  • M. Trautmann, "Implementation of Simultaneous Energy and Data Transfer for Charging Electric Vehicles" in 4th International Energy Transfer for Electric Vehicles Conference (ETEV), 2015. [Bibtex]
    @inproceedings{trautmann2015,
    author  = {Trautmann, Martin},
    title  = {Implementation of Simultaneous Energy and Data Transfer for Charging Electric Vehicles},
    booktitle  = {{4th International Energy Transfer for Electric Vehicles Conference (ETEV)}},
    year  = {2015},
    month  = {09},
    location  = {Nuremberg},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1729},
    }
  • [DOI] J. Röber, C. Zwick, A. Bänisch, S. Dirauf, G. Roppenecker, and R. Weigel, "Novel Control Methods for Phase Lock Loops" in European conference on circuit theory and design (ECCTD), 2015. [Bibtex]
    @inproceedings{roeber2015a,
    author  = {Röber, Jürgen and Zwick, Christian and Bänisch, Andreas and Dirauf, Simon and Roppenecker, Günter and Weigel, Robert},
    title  = {Novel Control Methods for Phase Lock Loops},
    booktitle  = {{European conference on circuit theory and design (ECCTD)}},
    year  = {2015},
    month  = {08},
    doi  = {10.1109/ECCTD.2015.7300091},
    location  = {Trondheim},
    publisher  = {IEEE},
    keywords  = {PLL,Phase Lock Loop,Synthesizer,Control Theory,Behavioral Modeling},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1665},
    abstract  = {This paper discusses different approaches to improve the settling behavior of phase lock loops (PLL). Starting with a state-of-the-art PLL, a structure with an additional dynamic changing Loop-Filter and another structure with feed forward control are proposed. The main point of this paper is the adaption of modern control theory in the design of PLL systems to improve the behavior in case of a changing dividing factor and thereby the output frequency. For both structures, advantages and disadvantages are discussed and then the block diagram of the two approaches are presented. Both methods are compared to the state-of-the-art by simulations in MatLab Simulink. Therefore a massive changing output frequency of the PLL and the corresponding time for locking to the new output frequency is analyzed. All in all both novel PLL concepts offer a reduced settling time with respect to a specified change of the PLL output frequency.},
    }
  • [DOI] F. Xie, R. Weiß, and R. Weigel, "Giant-Magnetoresistance-Based Galvanically Isolated Voltage and Current Measurements", IEEE Transactions on Instrumentations and Measurements, vol. 64, iss. 8, pp. 2048-2054, 2015. [Bibtex]
    @article{xie2015,
    author  = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    title  = {Giant-Magnetoresistance-Based Galvanically Isolated Voltage and Current Measurements},
    journal  = {{IEEE Transactions on Instrumentations and Measurements}},
    year  = {2015},
    month  = {08},
    pages  = {2048--2054},
    doi  = {10.1109/TIM.2015.2440553},
    volume  = {64},
    number  = {8},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1865},
    }
  • [DOI] A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, D. Schwanke, T. Rittweg, R. Weigel, and A. Koelpin, "Embedded Cavity based Dielectric Loss Measurements for LTCC Substrates up to 110 GHz" in IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications, 2015, pp. 1-4. [Bibtex]
    @inproceedings{talai2015b,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Schwanke, Dieter and Rittweg, Thomas and Weigel, Robert and Koelpin, Alexander},
    title  = {Embedded Cavity based Dielectric Loss Measurements for LTCC Substrates up to 110 GHz},
    booktitle  = {{IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications}},
    year  = {2015},
    month  = {08},
    day  = {13},
    pages  = {1--4},
    doi  = {10.1109/NEMO.2015.7415066},
    location  = {Ottawa, Canada},
    publisher  = {IEEE},
    keywords  = {Dielectric Loss,Differential Amplitude,Embedded Cavity,LTCC,Material Characterization},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1639},
    abstract  = {In literature there exists manifold techniques for measuring the permittivity of substrates. Printed circuit board (PCB) based methods like dielectric resonators are in general limited to determine the absolute value of the complex permittivity since e.g. a half wave resonator only provides information on the electrical length, which is inversely proportional to the square root of the absolute value of the permittivity. Additionally, dielectric loss measurements are more difficult, expensive and often limited to discrete frequency points due to resonance based measurement principles. In this paper, a PCB based dielectric loss measurement system is presented, operating from a few GHz up to 110 GHz, which is based on a differential measurement of a microstrip line on dense low temperature cofired ceramics (LTCC) and a microstrip on a LTCC layer with an embedded cavity. The cavity reduces the dielectric loss of the transmission line by replacing a certain amount of substrate with air. Subsequent electromagnetic time domain field simulations allow the dielectric loss assignment over the measured transmission frequency range.},
    }
  • [DOI] C. Söll, L. Shi, A. Bänisch, J. Röber, T. Ußmüller, and R. Weigel, "Analog Computation Methods with the help of analog and pseudo-digital Carry Signals" in IEEE European conference on circuit theory and design (ECCTD), 2015, pp. 1-4. [Bibtex]
    @inproceedings{soell2015a,
    author  = {Söll, Christopher and Shi, Lan and Bänisch, Andreas and Röber, Jürgen and Ußmüller, Thomas and Weigel, Robert},
    title  = {Analog Computation Methods with the help of analog and pseudo-digital Carry Signals},
    booktitle  = {{IEEE European conference on circuit theory and design (ECCTD)}},
    year  = {2015},
    month  = {08},
    day  = {24},
    pages  = {1--4},
    doi  = {10.1109/ECCTD.2015.7300039},
    location  = {Trondheim},
    keywords  = {analog computation,analog carry,pseudo-digital carry,pre-processing,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1659},
    abstract  = {This work describes new methods of handling exceedings of the supply range in analog computation stages. These are handled as pseudo-digital and analog carry signals and used to regulate the gain of the stage where they occur as well as all computation stages that follow. A complete example for such an analog computation is simulated and presented and critical parts of the architectures are addressed. In addition, more sophisticated extensions are proposed and the ”right” way of carry handling is explained for a specific algorithm, together with a discussion of the advantages of different methods for each application.},
    }
  • [DOI] D. Kissinger, J. Nehring, A. Oborovski, K. Borutta, I. Nasr, B. Lämmle, and R. Weigel, "Integrated Test Concepts for In-Situ Millimeter-Wave Device Characterization" in NEWCAS, 2015, pp. 1-4. [Bibtex]
    @inproceedings{kissinger2015b,
    author  = {Kissinger, Dietmar and Nehring, Johannes and Oborovski, Andreas and Borutta, Karl and Nasr, Ismail and Lämmle, Benjamin and Weigel, Robert},
    title  = {Integrated Test Concepts for In-Situ Millimeter-Wave Device Characterization},
    booktitle  = {{NEWCAS}},
    year  = {2015},
    month  = {07},
    pages  = {1--4},
    doi  = {10.1109/NEWCAS.2015.7181980},
    location  = {Grenoble, France},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1670},
    }
  • G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for High Selectivity in RF Transmitter Front-Ends" in 2nd International Scientific Symposium ”Sense. Enable. SPITSE.” 2015, 2015, pp. 15-18. [Bibtex]
    @inproceedings{gottardo2015,
    author  = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    title  = {Hybrid Recursive Active Filters for High Selectivity in RF Transmitter Front-Ends},
    booktitle  = {{2nd International Scientific Symposium ”Sense. Enable. SPITSE.” 2015}},
    year  = {2015},
    month  = {07},
    day  = {03},
    pages  = {15--18},
    location  = {St. Petersburg, Russia},
    publisher  = {St. Petersburg Electrotechnical University "LETI" Symposium Proceedings - IEEE},
    keywords  = {Active filter,feedback amplifier,base station,stability analysis,interference suppression,band-pass filters,cavity resonators},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1660},
    abstract  = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband feedback applied to the analog power amplifiers is described making use of a model here verified by measurements. The design of hybrid filters allows the closed loop system to reach up to 20 dB difference between maximum gain and attenuation. Particular attention is dedicated to preserve stability conditions. The proposed architecture has the potential to reduce the cost and size of the RF front-ends.},
    }
  • [DOI] S. Glock, J. Rascher, B. Sogl, T. Ußmüller, J. Müller, and R. Weigel, "A Memoryless Semi-Physical Power Amplifier Behavioral Model Based on the Correlation Between AM-AM and AM-PM Distortions", IEEE Transactions on Microwave Theory and Techniques, vol. 63, iss. 6, pp. 1826-1835, 2015. [Bibtex]
    @article{glock2015,
    author  = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Weigel, Robert},
    title  = {A Memoryless Semi-Physical Power Amplifier Behavioral Model Based on the Correlation Between AM-AM and AM-PM Distortions},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2015},
    month  = {06},
    pages  = {1826--1835},
    doi  = {10.1109/TMTT.2015.2418751},
    volume  = {63},
    number  = {6},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1866},
    }
  • [DOI] C. Söll, A. Bänisch, J. Röber, L. Shi, and R. Weigel, "A Multi-Functional Reconfigurable Low-Power Ultra-High PSRR CMOS Reference-System" in IEEE Conference on PhD Research in Microelectronics and Electronics (PRIME), 2015, pp. 220-223. [Bibtex]
    @inproceedings{soell2015,
    author  = {Söll, Christopher and Bänisch, Andreas and Röber, Jürgen and Shi, Lan and Weigel, Robert},
    title  = {A Multi-Functional Reconfigurable Low-Power Ultra-High PSRR CMOS Reference-System},
    booktitle  = {{IEEE Conference on PhD Research in Microelectronics and Electronics (PRIME)}},
    year  = {2015},
    month  = {06},
    day  = {29},
    pages  = {220--223},
    doi  = {10.1109/PRIME.2015.7251374},
    location  = {Glasgow},
    keywords  = {bandgap,reference,low power,high psrr,temperature coefficient,subregulation,GRK-1773},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1658},
    abstract  = {This paper presents a new reference system with emphasis on low power design and high power supply rejection. The untrimmed reference provides a 600mV output voltage, which only differs by 5.75mV in the temperature range between -40 ◦ C and +125 ◦ C and a PSRR of -157.2 dB at 10Hz. The core part of the reference produces a reference potential of 416.1mV with a deviation of only 1.59mV. Moreover, the circuit provides a 900mV output, a temperature independent 3 μA current and trimming possibilities for the temperature curves and the amplitude of output voltages and currents. Under all operating conditions, the post-layout Corner- and Monte-Carlo-Simulations show a power consumption of less than 40 μA and ensure functionality across process, supply voltage and temperature variations.},
    }
  • [DOI] A. Tobola, F. Streit, C. Espig, O. Korpok, C. Sauter, N. Lang, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, H. Leutheuser, B. Eskofier, and G. Fischer, "Sampling Rate Impact on Energy Consumption of Biomedical Signal Processing Systems" in Body Sensor Networks Conference, 2015. [Bibtex]
    @inproceedings{tobola2015a,
    author  = {Tobola, Andreas and Streit, Franz and Espig, Chris and Korpok, Oliver and Sauter, Christian and Lang, Nadine and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Leutheuser, Heike and Eskofier, Björn and Fischer, Georg},
    title  = {Sampling Rate Impact on Energy Consumption of Biomedical Signal Processing Systems},
    booktitle  = {{Body Sensor Networks Conference}},
    year  = {2015},
    month  = {06},
    doi  = {10.1109/BSN.2015.7299392},
    location  = {MIT, Cambridge, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1661},
    abstract  = {Long battery runtime is one of the most wanted properties of wearable sensor systems. The sampling rate has an high impact on the power consumption. However, defining a sufficient sampling rate, especially for cutting edge mobile sensors is difficult. Often, a high sampling rate, up to four times higher than necessary, is chosen as a precaution. Especially for biomedical sensor applications many contradictory recommendations exist, how to select the appropriate sample rate. They all are motivated from one point of view – the signal quality. In this paper we motivate to keep the sampling rate as low as possible. Therefore we reviewed common algorithms for biomedical signal processing. For each algorithm the number of operations depending on the data rate has been estimated. The Bachmann-Landau notation has been used to evaluate the computational complexity in dependency of the sampling rate. We found linear, logarithmic, quadratic and cubic dependencies.},
    }
  • G. Fischer, "The spectrum situation for PMSE - Or why is PMSE so unique?" in PEARLE Conference, 2015. [Bibtex]
    @inproceedings{fischer2015,
    author  = {Fischer, Georg},
    title  = {The spectrum situation for PMSE - Or why is PMSE so unique?},
    booktitle  = {{PEARLE Conference}},
    year  = {2015},
    month  = {06},
    day  = {12},
    location  = {Hamburg},
    publisher  = {PEARLE},
    keywords  = {PMSE,C-PMSE,UHF,CR,SDR,Multimedia},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1737},
    }
  • [DOI] F. Dressler, B. Bloessl, M. Hierold, C. Hsieh, T. Nowak, R. Weigel, and A. Koelpin, "Protocol Design for Ultra-Low Power Wake-Up Systems for Tracking Bats in the Wild" in IEEE International Conference on Communications (ICC 2015), London, UK, 2015, pp. 6345-6350. [Bibtex]
    @inproceedings{dressler2015a,
    author  = {Dressler, Falko and Bloessl, Bastian and Hierold, Martin and Hsieh, Chia-Yu and Nowak, Thorsten and Weigel, Robert and Koelpin, Alexander},
    title  = {Protocol Design for Ultra-Low Power Wake-Up Systems for Tracking Bats in the Wild},
    booktitle  = {{IEEE International Conference on Communications (ICC 2015)}},
    year  = {2015},
    month  = {06},
    pages  = {6345--6350},
    doi  = {10.1109/ICC.2015.7249335},
    address  = {London, UK},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1667},
    abstract  = {We present a novel concept for a wake-up system based ultra-low power communication protocol for sensor net- works. The main application field is monitoring contacts and even tracks of bats in the wild. Our sensor nodes can weigh at most 2g out of which 1g remains for the battery. We investigate a novel communication protocol design applicable to these systems and also showing great potentials for other ultra- low power sensor networks. In particular, we investigate the bat to ground communication by combining duty cycling with a multi-stage wake-up receiver. We employ Binary Offset Carrier (BOC) modulated signals that allow to accurately localize and track the bats while transmitting data in parallel. In a first step, we evaluated the conceptual design using a software-defined radio system to demonstrate the feasibility of the protocol design.},
    }
  • B. Pfundt, M. Reichenbach, D. Fey, and C. Söll, "Novel Image Processing Architecture for 3D Integrated Circuits" in Parallel -Algorithmen, -Rechnerstrukturen und -Systemsoftware (PARS), 2015, pp. 5-15. [Bibtex]
    @inproceedings{pfundt2015,
    author  = {Pfundt, Benjamin and Reichenbach, Marc and Fey, Dietmar and Söll, Christopher},
    title  = {Novel Image Processing Architecture for 3D Integrated Circuits},
    booktitle  = {{Parallel -Algorithmen, -Rechnerstrukturen und -Systemsoftware (PARS)}},
    year  = {2015},
    month  = {05},
    day  = {07},
    pages  = {5--15},
    location  = {Potsdam},
    keywords  = {3D IC,TSV,parallel processing,2D filters,full buffering},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1657},
    abstract  = {Utilizing highly parallel processors for high speed embedded image processing is a well known approach. However, the question of how to provide a sufficiently fast data rate from image sensor to processing unit is still not solved. As Trough-Silicon-Vias (TSV), a new technology for chip stacking, become available, parallel image transmission from the image sensor to processing unit is enabled. Nevertheless, the usage of a new technology requires architectural changes in the processing units.With this technology at hand, we present a novel image preprocessing architecture suitable for image processing in 3D chips stacks. The architecture was developed in parallel with a customized image sensor to make a real assembly possible. It is fully functionally verified and layouted for a 150 nm process. Our performance estimation shows a processing speed of 770 up to 30.000 fps (frames per second) for 5x5 filters.},
    }
  • [DOI] J. Röber, A. Bänisch, G. Fischer, and R. Weigel, "A Low Noise Amplifier Chain for Digital Satellite Radio Applications" in IEEE International Symposium on Circuits and Systems (ISCAS), 2015. [Bibtex]
    @inproceedings{roeber2015,
    author  = {Röber, Jürgen and Bänisch, Andreas and Fischer, Georg and Weigel, Robert},
    title  = {A Low Noise Amplifier Chain for Digital Satellite Radio Applications},
    booktitle  = {{IEEE International Symposium on Circuits and Systems (ISCAS)}},
    year  = {2015},
    month  = {05},
    doi  = {10.1109/ISCAS.2015.7169187},
    location  = {Lisabon},
    publisher  = {IEEE},
    keywords  = {LNA,low noise,high gain,differential,distortion canceller,CCPDC},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1664},
    abstract  = {This paper contains the development and verification of low noise amplifier stages (LNA) within the framework of a front-end for digital satellite radio diversity receiver operating around 2.3 GHz. First, a low noise high gain LNA is developed to reach the high requirements of satellite radio reception. Therefore a single-ended cascode architecture is chosen. The simulated noise figure is 0.58 dB and the gain is 19.87 dB. Second, a differential stage is designed to fulfill the specification with regards to backward isolation and common-mode rejection. This circuit has a measured gain of 10.15 dB and a backward isolation of -43.24 dB. Furthermore, the two stages are combined by an integrated balun and the overall performance is verified. Due to the good noise performance of the first stage, the overall noise figure is 0.64 dB, the gain is 29.83 dB and the backward isolation is - 76.07 dB. All in all the whole circuit has a current consumption of 25.40 mA. Finally the LNA performance is compared with other state-of-the-art LNAs.},
    }
  • [DOI] A. Tag, W. Akstaller, C. Musolff, B. Bader, M. Pitschi, R. Weigel, and A. Hagelauer, "Polyharmonic Distortion Modeling of RF BAW Components" in IEEE International Microwave Symposium, 2015, pp. 1-3. [Bibtex]
    @inproceedings{tag2015a,
    author  = {Tag, Andreas and Akstaller, Wolfgang and Musolff, Christian and Bader, Bernhard and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    title  = {Polyharmonic Distortion Modeling of RF BAW Components},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2015},
    month  = {05},
    pages  = {1--3},
    doi  = {10.1109/MWSYM.2015.7166954},
    location  = {Phoenix, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1685},
    }
  • [DOI] D. Kissinger, T. Girg, C. Beck, I. Nasr, H. Forstner, M. Wojnowski, K. Pressel, and R. Weigel, "Integrated millimeter-wave transceiver concepts and technologies for wireless multi-Gbps communication" in IEEE MTT-S International Microwave Symposium, 2015, pp. 1-3. [Bibtex]
    @inproceedings{kissinger2015a,
    author  = {Kissinger, Dietmar and Girg, Thomas and Beck, Christopher and Nasr, Ismail and Forstner, Hans-Peter and Wojnowski, Maciej and Pressel, Klaus and Weigel, Robert},
    title  = {Integrated millimeter-wave transceiver concepts and technologies for wireless multi-Gbps communication},
    booktitle  = {{IEEE MTT-S International Microwave Symposium}},
    year  = {2015},
    month  = {05},
    pages  = {1--3},
    doi  = {10.1109/MWSYM.2015.7166712},
    location  = {Phoenix, AZ},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1682},
    }
  • [DOI] W. Akstaller, A. Tag, C. Musolff, R. Weigel, and A. Hagelauer, "Measurement Setup for X-Parameter Characterization of Bulk Acoustic Wave Resonators" in IEEE ARFTG, 2015, pp. 1-3. [Bibtex]
    @inproceedings{akstaller2015,
    author  = {Akstaller, Wolfgang and Tag, Andreas and Musolff, Christian and Weigel, Robert and Hagelauer, Amelie},
    title  = {Measurement Setup for X-Parameter Characterization of Bulk Acoustic Wave Resonators},
    booktitle  = {{IEEE ARFTG}},
    year  = {2015},
    month  = {05},
    pages  = {1--3},
    doi  = {10.1109/ARFTG.2015.7162919},
    location  = {Phoenix, USA},
    keywords  = {X-Parameter,BAW},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1663},
    abstract  = {In this work a modern measurement method has been utilized in order to characterize nonlinear behavior of bulk acoustic wave (BAW) solidly mounted resonators (SMR). Unlike typical nonlinearity characterization methods, the method which was employed here not only records amplitudes, but also the phase of generated harmonics. Furthermore, the relations between the harmonics of different order are given. The modeling approach being used is the poly harmonic distortion (PHD) modeling approach, realized by the measurement of X-Parameters. For that purpose it was necessary to extend a nonlinear vector network analyzer (NVNA) by external components in order to enable high power measurements. Afterwards, several optimization steps were required to perform phase calibration. This difficulty arose due to the high power incident tones and steep resonator impedance curves on the one hand and the limited power provided by the phase calibration standard on the other hand.},
    }
  • [DOI] Y. Can and G. Fischer, "Boolean Orthogonalizing Combination Methods" in Fifth International Conference on Computational Science, Engineering and Information Technology, 2015. [Bibtex]
    @inproceedings{can2015,
    author  = {Can, Yavuz and Fischer, Georg},
    title  = {Boolean Orthogonalizing Combination Methods},
    booktitle  = {{Fifth International Conference on Computational Science, Engineering and Information Technology}},
    year  = {2015},
    month  = {05},
    doi  = {10.5121/csit.2015.51102},
    location  = {Vienna, Austria},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1654},
    }
  • [DOI] A. Talai, S. Mann, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "A Semi Double-Ridged quasi TE-Waveguide based Microwave Bulk Material Characterization System" in Microwave Symposium (IMS), 2015 IEEE MTT-S International, 2015, pp. 1-4. [Bibtex]
    @inproceedings{talai2015a,
    author  = {Talai, Armin and Mann, Sebastian and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {A Semi Double-Ridged quasi TE-Waveguide based Microwave Bulk Material Characterization System},
    booktitle  = {{Microwave Symposium (IMS), 2015 IEEE MTT-S International}},
    year  = {2015},
    month  = {05},
    pages  = {1--4},
    doi  = {10.1109/MWSYM.2015.7166937},
    location  = {Phoenix, USA},
    publisher  = {IEEE},
    keywords  = {Material Characterization,Phase Measurement,Ridged Waveguide,Relative Permittivity},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1631},
    abstract  = {Accurate microwave material characterization is essential for reliable high frequency circuit design. Therefore, various characterization techniques have been developed, comprising advantages and drawbacks for the respective conditions. In this paper, a material characterization system is presented, which enables a broadband measurement for both dielectric loss and relative permittivity of bulk substrates with variant geometrical dimensions. A semi double-ridged waveguide is used to measure the introduced phase shift and dampening due to a strip of material, allowing a combined evaluation of the complex permittivity by measurement and simulation.},
    }
  • [DOI] G. Guarin, M. Hofmann, J. Nehring, R. Weigel, G. Fischer, and D. Kissinger, "Miniature Microwave Biosensors: Noninvasive Applications", IEEE Microwave Magazine, vol. 16, iss. 4, pp. 71-86, 2015. [Bibtex]
    @article{guarin2015a,
    author  = {Guarin, Gustavo and Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Miniature Microwave Biosensors: Noninvasive Applications},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2015},
    month  = {05},
    pages  = {71--86},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2015.2394024},
    publisher  = {IEEE},
    volume  = {16},
    number  = {4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1671},
    }
  • [DOI] S. Linz, F. Lurz, M. Sporer, S. Lindner, S. Mann, R. Weigel, and A. Koelpin, "Ultra-short-range, precise displacement measurement setup with a near field slot-line antenna and a dedicated spiral calibration algorithm" in IEEE International Microwave Symposium, 2015. [Bibtex]
    @inproceedings{linz2015a,
    author  = {Linz, Sarah and Lurz, Fabian and Sporer, Michael and Lindner, Stefan and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Ultra-short-range, precise displacement measurement setup with a near field slot-line antenna and a dedicated spiral calibration algorithm},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2015},
    month  = {05},
    doi  = {10.1109/MWSYM.2015.7167116},
    location  = {Phoenix, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1636},
    }
  • A. Koelpin, F. Lurz, and R. Weigel, "Introduction in High-Resolution and Ultra-Low Power Distance Measurements by Microwave Interferometry" in International Microwave Symposium, 2015. [Bibtex]
    @inproceedings{koelpin2015,
    author  = {Koelpin, Alexander and Lurz, Fabian and Weigel, Robert},
    title  = {Introduction in High-Resolution and Ultra-Low Power Distance Measurements by Microwave Interferometry},
    booktitle  = {{International Microwave Symposium}},
    year  = {2015},
    month  = {05},
    day  = {17},
    location  = {Phoenix, Arizona, USA},
    keywords  = {Radar,Interferometry},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1638},
    abstract  = {Many civilian measurement applications can be realized by microwave interferometry. This radar architecture features low hardware and software complexity and can be optimized for highest distance resolutions in the micrometer regime combined with a measurement value update rate of several kilohertz or ultra-low power operation for, e.g., presence detection. Both approaches will be discussed in this talk. After introducing the basic technology and dependencies a detailed introduction to real hardware building blocks for the K band will be given. Also non-ideal effects and approaches for calibrating the system will be given. The talk will close with real world applications spreading from simple presence detection to precise distance measurements, vibration analysis and frequency determination.},
    }
  • [DOI] A. Cattaneo, S. Pinarello, J. Müller, and R. Weigel, "Impact of DC and RF non-conducting stress on nMOS reliability" in IEEE International Reliability Physics Symposium (IRPS), 2015, p. XT4.1--XT4.4. [Bibtex]
    @inproceedings{cattaneo2015,
    author  = {Cattaneo, Andrea and Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    title  = {Impact of DC and RF non-conducting stress on nMOS reliability},
    booktitle  = {{IEEE International Reliability Physics Symposium (IRPS)}},
    year  = {2015},
    month  = {04},
    pages  = {XT4.1--XT4.4},
    doi  = {10.1109/IRPS.2015.7112835},
    location  = {Monterey, CA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1791},
    abstract  = {The increase of leakage current in deep-submicrometer MOS transistors operated below threshold is becoming a reliability concern for scaled technology nodes. Especially high-power analog applications like high efficiency PAs and RF-switches undergo to strong lateral field when Vg <;Vth. Indeed an increased degradation for these MOS applications was already reported in the state of the art but not completely understood. In this paper a thorough study of the DC non-conducting (NC) stress is presented and a new physical model describing the worsening of the electrical parameter is proposed. This model is suitable for being extended to the high frequency regime by means of a quasi-static sum (QS). For the first time RF stress measurements are conducted in various NC configurations. No frequency dependency is detected up to 4Ghz and the QS model is able to precisely predict the performance degradation.},
    }
  • [DOI] G. Vinci, T. Lenhard, C. Will, and A. Koelpin, "Microwave Interferometer Radar-Based Vital Sign Detection for Driver Monitoring Systems" in IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), 2015. [Bibtex]
    @inproceedings{vinci2015,
    author  = {Vinci, Gabor and Lenhard, Thilo and Will, Christoph and Koelpin, Alexander},
    title  = {Microwave Interferometer Radar-Based Vital Sign Detection for Driver Monitoring Systems},
    booktitle  = {{IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM)}},
    year  = {2015},
    month  = {04},
    day  = {27},
    doi  = {10.1109/ICMIM.2015.7117940},
    location  = {Heidelberg, Germany},
    note  = {Published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1673},
    abstract  = {Autonomous driving is a topic of great importance for our society and is expected to be introduced in the automotive market in a couple of decades. Today, vehicles can already autonomously brake and accelerate in order to avoid crashes with obstacles detected by camera and radar technology. The next step towards autonomous driving is the introduction of driver health monitoring systems. Intensive research is being conducted in this field with the goal of developing a ”biometric driver seat”. In this paper, an interferometric radar-based vital sign detection is presented. The aim is to investigate the applicability of radar technology for vital sign monitoring such as heartbeat and breath rate of the driver with sensors embedded in the seat. The proposed interferometric radar is based on the Six-Port receiver technique and shows excellent performance for the addressed application.},
    }
  • [DOI] S. Müller, J. Dennerlein, I. Janke, J. Weber, R. Weigel, and A. Koelpin, "In-Containment Signal Conditioning and Transmission via Power Lines within High Dose Rate Areas of Nuclear Power Plants" in International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), 2015, pp. 1-8. [Bibtex]
    @inproceedings{mueller2015a,
    author  = {Müller, Steffen and Dennerlein, Jürgen and Janke, Iryna and Weber, Johannes and Weigel, Robert and Koelpin, Alexander},
    title  = {In-Containment Signal Conditioning and Transmission via Power Lines within High Dose Rate Areas of Nuclear Power Plants},
    booktitle  = {{International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA)}},
    year  = {2015},
    month  = {04},
    day  = {21},
    pages  = {1--8},
    doi  = {10.1109/ANIMMA.2015.7465532},
    location  = {Lisbon, Portugal},
    keywords  = {Power Line Communication,PLC,radiation hard electronics,radhard,sensor networks,online monitoring,OLM,monitoring and diagnostics,M&D},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1652},
    abstract  = {Signal conditioning and transmission for sensor systems and networks within the containment of nuclear power plants (NPPs) still poses a challenge to engineers, particularly in the case of equipment upgrades for existing plants, temporary measurements, decommissioning of plants, but also for new builds. This paper presents an innovative method for efficient and cost-effective instrumentation within high dose rate areas inside the containment. A transmitter-receiver topology is proposed that allows simultaneous, unidirectional point-to-point transmission of multiple sensor signals by superimposing them on existing AC or DC power supply cables using power line communication (PLC) technology. Thereby the need for costly installation of additional cables and containment penetrations is eliminated. Based on commercial off-the-shelf (COTS) electronic parts, a radiation hard transmitter is designed to operate in harsh environment within the containment during full plant operation. Hardware modularity of the transmitter allows application specific tradeoffs between redundancy and channel bandwidth. At receiver side in non-radiated areas, signals are extracted from the power line, demodulated, and provided either in analog or digital output format. Laboratory qualification tests and field test results within a boiling water reactor (BWR) are validating the proof of concept of the proposed system.},
    }
  • [DOI] V. Silva and G. Fischer, "Shunt MEMS switch requirements for Tunable Matching Network at 1.9 GHz in composite substrates" in German Microwave Conference (GeMiC), 2015, pp. 422-425. [Bibtex]
    @inproceedings{silva2015,
    author  = {Silva, Victor and Fischer, Georg},
    title  = {Shunt MEMS switch requirements for Tunable Matching Network at 1.9 GHz in composite substrates},
    booktitle  = {{German Microwave Conference (GeMiC)}},
    year  = {2015},
    month  = {03},
    pages  = {422--425},
    doi  = {10.1109/GEMIC.2015.7107843},
    location  = {Nürnberg},
    publisher  = {IEEE},
    keywords  = {RF MEMS},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1702},
    abstract  = {A theoretical approach for the specification of shunt MEMS switches suitable for Tunable Matching Networks (TMN) at 1.9GHz is presented. DC-contact fixed-fixed beam MEMS switches designed with series metal-insulator-metal (MIM) capacitors at the grounding plane of a CPW transmission line provide the basic design block for the TMN. In the down-state, the MEMS switch makes an ohmic contact with the transmission line, as consequence, the down-state capacitance of the switch is dominated by the MIM capacitors. The proper dimensioning of the MIM capacitors enables to directly increase the capacitance ratio of the switch in order to operate at frequencies below 10 GHz. Based on predefined CPW transmission line configurations on composite substrates, the optimization of the capacitance ratio of the MEMS switch can be directly related to the geometry of the CPW transmission line.},
    }
  • [DOI] A. Tag, B. Bader, M. Pitschi, K. C. Wagner, R. Weigel, and A. Hagelauer, "Determination of Temperature Coefficients of Materials in RF BAW Resonators" in German Microwave Conference, 2015, pp. 402-405. [Bibtex]
    @inproceedings{tag2015,
    author  = {Tag, Andreas and Bader, Bernhard and Pitschi, Maximilian and Wagner, Karl Christian and Weigel, Robert and Hagelauer, Amelie},
    title  = {Determination of Temperature Coefficients of Materials in RF BAW Resonators},
    booktitle  = {{German Microwave Conference}},
    year  = {2015},
    month  = {03},
    pages  = {402--405},
    doi  = {10.1109/GEMIC.2015.7107838},
    location  = {Nuremberg},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1684},
    }
  • L. Shi, C. Söll, A. Bänisch, R. Weigel, J. Seiler, and T. Ußmüller, "Concept for a CMOS Image Sensor Suited for Analog Image Pre-Processing" in Design, Automation and Test in Europe, 2015. [Bibtex]
    @inproceedings{shi2015a,
    author  = {Shi, Lan and Söll, Christopher and Bänisch, Andreas and Weigel, Robert and Seiler, Jürgen and Ußmüller, Thomas},
    title  = {Concept for a CMOS Image Sensor Suited for Analog Image Pre-Processing},
    booktitle  = {{Design, Automation and Test in Europe}},
    year  = {2015},
    month  = {03},
    day  = {13},
    location  = {Grenoble, France},
    keywords  = {Image Sensor,Analog Signal Image Pre-processing},
    url  = {https://www12.informatik.uni-erlangen.de/ws/his2015/},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1634},
    abstract  = {A concept for a novel CMOS image sensor suited for analog image pre-processing is presented in this paper. As an example, an image restoration algorithm for reducing image noise is applied as image pre-processing in the analog domain. To supply low-latency data input for analog image preprocessing, the proposed concept for a CMOS image sensor offers a new sensor signal acquisition method in 2D. In comparison to image pre-processing in the digital domain, the proposed analog image pre-processing promises an improved image quality. Furthermore, the image noise at the stage of analog sensor signal acquisition can be used to select the most effective restoration algorithm applied on the analog circuit due to image processing prior to the A/D converter.},
    }
  • [DOI] F. Müller, D. Steinbuch, T. Walter, and R. Weigel, "A method for the analysis of ramp-inherent linearity distortions in automotive radar applications" in German Microwave Conference (GeMiC), 2015, pp. 217-220. [Bibtex]
    @inproceedings{mueller2015,
    author  = {Müller, Felix and Steinbuch, Dirk and Walter, Thomas and Weigel, Robert},
    title  = {A method for the analysis of ramp-inherent linearity distortions in automotive radar applications},
    booktitle  = {{German Microwave Conference (GeMiC)}},
    year  = {2015},
    month  = {03},
    pages  = {217--220},
    doi  = {10.1109/GEMIC.2015.7107792},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1751},
    abstract  = {Through the use of sensors to provide information about the vehicles surroundings, driver assistance systems increase traffic safety. These sensors must not deliver wrong data due to noise or external distortion. In FMCW Radar systems additionally a highly linear ramp is essential. Hence nonlinear ramps have direct impact on the baseband spectrum. Weak targets could be covered and therefore not detected. This paper describes a method for evaluating the RF ramp linearity, based on analysis of the baseband signal. Therefore the analysis is easier, as the baseband frequency is only a few MHz depending on chirp modulation parameters and target distance. The instantaneous frequency is measured, so that deviations from the ideal slope can be detected immediately. Results are compared with simulations and high frequency measurements with a commercial availably spectrum analyzer which calculates the mean frequency deviation over a high number of ramps.},
    }
  • M. Hierold, C. Hsieh, R. Weigel, and A. Koelpin, "Miniaturized sensor nodes with mutual detection and localization capability" in German Microwave Conference 2015 (Gemic), 2015. [Bibtex]
    @inproceedings{hierold2015b,
    author  = {Hierold, Martin and Hsieh, Chia-Yu and Weigel, Robert and Koelpin, Alexander},
    title  = {Miniaturized sensor nodes with mutual detection and localization capability},
    booktitle  = {{German Microwave Conference 2015 (Gemic)}},
    year  = {2015},
    month  = {03},
    location  = {Nuremberg, Germany},
    keywords  = {wireless sensor network,low power},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1627},
    abstract  = {Severe restrictions in size and weight of mobile nodes intended for the observation of bats result in strict limitations of their power supply. A sensor node and system design for proximity detection in bats observation considering these constraints with first field test results is presented in this talk. For further miniaturization and specific adjustment to the target application a custom system on chip solution is proposed. Its hardware design is outlined addressing energy efficiency, localization and reconfiguration capability.},
    }
  • [DOI] D. Karolewski, A. Tag, V. Silva, A. Hagelauer, G. Fischer, and C. Schäffel, "Modeling of BAW Filters for System Level Simulation" in German Microwave Conference, 2015, pp. 410-413. [Bibtex]
    @inproceedings{karolewski2015,
    author  = {Karolewski, Dominik and Tag, Andreas and Silva, Victor and Hagelauer, Amelie and Fischer, Georg and Schäffel, Christoph},
    title  = {Modeling of BAW Filters for System Level Simulation},
    booktitle  = {{German Microwave Conference}},
    year  = {2015},
    month  = {03},
    pages  = {410--413},
    doi  = {10.1109/GEMIC.2015.7107840},
    location  = {Nuremberg},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1683},
    }
  • [DOI] T. Kastenhuber, J. Röber, A. Bänisch, G. Fischer, and R. Weigel, "A Miniaturized Very Low-Power Vector Modulated CMOS Phase Shifter for Wireless Receivers" in German Microwave Conference, 2015, pp. 343-346. [Bibtex]
    @inproceedings{kastenhuber2015,
    author  = {Kastenhuber, Tina and Röber, Jürgen and Bänisch, Andreas and Fischer, Georg and Weigel, Robert},
    title  = {A Miniaturized Very Low-Power Vector Modulated CMOS Phase Shifter for Wireless Receivers},
    booktitle  = {{German Microwave Conference}},
    year  = {2015},
    month  = {03},
    pages  = {343--346},
    doi  = {10.1109/GEMIC.2015.7107823||10.1109/GEMIC.2015.7107823},
    location  = {Nürnberg},
    publisher  = {IEEE},
    keywords  = {Phase shifter,vector modulated,PGA,constant gm-source,low-power,diversity},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1666},
    abstract  = {This paper presents and analyses a phase shifter for diversity receivers, which modulates the I-/Q-vector in the constellation diagram. The system consists of a three stage programmable gain amplifier (PGA) chain in both branches. The design covers the full phase range of 360◦. Each stage can be programmed to amplify the incoming signal between 19 dB and 63 dB with a centre frequency of 3MHz. The radio frequency (RF) signal is down-converted to an intermediate frequency (IF) of 5MHz, where phase shifting is done. The circuit is intended for an automotive satellite radio receiver in S- and L-band. Thus, demand automotive requirements have to be fulfilled. The supply voltage is 1.8V. Compared to other phase shifters, the power consumption of 2.7mW is highly energyefficient. This system includes a constant gm-source and a biasing circuit. All requirements are verified in post-layout Corner and Monte−Carlo analysis using Virtuoso and WiCkeD. The design only takes 0.116 mm2 of silicon area in a 150- nm CMOS technology.},
    }
  • [DOI] M. Hierold, S. Ripperger, F. Mayer, R. Weigel, and A. Koelpin, "System Design for Encounter Detection of Distributed Wireless Sensors" in German Microwave Conference 2015 (Gemic), 2015, pp. 382-385. [Bibtex]
    @inproceedings{hierold2015a,
    author  = {Hierold, Martin and Ripperger, Simon and Mayer, Frieder and Weigel, Robert and Koelpin, Alexander},
    title  = {System Design for Encounter Detection of Distributed Wireless Sensors},
    booktitle  = {{German Microwave Conference 2015 (Gemic)}},
    year  = {2015},
    month  = {03},
    pages  = {382--385},
    doi  = {10.1109/GEMIC.2015.7107833},
    location  = {Nuremberg, Germany},
    keywords  = {wireless sensor network,low power},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1626},
    abstract  = {In this paper a system for proximity detection of small sized animals like bats is presented. The system is based on a time slotted communication between compact low weight mobile nodes. For precise time synchronization of the nodes a scalable grid of base stations is proposed that distributes a time reference signal using a time division multiple access (TDMA) scheme. The system parameters are chosen considering the timing constraints caused by the severe requirements to the mobile nodes. In a power consumption analysis the system operation time limited by the 1.8\,g nodes is calculated to be 8.3 days. First field test results are shown which proof the functional capability of the system's principle.},
    }
  • [DOI] C. Erhart, S. Lutz, H. Mantz, T. Walter, and R. Weigel, "A highly modular 77 GHz multi-tone FMCW SiGe radar concept for industrial measurements" in German Microwave Conference 2015, 2015, pp. 252-255. [Bibtex]
    @inproceedings{erhart2015,
    author  = {Erhart, Christian and Lutz, Steffen and Mantz, Hubert and Walter, Thomas and Weigel, Robert},
    title  = {A highly modular 77 GHz multi-tone FMCW SiGe radar concept for industrial measurements},
    booktitle  = {{German Microwave Conference 2015}},
    year  = {2015},
    month  = {03},
    pages  = {252--255},
    doi  = {10.1109/GEMIC.2015.7107801},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1655},
    abstract  = {In this paper, a modular system for 77 GHz applications and a novel approach to increase the accuracy of distance measurements using angular phase shifts is presented. The sensor itself consists of state of the art MMICs and provides the opportunity to exchange the beam forming component easily. The radiation characteristics of the so far developed beam formers are illustrated and some exemplary distance measurements will be shown. The sensor prototype is integrated in a robust metal case, which is usable for measurements in harsh environments. Applications for the sensor include distance, velocity as well as surface and vibration analysis. The introduced distance measuring approach is based on FMCW multi tone modulation in combination with an innovative correlation evaluation.},
    }
  • [DOI] G. Guarin, M. Gardill, R. Weigel, G. Fischer, and D. Kissinger, "Ultra-wideband compressed sensing radar based on pseudo-random binary sequences" in German Microwave Conference, 2015, pp. 233-236. [Bibtex]
    @inproceedings{guarin2015,
    author  = {Guarin, Gustavo and Gardill, Markus and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Ultra-wideband compressed sensing radar based on pseudo-random binary sequences},
    booktitle  = {{German Microwave Conference}},
    year  = {2015},
    month  = {03},
    pages  = {233--236},
    doi  = {10.1109/GEMIC.2015.7107796},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1681},
    }
  • [DOI] S. Mann, F. Lurz, R. Weigel, and A. Koelpin, "A High-Sensitivity Radar System Featuring Low Weight and Power Consumption", IEEE Microwave Magazine, vol. 16, iss. 2, pp. 99-105, 2015. [Bibtex]
    @article{mann2015a,
    author  = {Mann, Sebastian and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    title  = {A High-Sensitivity Radar System Featuring Low Weight and Power Consumption},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2015},
    month  = {03},
    pages  = {99--105},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2014.2367860},
    publisher  = {IEEE},
    keywords  = {Low Power,Radar},
    volume  = {16},
    number  = {2},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1708},
    abstract  = {In this article, a lightweight, low-power radar system for vibration monitoring has been presented. Based on a theoretical analysis of the competition scenario, an optimized system concept has been developed. The radar front end is able to sequentially evaluate the in-phase and quadrature component of the received signal with only a single hybrid coupler and power detector, reducing the overall weight to 5 g including the power-supply cable. A low duty cycle of 1\% allowed the power to average 1.5 mW. As the minimum required sensitivity was limited to 0.5-mm oscillation amplitude, the most challenging parts in this student competition were, in our opinion, the tight power and weight optimizations. As the competition required only vibration detection butno ranging, a minimalistic system concept optimized for this application was proposed. The system features a free-running VCO sourced directly from the power supply without any further stabilization. For ranging applications, temperature changes as well as supply and tuning voltage variations at the VCO could have a severe impact on the system's accuracy. However, for pure vibration detection of a well-defined target, this is not a problem. Further improvements could be achieved when designing a customized 24-GHz oscillator, optimized for high efficiency [9] and fast turn-on time. In addition, the necessary number of measurements per second could be further investigated. Currently, with ten measurements per second, there is a convenient safety margin against false detections; however, fewer measurements would directly reduce the duty cycle and thus the average power consumption of the system.},
    }
  • [DOI] A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "A Method for the Determination of the Complex Permittivity by Detuned Ring Resonators for Bulk Materials up to 110 GHz", International Journal of Microwave and Wireless Technologies, pp. 251-260, 2015. [Bibtex]
    @article{talai2015,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {A Method for the Determination of the Complex Permittivity by Detuned Ring Resonators for Bulk Materials up to 110 GHz},
    journal  = {{International Journal of Microwave and Wireless Technologies}},
    year  = {2015},
    month  = {02},
    day  = {23},
    pages  = {251--260},
    issn  = {1759-0787},
    doi  = {10.1017/S1759078715000483},
    publisher  = {Cambridge University Press},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1629},
    }
  • [DOI] S. Lindner, F. Barbon, S. Linz, S. Mann, R. Weigel, and A. Koelpin, "Distance measurements and limitations based on guided wave 24GHz dual tone six-port radar", International Journal of Microwave and Wireless Technologies, vol. 7, iss. Special Issue 3-4, pp. 425-432, 2015. [Bibtex]
    @article{lindner2015a,
    author  = {Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Distance measurements and limitations based on guided wave 24GHz dual tone six-port radar},
    journal  = {{International Journal of Microwave and Wireless Technologies}},
    year  = {2015},
    month  = {02},
    day  = {25},
    pages  = {425--432},
    issn  = {1759-0795},
    doi  = {10.1017/S1759078715000239},
    publisher  = {Cambridge University Press},
    volume  = {7},
    number  = {Special Issue 3-4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1635},
    }
  • [DOI] J. Fuhrmann, P. Obmann, K. Dufrene, H. Pretl, and R. Weigel, "A 28 nm standard CMOS watt-level power amplifier for LTE applications" in IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2015, pp. 1-3. [Bibtex]
    @inproceedings{fuhrmann2015,
    author  = {Fuhrmann, Jörg and Obmann, Patrick and Dufrene, Krzysztof and Pretl, Harald and Weigel, Robert},
    title  = {A 28 nm standard CMOS watt-level power amplifier for LTE applications},
    booktitle  = {{IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)}},
    year  = {2015},
    month  = {01},
    pages  = {1--3},
    doi  = {10.1109/PAWR.2015.7139205},
    location  = {San Diego, CA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1807},
    abstract  = {In this paper, a 28nm radio frequency (RF) complementary metal-oxide-semiconductor (CMOS) power amplifier (PA) is presented. It was designed to meet 3GPP TS 36.101 V10.10.0 requirements for Long Term Evolution (LTE). The design was tested on board and has full onchip matching. Furthermore, the biasing for class-AB is also implemented on chip. The maximum gain is more than 15 dB until 0dBm input power. It achieves a power added efficiency (PAE) of 35.2 \%, a drain efficiency (DE) of 39.5\% and a maximum output power Pmax of 31.7dBm at a frequency of 1.83 GHz. The adjacent channel leakage power ratio (ACLR) for the evolved universal terrestrial radio access (E-UTRA) measured for full allocated LTE15 PUSCH are for the lower band 33.2 dBc and for the upper band 33.2 dBc. The UTRAACLR for the lower and upper band is 36.2 dBc and 35.1 dBc, respectively. The Error Vector Magnitude (EVM) is 4.8\% for a quadrature phase-shift keying (QPSK) and 3.8\% for a 16 quadrature amplitude modulation (16QAM) signal.},
    }
  • [DOI] A. Tobola, C. Espig, F. Streit, O. Korpok, H. Leutheuser, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, and G. Fischer, "Scalable ECG hardware and algorithms for extended runtime of wearable sensors" in IEEE International Symposium on Medical Measurements and Applications, 2015. [Bibtex]
    @inproceedings{tobola2015,
    author  = {Tobola, Andreas and Espig, Chris and Streit, Franz and Korpok, Oliver and Leutheuser, Heike and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Fischer, Georg},
    title  = {Scalable ECG hardware and algorithms for extended runtime of wearable sensors},
    booktitle  = {{IEEE International Symposium on Medical Measurements and Applications}},
    year  = {2015},
    month  = {01},
    day  = {05},
    doi  = {10.1109/MeMeA.2015.7145209},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1717},
    }
  • [DOI] M. Hierold, S. Ripperger, D. Josic, F. Mayer, R. Weigel, and A. Koelpin, "Low-Weight Wireless Sensor Network for Encounter Detection of Bats" in IEEE Topical Meeting on Wireless Sensors and Sensor Networks, 2015, pp. 11-13. [Bibtex]
    @inproceedings{hierold2015,
    author  = {Hierold, Martin and Ripperger, Simon and Josic, Darija and Mayer, Frieder and Weigel, Robert and Koelpin, Alexander},
    title  = {Low-Weight Wireless Sensor Network for Encounter Detection of Bats},
    booktitle  = {{IEEE Topical Meeting on Wireless Sensors and Sensor Networks}},
    year  = {2015},
    month  = {01},
    pages  = {11--13},
    doi  = {10.1109/WISNET.2015.7127416},
    keywords  = {energy efficiency,wireless sensor network},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1409},
    abstract  = {In this paper a compact low weight wireless sensor node for proximity detection is presented. The energyefficient system design enables an operation time of more than 9 days at a total weight of the tag of less than 2 g. Test measurements in a colony of bats proof the applicability of the system for encounter detection of individual bats based on received signal strength measurements.},
    }
  • [DOI] S. Lindner, F. Barbon, S. Linz, F. Lurz, S. Mann, R. Weigel, and A. Koelpin, "ADC Depending Limitations for Six-Port Based Distance Measurement Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks 2015 (WiSNet), 2015, pp. 29-31. [Bibtex]
    @inproceedings{lindner2015,
    author  = {Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Lurz, Fabian and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {ADC Depending Limitations for Six-Port Based Distance Measurement Systems},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks 2015 (WiSNet)}},
    year  = {2015},
    month  = {01},
    day  = {25},
    pages  = {29--31},
    doi  = {10.1109/WISNET.2015.7127396},
    location  = {San Diego, CA, USA},
    publisher  = {IEEE},
    keywords  = {distance measurement,low-cost,radar,six-port,synchronous sampling,adc},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1406},
    abstract  = {This publication will show some considerations for selecting an appropriate analog-digital-converter (ADC) in Six-Port based radar systems for distance measurements. It will be discussed how the ADC resolution is limiting the overall system range resolution. Furthermore, configurations with non-synchronous sampling of the four baseband signals and their influences on the system performance will be investigated.},
    }
  • [DOI] S. Mann, S. Erhardt, S. Lindner, F. Lurz, S. Linz, F. Barbon, R. Weigel, and A. Koelpin, "Diode Detector Design for 61 GHz Substrate Integrated Waveguide Six-Port Radar Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2015, pp. 44-46. [Bibtex]
    @inproceedings{mann2015,
    author  = {Mann, Sebastian and Erhardt, Stefan and Lindner, Stefan and Lurz, Fabian and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {Diode Detector Design for 61 GHz Substrate Integrated Waveguide Six-Port Radar Systems},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2015},
    month  = {01},
    day  = {25},
    pages  = {44--46},
    doi  = {10.1109/WISNET.2015.7127415},
    location  = {San Diego, USA},
    publisher  = {IEEE},
    keywords  = {Detector,interferometer,,millimeter-wave,Six-Port,RADAR,phase measurement},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1601},
    abstract  = {Radar sensors play a key role in today’s industrial automation. Besides high accuracy, modern radar sensors have to feature high precision as well as challenging update rates. Six-Port wave correlators enable high phase resolution at high frequencies and therefore a high accuracy in radar applications. A Schottky diode detector applied to a substrate integrated waveguide (SIW) Six-Port is presented and measured. Furthermore, a displacement measurement using the SIW structure is performed.},
    }
  • [DOI] M. Dudek, I. Nasr, G. Bozsik, M. Hamouda, D. Kissinger, and G. Fischer, "System Analysis of a Phased-Array Radar Applying Adaptive Beam-Control for Future Automotive Safety Applications", IEEE Transactions on Vehicular Technology, vol. 64, iss. 1, pp. 34-47, 2015. [Bibtex]
    @article{dudek2015,
    author  = {Dudek, Manuel and Nasr, Ismail and Bozsik, Gabor and Hamouda, Mohammed and Kissinger, Dietmar and Fischer, Georg},
    title  = {System Analysis of a Phased-Array Radar Applying Adaptive Beam-Control for Future Automotive Safety Applications},
    journal  = {{IEEE Transactions on Vehicular Technology}},
    year  = {2015},
    month  = {01},
    pages  = {34--47},
    issn  = {0018-9545},
    doi  = {10.1109/TVT.2014.2321175},
    publisher  = {IEEE},
    volume  = {64},
    number  = {1},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1679},
    }
  • [DOI] J. Nehring, M. Bartels, R. Weigel, and D. Kissinger, "A Permittivity Sensitive Phase-Locked Loop Based on a Silicon-Integrated Capacitive Sensor for Microwave Biosensing Applications" in IEEE Topical Conference on Biomedical Wireless Technologies, Networks & Sensing Systems, 2015, pp. 1-3. [Bibtex]
    @inproceedings{nehring2015,
    author  = {Nehring, Johannes and Bartels, Melanie and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Permittivity Sensitive Phase-Locked Loop Based on a Silicon-Integrated Capacitive Sensor for Microwave Biosensing Applications},
    booktitle  = {{IEEE Topical Conference on Biomedical Wireless Technologies, Networks & Sensing Systems}},
    year  = {2015},
    month  = {01},
    pages  = {1--3},
    doi  = {10.1109/BIOWIRELESS.2015.7152114},
    location  = {San Diego},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1419},
    }
  • [DOI] F. Lurz, S. Mann, S. Linz, S. Lindner, F. Barbon, R. Weigel, and A. Koelpin, "A Low Power 24 GHz Radar System for Occupancy Monitoring" in IEEE Radio and Wireless Symposium (RWS), 2015, pp. 111-113. [Bibtex]
    @inproceedings{lurz2015,
    author  = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A Low Power 24 GHz Radar System for Occupancy Monitoring},
    booktitle  = {{IEEE Radio and Wireless Symposium (RWS)}},
    year  = {2015},
    month  = {01},
    pages  = {111--113},
    doi  = {10.1109/RWS.2015.7129719},
    location  = {San Diego, CA, USA},
    keywords  = {Doppler radar,occupancy sensor,low-power},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1622},
    abstract  = {This paper presents a low power 24 GHz Doppler radar system for presence detection and occupancy monitoring. It is based on a minimalistic hardware ap- proach and is able to wirelessly sense human respiratory signals so that even non-moving persons can be detected. By intermittently measuring, the average power consumption could be significantly reduced down to e.g. 0.2 mW for 20 measurements per second. Experiments verify that, due to the short wavelength, the single channel receiver limitations can be neglected when only a detection of human respiratory but no evaluation of the breathing frequency is necessary.},
    }
  • [DOI] M. Sporer, F. Lurz, E. Schlücker, R. Weigel, and A. Koelpin, "Underwater Interferometric Radar Sensor for Distance and Vibration Measurement" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), 2015, pp. 72-74. [Bibtex]
    @inproceedings{sporer2015,
    author  = {Sporer, Michael and Lurz, Fabian and Schlücker, Eberhard and Weigel, Robert and Koelpin, Alexander},
    title  = {Underwater Interferometric Radar Sensor for Distance and Vibration Measurement},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)}},
    year  = {2015},
    month  = {01},
    pages  = {72--74},
    doi  = {10.1109/WISNET.2015.7127405},
    location  = {San Diego, USA},
    publisher  = {IEEE},
    keywords  = {underwater distance sensor,interferometer},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1405},
    abstract  = {With the growing application of autonomous underwater vehicles (AUV) and underwater construction, i.e. robotic manipulator and maintenance systems, there is an increasing demand on precise underwater distance sensors. In this paper we present a low–cost, short–range and contactless sensor which uses electromagnetical (EM) waves for measuring distances underwater. The measurement system is based on interferometric radar applying a six– port interferometer and using EM waves at a frequency of 2.4GHz. Measurement series in fresh water have been carried out showing an precision of below 100 µm up to a distance of 35mm with only 8dBm of transmit power. Due to the high measurement rate the system can also be employed for vibration analysis. Additionally, by connecting a commercial 2.4GHz data transceiver, it is imaginable for the system to be simultaneously used for high data rate communication between e.g. AUV and unmanned underwater platforms (UUP).},
    }
  • [DOI] D. Kissinger, A. Schwarzmeier, F. Grimminger, J. Mena-Carrillo, W. Weber, G. Hofer, G. Fischer, and R. Weigel, "Wireless integrated sensor nodes for indoor monitoring and localization (invited)" in IEEE Topical Conference on Wireless Sensors and Sensor Networks, 2015, pp. 7-10. [Bibtex]
    @inproceedings{kissinger2015,
    author  = {Kissinger, Dietmar and Schwarzmeier, Andre and Grimminger, Florian and Mena-Carrillo, Juan and Weber, Werner and Hofer, Günter and Fischer, Georg and Weigel, Robert},
    title  = {Wireless integrated sensor nodes for indoor monitoring and localization (invited)},
    booktitle  = {{IEEE Topical Conference on Wireless Sensors and Sensor Networks}},
    year  = {2015},
    month  = {01},
    pages  = {7--10},
    doi  = {10.1109/WISNET.2015.7127397},
    location  = {San Diego, CA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1680},
    }
  • [DOI] S. Linz, F. Oesterle, A. Talai, S. Lindner, S. Mann, F. Barbon, R. Weigel, and A. Koelpin, "100 GHz Reflectometer for Sensitivity Analysis of MEMS Sensors Comprising an Intermediate Frequency Six-port Receiver" in 2015 IEEE Topical Conference on Wireless Sensors and Sensor Networks, 2015, pp. 20-22. [Bibtex]
    @inproceedings{linz2015,
    author  = {Linz, Sarah and Oesterle, Florian and Talai, Armin and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {100 GHz Reflectometer for Sensitivity Analysis of MEMS Sensors Comprising an Intermediate Frequency Six-port Receiver},
    booktitle  = {{2015 IEEE Topical Conference on Wireless Sensors and Sensor Networks}},
    year  = {2015},
    month  = {01},
    pages  = {20--22},
    doi  = {10.1109/WISNET.2015.7127403},
    location  = {San Diego, USA},
    publisher  = {IEEE},
    keywords  = {MEMS,Six-Port,Microwave Interferometer,W-band,Contactless Testing,Pull-in,Mechanical Sensitivity},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1403},
    abstract  = {Due to the growing market for Micro Electro Mechanical Systems (MEMS), especially for the application in mobile electronic devices like cameras, phones or tablet computers, cost and time efficient test and evaluation systems are required for the production process. This work presents a novel measurement setup for MEMS microphones, that allows an inline, contactless evaluation of the microphones' mechanical sensitivity at an early stage of the manufacturing process. A heterodyne receiver with a Six-port demodulator is deployed for displacement detection with micrometer resolution. Since the Six-port demodulator allows very high sampling rates only limited by the analog-to-digital converter, short measurement times can be achieved.},
    }
  • [DOI] J. Wecker, S. Kurth, G. Mangalgiri, M. Gaitzsch, T. Gessner, A. Bauch, I. Nasr, R. Weigel, D. Kissinger, A. Hackner, and U. Prechtel, "Oxygen detection system consisting of a millimeter wave Fabry-Pérot resonator and an integrated SiGe front-end" in SPIE Photonics West, 2015, pp. 1-4. [Bibtex]
    @inproceedings{wecker2015,
    author  = {Wecker, Julia and Kurth, Steffen and Mangalgiri, Gauri and Gaitzsch, Markus and Gessner, Thomas and Bauch, Andreas and Nasr, Ismail and Weigel, Robert and Kissinger, Dietmar and Hackner, Angelika and Prechtel, Ulrich},
    title  = {Oxygen detection system consisting of a millimeter wave Fabry-Pérot resonator and an integrated SiGe front-end},
    booktitle  = {{SPIE Photonics West}},
    year  = {2015},
    pages  = {1--4},
    doi  = {10.1117/12.2210915},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1901},
    }
  • D. Dudek, G. Fettweis, L. Frey, D. Kissinger, C. Kutter, W. Mathis, P. Lugli, P. Russer, R. Weigel, and I. Wolff, "Hidden Electronics", pp. 1-24, 2015. [Bibtex]
    @other{dudek2015a,
    author  = {Dudek, Damian and Fettweis, Gerhard and Frey, Lothar and Kissinger, Dietmar and Kutter, Christoph and Mathis, Wolfgang and Lugli, Paolo and Russer, Peter and Weigel, Robert and Wolff, Ingo},
    title  = {Hidden Electronics},
    booktitle  = {{Positionspapier des VDE}},
    year  = {2015},
    pages  = {1--24},
    url  = {https://www.vde.com/de/fg/gmm/news/documents/vde_pp_hidden\%20electronics_rz_web.pdf},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1903},
    }
  • [DOI] S. Lutz, C. Erhart, T. Walter, and R. Weigel, "8 Channel MIMO Long Range Radar Concept for Angular Estimation in Multi Target Scenarios" in ICMIM, 2015, pp. 1-4. [Bibtex]
    @inproceedings{lutz2015,
    author  = {Lutz, Steffen and Erhart, Christian and Walter, Thomas and Weigel, Robert},
    title  = {8 Channel MIMO Long Range Radar Concept for Angular Estimation in Multi Target Scenarios},
    booktitle  = {{ICMIM}},
    year  = {2015},
    pages  = {1--4},
    doi  = {10.1109/ICMIM.2015.7117955},
    location  = {Heidelberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1875},
    }
  • [DOI] M. Richter, A. Koelpin, T. Bosselman, and R. Weigel, "Electrical Fiber Optical Sensor for High-Voltage Applications" in Sensor+Test, 2015, pp. 804-806. [Bibtex]
    @inproceedings{richter2015,
    author  = {Richter, Markus and Koelpin, Alexander and Bosselman, Thomas and Weigel, Robert},
    title  = {Electrical Fiber Optical Sensor for High-Voltage Applications},
    booktitle  = {{Sensor+Test}},
    year  = {2015},
    pages  = {804--806},
    isbn  = {978-3-9813484-8-4},
    doi  = {10.5162/sensor2015/P5.3},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1895},
    }
  • J. Rupprecht, A. Oborovski, G. Mangalgiri, S. Kurth, M. Gaitzsch, A. Hackner, U. Prechtel, I. Nasr, R. Weigel, and D. Kissinger, "Spectral Gas Analysis in the Millimeter Wave Frequency Range" in Eurosensors, 2015, pp. 1-4. [Bibtex]
    @inproceedings{rupprecht2015,
    author  = {Rupprecht, Julia and Oborovski, Andreas and Mangalgiri, Gauri and Kurth, Steffen and Gaitzsch, Markus and Hackner, Angelika and Prechtel, Ulrich and Nasr, Ismail and Weigel, Robert and Kissinger, Dietmar},
    title  = {Spectral Gas Analysis in the Millimeter Wave Frequency Range},
    booktitle  = {{Eurosensors}},
    year  = {2015},
    pages  = {1--4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1897},
    }
  • [DOI] F. Dressler, S. Ripperger, M. Hierold, T. Nowak, C. Eibel, B. Cassens, F. Mayer, K. Meyer-Wegener, and A. Koelpin, "From Radio Telemetry to Ultra-Low Power Sensor Networks - Tracking Bats in the Wild", IEEE Communications Magazine, vol. 54, pp. 129-135, 2015. [Bibtex]
    @article{dressler2015,
    author  = {Dressler, Falko and Ripperger, Simon and Hierold, Martin and Nowak, Thorsten and Eibel, Christopher and Cassens, Björn and Mayer, Frieder and Meyer-Wegener, Klaus and Koelpin, Alexander},
    title  = {From Radio Telemetry to Ultra-Low Power Sensor Networks - Tracking Bats in the Wild},
    journal  = {{IEEE Communications Magazine}},
    year  = {2015},
    pages  = {129--135},
    issn  = {0163-6804},
    doi  = {10.1109/MCOM.2016.7378438},
    publisher  = {IEEE},
    volume  = {54},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1668},
    }
  • A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "Modellierung nass-chemischer Porosizierverfahren auf LTCC für elektromagnetische Hochfrequenz-Feldsimulation" in Mikrosystemtechnik-Kongress, 2015. [Bibtex]
    @inproceedings{talai2015d,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {Modellierung nass-chemischer Porosizierverfahren auf LTCC für elektromagnetische Hochfrequenz-Feldsimulation},
    booktitle  = {{Mikrosystemtechnik-Kongress}},
    year  = {2015},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1898},
    }

2014

  • [DOI] M. Hamouda, G. Guarin, M. Gardill, B. Lämmle, R. Weigel, D. Kissinger, and T. Ußmüller, "A clock synchronization for M-sequence-based ultra-wideband systems", IEEE Transactions on Microwave Theory and Techniques, vol. 62, iss. 12, pp. 3549-3561, 2014. [Bibtex]
    @article{hamouda2014c,
    author  = {Hamouda, Mohammed and Guarin, Gustavo and Gardill, Markus and Lämmle, Benjamin and Weigel, Robert and Kissinger, Dietmar and Ußmüller, Thomas},
    title  = {A clock synchronization for M-sequence-based ultra-wideband systems},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2014},
    month  = {12},
    pages  = {3549--3561},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2014.2364676},
    publisher  = {IEEE},
    volume  = {62},
    number  = {12},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1633},
    }
  • [DOI] A. Tobola, O. Korpok, H. Leutheuser, B. Schmitz, C. Hofmann, M. Struck, C. Weigand, B. Eskofier, A. Heuberger, and G. Fischer, "System design impacts on battery runtime of wearable medical sensors" in Mobile and Information Technologies in Medicine and Health, Proceedings (MobileMed), 2014, pp. 1-4. [Bibtex]
    @inproceedings{tobola2014,
    author  = {Tobola, Andreas and Korpok, Oliver and Leutheuser, Heike and Schmitz, Björn and Hofmann, Christian and Struck, Matthias and Weigand, Christian and Eskofier, Björn and Heuberger, Albert and Fischer, Georg},
    title  = {System design impacts on battery runtime of wearable medical sensors},
    booktitle  = {{Mobile and Information Technologies in Medicine and Health, Proceedings (MobileMed)}},
    year  = {2014},
    month  = {11},
    pages  = {1--4},
    doi  = {10.13140/2.1.3516.8969},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1718},
    }
  • [DOI] S. O. Tatu, A. Serban, M. Helaoui, and A. Koelpin, "Multiport Technology: The New Rise of an Old Concept", IEEE Microwave Magazine, vol. 15, iss. 7, pp. 34-44, 2014. [Bibtex]
    @article{tatu2014a,
    author  = {Tatu, Serioja Ovidiu and Serban, Adriana and Helaoui, Mohamed and Koelpin, Alexander},
    title  = {Multiport Technology: The New Rise of an Old Concept},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2014},
    month  = {11},
    pages  = {34--44},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2014.2356149},
    publisher  = {IEEE},
    volume  = {15},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1707},
    }
  • D. Kissinger, "Wireless technologies for grand challenges (guest editorial)", IEEE Microwave Magazine, vol. 15, iss. 7, pp. 4-5, 2014. [Bibtex]
    @article{kissinger2014,
    author  = {Kissinger, Dietmar},
    title  = {Wireless technologies for grand challenges (guest editorial)},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2014},
    month  = {11},
    pages  = {4--5},
    issn  = {1527-3342},
    publisher  = {IEEE},
    volume  = {15},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1632},
    }
  • G. Gottardo, "Hybrid Recursive Active Filters for Frequency Agile Architectures" in COMORA, Cognitive Mobile Radio Workshop - Kognitive Drahtlose Kommunikationssysteme Abschluss Workshop, 2014. [Bibtex]
    @inproceedings{gottardo2014a,
    author  = {Gottardo, Giuseppe},
    title  = {Hybrid Recursive Active Filters for Frequency Agile Architectures},
    booktitle  = {{COMORA, Cognitive Mobile Radio Workshop - Kognitive Drahtlose Kommunikationssysteme Abschluss Workshop}},
    year  = {2014},
    month  = {11},
    day  = {10},
    location  = {Berlin},
    keywords  = {Active filter,feedback amplifier,base station,stability analysis,interference suppression,feedback amplifier,cavity resonators},
    url  = {http://www.comora.de/index.php?id=47},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1695},
    }
  • [DOI] F. Lurz, S. Lindner, S. Mann, S. Linz, F. Barbon, R. Weigel, and A. Koelpin, "A Low-Cost 2.4 GHz Frequency Measurement System for Microsecond Time Domain Pulses Based on Six-Port Technology" in 44th European Microwave Week, 2014, pp. 171-174. [Bibtex]
    @inproceedings{lurz2014,
    author  = {Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A Low-Cost 2.4 GHz Frequency Measurement System for Microsecond Time Domain Pulses Based on Six-Port Technology},
    booktitle  = {{44th European Microwave Week}},
    year  = {2014},
    month  = {10},
    pages  = {171--174},
    doi  = {10.1109/EuMC.2014.6986397},
    location  = {Rome, Italy},
    publisher  = {EuMA},
    keywords  = {Frequency measurement,Delay line,Six-Port},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1257},
    abstract  = {This paper presents a fast responding frequency measurement system based on Six-Port technology being able to determine precisely the frequency of very short time domain pulses of 1 μs and even less in the 2.4 GHz ISM band. By using a delay line the frequency measurement can be reduced to a phase measurement that can be quickly evaluated by the Six-Port network implemented with lumped components. Measurements show that the delay line, currently realized by a SMA cable, is extremely sensitive to temperature variations even in the range of 0.1 K. Thus, a temperature compensation method based on reference measurements is proposed and final measurements show that the system can reach a calibrated and temperature compensated error of only a few parts per million (ppm).},
    }
  • [DOI] S. Linz, G. Vinci, S. Lindner, S. Mann, F. Lurz, F. Barbon, R. Weigel, and A. Koelpin, "I/Q Imbalance Compensation for Six-Port Interferometers in Radar Applications" in European Microwave Conference (EuMC) 2014, 2014, pp. 746-749. [Bibtex]
    @inproceedings{linz2014b,
    author  = {Linz, Sarah and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Lurz, Fabian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {I/Q Imbalance Compensation for Six-Port Interferometers in Radar Applications},
    booktitle  = {{European Microwave Conference (EuMC) 2014}},
    year  = {2014},
    month  = {10},
    pages  = {746--749},
    doi  = {10.1109/EuMC.2014.6986542},
    location  = {Rome, Italy},
    publisher  = {IEEE},
    keywords  = {Six-Port,Ellipse,IQ Imbalance,Interferometer},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1251},
    abstract  = {Six-port interferometers are of great interest for displacement and vibration measurements in industrial as well as medical applications. However, they show offsets as well as amplitude and phase imbalances in their differential in-phase and quadrature signals, leading to inaccuracies of the measured displacement. If a very slow moving or vibrating target has to be monitored, an additional phase shifter for calibration is needed, so that the system’s errors can be compensated. A method for calculation and compensation of errors is presented and a compact and cost-efficient implementation of a phase shifter for 24 GHz Six-port interferometers is shown.},
    }
  • [DOI] A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "A Permittivity Characterization Method by Detuned Ring-Resonators for Bulk Materials up to 110 GHz" in Proceedings of the European Microwave Conference 2014, 2014, pp. 124-127. [Bibtex]
    @inproceedings{talai2014f,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {A Permittivity Characterization Method by Detuned Ring-Resonators for Bulk Materials up to 110 GHz},
    booktitle  = {{Proceedings of the European Microwave Conference 2014}},
    year  = {2014},
    month  = {10},
    pages  = {124--127},
    doi  = {10.1109/EuMC.2014.6986385},
    location  = {Rom, Italien},
    publisher  = {IEEE},
    keywords  = {Bulk material,detuned resonator,frequency shift,material characterization,permittivity,ring resonator},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1230},
    abstract  = {An accurate characterization of microwave materials is essential for reliable high frequency circuit design. This paper presents a measurement setup, which enables a quick and accurate determination of the relative permittivity of dielectric bulk materials up to 110 GHz. A ring-resonator is manufactured on a well characterized substrate dealing as reference resonator. The Material Under Test (MUT) is placed on top of the ring, which increases the effective permittivity and therefore introduces a shift of the resonance frequency of the resonator. Electromagnetic field simulations with different heights and relative permittivities of the MUT provide a lookup table for the measured resonance frequencies. The functionality of the proposed measurement setup is validated by measurement results of different MUTs.},
    }
  • [DOI] M. Sporer, R. Weigel, and A. Koelpin, "Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage" in European Radar Conference, 2014, pp. 380-383. [Bibtex]
    @inproceedings{sporer2014,
    author  = {Sporer, Michael and Weigel, Robert and Koelpin, Alexander},
    title  = {Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage},
    booktitle  = {{European Radar Conference}},
    year  = {2014},
    month  = {10},
    pages  = {380--383},
    doi  = {10.1109/EuRAD.2014.6991287},
    location  = {Rome, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1253},
    abstract  = {In wireless short-range underwater communication a trend towards higher operating frequencies and bandwidth can be noticed in order to increase channel capacity and throughput. For launching electromagnetic waves typically low-directive wire antennas are employed. In this work a new kind of underwater antenna is presented for the 2.4GHz industrial, scientific and medical (ISM) band, based on a dielectric filled open-ended waveguide. The antenna is designed as impedance matching transformer allowing a connection of conventional 50Ohm coaxial cables. The measured 10dB bandwidth in fresh water is approx. 550MHz (22\%). Compared to a conventional monopole antenna an increase in receive power of approx. 14 dB can be achieved.},
    }
  • [DOI] M. Sporer, R. Weigel, and A. Koelpin, "Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage" in European Microwave Week, 2014, pp. 1683-1686. [Bibtex]
    @inproceedings{sporer2014a,
    author  = {Sporer, Michael and Weigel, Robert and Koelpin, Alexander},
    title  = {Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage},
    booktitle  = {{European Microwave Week}},
    year  = {2014},
    month  = {10},
    pages  = {1683--1686},
    doi  = {10.1109/EuMC.2014.6986779},
    location  = {Rome, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1822},
    abstract  = {In wireless short-range underwater communication a trend towards higher operating frequencies and bandwidth can be noticed in order to increase channel capacity and throughput. For launching electromagnetic waves typically low-directive wire antennas are employed. In this work a new kind of underwater antenna is presented for the 2.4GHz industrial, scientific and medical (ISM) band, based on a dielectric filled open-ended waveguide. The antenna is designed as impedance matching transformer allowing a connection of conventional 50Ohm coaxial cables. The measured 10dB bandwidth in fresh water is approx. 550MHz (22\%). Compared to a conventional monopole antenna an increase in receive power of approx. 14 dB can be achieved.},
    }
  • [DOI] A. Schwarzmeier, N. Roth, R. Weigel, G. Fischer, and D. Kissinger, "A Fall Detection and Activity Monitoring Algorithm for a Tele-Care System Supporting Dementia and Alzheimer Patients" in BMT 2014 - 48. Jahrestagung der DGBMT, 2014. [Bibtex]
    @inproceedings{schwarzmeier2014a,
    author  = {Schwarzmeier, Andre and Roth, Nils and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Fall Detection and Activity Monitoring Algorithm for a Tele-Care System Supporting Dementia and Alzheimer Patients},
    booktitle  = {{BMT 2014 - 48. Jahrestagung der DGBMT}},
    year  = {2014},
    month  = {10},
    doi  = {10.1515/bmt-2014-4100},
    location  = {Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1325},
    abstract  = {Dementia and Alzheimer patients who show a “wandering” behaviour combined with excessive activity and unsteady gait are exposed to a particular risk of dangerous falls. Fast and efficient help in case of such an emergency could be provided by a tele-care system comprising a mobile back-plaster as an on-body sensor node that is equipped with sen-sors which not only capture activity and movement data from the patient but also enable indoor and outdoor localiza-tion. This node is linked to an internet server infrastructure including a back-end software. In order to enhance the care quality reliable algorithms for activity monitoring and fall detection are needed.},
    }
  • [DOI] A. Oborovski, M. Hofmann, R. Weigel, and D. Kissinger, "Multi-Octave Planar Microwave Slot-Coupled Directional Coupler up to 28 GHz with Novel Phase Velocity Compensation" in European Microwave Conference 2014, 2014, p. 4. [Bibtex]
    @inproceedings{oborovski2014,
    author  = {Oborovski, Andreas and Hofmann, Maximilian and Weigel, Robert and Kissinger, Dietmar},
    title  = {Multi-Octave Planar Microwave Slot-Coupled Directional Coupler up to 28 GHz with Novel Phase Velocity Compensation},
    booktitle  = {{European Microwave Conference 2014}},
    year  = {2014},
    month  = {10},
    day  = {07},
    pages  = {4},
    doi  = {10.1109/EuMC.2014.6986373},
    location  = {Rome, Italy},
    keywords  = {Directional Coupler, Passive Microwave Circuits, Wideband},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1402},
    abstract  = {A nonuniform symmetrical QTEM-mode directional slot-line coupler operating in a multi-octave frequency range from 2.5 GHz up to 28.6 GHz is presented. The calculated continuously varying even- and odd-mode line impedances are realized by a 3D electromagnetic (EM) field simulation of the slot-coupled microstrip cross section. A new method of even- and odd-mode phase velocity compensation, based on a continuously structured prepreg, is suggested. A -8.34 dB coupling factor is achieved, showing a low amplitude and phase imbalance up to 28 GHz. Furthermore, a tandem configuration is evaluated by utilizing two -8.34 dB directional coupler to form a wideband -3.01 dB coupler.},
    }
  • [DOI] J. Nehring, M. Schütz, R. Weigel, and D. Kissinger, "A Microwave Permittivity Sensing System based on a Hybrid Heterodyne Reflectometer Circuit" in European Microwave Conference, 2014, pp. 159-162. [Bibtex]
    @inproceedings{nehring2014b,
    author  = {Nehring, Johannes and Schütz, Martin and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Microwave Permittivity Sensing System based on a Hybrid Heterodyne Reflectometer Circuit},
    booktitle  = {{European Microwave Conference}},
    year  = {2014},
    month  = {10},
    pages  = {159--162},
    doi  = {10.1109/EuMC.2014.6986394},
    location  = {Rome, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1332},
    }
  • [DOI] A. Gharib, A. Talai, R. Weigel, and D. Kissinger, "A 1.16 pJ/bit 80 Gb/s 2\^11 -1 PRBS generator in SiGe bipolar technology" in European Microwave Integrated Circuits Conference (EuMIC), 2014, pp. 277-280. [Bibtex]
    @inproceedings{gharib2014a,
    author  = {Gharib, Ahmed and Talai, Armin and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 1.16 pJ/bit 80 Gb/s 2\^{}11 -1 PRBS generator in SiGe bipolar technology},
    booktitle  = {{European Microwave Integrated Circuits Conference (EuMIC)}},
    year  = {2014},
    month  = {10},
    pages  = {277--280},
    doi  = {10.1109/EuMIC.2014.6997846},
    location  = {Rome, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1417},
    }
  • [DOI] S. Lindner, F. Barbon, S. Linz, S. Mann, R. Weigel, and A. Koelpin, "Distance Measurements Based on Guided Wave 24 GHz Dual Tone Six-Port Radar" in 11th European Radar Conference (EuRAD), 2014, pp. 57-60. [Bibtex]
    @inproceedings{lindner2014,
    author  = {Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Distance Measurements Based on Guided Wave 24 GHz Dual Tone Six-Port Radar},
    booktitle  = {{11th European Radar Conference (EuRAD)}},
    year  = {2014},
    month  = {10},
    day  = {05},
    pages  = {57--60},
    doi  = {10.1109/EuRAD.2014.6991206},
    location  = {Rom},
    publisher  = {IEEE},
    keywords  = {distance measurement,interferometry,phase measurement,radar,Six-Port,Waveguide},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1255},
    abstract  = {In the following, a continuous wave (cw) radar system based on the Six-Port principle will be shown for measurement tasks at enclosed systems needing micrometer accuracy as well as high update rates like tank level monitoring or hydraulic cylinder piston control. To exceed the ambiguity limit of such an interferometric system a dual tone approach is used, extending the unambiguity range to several wavelengths. The system will be presented with measurement results at 24 GHz within a WR42 waveguide to prove the feasibility of the proposed concept.},
    }
  • [DOI] Y. Can and G. Fischer, "Orthogonalizing Boolean Subtraction of Minterms or Ternary Vectors" in International Conference on Computational and Experimental Science and Engineering (ICCESEN), 2014. [Bibtex]
    @inproceedings{can2014,
    author  = {Can, Yavuz and Fischer, Georg},
    title  = {Orthogonalizing Boolean Subtraction of Minterms or Ternary Vectors},
    booktitle  = {{International Conference on Computational and Experimental Science and Engineering (ICCESEN)}},
    year  = {2014},
    month  = {10},
    doi  = {10.12693/APhysPolA.128.B-388},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1600},
    }
  • [DOI] A. Cattaneo, S. Pinarello, J. Müller, and R. Weigel, "Frequency Response of Stress-Effects on CMOS Power Amplifiers" in IEEE International Integrated Reliability Workshop Final Report (IIRW), 2014, pp. 79-81. [Bibtex]
    @inproceedings{cattaneo2014a,
    author  = {Cattaneo, Andrea and Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    title  = {Frequency Response of Stress-Effects on CMOS Power Amplifiers},
    booktitle  = {{IEEE International Integrated Reliability Workshop Final Report (IIRW)}},
    year  = {2014},
    month  = {10},
    pages  = {79--81},
    doi  = {10.1109/IIRW.2014.7049515},
    location  = {South Lake Tahoe, CA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1789},
    abstract  = {RF Power Amplifiers (PAs) undergo to high electrical stress conditions due to strong lateral field along the channel. Reliability of CMOS PAs is largely studied in literature. Generally is focused in understanding how RF stress can harm the device. Many authors proved that the generation of defects does not have a frequency dependency. In this work the problem is faced from a new point of view. The response of the defects, instead of the generation, is studied over frequency. It is demonstrated that the electrons-trapping by interface states is quenched by increasing the operation frequency. As a consequence the performance of the PA are recovered. This finding points out for the first time the possibility of relaxing the reliability constrains when operating in RF regime.},
    }
  • [DOI] F. Barbon, S. Lindner, S. Mann, S. Linz, A. Koelpin, and R. Weigel, "Extended Range Distance Measurements Based on Frequency and Power Compensated Six-Port Receiver" in European Microwave Conference 2014, 2014, pp. 742-745. [Bibtex]
    @inproceedings{barbon2014a,
    author  = {Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Koelpin, Alexander and Weigel, Robert},
    title  = {Extended Range Distance Measurements Based on Frequency and Power Compensated Six-Port Receiver},
    booktitle  = {{European Microwave Conference 2014}},
    year  = {2014},
    month  = {10},
    pages  = {742--745},
    doi  = {10.1109/EuMC.2014.6986541},
    publisher  = {EUMA},
    keywords  = {Six-Port,Frequency estimation,long range,radar},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1248},
    abstract  = {Six-Port interferometers for distance measurement show a low cost solution able to operate in harsh environment where other solutions are not suitable. The increase of the distance range requires new calibration strategies in order to compensate the signals’ high dynamic power range. Here, an enhanced Six-Port receiver is presented having the capability of sensing the frequency of the reference signal and featuring a dynamic compensation of the power levels of the signals fed to the interferometer. These attributes allow the receiver to increase the distance detection range.},
    }
  • [DOI] J. Walk, J. Weber, C. Söll, R. Weigel, G. Fischer, and T. Ußmüller, "Remote powered medical implants for Telemonitoring (Invited Paper)", Proceedings of the IEEE, vol. 102, iss. 10, pp. 100-116, 2014. [Bibtex]
    @article{walk2014,
    author  = {Walk, Jasmin and Weber, Jasmin and Söll, Christopher and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    title  = {Remote powered medical implants for Telemonitoring (Invited Paper)},
    journal  = {{Proceedings of the IEEE}},
    year  = {2014},
    month  = {10},
    pages  = {100--116},
    issn  = {0018-9219},
    doi  = {10.1109/JPROC.2014.2359517},
    publisher  = {IEEE},
    keywords  = {biological tissues,biomedical communication,biomedical power supplies,energy storage,frequency domain analysis,implantable biomedical devices,permittivity},
    volume  = {102},
    number  = {10},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1314},
    abstract  = {Chronicle diseases like diabetes mellitus often need a permanent monitoring of vital signs. Especially the use of telemedicine might increase the quality of life for concerned patients. New systems are required which permanently detect and provide health status information. But, these systems must not control patient’s life and shall work autonomous. For this purpose, intelligent medical implants are well qualified. The present work describes a system for wireless power supply and communication with medical implant applications. Monitoring vital signs might lead to a big amount of data. Therefore, high data rates are necessary provided by high operating frequencies. High frequencies in turn lead to high attenuation losses because of the frequency dependent relative permittivity $\epsilon_r$ of the human body. Hence, high frequencies are not suitable for energy transfer through the human body. The presented concept is based on two different frequencies for power supply and data transmission. An independent devel- opment of both blocks is possible. The power supply operates on 13.56 MHz using inductive coupling. Thereby, the human body doesn’t affect the energy transfer. In contrast, the data transmission is operated by a frequency of the Medical Implant Communication Service band. The elaborated system consists of an power supply unit, a data transmission unit and a control unit. The implementation of the power supply and data transmission as well as associated theoretical basics are presented. Performed measurements demonstrate that the realized system is qualified for the use on human beings.},
    }
  • [DOI] I. Nasr, H. Knapp, K. Aufinger, R. Weigel, and D. Kissinger, "A 50-100-GHz Highly Integrated Octave-Bandwidth Transmitter and Receiver Chipset in 0.35um SiGe Technology", IEEE Transactions on Microwave Theory and Techniques, vol. 62, iss. 9, pp. 2118-2131, 2014. [Bibtex]
    @article{nasr2014,
    author  = {Nasr, Ismail and Knapp, Herbert and Aufinger, Klaus and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 50-100-GHz Highly Integrated Octave-Bandwidth Transmitter and Receiver Chipset in 0.35um SiGe Technology},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2014},
    month  = {09},
    pages  = {2118--2131},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2014.2337289},
    publisher  = {IEEE},
    volume  = {62},
    number  = {9},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1598},
    abstract  = {This work presents a highly integrated transmitter (TX) and receiver (RX) chipset operating from 50 to 100 GHz. The local oscillator (LO) is realized using a high output power millimeter-wave integrated frequency synthesizer with an octave output frequency range. The proposed low-complexity discrete tuned synthesizer architecture employs a single wide-tuning range voltage-controlled oscillator core and a single-sideband mixer, which can be switched to operate as a LO amplifier. An ultra broadband variable gain amplifier, with a gain control range $>{hbox {25 dB}}$, is used at the output of the synthesizer to provide a tunable output power. A maximum output power from $+{hbox{7}}$ to $+{hbox{12 dBm}}$ and an output phase noise from $-{hbox{83}}$ to $-{hbox{96 dBc/Hz}}$ at 1-MHz offset are measured over the complete output frequency range. Moreover, a spurious suppression $>{hbox {22 dB}}$ is achieved over the entire synthesizer's tuning range. The RX shows a conversion gain $>{hbox {19 dB}}$ and a noise figure $< {hbox {9.5 dB}}$ from 50 to 100 GHz. The TX's measured saturated output power is from $ +{hbox{6}}$ to $-{hbox{1 dBm}}$ over the entire frequency range. The complete chipset is realized in a commercial low-cost SiGe:C technology with an $f- {t}/f_{max}$ of ${hbox{170/250 GHz}}$. Each of the TX and RX chips including the frequency synthesizers draw a current of 370 mA from a 3.3-V supply.},
    }
  • [DOI] I. Nasr, J. Nehring, K. Aufinger, G. Fischer, R. Weigel, and D. Kissinger, "Single- and Dual-Port 50-100-GHz Integrated Vector Network Analyzers With On-Chip Dielectric Sensors", IEEE Transactions on Microwave Theory and Techniques, vol. 62, iss. 9, pp. 2168-2179, 2014. [Bibtex]
    @article{nasr2014a,
    author  = {Nasr, Ismail and Nehring, Johannes and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Single- and Dual-Port 50-100-GHz Integrated Vector Network Analyzers With On-Chip Dielectric Sensors},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2014},
    month  = {09},
    pages  = {2168--2179},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2014.2337264},
    publisher  = {IEEE},
    volume  = {62},
    number  = {9},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1597},
    abstract  = {This work presents a single- and dual-port fully integrated millimeter-wave ultra-broadband vector network analyzer. Both circuits, realized in a commercial ${hbox{0.35-}}mu{hbox {m}}$ SiGe:C technology with an $f_{t}/f_{max}$ of ${hbox{170/250 GHz}}$, cover an octave frequency bandwidth between 50–100 GHz. The presented chips can be configured to measure complex scattering parameters of external devices or determine the permittivity of different materials using an integrated millimeter-wave dielectric sensor. Both devices are based on a heterodyne architecture that achieves a receiver dynamic range of 57–72.5 dB over the complete design frequency range. Two integrated frequency synthesizer modules are included in each chip that enable the generation of the required test and local-oscillator millimeter-wave signals. A measurement $3sigma $ statistical phase error lower than 0.3$\^{}{circ}$ is achieved. Automated measurement of changes in the dielectric properties of different materials is demonstrated using the proposed systems. The single- and dual-port network analyzer chips have a current consumption of 600 and 700 mA, respectively, drawn from a single 3.3-V supply.},
    }
  • [DOI] J. Brendel, S. Rieß, S. Schröter, R. Weigel, and G. Fischer, "Signal detection and cooperative sensing with sensor nodes with limited dynamic" in IEEE International Workshop on Cognitive Cellular Systems (CCS), 2014, pp. 1-5. [Bibtex]
    @inproceedings{brendel2014a,
    author  = {Brendel, Johannes and Rieß, Steffen and Schröter, Simon and Weigel, Robert and Fischer, Georg},
    title  = {Signal detection and cooperative sensing with sensor nodes with limited dynamic},
    booktitle  = {{IEEE International Workshop on Cognitive Cellular Systems (CCS)}},
    year  = {2014},
    month  = {09},
    pages  = {1--5},
    doi  = {10.1109/CCS.2014.6933788},
    location  = {Rhine River, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1410},
    abstract  = {The paper investigates the performance of the energy detector in fading environments under the constraint, that each sensor has only a limited dynamic range. First, the effects which limit the dynamic of a sensor node are discussed before the influence on the energy detector is analyzed. Simulations are presented how cooperative spectrum sensing affects the detection probability and it is shown that a sensing network with limited dynamic can gain much more from cooperation compared to a sensor network with ideal sensor nodes.},
    }
  • [DOI] A. Tag, D. Karolewski, B. Bader, M. Pitschi, R. Weigel, and A. Hagelauer, "Influence of Dissipated Power Distribution on BAW Resonators" in 2014 IEEE International Ultrasonics Symposium, 2014, pp. 2627-2630. [Bibtex]
    @inproceedings{tag2014b,
    author  = {Tag, Andreas and Karolewski, Dominik and Bader, Bernhard and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    title  = {Influence of Dissipated Power Distribution on BAW Resonators},
    booktitle  = {{2014 IEEE International Ultrasonics Symposium}},
    year  = {2014},
    month  = {09},
    day  = {03},
    pages  = {2627--2630},
    doi  = {10.1109/ULTSYM.2014.0656},
    location  = {Chicago, Illinois, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1399},
    abstract  = {Background, Motivation and Objective: Bulk Acoustic Wave (BAW) filters and Duplexers are often used at high power levels at which the temperature of the device increases due to power dissipation (self-heating) resulting in turn in significant frequency shifts of the transfer function of the device. This behavior needs to be modeled accurately to be able to design devices working appropriately at these power levels. Statement of Contribution/Methods: Simulations with coupled electromagnetic (EM) acoustic thermal 3D finite element methods (FEM) require tremendously high calculation times. The solutions presented in the literature are based on a measured TCF and dissipated power calculated from S-parameters. That means neither the distribution of temperature nor the distribution of the dissipated power are considered. In our previously work, we have shown that the modeling of the frequency shifts caused by the self-heating behavior can be improved by taking the spatial temperature distribution into account. In this work, it will be shown for the first time that the spatial distribution of dissipated power considerably influence the temperature level and temperature distribution. Therefore, it has to be taken into account in order precisely model the BAW self-heating behavior. Results, Discussion and Conclusions: The acoustic was modeled in one dimension allowing efficient calculation times. EM has been modeled with a 3D FEM simulation program. From the obtained strain distribution along the different layers of the resonator (an example is shown in Fig. 1) the spatial distribution of viscous losses along the different layers was calculated and transferred to the thermal 3D simulation. The remaining main losses (eddy currents, redistribution currents, resistivity losses, and dielectric losses) were applied to the electrodes and piezoelectric layer. The result of the thermal simulation was the spatial temperature distribution over the device geometry. This temperature distribution was used to modify the geometry of the resonator and the materials for the EM and acoustic simulations. Finally, the acoustic and EM simulations were repeated with all the modifications providing the behavior of the resonator at high power level. By the extension of the modeling approach remarkable improvements (some tens of percents) in the modeling of the temperature level and the resonator transfer function frequency shifts have been achieved.},
    }
  • [DOI] C. Si, J. An, T. Lan, T. Ußmüller, L. Wang, and Q. Wu, "On the Equality Constraint Tolerance of Constrained Optimization Problems", Theoretical Computer Science, vol. 551, pp. 55-65, 2014. [Bibtex]
    @article{si2014,
    author  = {Si, Chengyong and An, Jing and Lan, Tian and Ußmüller, Thomas and Wang, Lei and Wu, Qidi},
    title  = {On the Equality Constraint Tolerance of Constrained Optimization Problems},
    journal  = {{Theoretical Computer Science}},
    year  = {2014},
    month  = {09},
    pages  = {55--65},
    issn  = {0304-3975},
    doi  = {10.1016/j.tcs.2014.05.012},
    publisher  = {North Holland Publishing},
    keywords  = {Constrained optimization,Constraint handling techniques,Equality constraints tolerance,Particle Swarm Optimization,Ranking methods},
    volume  = {551},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1572},
    abstract  = {The tolerance value plays an important role when converting equality constraints into inequality constraints in solving Constrained Optimization Problems. Many researchers use a fixed or dynamic setting directly based on trial or experiments without systematic study. As a well-known constraint handling technique, Deb's feasibility-based rule is widely adopted, but it has one drawback as the ranking is not consistent with the actual ranking after introducing the tolerance value. After carefully analyzing how the tolerance value influences the ranking difference, a novel strategy named Ranking Adjustment Strategy (RAS) is proposed, which can be considered as a complement of Deb's feasibility-based rule. The experiment has verified the effectiveness of the proposed strategy. This is the first time to analyze the inner mechanism of the tolerance value for equality constraints systematically, which can give some guide for future research.},
    }
  • [DOI] T. Ußmüller, A. Hagelauer, and R. Weigel, "Technologies for RFID sensors and sensor tags," in Green RFID Systems, L. Roselli, Ed., Cambridge University Press, 2014. [Bibtex]
    @inbook{ussmueller2014,
    author  = {Ußmüller, Thomas and Hagelauer, Amelie and Weigel, Robert},
    editor  = {Roselli, Luca},
    title  = {Technologies for RFID sensors and sensor tags},
    booktitle  = {{Green RFID Systems}},
    year  = {2014},
    month  = {09},
    isbn  = {978-1-107-03040-4},
    doi  = {10.1017/CBO9781139343459.005},
    publisher  = {Cambridge University Press},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1701},
    }
  • [DOI] A. Cattaneo, S. Pinarello, J. Müller, and R. Weigel, "MOSFET degradation under DC and RF Fowler-Nordheim stress" in 44th European Solid State Device Research Conference (ESSDERC), 2014, pp. 230-233. [Bibtex]
    @inproceedings{cattaneo2014,
    author  = {Cattaneo, Andrea and Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    title  = {MOSFET degradation under DC and RF Fowler-Nordheim stress},
    booktitle  = {{44th European Solid State Device Research Conference (ESSDERC)}},
    year  = {2014},
    month  = {09},
    pages  = {230--233},
    doi  = {10.1109/ESSDERC.2014.6948802},
    location  = {Venice},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1790},
    abstract  = {Fowler-Nordheim (F-N) stress is reported to be one of the most severe wear-out mechanisms for high-frequency MOSFET applications like PAs and RF switches. Previous studies of this degradation process were limited to the DC-static case only and standard empirical models were proposed. In this work a novel general physical model is developed, which correctly describes the ageing of electrical parameters under DC stress. This is made possible by taking into account the hole injection into the gate oxide. Finally this study extends the understanding of F-N degradation to RF regime. In this case a quasi-static sum of the degradation rate is adopted to accurately model and predict the performance worsening; the wear-out shows no frequency dependency in the range up to 4Ghz.},
    }
  • M. Gardill, D. Kay, R. Weigel, and A. Koelpin, "Numerical Investigations on the Quasi-Stationary Response of Antennas to Wideband LFMCW Excitation" in European Signal Processing Conference (EUSIPCO), 2014, pp. 969-973. [Bibtex]
    @inproceedings{gardill2014a,
    author  = {Gardill, Markus and Kay, D. and Weigel, Robert and Koelpin, Alexander},
    title  = {Numerical Investigations on the Quasi-Stationary Response of Antennas to Wideband LFMCW Excitation},
    booktitle  = {{European Signal Processing Conference (EUSIPCO)}},
    year  = {2014},
    month  = {09},
    pages  = {969--973},
    location  = {Lissabon, Portugal},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1254},
    abstract  = {In this contribution, we numerically investigate if the quasi-stationary response is a valid approximation for the response of antennas excited by wideband linear-frequency modulated continuous waveforms. We give results for two idealized example systems, showing how the validity of the quasi-stationary response is dependent on the system's resonant behavior, and that the error between exact output and quasi-stationary response is approximately linearly dependent on the sweeprate of the linear-frequency modulated excitation. We then conduct our simulations for a realistic wideband radar system operating from 5 GHz to 8 GHz, and using impulse responses extracted from electromagnetic simulations of a dipole and a biconical antenna.},
    }
  • [DOI] N. Franchi, M. Kloc, and R. Weigel, "SDR-Proved Adaptive OFDM Guard Interval Scheme for Rapidly Varying Time-Dispersive Vehicular Broadcast Channels" in 6th IEEE International Symposium on Wireless Vehicular Communications (WiVeC), 2014, pp. 1-5. [Bibtex]
    @inproceedings{franchi2014,
    author  = {Franchi, Norman and Kloc, Matej and Weigel, Robert},
    title  = {SDR-Proved Adaptive OFDM Guard Interval Scheme for Rapidly Varying Time-Dispersive Vehicular Broadcast Channels},
    booktitle  = {{6th IEEE International Symposium on Wireless Vehicular Communications (WiVeC)}},
    year  = {2014},
    month  = {09},
    day  = {14},
    pages  = {1--5},
    doi  = {10.1109/WIVEC.2014.6953259},
    location  = {Vancouver, Canada},
    publisher  = {IEEE Vehicular Technology Society},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1424},
    abstract  = {Driven by the results of existing field measurements for the characterization of vehicular radio channels, particularly vehicle-to-vehicle (V2V) channels, which showed that the effective range of possible maximum delay spreads is extremely wide (ranging from a few ns up to several μs), the strategic choice of Orthogonal Frequency Division Multiplexing (OFDM) with fixed guard interval (GI) duration shall be reconsidered at that point. Here, the major claims, both to optimize the data throughput at good channel conditions and to enable a reliable transmission of safety critical information at harsh environmental conditions, must be taken into account. Thus, in this paper, an adaptive guard interval (AGI) length scheme in context of vehicular ad hoc broadcast communication networks with rapidly time-varying channel conditions is proposed. The approach enables an OFDM symbol-based GI estimation without the prior knowledge of the GI length used in the transmitted symbol. By this means different GI lengths can be detected even within a frame. The suggested approach could be used to improve actual and upcoming physical layer (PHY) specifications, e.g. of Std. IEEE 802.11p. For a physically realistic evaluation of the proposed scheme, a fully IEEE 802.11p standard-compliant and reconfigurable softwaredefined radio (SDR) transmitter with symbol-based adaptable GI processing but fixed symbol duration is presented.},
    }
  • [DOI] A. Gabiger-Rose, M. Kube, R. Weigel, and R. Rose, "An FPGA-Based Fully Synchronized Design of a Bilateral Filter for Real-Time Image Denoising", IEEE Transactions on Industrial Electronics, vol. 61, iss. 8, pp. 4093-4104, 2014. [Bibtex]
    @article{gabiger-rose2014,
    author  = {Gabiger-Rose, Anna and Kube, Matthias and Weigel, Robert and Rose, Richard},
    title  = {An FPGA-Based Fully Synchronized Design of a Bilateral Filter for Real-Time Image Denoising},
    journal  = {{IEEE Transactions on Industrial Electronics}},
    year  = {2014},
    month  = {08},
    pages  = {4093--4104},
    issn  = {0278-0046},
    doi  = {10.1109/TIE.2013.2284133},
    publisher  = {IEEE},
    keywords  = {Bilateral filter,field-programmable gate array (FPGA)},
    volume  = {61},
    number  = {8},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1239},
    abstract  = {In this paper, a detailed description of a synchronous field-programmable gate array implementation of a bilateral filter for image processing is given. The bilateral filter is chosen for one unique reason: It reduces noise while preserving details. The design is described on register-transfer level. The distinctive feature of our design concept consists of changing the clock domain in a manner that kernel-based processing is possible, which means the processing of the entire filter window at one pixel clock cycle. This feature of the kernel-based design is supported by the arrangement of the input data into groups so that the internal clock of the design is a multiple of the pixel clock given by a targeted system. Additionally, by the exploitation of the separability and the symmetry of one filter component, the complexity of the design is widely reduced. Combining these features, the bilateral filter is implemented as a highly parallelized pipeline structure with very economical and effective utilization of dedicated resources. Due to the modularity of the filter design, kernels of different sizes can be implemented with low effort using our design and given instructions for scaling. As the original form of the bilateral filter with no approximations or modifications is implemented, the resulting image quality depends on the chosen filter parameters only. Due to the quantization of the filter coefficients, only negligible quality loss is introduced.},
    }
  • [DOI] A. Stöckle, S. Lutz, A. Talai, and G. Fischer, "A New Approach For A Dual-Polarized Low Cost Patch Antenna With Low Cross- Polarization, High Bandwidth And High Isolation" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, 2014, pp. 357-360. [Bibtex]
    @inproceedings{stoeckle2014,
    author  = {Stöckle, Andreas and Lutz, Steffen and Talai, Armin and Fischer, Georg},
    title  = {A New Approach For A Dual-Polarized Low Cost Patch Antenna With Low Cross- Polarization, High Bandwidth And High Isolation},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications}},
    year  = {2014},
    month  = {08},
    pages  = {357--360},
    doi  = {10.1109/APWC.2014.6905556},
    location  = {Palm Beach, Aruba},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1397},
    abstract  = {In this paper a new approach for a dual- polarized broadband patch antenna is presented. A novel feeding approach enables a high -10dB band- width up to 21 \% as well as an isolation more than -29 dB. The realized antenna gain is > 6 dBi in the frequency range of 1320 MHz to 1680 MHz. Addi- tional, due to the re ector shaping, a low back ra- diation is achieved. Since standard components and FR4 material are used, the antenna concept enables an e ective low cost antenna production.},
    }
  • [DOI] G. Vinci, S. Linz, and A. Koelpin, "Estimation Error Analysis and Compensation of Dual Six-Port based DOA Detection" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications 2014, 2014, pp. 217-220. [Bibtex]
    @inproceedings{vinci2014a,
    author  = {Vinci, Gabor and Linz, Sarah and Koelpin, Alexander},
    title  = {Estimation Error Analysis and Compensation of Dual Six-Port based DOA Detection},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications 2014}},
    year  = {2014},
    month  = {08},
    pages  = {217--220},
    isbn  = {978-1-4673-5690-9},
    doi  = {10.1109/APWC.2014.6905543||10.1109/APWC.2014.6905543},
    location  = {Aruba},
    publisher  = {IEEE},
    keywords  = {DOA,Dual Six-Port},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1350},
    abstract  = {-},
    }
  • [DOI] S. Linz, G. Vinci, S. Lindner, S. Mann, F. Lurz, F. Barbon, R. Weigel, and A. Koelpin, "Evaluation of the Impact of Antenna Parameters on the Performance of Six-Port Radar" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications 2014, 2014, pp. 300-303. [Bibtex]
    @inproceedings{linz2014a,
    author  = {Linz, Sarah and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Lurz, Fabian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {Evaluation of the Impact of Antenna Parameters on the Performance of Six-Port Radar},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications 2014}},
    year  = {2014},
    month  = {08},
    pages  = {300--303},
    isbn  = {978-1-4673-5692-3},
    doi  = {10.1109/APWC.2014.6905552},
    location  = {Aruba},
    publisher  = {IEEE},
    keywords  = {Six-Port,Antenna,Offset,Radar},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1293},
    }
  • [DOI] S. O. Tatu, A. Serban, A. Koelpin, and M. Helaoui, "Multiport Technology: New Perspectives and Applications", Journal of Electrical and Computer Engineering, vol. 2014, iss. Article ID 194649, pp. 1-4, 2014. [Bibtex]
    @article{tatu2014,
    author  = {Tatu, Serioja Ovidiu and Serban, Adriana and Koelpin, Alexander and Helaoui, Mohamed},
    title  = {Multiport Technology: New Perspectives and Applications},
    journal  = {{Journal of Electrical and Computer Engineering}},
    year  = {2014},
    month  = {07},
    pages  = {1--4},
    issn  = {2090-0147},
    doi  = {10.1155/2014/194649},
    publisher  = {Hindawi Publishing Corporation},
    keywords  = {Six-Port},
    volume  = {2014},
    number  = {Article ID 194649},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1428},
    }
  • S. Erhardt, "Entwicklung und Aufbau von Teilkomponenten für ein 61 GHz ISM-Band Radarsystem in Substrate Integrated Waveguide-Technologie," Masterarbeit Master Thesis, 2014. [Bibtex]
    @mastersthesis{erhardt2014,
    author  = {Erhardt, Stefan},
    title  = {Entwicklung und Aufbau von Teilkomponenten für ein 61 GHz ISM-Band Radarsystem in Substrate Integrated Waveguide-Technologie},
    booktitle  = {{}},
    year  = {2014},
    month  = {07},
    day  = {09},
    keywords  = {Substrate Integrated Waveguide,Radar,61 GHz,ISM-Band},
    type  = {Masterarbeit},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1677},
    }
  • [DOI] J. Brendel, S. Rieß, S. Schröter, and G. Fischer, "Noise Floor Dependent Data Fusion for Reliable REM Generation with a Spectrum Sensing Grid" in IEEE Symposium on Computers and Communications (ISCC 2014), 2014. [Bibtex]
    @inproceedings{brendel2014,
    author  = {Brendel, Johannes and Rieß, Steffen and Schröter, Simon and Fischer, Georg},
    title  = {Noise Floor Dependent Data Fusion for Reliable REM Generation with a Spectrum Sensing Grid},
    booktitle  = {{IEEE Symposium on Computers and Communications (ISCC 2014)}},
    year  = {2014},
    month  = {06},
    doi  = {10.1109/ISCC.2014.6912496},
    location  = {Funchal, Portugal},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1348},
    abstract  = {For several years the cognitive radio (CR) technology is under research as promising solution supporting the efficient utilization of the scarce radio frequency spectrum. The cognitive cycle enables the adaptation of operating parameters according to observations made from the environment. A radio environment map (REM) which contains data from spectrum sensing devices was identified to be an adequate tool to realize CR systems. In this contribution the challenges in generating a REM from sensor nodes with limited dynamic range is pointed out. Afterwards, the noise floor dependent data fusion (NDDF) algorithm is proposed. It is able to generate a reliable REM in a fusion center of a sensing grid. The algorithm merges spectrum measurements from collocated sensor nodes to reduce the amount of data whilst preserving all advantages gained from macro diversity by taking into account the noise floor of each sensor. The algorithm has been verified with measurements in the laboratory and a measurement study at the fairground of Berlin shows the applicability of the NDDF algorithm.},
    }
  • G. Vinci, S. Linz, S. Mann, S. Lindner, F. Barbon, R. Weigel, and A. Koelpin, "A Six-Port Radar System for Precise Distance Measurements and Vibration Monitoring in Industrial Environments" in 17. ITG / GMA Fachtagung Sensoren und Messsysteme, 2014, 2014, pp. 1-5. [Bibtex]
    @inproceedings{vinci2014,
    author  = {Vinci, Gabor and Linz, Sarah and Mann, Sebastian and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A Six-Port Radar System for Precise Distance Measurements and Vibration Monitoring in Industrial Environments},
    booktitle  = {{17. ITG / GMA Fachtagung Sensoren und Messsysteme, 2014}},
    year  = {2014},
    month  = {06},
    pages  = {1--5},
    isbn  = {978-3-8007-3622-5},
    location  = {Nuremberg, Germany},
    publisher  = {VDE},
    keywords  = {Six-Port,Radar,Vibration Monitoring,Industrial Environments,compact sensor},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1349},
    abstract  = {The Six-Port receiver has been subject of several investigations in the last years especially for radar applications in different areas, from accurate contactless vibration analysis, through automotive radar calibration to remote breath and heartbeat monitoring. The advantages of the Six-Port receiver such as excellent phase discrimination, trivial signal processing and low circuit complexity as well as cost, are the features that lead the radar industry to further development of this technology. A joint project involving the University of Erlangen-Nuremberg and InnoSenT GmbH (Innovative Sensor Technology), led to the development of a highly accurate, compact and versatile Six-Port radar module aiming at a reliable high-integration of all subcomponents such as antenna, Six-Port front-end, baseband circuitry and digital signal processing.},
    }
  • [DOI] M. Hamouda, B. Lämmle, G. Fischer, R. Weigel, and T. Ußmüller, "A Cross Correlation Based Clock Synchronization up to 10GHz for Ultra-Wideband Sensing Systems" in IEEE International Microwave Symposium, 2014, pp. 1-4. [Bibtex]
    @inproceedings{hamouda2014b,
    author  = {Hamouda, Mohammed and Lämmle, Benjamin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Cross Correlation Based Clock Synchronization up to 10GHz for Ultra-Wideband Sensing Systems},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2014},
    month  = {06},
    pages  = {1--4},
    doi  = {10.1109/MWSYM.2014.6848541},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1235},
    }
  • [DOI] A. Gharib, R. Weigel, and D. Kissinger, "A 70 GHz bandwidth low-power active balun employing common-collector resisitive feedback in 0.35 um bipolar SiGe technology" in IEEE MTT-S International Microwave Symposium, 2014, pp. 1-3. [Bibtex]
    @inproceedings{gharib2014,
    author  = {Gharib, Ahmed and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 70 GHz bandwidth low-power active balun employing common-collector resisitive feedback in 0.35 um bipolar SiGe technology},
    booktitle  = {{IEEE MTT-S International Microwave Symposium}},
    year  = {2014},
    month  = {06},
    pages  = {1--3},
    doi  = {10.1109/MWSYM.2014.6848528},
    location  = {Tampa, FL},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1415},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A 20-Gbps Low Jitter Analog Clock Recovery Circuit for Ultra Wide Band Radio Systems" in IEEE International Symposium on Circuits and Systems, 2014, pp. 1516-1519. [Bibtex]
    @inproceedings{hamouda2014a,
    author  = {Hamouda, Mohammed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A 20-Gbps Low Jitter Analog Clock Recovery Circuit for Ultra Wide Band Radio Systems},
    booktitle  = {{IEEE International Symposium on Circuits and Systems}},
    year  = {2014},
    month  = {06},
    pages  = {1516--1519},
    doi  = {10.1109/ISCAS.2014.6865435},
    location  = {Florida, USA},
    keywords  = {PLL, UWB, Radio, radar},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1233},
    }
  • A. Tag, J. Leinhos, G. Hechtfischer, M. Leibfritz, and T. Eibert, "Design, Simulation and Fabrication of Broadband Coaxial Matched Loads for the Frequency Range from 0 to 110 GHz", International Journal of Microwave and Wireless Technologies, 2014. [Bibtex]
    @article{tag2014a,
    author  = {Tag, Andreas and Leinhos, Jens and Hechtfischer, Gerd and Leibfritz, Martin and Eibert, Thomas},
    title  = {Design, Simulation and Fabrication of Broadband Coaxial Matched Loads for the Frequency Range from 0 to 110 GHz},
    journal  = {{International Journal of Microwave and Wireless Technologies}},
    year  = {2014},
    month  = {06},
    issn  = {1759-0787},
    publisher  = {Cambridge University Press},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1262},
    abstract  = {Combining a theory for reflection-free termination of coaxial lines together with a novel manufacturing method results in 1-mm coaxial matched loads with an excellent absorption behavior over the frequency range from 0 to 110 GHz. Three different electromagnetic simulation approaches verify the capability of these matched loads to achieve reflection coefficients smaller than −43 dB over the entire frequency range. Matched loads with a maximum reflection coefficient of only −32 dB have been produced. The excellent performance was achieved by exponentially tapering the outer conductor over the region of a coaxial ceramic substrate coated by a thin film resistance and by compensation for EM wave propagation inside the resistive coating.},
    }
  • [DOI] A. Tag, D. Karolewski, C. Huck, B. Bader, M. Pitschi, W. Wagner, C. Schäffel, R. Weigel, and A. Hagelauer, "Influence of Temperature Distribution on Behavior, Modeling, and Reliability of BAW Resonators" in IEEE International Reliability Physics Symposium, 2014, p. 5C.5.1--5C.5.7. [Bibtex]
    @inproceedings{tag2014,
    author  = {Tag, Andreas and Karolewski, Dominik and Huck, Christian and Bader, Bernhard and Pitschi, Maximilian and Wagner, W. and Schäffel, Christoph and Weigel, Robert and Hagelauer, Amelie},
    title  = {Influence of Temperature Distribution on Behavior, Modeling, and Reliability of BAW Resonators},
    booktitle  = {{IEEE International Reliability Physics Symposium}},
    year  = {2014},
    month  = {06},
    pages  = {5C.5.1--5C.5.7},
    doi  = {10.1109/IRPS.2014.6860669},
    location  = {Waikoloa, HI, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1263},
    }
  • [DOI] S. Mann, F. Lurz, S. Lindner, F. Barbon, S. Linz, R. Weigel, and A. Koelpin, "61 GHz Millimeter Wave Voltage Variable Attenuator Based on Flip-Chip Mounted PIN-Diodes" in 20th International Conference on Microwaves, Radar, and Wireless Communications, 2014, pp. 1-4. [Bibtex]
    @inproceedings{mann2014b,
    author  = {Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {61 GHz Millimeter Wave Voltage Variable Attenuator Based on Flip-Chip Mounted PIN-Diodes},
    booktitle  = {{20th International Conference on Microwaves, Radar, and Wireless Communications}},
    year  = {2014},
    month  = {06},
    pages  = {1--4},
    doi  = {10.1109/MIKON.2014.6899966},
    location  = {Gdansk, Poland},
    keywords  = {61 GHz,attenuator,bias network,p-i-n diode,reflection type,variable attenuator},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1388},
    abstract  = {Abstract—Voltage Variable Attenuators play a major role in radio frequency system design. In this paper, a voltage variable attenuator concept suitable for the 61GHz ISM band is introduced and discussed. The proposed reflection type voltage variable attenuator has a maximum attenuation of 32 dB in the 61 GHz ISM-band range, and a low phase-shift of less than 10 for low and medium attenuation values. Furthermore, a bias network is presented featuring low reflection loss, and robustness against manufacturing tolerances. For verification purposes, a voltage variable attenuator as well as a reference transmission line have been fabricated and measured.},
    }
  • [DOI] A. Koelpin and R. Weigel, "Six-Port Based Direction Finding and Ranging" in 20th International Conference on Microwaves, Radar, and Wireless Communications, 2014, pp. 1-5. [Bibtex]
    @inproceedings{koelpin2014b,
    author  = {Koelpin, Alexander and Weigel, Robert},
    title  = {Six-Port Based Direction Finding and Ranging},
    booktitle  = {{20th International Conference on Microwaves, Radar, and Wireless Communications}},
    year  = {2014},
    month  = {06},
    pages  = {1--5},
    doi  = {10.1109/MIKON.2014.6899826},
    location  = {Gdansk, Poland},
    keywords  = {Six-Port,Direction Finding,AoA,Ranging,Radar},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1369},
    abstract  = {The Six-Port concept is known since decades as a precise device for complex valued signal handling. It has shown its functionality for metrology applications as well as for broadband I/Q data reception. Due to its extraordinary phase resolution and low cost implementation two specific industrial applications get more and more into focus: Six-Port based distance measurements and direction finding. In this paper a review on this promising concept will be given for both, ranging and angle of incident detection featuring sub-millimeter range resolution and measurement value update rates in the two digit kilohertz range. Furthermore, similarities and differences of Six-Port technology with common radar concepts will be discussed.},
    }
  • [DOI] F. Trenz, M. Hofmann, R. Weigel, G. Fischer, and D. Kissinger, "Compact 2-28 GHz Planar Multi-Octave Bandwidth Wilkinson Power Dividers" in 2014 IEEE MTT-S International Microwave Symposium (IMS), 2014, pp. 1-4. [Bibtex]
    @inproceedings{trenz2014,
    author  = {Trenz, Florian and Hofmann, Maximilian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Compact 2-28 GHz Planar Multi-Octave Bandwidth Wilkinson Power Dividers},
    booktitle  = {{2014 IEEE MTT-S International Microwave Symposium (IMS)}},
    year  = {2014},
    month  = {06},
    pages  = {1--4},
    doi  = {10.1109/MWSYM.2014.6848660},
    location  = {Tampa, Florida, USA},
    publisher  = {IEEE},
    keywords  = {Wilkinson power divider,broadband},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1404},
    abstract  = {In this paper, two broadband Wilkinson power dividers in microstrip technology are presented. A broadband operation from 2 to 28 GHz could be achieved by a multisectional layout. The dividers differ in the number of cascaded steps, which allows application dependent usage. Furthermore, the dividers make use of commercially available, surface mounted thinfilmresistors, allowing a straightforward implementation. The maximum occupied area is around 30mm2 for the longer version and around 16mm2 for the shorter version. Measurements show a matching better than 13 dB and an isolation of better than 10 dB over the whole frequency range. The achieved bandwidth ratio of 14:1 represents, in combination with the compact layout, the highest ratio for Wilkinson dividers published so far.},
    }
  • D. Vlad, G. Fischer, and M. Hänel, "Commissioning And First Beam Measurements With A New Beam Diagnostics For Medical Electron Accelerators" in Proceedings of the International Particle Accelerator Conference, 2014. [Bibtex]
    @inproceedings{vlad2014,
    author  = {Vlad, Daniel and Fischer, Georg and Hänel, Marc},
    title  = {Commissioning And First Beam Measurements With A New Beam Diagnostics For Medical Electron Accelerators},
    booktitle  = {{Proceedings of the International Particle Accelerator Conference}},
    year  = {2014},
    month  = {06},
    location  = {Dresden, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1396},
    }
  • [DOI] A. Koelpin, S. Linz, F. Barbon, S. Lindner, S. Mann, F. Lurz, and R. Weigel, "Selftest Strategies for Microwave Interferometry for High-Precision Industrial Distance Measurements" in 20th International Conference on Microwaves, Radar, and Wireless Communications, 2014. [Bibtex]
    @inproceedings{koelpin2014a,
    author  = {Koelpin, Alexander and Linz, Sarah and Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Lurz, Fabian and Weigel, Robert},
    title  = {Selftest Strategies for Microwave Interferometry for High-Precision Industrial Distance Measurements},
    booktitle  = {{20th International Conference on Microwaves, Radar, and Wireless Communications}},
    year  = {2014},
    month  = {06},
    doi  = {10.1109/MIKON.2014.6899991},
    location  = {Gdansk, Poland},
    keywords  = {Six-Port,Selftest},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1370},
    abstract  = {Microwave interferometry is a tool for precisely measuring distances or vibrations of a target in industrial applications. Distance resolutions in the range of few micrometers and measurement value update rates of several tens of kilohertz are feasible. These parameters can only be achieved, if careful compensation of non-ideal effects is conducted. In this paper the basics of Six-Port based microwave interferometry as well as selftest techniques will be presented. Exemplarily, linearization of the operating point of the diode detectors and frequency estimation of the radar signal will be shown.},
    }
  • [DOI] T. Fersch, R. Weigel, R. Quaglia, M. Pirola, G. Ghione, and V. Camarchia, "A 2-watt, 0.15-µm GaAs pHEMT stacked amplifier at 22 GHz" in MIKON, 2014, pp. 1-4. [Bibtex]
    @inproceedings{fersch2014,
    author  = {Fersch, Thomas and Weigel, Robert and Quaglia, Roberto and Pirola, Marco and Ghione, Giovanni and Camarchia, Vittorio},
    title  = {A 2-watt, 0.15-µm GaAs pHEMT stacked amplifier at 22 GHz},
    booktitle  = {{MIKON}},
    year  = {2014},
    month  = {06},
    pages  = {1--4},
    doi  = {10.1109/MIKON.2014.6899880},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1872},
    }
  • S. Linz, F. Barbon, S. Mann, S. Lindner, F. Lurz, R. Weigel, and A. Koelpin, "Detector Design for Six-Port Radar" in CST European User Conference 2014, 2014. [Bibtex]
    @inproceedings{linz2014,
    author  = {Linz, Sarah and Barbon, Francesco and Mann, Sebastian and Lindner, Stefan and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    title  = {Detector Design for Six-Port Radar},
    booktitle  = {{CST European User Conference 2014}},
    year  = {2014},
    month  = {05},
    location  = {Berlin, Germany},
    publisher  = {CST Computer Simulation Technology AG},
    keywords  = {Six-Port,Radar,Power Detector},
    url  = {https://www.cst.com/Content/Events/Downloads/euc2014/5.4.1.pdf},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1264},
    abstract  = {The Six-port receiver has been intensively investigated in the last decades. Now, a first prototype Six-port radar sensor is available on the market. There is a great demand from the industry for the Six-port radar for applications like level metering, vibration analysis or positioning. A critical component of the Six-port radar is the detector. Good matching is necessary to avoid crosstalk between the four detectors of the Six-port and a perfect RF-short is needed to terminate the diode. In this talk, the design workflow for Schottky diode power detectors will be demonstrated. A first circuit design and simulation is done with Agilent Advanced Design System. The layout is imported into CST Microwave Studio as DXF file. By using a technology file, the 3D structure can be automatically generated. The results of both, time and frequency domain simulation, are compared with measurement results. With a circuit simulation in CST Design Studio comprising the Microwave Studio block, the manufacturer’s SPICE model is compared with measured S-Parameters of the Schottky diode. By using the diode’s measured S-Parameters and the frequency domain solver, a good agreement between simulation and measurement of the detector can be achieved.},
    }
  • [DOI] U. Schwerthöffer, R. Weigel, and D. Kissinger, "Highly sensitive microwave resonant near-field sensor for precise aqueous glucose detection in microfluidic medical applications" in IEEE Instrumentation and Measurement Technology Conference, 2014, pp. 919-922. [Bibtex]
    @inproceedings{schwerthoeffer2014,
    author  = {Schwerthöffer, Udo and Weigel, Robert and Kissinger, Dietmar},
    title  = {Highly sensitive microwave resonant near-field sensor for precise aqueous glucose detection in microfluidic medical applications},
    booktitle  = {{IEEE Instrumentation and Measurement Technology Conference}},
    year  = {2014},
    month  = {05},
    pages  = {919--922},
    doi  = {10.1109/I2MTC.2014.6860876},
    location  = {Montevideo, Uruguay},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1414},
    }
  • [DOI] A. Hartmann, R. Strzoda, R. Schrobenhauser, and R. Weigel, "Ultra-compact TDLAS humidity measurement cell with advanced signal processing", Applied Physics B: Lasers and Optics, vol. 115, iss. 2, pp. 263-268, 2014. [Bibtex]
    @article{hartmann2014a,
    author  = {Hartmann, Alexander and Strzoda, Rainer and Schrobenhauser, Robert and Weigel, Robert},
    title  = {Ultra-compact TDLAS humidity measurement cell with advanced signal processing},
    journal  = {{Applied Physics B: Lasers and Optics}},
    year  = {2014},
    month  = {05},
    pages  = {263--268},
    issn  = {1432-0649},
    doi  = {10.1007/s00340-013-5599-7},
    publisher  = {Springer-Verlag},
    volume  = {115},
    number  = {2},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1586},
    abstract  = {In this paper, tunable diode laser absorption spectroscopy humidity measurements with an ultra-compact measurement cell are presented. The optical path length is 2 cm. The system uses a vertical cavity surface emitting laser at 1.854 μm. The main limiting factor of the humidity resolution is not the noise but interference fringes produced by reflecting surfaces. Next to the system setup, a novel rejection method to eliminate these fringes, based on Fourier domain analysis of the absorption line, is described. In contrast to other fringe rejection methods, the presented method is able to handle fringes, whose free spectral range is in the range of the half width of the absorption line. The achievable humidity resolution for the presented cell is below 0.25 \% relative humidity at room temperature.},
    }
  • A. Talai, B. Gmeiner, R. Weigel, and A. Koelpin, "Electromagnetic Analysis of Fringed Microstrip Lines on Dense and Porosified LTCC" in Computer Simulation Technology - European User Conference 2014, 2014, pp. 1-20. [Bibtex]
    @inproceedings{talai2014e,
    author  = {Talai, Armin and Gmeiner, Björn and Weigel, Robert and Koelpin, Alexander},
    title  = {Electromagnetic Analysis of Fringed Microstrip Lines on Dense and Porosified LTCC},
    booktitle  = {{Computer Simulation Technology - European User Conference 2014}},
    year  = {2014},
    month  = {05},
    pages  = {1--20},
    location  = {Berlin, Germany},
    publisher  = {CST Computer Simulation Technology AG},
    url  = {https://www.cst.com/Content/Events/Downloads/euc2014/5.4.2.pdf},
    note  = {presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1265},
    abstract  = {The shapes of microstrip line edges comprise a large influence on various microwave circuitry characteristics. Therefore, the edges of thick film gold conductor tracks have been analyzed by scanning electron microscopy and rebuilt in 3D according to the measured fringing dimensions of co-fired and post-fired conductor tracks on Low Temperature Cofired Ceramic (LTCC). Subsequent time-domain field simulations with CST from 0 GHz to 110 GHz reveal the influence of fringed conductor edges on metallization loss, scattering parameters and the effective permittivity, which will be presented. Simulations of fringed Microstrips on porosified LTCC are compared to the dense case. It is shown that fraying has less impact on porosified LTCC, since the relative permittivity at the near-surface region is strongly reduced by the introduced air.},
    }
  • [DOI] M. Gardill, R. Weigel, and A. Koelpin, "Ultra-Wideband Small Modular Array Antenna Based on Column-Coupled Vivaldi Subarrays" in European Conference on Antennas and Propagation, 2014, pp. 3629-3633. [Bibtex]
    @inproceedings{gardill2014,
    author  = {Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    title  = {Ultra-Wideband Small Modular Array Antenna Based on Column-Coupled Vivaldi Subarrays},
    booktitle  = {{European Conference on Antennas and Propagation}},
    year  = {2014},
    month  = {04},
    pages  = {3629--3633},
    doi  = {10.1109/EuCAP.2014.6902616},
    location  = {den Haag, Netherlands},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1240},
    abstract  = {In this contribution an ultra-wideband small array antenna for direction-of-arrival (DOA) estimation in low-cost industrial radar applications operating in the frequency range from 5 GHz - 8 GHz is designed by using column-coupled Vivaldi subarray modules. Compared to traditional ultra-wideband antenna arrays consisting of inherently wideband antenna elements, the proposed design procedure utilizes mutual coupling (MC) across the antenna elements to reduce the antenna element size, to simultaneously improve the subarray module return loss, and to allow for relatively small element spacing in the plane of DOA estimation. In contrast to state-of-the-art tightly-coupled ultra-wideband antenna arrays consisting of a large number of very small array elements on a regular grid-spacing, the proposed solution only relies on MC across four antenna elements along each array column. It hence provides UWB characteristics with a small number of antenna elements, it can easily be interfaced with a low-cost 4-RX channel radar fronted and allows for arbitrary linear array geometries such as non-uniform element spacing optimized for DOA estimation. We characterize the array and discuss MC aspects and DOA estimation results based on measured array data.},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "Ultra Wide Band Power Amplifier for Miniaturized Antennas" in International Wireless Symposium, 2014, pp. 1-4. [Bibtex]
    @inproceedings{hamouda2014,
    author  = {Hamouda, Mohammed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Ultra Wide Band Power Amplifier for Miniaturized Antennas},
    booktitle  = {{International Wireless Symposium}},
    year  = {2014},
    month  = {03},
    pages  = {1--4},
    doi  = {10.1109/IEEE-IWS.2014.6864260},
    location  = {Xian, China},
    keywords  = {UWB, amplifier},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1232},
    }
  • [DOI] G. Gottardo, G. Donati, C. Musolff, R. Weigel, and G. Fischer, "Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends" in German Microwave Conference, 2014, pp. 1-4. [Bibtex]
    @inproceedings{gottardo2014,
    author  = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Weigel, Robert and Fischer, Georg},
    title  = {Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends},
    booktitle  = {{German Microwave Conference}},
    year  = {2014},
    month  = {03},
    day  = {12},
    pages  = {1--4},
    doi  = {10.1109/MMM.2013.2288713},
    location  = {Aachen},
    publisher  = {IEEE},
    keywords  = {Active filter,feedback amplifier,base station,stability analysis,interference suppression,band-pass filters,cavity resonators},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1238},
    abstract  = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. In order to reduce the size of these filters a novel hybrid system using a power amplifier and a negative digital feedback for frequency band GSM900 is studied. A model to describe the hybrid system is investigated and the relation between phase and resonance peaks in the transfer function is described. An attenuation of 5.4 dB for the closed loop transfer function is reached. The stability condition of the system is here presented using Nyquist criterion as an important step for its future feasibility.},
    }
  • [DOI] J. Röber, A. Bänisch, T. Ußmüller, G. Fischer, and R. Weigel, "Frequency Synthesizer for Digital Satellite Radio Receiving Systems" in IEEE International Wireless Symposium (IWS) 2014, 2014. [Bibtex]
    @inproceedings{roeber2014,
    author  = {Röber, Jürgen and Bänisch, Andreas and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    title  = {Frequency Synthesizer for Digital Satellite Radio Receiving Systems},
    booktitle  = {{IEEE International Wireless Symposium (IWS) 2014}},
    year  = {2014},
    month  = {03},
    doi  = {10.1109/IEEE-IWS.2014.6864267},
    location  = {Xi'an China},
    publisher  = {IEEE},
    keywords  = {PLL,Synthesizer,Mixed-Signal,VCO,AAC,Behavioral Modeling,Diversity},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1237},
    abstract  = {This paper describes the design and verification of phase lock loop (PLL) components within the framework of a front-end for digital satellite radio diversity reception. First, the functionality of the implemented PLL is described by a block diagram. Second, individual PLL components are presented and analysed. Altogether a voltage controlled oscillator (VCO), an automatic amplitude control (AAC), a buffer stage, a TSCP logic as well as a DCVSL-R high-speed by-two-divider, a multimodulus divider (MMD), and a phase-frequency detector are developed. The frequency tuning range of the PLL is between 4.34 and 4.70 GHz and hence the VCO tuning range has to be around 4 to 5 GHz. Beyond this, the VCO’s post-layout phase noise is -100.50 dBc/Hz at 1 MHz under nominal environmental conditions and the post-layout yield analysis predicts 99.773\%. Additionally, the VCO and the AAC are connected. Due to that additional AAC feedback circuit, the current consumption as well as the VCO output amplitude decrease. The overall system simulation shows the settling process of the PLL for the tri-state and the five-state mode of the PFD. Finally the VCO performance is compared with other state-of-the-art LC-VCOs.},
    }
  • [DOI] A. Talai, F. Steinhäußer, B. Gmeiner, M. Wegener, A. Bittner, U. Schmid, A. Roosen, A. Koelpin, and R. Weigel, "Electromagnetic Analysis of Conductor Track Surface Roughnesses from 1 GHz to 110 GHz" in International Conference on Electromagnetics in Advanced Applications (ICEAA), 2014, pp. 415-418. [Bibtex]
    @inproceedings{talai2014d,
    author  = {Talai, Armin and Steinhäußer, Frank and Gmeiner, Björn and Wegener, M. and Bittner, Achim and Schmid, Ulrich and Roosen, Andreas and Koelpin, Alexander and Weigel, Robert},
    title  = {Electromagnetic Analysis of Conductor Track Surface Roughnesses from 1 GHz to 110 GHz},
    booktitle  = {{International Conference on Electromagnetics in Advanced Applications (ICEAA)}},
    year  = {2014},
    month  = {03},
    day  = {18},
    pages  = {415--418},
    doi  = {10.1109/ICEAA.2014.6903887},
    location  = {Palm Beach, Aruba},
    publisher  = {IEEE},
    keywords  = {Surface Rougness},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1301},
    }
  • [DOI] A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "A simplified equivalent model for microwave characteristics of porosified LTCC" in General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI, 2014, pp. 1-4. [Bibtex]
    @inproceedings{talai2014b,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {A simplified equivalent model for microwave characteristics of porosified {LTCC}},
    booktitle  = {{General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI}},
    year  = {2014},
    month  = {02},
    day  = {20},
    pages  = {1--4},
    doi  = {10.1109/URSIGASS.2014.6929397},
    location  = {Peking, China},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1260},
    abstract  = {High frequency materials show a manifold variety of complex permittivities for different applications. Recent research results demonstrated that porosification of Low Temperature Cofired Ceramics (LTCC) represents a new manufacturing technology, which enables local selective reduction of the relative permittivity. The permittivity gradients were measured and subsequently modeled to perform electromagnetic field simulations. The results of the complex CAD model are used, to create a simplified equivalent model, which is suitable for rapid RF circuit design on porosified LTCC. Since substrate properties vary between circuit components, the substrate-dependency on the lumped elements of the transmission line model is considered. It is shown that the introduced porosification gradient can be considered for network-based SPICE simulations on porous LTCC.},
    }
  • [DOI] C. Musolff, M. Kamper, Z. Abou-Chahine, and G. Fischer, "Linear and efficient Doherty PA Revisited", IEEE Microwave Magazine, vol. 15, iss. 1, pp. 73-79, 2014. [Bibtex]
    @article{musolff2014,
    author  = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid and Fischer, Georg},
    title  = {Linear and efficient Doherty PA Revisited},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2014},
    month  = {02},
    day  = {01},
    pages  = {73--79},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2013.2288713},
    publisher  = {IEEE},
    keywords  = {power amplifier,doherty,linear,3.5GHz,IMD,RFPA,PA,student design competition},
    volume  = {15},
    number  = {1},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1394},
    }
  • A. Koelpin, S. Mann, S. Lindner, S. Linz, F. Barbon, and R. Weigel, "Selbstteststrategien für Mikrowellen-Interferometrie zur hoch-genauen industriellen Abstandsmessung" in Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ), 2014. [Bibtex]
    @inproceedings{koelpin2014,
    author  = {Koelpin, Alexander and Mann, Sebastian and Lindner, Stefan and Linz, Sarah and Barbon, Francesco and Weigel, Robert},
    title  = {Selbstteststrategien für Mikrowellen-Interferometrie zur hoch-genauen industriellen Abstandsmessung},
    booktitle  = {{Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ)}},
    year  = {2014},
    month  = {02},
    location  = {Bad Staffelstein, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1423},
    }
  • A. Talai, G. Donati, R. Weigel, and A. Koelpin, "Test of alternative LTCC manufacturing processes for HF applications with realistic modeling of thick film technologies" in TuZ 2014 Testmethoden und Zuverlässigkeit von Schaltungen und Systemen, 2014. [Bibtex]
    @inproceedings{talai2014c,
    author  = {Talai, Armin and Donati, Giovanni and Weigel, Robert and Koelpin, Alexander},
    title  = {Test of alternative LTCC manufacturing processes for HF applications with realistic modeling of thick film technologies},
    booktitle  = {{TuZ 2014 Testmethoden und Zuverlässigkeit von Schaltungen und Systemen}},
    year  = {2014},
    month  = {02},
    day  = {24},
    location  = {Bad Staffelstein, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1259},
    }
  • [DOI] A. Schwarzmeier, J. Besser, R. Weigel, G. Fischer, and D. Kissinger, "A Compact Back-Plaster Sensor Node for Dementia and Alzheimer Patient Care" in 2014 IEEE Sensors Applications Symposium (SAS 2014), 2014, pp. 75-78. [Bibtex]
    @inproceedings{schwarzmeier2014,
    author  = {Schwarzmeier, Andre and Besser, J. and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Compact Back-Plaster Sensor Node for Dementia and Alzheimer Patient Care},
    booktitle  = {{2014 IEEE Sensors Applications Symposium (SAS 2014)}},
    year  = {2014},
    month  = {02},
    pages  = {75-78},
    doi  = {10.1109/SAS.2014.6798920},
    location  = {Queenstown, New Zealand},
    keywords  = {Index Terms--- remote health monitoring,medical information system,fall-detection,localization,sensor processing,data fusion},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1171},
    abstract  = {Abstract--- This paper presents a compact and highly integrated back-plaster sensor node equipped with seamless localization (in-door and out-door) using assisted GPS and bluetooth localization, activity classification and fall detection as well an GSM module providing a GPRS connection to a server infrastructure for supporting dementia and Alzheimer patients within their daily life. The innovative and durable design as a hermetic rubber-sealed, waterproof and sanitizable back-plaster ensures optimum wearing comfort for the patient as well as reliable fall-detection. In addition with an internet server infrastructure the described plaster sensor node allows to inform relatives or professional care staff in case of an emergency and help to enhance the quality of life by increasing the sense of feeling secure.},
    }
  • [DOI] A. Talai, F. Steinhäußer, A. Bittner, U. Schmid, R. Weigel, and A. Koelpin, "The Influence by Trapezoidal Conductor Shapes on Ring-Resonator based Material Characterization up to 110 GHz" in IEEE International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications, 2014, pp. 1-4. [Bibtex]
    @inproceedings{talai2014a,
    author  = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {The Influence by Trapezoidal Conductor Shapes on Ring-Resonator based Material Characterization up to 110 GHz},
    booktitle  = {{IEEE International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications}},
    year  = {2014},
    month  = {02},
    day  = {10},
    pages  = {1--4},
    doi  = {10.1109/NEMO.2014.6995723},
    location  = {Pavia, Italien},
    publisher  = {IEEE},
    keywords  = {CAD Modeling,Effective Permittivity,Field Simulation,material characterization,Microstrip Structure,Ring-Resonator,Trapezoidal Conductor},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1256},
    abstract  = {Material characterization by ring-resonator based measurements is well established since the early 20th century. Since then, the demand on spectral complex permittivity characterizations of RF materials and dielectric covers at higher microwave frequencies rises. Nowadays, both free space applications, e.g. 77 GHz automotive radar systems, and dielectrics for microchip packages require accurate knowledge of the relative permittivity in order to optimize RF circuit designs. With increasing frequencies, the conductor shape of photochemically etched ring-resonators gets more influence on the effective ring radius, and therefore the measured resonance frequencies, which results in an error for the relative permittivity determination. This paper provides correction factors for the ring radii up to 110GHz, compensating the altered field distribution due to trapezoidal edges.},
    }
  • [DOI] A. Talai, S. Mann, R. Weigel, and A. Koelpin, "Water Temperature Measurement by Microwave Six-Port Interferometry at 24 GHz" in IEEE Radio Wireless Week 2014, 2014, pp. 10-12. [Bibtex]
    @inproceedings{talai2014,
    author  = {Talai, Armin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Water Temperature Measurement by Microwave Six-Port Interferometry at 24 GHz},
    booktitle  = {{IEEE Radio Wireless Week 2014}},
    year  = {2014},
    month  = {01},
    pages  = {10--12},
    doi  = {10.1109/WiSNet.2014.6825498},
    location  = {New Port Beach, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1129},
    abstract  = {Microwave interferometry enables the possibility of highly accurate distance measurements by evaluating phase differences. The reflected power is a function of the effective radar cross-section, the measurement distance, and the attenuation in air. An irradiated plain water surface shows a temperaturedependent behavior by means of the reflected power. This is due to the fact that the complex permittivity of water, as well as the refractive index, strongly depends on the water temperature within the 24 GHz Industrial, Scientific and Medical (ISM) band. Consequently, the effective radar cross-section depends on the temperature as well. This paper describes a method of monitoring the water temperature as a side effect of an interferometric radar in Six-Port technology for water level measurements.},
    }
  • [DOI] A. Schwarzmeier, R. Weigel, G. Fischer, and D. Kissinger, "A Low-Power Fall Detection and Activity Monitoring System for Nursing Facilities and Hospitals" in IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014), 2014, pp. 28-30. [Bibtex]
    @inproceedings{schwarzmeier2013,
    author  = {Schwarzmeier, Andre and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Low-Power Fall Detection and Activity Monitoring System for Nursing Facilities and Hospitals},
    booktitle  = {{IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014)}},
    year  = {2014},
    month  = {01},
    pages  = {28--30},
    doi  = {10.1109/BioWireleSS.2014.6827736},
    location  = {Newport Beach, CA, USA},
    keywords  = {Index Terms--- semi active UHF RFID,remote fall monitoring,sensor tag,localization,Ambient Assisted Living (AAL),sensor processing},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1104},
    abstract  = {Abstract--- This paper presents a fall detection and activity monitoring system comprised of a server software for data management, multiple UHF RFID readers and an energy efficient, small and lightweight semi-passive UHF RFID sensor tag. The system is able to gather activity and indoor localization data of several persons wearing just one sensor tag, making it particularly suitable for the use in nursing facilities or hospitals. The implemented fall detection alerts nursing staff in case of a detected fall and allows quick intervention in case of an emergency.},
    }
  • [DOI] S. Glock, J. Rascher, B. Sogl, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "A Semi-Physical Power Amplifier Behavioral Model Capable of Predicting Gain Expansion Effects" in IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications, 2014, pp. 1-3. [Bibtex]
    @inproceedings{glock2014,
    author  = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {A Semi-Physical Power Amplifier Behavioral Model Capable of Predicting Gain Expansion Effects},
    booktitle  = {{IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications}},
    year  = {2014},
    month  = {01},
    day  = {20},
    pages  = {1--3},
    doi  = {10.1109/PAWR.2014.6825726},
    location  = {Newport Beach, CA, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1175},
    abstract  = {A novel semi-physical power amplifier (PA) behavioral model (BM) that describes the input-output characteristic of PAs exhibiting gain expansion (GE) is introduced. The accurate prediction of GE is of particular importance because GE typically improves the power added efficiency (PAE) at high input powers. Though, GE impacts the spectral regrowth. Therefore, BMs that are capable of predicting GE, like the one introduced in this work, are highly desirable. In a case study, the proposed model is employed to predict the AM-AM distortions of a GaAs PA designed for LTE applications. Excellent agreement between measurement and simulation results is obtained. The computational efficient model allows system-level simulations of advanced transmitter systems in order to optimize their modes of operation.},
    }
  • [DOI] T. Nowak, M. Hierold, M. Hartmann, and H. Tröger, "System and Signal Design for an Energy-efficient Multi-frequency Localization System" in IEEE Topical Meeting on Wireless Sensors and Sensor Networks, 2014, pp. 55-57. [Bibtex]
    @inproceedings{nowak2014,
    author  = {Nowak, Thorsten and Hierold, Martin and Hartmann, Markus and Tröger, Hans-Martin},
    title  = {System and Signal Design for an Energy-efficient Multi-frequency Localization System},
    booktitle  = {{IEEE Topical Meeting on Wireless Sensors and Sensor Networks}},
    year  = {2014},
    month  = {01},
    pages  = {55--57},
    doi  = {10.1109/WiSNet.2014.6825497},
    keywords  = {Wireless sensor network,localization,multifrequency,phase-based ranging},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1172},
    abstract  = {In this paper we propose a concept for an efficient multi-frequency localization system. The system design aims at extremly light-weight, and thus energy-efficient tags. The localization system is realized by a Wireless Sensor Network comprising signal strength and phase measurements. We propose signals for phase-based ranging. The proposed signals have to meet several constraints: low-power signal generation, efficient signal processing, and most important precise range estimation. The performance of the range estimation is assessed utilizing the Cramer-Rao Lower Bound.},
    }
  • [DOI] S. Schröter, S. Rieß, R. Weigel, and G. Fischer, "Enhancing Open Loop Beamsteering Performance for the Uplink of UMTS/HSPA+ under Discontinuous Transmission" in IEEE Radio and Wireless Symposium (RWS), 2014, pp. 244-246. [Bibtex]
    @inproceedings{schroeter2014,
    author  = {Schröter, Simon and Rieß, Steffen and Weigel, Robert and Fischer, Georg},
    title  = {Enhancing Open Loop Beamsteering Performance for the Uplink of UMTS/HSPA+ under Discontinuous Transmission},
    booktitle  = {{IEEE Radio and Wireless Symposium (RWS)}},
    year  = {2014},
    month  = {01},
    pages  = {244--246},
    doi  = {10.1109/RWS.2014.6830142},
    location  = {Newport Beach, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1108},
    }
  • [DOI] A. Thomas, W. Bakalski, T. Ußmüller, and R. Weigel, "A MIM-cap free digitally tunable NMOS pi-network" in IEEE Radio and Wireless Symposium (RWW), 2014, pp. 1-4. [Bibtex]
    @inproceedings{thomas2014,
    author  = {Thomas, Anthony and Bakalski, Winfried and Ußmüller, Thomas and Weigel, Robert},
    title  = {A MIM-cap free digitally tunable NMOS pi-network},
    booktitle  = {{IEEE Radio and Wireless Symposium (RWW)}},
    year  = {2014},
    pages  = {1--4},
    doi  = {10.1109/IMaRC.2013.6777725},
    location  = {Newport Beach, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1123},
    }
  • [DOI] S. Zeller, C. Muenker, R. Weigel, and T. Ußmüller, "A 0.039 mm2 Inverter-Based 1.82 mW 68.6 dB-SNDR 10 MHz-BW CT-Sigma Delta-ADC in 65 nm CMOS Using Power- and Area-Efficient Design Techniques", IEEE Journal of Solid-State Circuits, vol. 49, iss. 7, pp. 1548-1560, 2014. [Bibtex]
    @article{zeller2014,
    author  = {Zeller, Sebastian and Muenker, Christian and Weigel, Robert and Ußmüller, Thomas},
    title  = {A 0.039 mm2 Inverter-Based 1.82 mW 68.6 dB-SNDR 10 MHz-BW CT-Sigma Delta-ADC in 65 nm CMOS Using Power- and Area-Efficient Design Techniques},
    journal  = {{IEEE Journal of Solid-State Circuits}},
    year  = {2014},
    pages  = {1548--1560},
    doi  = {10.1109/JSSC.2014.2321063},
    volume  = {49},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1856},
    }
  • C. Zeller, C. Muenker, and R. Weigel, "Ein Inverter-basierter zeitkontinuierlicher Sigma-Delta-ADC mit 20MS/s und 11Bit ENOB in 65nm CMOS" in Workshop Analogschaltungen, 2014, pp. 1-4. [Bibtex]
    @inproceedings{zeller2014a,
    author  = {Zeller, Christian and Muenker, Christian and Weigel, Robert},
    title  = {Ein Inverter-basierter zeitkontinuierlicher Sigma-Delta-ADC mit 20MS/s und 11Bit ENOB in 65nm CMOS},
    booktitle  = {{Workshop Analogschaltungen}},
    year  = {2014},
    pages  = {1--4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1859},
    }
  • [DOI] S. Mann, S. Lindner, F. Lurz, F. Barbon, S. Linz, R. Weigel, and A. Koelpin, "A Microwave Interferometer Based Contactless Quasi-TEM Waveguide Position Encoder with Micrometer Accuracy" in IEEE International Microwave Symposium (IMS2014), 2014, pp. 1-4. [Bibtex]
    @inproceedings{mann2014a,
    author  = {Mann, Sebastian and Lindner, Stefan and Lurz, Fabian and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {A Microwave Interferometer Based Contactless Quasi-TEM Waveguide Position Encoder with Micrometer Accuracy},
    booktitle  = {{IEEE International Microwave Symposium (IMS2014)}},
    year  = {2014},
    pages  = {1--4},
    doi  = {10.1109/MWSYM.2014.6848655},
    location  = {Tampa, Florida, USA},
    publisher  = {IEEE Microwave Theory and Techniques Society},
    keywords  = {Six-Port,position encoder,parallel plate waveguide,phase measurement},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1387},
    abstract  = {Position measurement plays an important role in industrial process technology. Hereby, a waveguide based position sensor system for industrial applications is described. The proposed system features a Phase Locked Loop controlled 24 GHz signal source, an interferometric Six-Port receiver structure, a radar coupler, and a terminated quasi-TEM parallel plate waveguide structure. Furthermore, the system concept comprises a target, which can be applied both touching and contactless in the waveguide’s fringing field, reflecting a part of the transmitted wave. To obtain the target’s position information, the reflected wave is compared to a reference signal with respect to the relative phase difference. Hence, this phase shift is directly related to the position information.},
    }
  • [DOI] A. Farabegoli, B. Sogl, J. Müller, and R. Weigel, "A Novel Crest Factor Reduction Technique using Memoryless Polynomials" in European Microwave Conference, 2014, pp. 825-828. [Bibtex]
    @inproceedings{farabegoli2014,
    author  = {Farabegoli, Alessio and Sogl, Bernhard and Müller, Jan-Erik and Weigel, Robert},
    title  = {A Novel Crest Factor Reduction Technique using Memoryless Polynomials},
    booktitle  = {{European Microwave Conference}},
    year  = {2014},
    pages  = {825--828},
    doi  = {10.1109/EuMC.2014.6986562},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1905},
    }
  • [DOI] A. Gharib, A. Talai, R. Weigel, and D. Kissinger, "80 Gb/s 2_11-1 PBRS Generator Employing Parallel Architecture in SiGe Bipolar Technology" in IEEE Radio Frequency Integrated Circuits Symposium, 2014, pp. 1-4. [Bibtex]
    @inproceedings{gharib2014b,
    author  = {Gharib, Ahmed and Talai, Armin and Weigel, Robert and Kissinger, Dietmar},
    title  = {80 Gb/s 2_11-1 PBRS Generator Employing Parallel Architecture in SiGe Bipolar Technology},
    booktitle  = {{IEEE Radio Frequency Integrated Circuits Symposium}},
    year  = {2014},
    pages  = {1--4},
    doi  = {10.1109/EuMIC.2014.6997846},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1890},
    }
  • [DOI] A. Elmaghraby, G. Fischer, R. Weigel, and T. Ußmüller, "An inductor-less LTE receiver using an 8-path filter for TX leakage suppression" in IEEE Silicon Monolithic Integrated Circuits in RF Systems, 2014, pp. 38-40. [Bibtex]
    @inproceedings{elmaghraby2014,
    author  = {Elmaghraby, Ahmed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {An inductor-less LTE receiver using an 8-path filter for TX leakage suppression},
    booktitle  = {{IEEE Silicon Monolithic Integrated Circuits in RF Systems}},
    year  = {2014},
    pages  = {38--40},
    doi  = {10.1109/SiRF.2014.6828503},
    location  = {Newport Beach, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1141},
    }
  • [DOI] A. Chakraborty, S. Trotta, K. Aufinger, R. Lachner, and R. Weigel, "A low-power, low-noise, highly-linear receiver for 122 GHz applications in a SiGe BiCMOS technology" in IEEE Radio and Wireless Symposium (RWW), 2014, pp. 50-52. [Bibtex]
    @inproceedings{chakraborty2014,
    author  = {Chakraborty, Abhiram and Trotta, Saverio and Aufinger, Klaus and Lachner, Rudolf and Weigel, Robert},
    title  = {A low-power, low-noise, highly-linear receiver for 122 GHz applications in a SiGe BiCMOS technology},
    booktitle  = {{IEEE Radio and Wireless Symposium (RWW)}},
    year  = {2014},
    pages  = {50--52},
    doi  = {10.1109/SiRF.2014.6828534},
    location  = {Newport Beach, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1120},
    }
  • C. Blümm, C. Heller, and R. Weigel, "Wireless Aircraft Cabin Communication - An ISM Band Cognitive Radio Approach" in 8th Karlsruhe Workshop on Software radios, 2014, pp. 1-4. [Bibtex]
    @inproceedings{bluemm2014,
    author  = {Blümm, Christian and Heller, Christoph and Weigel, Robert},
    title  = {Wireless Aircraft Cabin Communication - An ISM Band Cognitive Radio Approach},
    booktitle  = {{8th Karlsruhe Workshop on Software radios}},
    year  = {2014},
    pages  = {1--4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1855},
    }
  • [DOI] T. Buckel, C. Wicpalek, T. Mayer, S. Tertinek, P. Preyler, B. Neurauter, R. Weigel, and T. Ußmüller, "Challenges in RF-DPLL Design for Wideband Phase Modulation supporting SC-FDMA in LTE Uplink" in European Microwave Conference, 2014, pp. 604-607. [Bibtex]
    @inproceedings{buckel2014,
    author  = {Buckel, Tobias and Wicpalek, Christian and Mayer, Thomas and Tertinek, Stefan and Preyler, Peter and Neurauter, Burkhard and Weigel, Robert and Ußmüller, Thomas},
    title  = {Challenges in RF-DPLL Design for Wideband Phase Modulation supporting SC-FDMA in LTE Uplink},
    booktitle  = {{European Microwave Conference}},
    year  = {2014},
    pages  = {604--607},
    doi  = {10.1109/EuMC.2014.6986506},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1906},
    }
  • [DOI] A. Hartmann, R. Strzoda, and R. Weigel, "CO2 sensor for mainstream capnography based on TDLAS", Applied Physics B: Lasers and Optics, pp. 1023-1026, 2014. [Bibtex]
    @article{hartmann2014,
    author  = {Hartmann, Alexander and Strzoda, Rainer and Weigel, Robert},
    title  = {CO2 sensor for mainstream capnography based on TDLAS},
    journal  = {{Applied Physics B: Lasers and Optics}},
    year  = {2014},
    pages  = {1023--1026},
    issn  = {1432-0649},
    doi  = {10.1007/s00340-014-5791-4},
    publisher  = {Springer-Verlag},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1122},
    }
  • [DOI] S. Lutz, T. Walter, and R. Weigel, "Lens-based 77 GHz MIMO Radar for Angular Estimation in Multitarget Environments", International Journal of Microwave and Wireless Technologies, vol. 6, iss. 3/4, pp. 397-404, 2014. [Bibtex]
    @article{lutz2014,
    author  = {Lutz, Steffen and Walter, Thomas and Weigel, Robert},
    title  = {Lens-based 77 GHz MIMO Radar for Angular Estimation in Multitarget Environments},
    journal  = {{International Journal of Microwave and Wireless Technologies}},
    year  = {2014},
    pages  = {397--404},
    isbn  = {978-2-87487-033-0},
    doi  = {10.1017/S1759078714000506},
    volume  = {6},
    number  = {3/4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1867},
    }
  • J. Nehring, G. Fischer, R. Weigel, and D. Kissinger, "An 8-32GHz Frequency Synthesizer based on a Wideband VCO Array with Bandwidth Extension Stage" in German Microwave Conference 2014 (Gemic), 2014, pp. 1111-2222. [Bibtex]
    @inproceedings{nehring2014a,
    author  = {Nehring, Johannes and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {An 8-32GHz Frequency Synthesizer based on a Wideband VCO Array with Bandwidth Extension Stage},
    booktitle  = {{German Microwave Conference 2014 (Gemic)}},
    year  = {2014},
    pages  = {1111--2222},
    location  = {Aachen, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1173},
    abstract  = {This paper proposes a wideband signal source covering a bandwidth of two octaves from 8 GHz to 32 GHz. The system is based on an array of three wideband voltage controlled oscillators (VCOs) for octave wide frequency syn- thesis and a post-synthesis stage which extends the bandwidth by another octave. The circuits were fabricated in a 0.35 μm SiGe bipolar technology with an ft/fmax= 170/250GHz. The VCO tuning ranges are 28.9 \%, 26.2 \% and 24.7 \% respectively. The average output power was measured to be −3.5 dBm. The single-sideband phase noise at 1 MHz offset has an average value of −100 dBc/Hz over the entire bandwidth of two octaves. The system blocks VCO array, bandwidth extension and output buffer consume a power of 175 mW, 277 mW and 150 mW.},
    }
  • F. Oesterle, R. Weigel, and A. Koelpin, "Ein paralleles Verfahren zum Volumentest von kapazitiven MEMS Sensoren" in 26. ITG/GI/GMM-Workshop: Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ), 2014. [Bibtex]
    @inproceedings{oesterle2014,
    author  = {Oesterle, Florian and Weigel, Robert and Koelpin, Alexander},
    title  = {Ein paralleles Verfahren zum Volumentest von kapazitiven MEMS Sensoren},
    booktitle  = {{26. ITG/GI/GMM-Workshop: Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ)}},
    year  = {2014},
    location  = {Banz, Germany},
    keywords  = {MEMS,Parallel Testing,Mechanical Sensitivity,Pull-In,Microphone,Tomographic Reconstruction},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1234},
    }
  • [DOI] J. Nehring, I. Nasr, K. Borutta, R. Weigel, and D. Kissinger, "A Silicon Integrated Microwave Vector Network Analyzer for Biomedical Sensor Read-Out Applications" in IEEE International Microwave Symposium, 2014. [Bibtex]
    @inproceedings{nehring2014,
    author  = {Nehring, Johannes and Nasr, Ismail and Borutta, Karl and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Silicon Integrated Microwave Vector Network Analyzer for Biomedical Sensor Read-Out Applications},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2014},
    doi  = {10.1109/MWSYM.2014.6848254},
    location  = {Tampa Bay, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1294},
    abstract  = {This paper proposes an integrated reflectometer for biomedical sensor read-out applications using a low-cost silicon- germanium technology. The heterodyne reflectometer consists of two integrated cross-coupled oscillators, a set of two directional couplers as well as Gilbert-Cell downconversion mixers. A dual phase-locked-loop architecture guarantees the phase lock of both on-chip signal sources to an external reference oscillator. An OSM-calibration was applied to the reflectometer and measure- ments of the complex reflection coefficient of an arbitrary device under test (DUT) showed excellent agreement with the results of a commercial vector network analyzer. As a proof of concept for sensor read-out, five solutions with different mixture ratios were characterized with a dielectric probe connected to the reflectometer.},
    }
  • [DOI] F. Barbon, S. Lindner, S. Mann, S. Linz, R. Weigel, and A. Koelpin, "Fast In-Situ Diode Detector Characterization for Six-Port Interferometer Receivers" in 2014 IEEE Radio and Wireless Week (RWW 2014), 2014. [Bibtex]
    @inproceedings{barbon2014,
    author  = {Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {Fast In-Situ Diode Detector Characterization for Six-Port Interferometer Receivers},
    booktitle  = {{2014 IEEE Radio and Wireless Week (RWW 2014)}},
    year  = {2014},
    doi  = {10.1109/WiSNet.2014.6825501},
    keywords  = {six-port,diode detector,power measurement,characterization,in-situ},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1162},
    abstract  = {Six-Port receivers require a precise power measurement of all their four output channels. However, due to temperature drift, fabrication and component tolerances the detectors' performance may have some degradation, which limits the measurement accuracy. Thus, an in-situ detector characterization is necessary. In this paper, a fast and simple solution for estimating the diode detectors' characteristics is presented, which is ideal for Six-Port diode power detectors. This method is fast and can be easily implemented on a microcontroller.},
    }
  • [DOI] S. Lutz, T. Walter, and R. Weigel, "Target Simulator for Chirp Modulated 77 GHz Automotive Radar Sensors" in European Radar Conference, 2014, pp. 65-68. [Bibtex]
    @inproceedings{lutz2014a,
    author  = {Lutz, Steffen and Walter, Thomas and Weigel, Robert},
    title  = {Target Simulator for Chirp Modulated 77 GHz Automotive Radar Sensors},
    booktitle  = {{European Radar Conference}},
    year  = {2014},
    pages  = {65--68},
    doi  = {10.1109/EuRAD.2014.6991208},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1904},
    }
  • [DOI] S. Mann, S. Lindner, S. Linz, F. Barbon, A. Talai, R. Weigel, and A. Koelpin, "A Tank Level Sensor Based on Six-Port Technique Comprising a quasi-TEM Waveguide" in IEEE Radio and Wireless Week 2014, 2014, pp. 4-6. [Bibtex]
    @inproceedings{mann2014,
    author  = {Mann, Sebastian and Lindner, Stefan and Linz, Sarah and Barbon, Francesco and Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    title  = {A Tank Level Sensor Based on Six-Port Technique Comprising a quasi-TEM Waveguide},
    booktitle  = {{IEEE Radio and Wireless Week 2014}},
    year  = {2014},
    pages  = {4--6},
    doi  = {10.1109/WiSNet.2014.6825512},
    location  = {Newport Beach, CA, USA},
    publisher  = {IEEE},
    keywords  = {Six-Port,Interferometer,tank,level monitoring,parallel plate waveguide,,RADAR,microwave measurement},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1126},
    abstract  = {Robust tank level monitoring is an important issue in chemical and process industry and a challenging task if high accuracy has to be reached. The proposed sensor structure consists of a quasi-TEM mode waveguide on the one hand and an interferometric Six-Port receiver structure on the other hand. The waveguide structure itself in combination with the liquid to be monitored acts as a reflection phase shifter. By superposing the reflected and the transmitted electromagnetic wave within a passive structure, the relative phase between both signals can be accurately obtained by means of the Six-Port principle. Thus, a change of the liquid level is directly related to the relative phase shift monitored by the Six-Port interferometer. In contrast to antenna based tank level sensors, the hereby presented system concept makes use of a novel waveguide structure. therefore, it is not sensitive to multi-target scenarios and multipath propagation.},
    }
  • S. Rieß, J. Brendel, A. Stöckle, S. Schröter, R. Rose, and G. Fischer, "The Spectrum Sensing Network: Information Acquisition for the Cognitive PMSE System," in tbd., Shaker Verlag, 2014. [Bibtex]
    @inbook{riess2014,
    author  = {Rieß, Steffen and Brendel, Johannes and Stöckle, Andreas and Schröter, Simon and Rose, Richard and Fischer, Georg},
    title  = {The Spectrum Sensing Network: Information Acquisition for the Cognitive PMSE System},
    booktitle  = {{tbd.}},
    year  = {2014},
    publisher  = {Shaker Verlag},
    keywords  = {PMSE,cognitive radio,spectrum sensing,sensing network,sensing grid,scanning controller,scanning receiver,scanning antenna,radio environment map,data fusion},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1333},
    abstract  = {Accessing the frequency spectrum in a dynamic way has been discussed since several years. The Cognitive Radio (CR) technology was identi ed as enabler in order to use the spectral resources in a more e cient way. However, to guarantee interference free operation between multiple services, spectrum sensing plays a major role of designing such a system. This contribution focuses on the realization of the Spectrum Sensing Network (SSN) that has been developed during a research project in Germany. The SSN involves multiple sensor nodes consisting of a receiver with broadband antenna which are connected to a central controller that is in charge of handling the interfaces and acquired data of the SSN. With this setup it is possible to generate an accurate radio environment map, i.e. power over frequency, time and location, in the UHF frequency range from 470 to 870 MHz. After a short introduction to the system requirements and a project overview, attention is paid to the necessary components of such a distributed sensing grid. The measurement results and the discussion of possible advantages of a SSN show the added value for a CR system. Although, the application and demonstration was based on the improvement of operating conditions for Professional Wireless Microphone Systems (PWMS), the originated eld trial platform is open for reasearch activities related to other CR systems in this frequency range.},
    }

2013

  • [DOI] I. Nasr, B. Lämmle, K. Aufinger, G. Fischer, R. Weigel, and D. Kissinger, "A 70 to 90 GHz High-Linearity Multi-Band Quadrature Receiver in 0.35 μm SiGe Technology", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 12, pp. 4600-4612, 2013. [Bibtex]
    @article{nasr2013b,
    author  = {Nasr, Ismail and Lämmle, Benjamin and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 70 to 90 GHz High-Linearity Multi-Band Quadrature Receiver in 0.35 μm SiGe Technology},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2013},
    month  = {12},
    pages  = {4600--4612},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2013.2285280},
    publisher  = {IEEE},
    volume  = {61},
    number  = {12},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1169},
    abstract  = {An integrated frequency agile quadrature E-band receiver is presented in this paper. The complete receiver is realized in a commercial 0.35μm SiGe:C technology with an ft=fmax of 170/250GHz. The receiver covers the two point to point communication bands from 71 to 76 GHz and 81 to 86 GHz and the automotive radar band at 77 GHz. A wide tuning range modified Colpitts oscillator provides an LO tuning range > 30\%. A two stage constant phase RC polyphase network is implemented to provide wide-band quadrature (IQ) LO signals. The measured phase imbalance of the network stays below 8 over the receiver’s frequency range. In addition the chip includes a wide-band LNA, Wilkinson power divider, down conversion mixers and frequency prescaler. Each of the chip’s receiver I/Q paths shows a measured conversion gain above 19 dB and an input referred 1 dB compression point of -22 dBm. The receiver’s measured noise figure stays below 11 dB over the complete frequency range. Furthermore, the receiver has a measured IF bandwidth of 6 GHz. The complete chip including prescaler draws a current of 230mA from a 3.3V supply, and consumes a chip area of 1628μm x 1528 μm.},
    }
  • [DOI] J. Brendel, A. Schmidt, and G. Fischer, "A Link Quality Indicator for analog FM Transmission Systems" in IEEE Conference on Signal Processing and Communication Systems, 2013. [Bibtex]
    @inproceedings{brendel2013b,
    author  = {Brendel, Johannes and Schmidt, Axel and Fischer, Georg},
    title  = {A Link Quality Indicator for analog FM Transmission Systems},
    booktitle  = {{IEEE Conference on Signal Processing and Communication Systems}},
    year  = {2013},
    month  = {12},
    doi  = {10.1109/ICSPCS.2013.6723964},
    location  = {Gold Coast, Australia},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1072},
    abstract  = {This work describes a method to determine the link quality of analog frequency modulated (FM) transmission systems (especially wireless microphones) with the help of digital signal processing. We exploit the amplitude variations of a disturbed FM transmission to estimate the signal to interference plus noise ratio (SINR) of the received signal. Furthermore, the statistical measure kurtosis is used to determine the type of interference. After the theoretic description and derivation of the algorithms, the approach is confirmed with simulations. Finally, measurements and results of a hardware implementation show the applicability of the presented link quality estimator for instance in cognitive wireless microphone systems.},
    }
  • [DOI] S. Linz, G. Vinci, S. Mann, S. Lindner, F. Barbon, R. Weigel, and A. Koelpin, "A Compact, Versatile Six-Port Radar Module for Industrial and Medical Applications", Journal of Electrical and Computer Engineering, vol. 2013, pp. 1-10, 2013. [Bibtex]
    @article{linz2013b,
    author  = {Linz, Sarah and Vinci, Gabor and Mann, Sebastian and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A Compact, Versatile Six-Port Radar Module for Industrial and Medical Applications},
    journal  = {{Journal of Electrical and Computer Engineering}},
    year  = {2013},
    month  = {12},
    pages  = {1--10},
    issn  = {2090-0146},
    doi  = {10.1155/2013/382913},
    publisher  = {Hindawi Publishing Corporation},
    volume  = {2013},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1229},
    abstract  = {The Six-port receiver has been intensively investigated in the last decade to be implemented as an alternative radar architecture. Plenty of current scientific publications demonstrate the effectiveness and versatility of the Six-port radar for special industrial, automotive and medical applications, ranging from accurate contactless vibration analysis, through automotive radar calibration to remote breath and heartbeat monitoring. Its highlights, such as excellent phase discrimination, trivial signal processing, low circuit complexity and cost have lately drawn the attention of companies working with radar technology. A joint project involving the University of Erlangen-Nuremberg and InnoSenT GmbH (Innovative Sensor Technology), led to the development of a highly accurate, compact and versatile Six-port radar module aiming at a reliable high-integration of all subcomponents such as antenna, Six-port front-end, baseband circuitry and digital signal processing in one single package. Innovative aspects in the RF front-end design as well as in the integration strategy are hereby presented, together with a system overview and measurement results.},
    }
  • [DOI] S. Glock, J. Rascher, B. Sogl, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "A Novel Power Amplifier Behavioral Model for Improving the Linearity-Efficiency Tradeoff" in International Microwave and RF Conference (IMaRC), 2013, pp. 1-4. [Bibtex]
    @inproceedings{glock2013c,
    author  = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {A Novel Power Amplifier Behavioral Model for Improving the Linearity-Efficiency Tradeoff},
    booktitle  = {{International Microwave and RF Conference (IMaRC)}},
    year  = {2013},
    month  = {12},
    day  = {14},
    pages  = {1--4},
    doi  = {10.1109/IMaRC.2013.6777718},
    location  = {New Delhi, India},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1176},
    abstract  = {This paper focuses on a novel power amplifier (PA) semi-physical behavioral model (BM) to study the linearityefficiency trade-off in modern wireless transmitter systems. While the behavioral models known in the literature mainly focus on the precise description of the PA nonlinearity in terms of amplitudemodulation- to-amplitude-modulation (AM-AM) and amplitudemodulation- to-phase-modulation (AM-PM) distortions, the model introduced here, also predicts the DC current flowing from the power supply to the PA. This allows to optimize the battery current while keeping the out-of-channel interference within specification limits. In a case study, the DC current and the amplitude distortions of a PA, designed for IEEE 802.11b/g/n applications are predicted with a normalized mean square error (NMSE) of -39.92 dB and -47.07 dB, respectively.},
    }
  • N. Franchi, G. Fischer, and R. Weigel, "Adaptive Automobilfunksysteme" in Embedded Software Engineering Kongress 2013, 2013, pp. 56-62. [Bibtex]
    @inproceedings{franchi2013c,
    author  = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    title  = {Adaptive Automobilfunksysteme},
    booktitle  = {{Embedded Software Engineering Kongress 2013}},
    year  = {2013},
    month  = {12},
    day  = {04},
    pages  = {56--62},
    location  = {Sindelfingen, Germany},
    publisher  = {Vogel Business Media},
    keywords  = {Software Defined Radio,Wireless Vehicular Communication Systems,Car-to-X,IEEE 802.11p},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1136},
    abstract  = {Traditionell werden in der Automobilbranche bis dato Systeme mit ausschließlich dedizierten, integrierten Chiplösungen, die jeweils nur auf einen Kommunikationsstandard spezialisiert sind, entwickelt. Im Gegensatz dazu wird in diesem Beitrag ein wegweisendes Integrations- und Prototypingkonzept, aufbauend auf dem Software-Defined-Radio-Prinzip, vorgestellt bei dem eine frei programmierbare Kommunikationsplattform eine Vielzahl unterschiedlicher Funkstandards auf ein und derselben Hardware abbilden kann. Ob diese Funkplattform nun verkehrstelematische Dienste (z.B. eCall-Notruffunktion, Car-2-X-Kommunikation) oder bspw. eine Mobilfunkanbindung (UMTS, LTE) ermöglicht, wird allein durch die Konfiguration der eingebetteten Software und digitalen Schaltkreise festgelegt. Am Beispiel der WLAN-Funkstandards IEEE 802.11b/p sollen anhand eines Demonstrators sowohl die Stärken des Prototypingkonzepts als auch des universellen Funkplattformansatzes für Funksysteme im Fahrzeug verdeutlicht werden.},
    }
  • [DOI] C. Blümm, C. Heller, B. Fourestie, and R. Weigel, "Air-to-ground channel characterization for OFDM communication in C-Band" in 7th International Conference on Signal Processing and Communication Systems (ICSPCS), 2013, pp. 1-8. [Bibtex]
    @inproceedings{bluemm2013b,
    author  = {Blümm, Christian and Heller, Christoph and Fourestie, B. and Weigel, Robert},
    title  = {Air-to-ground channel characterization for OFDM communication in C-Band},
    booktitle  = {{7th International Conference on Signal Processing and Communication Systems (ICSPCS)}},
    year  = {2013},
    month  = {12},
    pages  = {1--8},
    doi  = {10.1109/ICSPCS.2013.6723935},
    location  = {Carraraa, VIC},
    keywords  = {OFDM modulation,optimisation,radio networks,space telemetry,wireless channels,C-Band,OFDM communication,air-to-ground channel characterization,air-to-ground telemetry,channel sounding technique},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1312},
    abstract  = {Knowledge of the propagation channel is essential for the design and optimization of wireless communication systems. This paper presents the case study of an ongoing data link development for air-to-ground telemetry in C-band, based on Orthogonal Frequency Division Multiplexing (OFDM). A novel easy-to-use channel sounding technique is applied to identify specific small-scale channel fading effects. With the obtained information, the OFDM system can be parameterized in terms of subcarrier spacing and cyclic prefix. This helps to maximize data throughput and robustness even for worst-case aircraft positions and maneuvers.},
    }
  • T. Ußmüller, "Remote Powered Medical Implants" in MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, 2013. [Bibtex]
    @inproceedings{ussmueller2013b,
    author  = {Ußmüller, Thomas},
    title  = {Remote Powered Medical Implants},
    booktitle  = {{MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications}},
    year  = {2013},
    month  = {12},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1273},
    }
  • F. Barbon, S. Lindner, S. Mann, S. Linz, R. Weigel, and A. Koelpin, "Characterization In-Situ of Diode Detectors for Six-Port receivers" in Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ), 2013. [Bibtex]
    @inproceedings{barbon2013,
    author  = {Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {Characterization In-Situ of Diode Detectors for Six-Port receivers},
    booktitle  = {{Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ)}},
    year  = {2013},
    month  = {12},
    location  = {Bad Staffelstein},
    publisher  = {GMM VDE/VDI-Gesellschaft Mikroelektronik, Mikrosystem- und Feinwerktechnik},
    keywords  = {six-port,diode detector,power measurement,in-situ},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1226},
    abstract  = {Six-Port receivers require a precise power mea- surement thus a characterization in-situ of its power detector is necessary. The industrial working ambient requires a constant performance monitoring due to temperature drift, fabrication and component tolerances. The detectors’ performance may have some degradation, which limits the measurement accuracy. Thus, an in-situ detector characterization is necessary. In this paper, a fast and simple solution for estimating the diode detectors’ char- acteristics is presented, which is ideal for Six-Port diode power detectors. This method is fast and can be easily implemented on a microcontroller.},
    }
  • [DOI] S. Rieß, J. Brendel, and G. Fischer, "Model-Based Implementation for the Calculation of Power Spectral Density in an FPGA System" in IEEE International Conference on Signal Processing and Communication Systems (ICSPCS), 2013. [Bibtex]
    @inproceedings{riess2013c,
    author  = {Rieß, Steffen and Brendel, Johannes and Fischer, Georg},
    title  = {Model-Based Implementation for the Calculation of Power Spectral Density in an FPGA System},
    booktitle  = {{IEEE International Conference on Signal Processing and Communication Systems (ICSPCS)}},
    year  = {2013},
    month  = {12},
    doi  = {10.1109/ICSPCS.2013.6723929},
    location  = {Gold Coast, Australia},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1067},
    abstract  = {Cognitive Radio (CR) systems equipped with a spectrum sensing unit are able to access the radio frequency spectrum in a dynamic manner. This paper presents a model-based design approach and implementation for the calculation of the Power Spectral Density (PSD) of the received signal in a spectrum scanner. Design parameters based on the requirements of the complete CR system as well as the signal processing steps for the PSD calculation are described. The signal processing comprises the implementation of a control unit, selectable window functions, the Fast Fourier Transformation, the calculation of the magnitude, selectable number of averages for the calculation of peak and mean power values as well as the logarithmic representation of the spectrum. The presented processing block is integrated as part of an embedded system in an FPGA. The simulation and measurement results demonstrate and proof the functionality of the developed block with the shown design flow.},
    }
  • D. Kissinger, "Biowireless 2014 (feature column)", IEEE Microwave Magazine, vol. 14, iss. 7, pp. 156-156, 2013. [Bibtex]
    @article{kissinger2013a,
    author  = {Kissinger, Dietmar},
    title  = {Biowireless 2014 (feature column)},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2013},
    month  = {11},
    pages  = {156--156},
    issn  = {1527-3342},
    publisher  = {IEEE},
    volume  = {14},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1418},
    }
  • [DOI] F. Steinhäußer, A. Talai, A. Steiger-Thirsfeld, A. Koelpin, R. Weigel, A. Bittner, and U. Schmid, "Graphical based characterisation and modelling of material gradients in porosified LTCC", Journal of the European Ceramic Society, vol. 34, iss. 11, pp. 2833-2838, 2013. [Bibtex]
    @article{steinhaeusser2013a,
    author  = {Steinhäußer, Frank and Talai, Armin and Steiger-Thirsfeld, A. and Koelpin, Alexander and Weigel, Robert and Bittner, Achim and Schmid, Ulrich},
    title  = {Graphical based characterisation and modelling of material gradients in porosified {LTCC}},
    journal  = {{Journal of the European Ceramic Society}},
    year  = {2013},
    month  = {11},
    pages  = {2833-2838},
    issn  = {0955-2219},
    doi  = {10.1016/j.jeurceramsoc.2014.01.021},
    location  = {China},
    publisher  = {Elsevier},
    keywords  = {porosity,dielectric properties,glass ceramics,graphical method,wet etching},
    volume  = {34},
    number  = {11},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1180},
    abstract  = {The chemical composition of LTCC (low temperature cofired ceramics) allows the local implementation of air into the sintered substrates by a selective wet chemical etch process. Therefore, LTCC substrates with areas of low as well as of high permittivity can be created without a material combination. The presented graphical method of material component contrast images enables the evaluation of the most important material properties after their local porosification which are their component distribution, their porosification gradient and their residual bearing surface. The graphical method, including focused ion beam and scanning electron microscopy analyses, is applied to different commercially available LTCC types having two porosification states each. The derived mathematical models, suitable for finite element method implementation, allow the characterization of the effective permittivity reduction while keeping a maximum residual surface area for e.g. metallization purposes. The shape of the optimum material distribution function features an ‘air pocket’ of small width and a depth being dependent on the application specific operating frequency.},
    }
  • [DOI] S. Schröter, J. Brendel, R. Weigel, and G. Fischer, "Performance Improvement of UMTS Uplink Beamsteering with Limited Feedback at Higher Terminal Velocity by Designing Adapted Algorithms" in International Conference on Communications, 2013. [Bibtex]
    @inproceedings{schroeter2013b,
    author  = {Schröter, Simon and Brendel, Johannes and Weigel, Robert and Fischer, Georg},
    title  = {Performance Improvement of UMTS Uplink Beamsteering with Limited Feedback at Higher Terminal Velocity by Designing Adapted Algorithms},
    booktitle  = {{International Conference on Communications}},
    year  = {2013},
    month  = {11},
    doi  = {10.1109/ICC.2014.6884219},
    location  = {Sydney, Australia},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1107},
    }
  • [DOI] M. Pour Mousavi, M. Wojnowski, R. Agethen, R. Weigel, and A. Hagelauer, "Antenna Array in eWLB for 61 GHz FMCW Radar" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, 2013, pp. 310-312. [Bibtex]
    @inproceedings{pourmousavi2013c,
    author  = {Pour Mousavi, Mehran and Wojnowski, Maciej and Agethen, Roman and Weigel, Robert and Hagelauer, Amelie},
    title  = {Antenna Array in eWLB for 61 GHz FMCW Radar},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications}},
    year  = {2013},
    month  = {11},
    pages  = {310--312},
    doi  = {10.1109/APMC.2013.6695129},
    location  = {Seoul},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1686},
    }
  • S. Rieß and C. Spratler, "Concept and Implementation of a Scanning Receiver" in Final C-PMSE Workshop, 2013, pp. 1-17. [Bibtex]
    @inproceedings{riess2013b,
    author  = {Rieß, Steffen and Spratler, Christian},
    title  = {Concept and Implementation of a Scanning Receiver},
    booktitle  = {{Final C-PMSE Workshop}},
    year  = {2013},
    month  = {11},
    day  = {19},
    pages  = {1--17},
    location  = {Erlangen, Germany},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1334},
    }
  • S. Rieß, J. Brendel, S. Schröter, and G. Fischer, "Intelligente Funkmikrofone - Spektrumserfassung für Cognitive-Radio-Systeme", 2013. [Bibtex]
    @other{riess2013a,
    author  = {Rieß, Steffen and Brendel, Johannes and Schröter, Simon and Fischer, Georg},
    title  = {Intelligente Funkmikrofone - Spektrumserfassung für Cognitive-Radio-Systeme},
    booktitle  = {{DESIGN&ELEKTRONIK}},
    year  = {2013},
    month  = {11},
    url  = {http://www.elektroniknet.de/kommunikation/wireless/artikel/103608},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1168},
    abstract  = {Die Hersteller von professioneller, drahtloser Produktionstechnik sehen sich zunehmend mit steigenden Anforderungen für den interferenzfreien Betrieb ihrer Systeme konfrontiert. Die Gründe dafür liegen in der Digitalen Dividende sowie Änderungen in der Regulierung durch die Bundesnetz-agentur im Frequenzbereich von 470-862 MHz. Ein Ansatz zur Lösung dieser Problematik stellt die Cognitive-Radio-Technologie dar, wobei die vorherrschende Funkumgebung überwacht und daraus ggf. die Entscheidung für einen Frequenzwechsel im Falle einer Störung getroffen wird.},
    }
  • S. Linz, G. Vinci, S. Lindner, S. Mann, F. Barbon, R. Weigel, and A. Koelpin, "A Compact, Versatile Six-Port Radar Sensor for Industrial and Medical Applications" in IEEE Sensors, 2013. [Bibtex]
    @inproceedings{linz2013a,
    author  = {Linz, Sarah and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A Compact, Versatile Six-Port Radar Sensor for Industrial and Medical Applications},
    booktitle  = {{IEEE Sensors}},
    year  = {2013},
    month  = {11},
    location  = {Baltimore, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1170},
    abstract  = {The Six-Port receiver can be implemented as an alternative radar architecture. Plenty of current scientific publications demonstrate the effectiveness and versatility of the Six-Port radar for industrial, automotive and medical applications: accurate contactless vibration analysis, distance measurements as well as remote breath and heartbeat monitoring. Its highlights are excellent phase discrimination, trivial signal processing, low circuit complexity and cost. A joint project involving the University of Erlangen-Nuremberg and InnoSenT GmbH led to the development of iSYS-5001, a compact, versatile Six-Port radar module aiming at a reliable high-integration of all subcomponents in one single sensor unit.},
    }
  • H. Milosiu, F. Oehler, and R. Weigel, "A 2.4-µA 868-MHz low latency wake-up receiver for strong interference channels" in European Microwave Integrated Circuits Conference, 2013, pp. 304-307. [Bibtex]
    @inproceedings{milosiu2013,
    author  = {Milosiu, Heinrich and Oehler, Frank and Weigel, Robert},
    title  = {A 2.4-µA 868-MHz low latency wake-up receiver for strong interference channels},
    booktitle  = {{European Microwave Integrated Circuits Conference}},
    year  = {2013},
    month  = {10},
    pages  = {304--307},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1704},
    abstract  = {This paper describes an innovative approach for integrated ultra-low current wireless receivers for UHF bands in a 180-nm CMOS technology. The classical method of slow periodic switching off of the receiver was picked up, essentially enhanced and applied to a superheterodyne receiver topology. A novel fast sampling pulse operation method for ultra low power integrated receivers is presented meeting both short reaction time and very low power consumption requirements. In addition, the receiver was designed for radio channels with strong interferers. The presented ASIC comprises both an analogue front-end and two digital 31 bit correlating decoders. The current consumption of the fabricated prototype is 2.4 μA at 3 volts supply voltage with a reaction time of 485 ms.},
    }
  • [DOI] S. Müller, F. Lurz, R. Weigel, and A. Koelpin, "A High Performance Line Filter for Narrowband Power Line Communication Testbed Applications" in 2013 IEEE International Conference on Smart Grid Communications (SmartGridComm), 2013, pp. 690-695. [Bibtex]
    @inproceedings{mueller2013,
    author  = {Müller, Steffen and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    title  = {A High Performance Line Filter for Narrowband Power Line Communication Testbed Applications},
    booktitle  = {{2013 IEEE International Conference on Smart Grid Communications (SmartGridComm)}},
    year  = {2013},
    month  = {10},
    pages  = {690--695},
    doi  = {10.1109/SmartGridComm.2013.6688039},
    location  = {Vancouver, Canada},
    keywords  = {Power Line Communication,Smart Grid,Line Filter,Electromagnetic Interference,Testbed},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1142},
    abstract  = {This paper is presenting a two-stage line filter design, optimized for power line communication (PLC) testbed applications in the frequency range from 9 kHz to 500 kHz. The filter shows a very high differential mode attenuation together with a high input impedance on load-side. It enables to cope with the harsh noise characteristics of the PLC channel, as well as varying line access impedances in order to build up testbeds without any additional equipment. After exploring the filter’s architecture, SPICE simulations and measurement results are carried out, while the latter are discussed with respect to two commercial off-the-shelf filters.},
    }
  • I. Nasr, R. Weigel, and D. Kissinger, "A 50 to 100GHz frequency synthesizer with 17dB side-band suppression using a single VCO core" in The European Microwave Integrated Circuits Conference (EuMIC), 2013, pp. 89-92. [Bibtex]
    @inproceedings{nasr2013a,
    author  = {Nasr, Ismail and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 50 to 100GHz frequency synthesizer with 17dB side-band suppression using a single VCO core},
    booktitle  = {{The European Microwave Integrated Circuits Conference (EuMIC)}},
    year  = {2013},
    month  = {10},
    day  = {07},
    pages  = {89--92},
    location  = {Nuremberg},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1097},
    }
  • [DOI] J. Brendel, S. Rieß, R. Weigel, and G. Fischer, "A cognitive system for future‐proof wireless microphones: Concept, Implementation and Results" in International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS), 2013. [Bibtex]
    @inproceedings{brendel2013a,
    author  = {Brendel, Johannes and Rieß, Steffen and Weigel, Robert and Fischer, Georg},
    title  = {A cognitive system for future‐proof wireless microphones: Concept, Implementation and Results},
    booktitle  = {{International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)}},
    year  = {2013},
    month  = {10},
    doi  = {10.1109/TELSKS.2013.6704934},
    location  = {Nis, Serbia},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1102},
    abstract  = {Since several years, 'cognitive radio' is given much attention in research and is seen as a future technology in communications. In this paper a cognitive radio system for Program Making and Special Event (PMSE) devices (e.g. wireless microphones) is presented and the results of a field test are discussed. First, we outline the challenges which the PMSE industry has to cope with and how changes in regulatory and the digital dividend in the TV UHF band has impact on the operation reliability of PMSE devices. Afterwards, a system using cognitive radio techniques to ensure the high audio quality requirements and interference free operation of PMSE devices under the previously mentioned circumstances is presented. Beside a general overview over the developed system we focus on a distributed spectrum sensing network as part of the cognitive information acquisition to monitor the current spectrum situation. The data is used by the cognitive engine to detect potential interferers and to trigger operation parameter changes (e.g. frequency or transmit power) of the PMSE devices to avoid link quality degradation. We present the built up sensor nodes for the spectrum measurement and the developed software to control the sensor nodes and to preprocess the measured data. Finally, the results, collected with the field test platform in the fairgrounds of Berlin, show convincingly how the developed cognitive system makes PMSE devices future‐proof.},
    }
  • S. Lindner, G. Vinci, F. Barbon, S. Linz, S. Mann, R. Weigel, and A. Koelpin, "Instantaneous frequency measurement based on low-cost Six-Port technology" in European Microwave Conference 2013, 2013, pp. 460-463. [Bibtex]
    @inproceedings{lindner2013a,
    author  = {Lindner, Stefan and Vinci, Gabor and Barbon, Francesco and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    title  = {Instantaneous frequency measurement based on low-cost Six-Port technology},
    booktitle  = {{European Microwave Conference 2013}},
    year  = {2013},
    month  = {10},
    pages  = {460--463},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    keywords  = {delay lines,frequency measurement,Detectors,millimeter wave measurement,phase measurement},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686691},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1407},
    abstract  = {This paper describes a new approach for absolute, high accuracy and fast responding millimeter wave frequency measurement. The shown system is based on the reduction of the frequency detection to a phase measurement with a delay line and a subsequent determination of the phase. By using a Six-Port structure, this phase can be evaluated very precisely, leading to a accurate frequency detection. Another remarkable point is the fast system response, because there is neither time consuming transformation to frequency domain nor long integration time required.},
    }
  • A. Koelpin, S. Lindner, S. Mann, F. Barbon, A. Talai, and R. Weigel, "The Six-Port Structure as a Precise Measurement Tool - A New Rise of an Old Concept" in Kleinheubacher Tagung, 2013. [Bibtex]
    @inproceedings{koelpin2013c,
    author  = {Koelpin, Alexander and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Talai, Armin and Weigel, Robert},
    title  = {The Six-Port Structure as a Precise Measurement Tool - A New Rise of an Old Concept},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2013},
    month  = {10},
    location  = {Kleinheubach, Germany},
    keywords  = {Six-Port,Interferometer},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1427},
    abstract  = {Six-Port Technique has been known in RF and microwave metrology since the early 1970s for vector network analysis and precise power measurements. Two decades later, the system has been proposed as a receiver for complex valued data reception. However, six-port technique has always been niche architecture, since the tremendous evolution in integrated circuit technology got more and more impact on high-end circuitry and measurement systems. But there are some special applications that can be very efficiently addressed by the six-port principle. In general, all scenarios where the interesting information is coded in signal power or can be translated in relative phase shifts are suitable for six-port systems, as this architecture offers superior phase resolution combined with low cost implementation. Furthermore, this principle can be used up to millimeter-wave frequencies and even higher. The reason is that the core functionality is realized only by passive transmission lines or waveguide structures featuring the interferometric part, and only diodes have to be used as monolithic components for the RF front-end. The information reconstruction is conducted in baseband by algorithms with very low complexity that can be run on a low power microcontroller and show only low latency of a few controller clock cycles. In this talk the newest results for applications addressed by six-port architecture for metrology will be presented. Besides very precise distance and angle measurements or vibration analysis, like heartbeat and breath rate detection, also new fields will be presented. One very promising approach is using the six-port technique for frequency analysis of a pulse-like microwave signal. Furthermore, the very first results in temperature measurements of a water basin by a six-port reflectometer will be shown.},
    }
  • M. Hartmann, O. Günther, and R. Weigel, "Mischerstrukturen fuer Automotive Radaranwendungen" in VDE-Kongress 2006 - Innovations for Europe - Fachtagungsberichte der ITG/BMBF - GMM - ETG - GMA - DGBMT, 2013, p. 363. [Bibtex]
    @inproceedings{hartmann2013a,
    author  = {Hartmann, Marcus and Günther, Oliver and Weigel, Robert},
    title  = {Mischerstrukturen fuer Automotive Radaranwendungen},
    booktitle  = {{VDE-Kongress 2006 - Innovations for Europe - Fachtagungsberichte der ITG/BMBF - GMM - ETG - GMA - DGBMT}},
    year  = {2013},
    month  = {10},
    pages  = {363},
    location  = {Aachen, DE},
    publisher  = {VDE Verlag GmbH},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1430},
    }
  • G. Vinci, S. Lindner, S. Mann, F. Barbon, S. Linz, R. Weigel, and A. Koelpin, "Six-port microwave interferometer radar for mechanical vibration analysis" in European Microwave Conference (EuMC) 2013, 2013, pp. 1599-1602. [Bibtex]
    @inproceedings{vinci2013a,
    author  = {Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {Six-port microwave interferometer radar for mechanical vibration analysis},
    booktitle  = {{European Microwave Conference (EuMC) 2013}},
    year  = {2013},
    month  = {10},
    pages  = {1599--1602},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686978},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1420},
    }
  • A. Talai, R. Weigel, and A. Koelpin, "Field Distributions and Effective Permittivities Along Microstrip Structures on Homogeneous and Inhomogeneous Substrates up to110 GHz" in IEEE European Microwave Conference 2013, 2013. [Bibtex]
    @inproceedings{talai2013d,
    author  = {Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    title  = {Field Distributions and Effective Permittivities Along Microstrip Structures on Homogeneous and Inhomogeneous Substrates up to110 GHz},
    booktitle  = {{IEEE European Microwave Conference 2013}},
    year  = {2013},
    month  = {10},
    day  = {03},
    location  = {Nuremberg, Germany},
    publisher  = {Rohde and Schwarz},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1179},
    }
  • A. Koelpin, G. Vinci, S. Lindner, S. Mann, F. Barbon, S. Linz, F. Oesterle, and R. Weigel, "Six-port technology for precise geometrical measurement applications - an overview" in European Microwave Conference (EuMC) 2013, 2013, pp. 1587-1590. [Bibtex]
    @inproceedings{koelpin2013b,
    author  = {Koelpin, Alexander and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Linz, Sarah and Oesterle, Florian and Weigel, Robert},
    title  = {Six-port technology for precise geometrical measurement applications - an overview},
    booktitle  = {{European Microwave Conference (EuMC) 2013}},
    year  = {2013},
    month  = {10},
    pages  = {1587--1590},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686975},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1421},
    abstract  = {Instrumentation for precise geometrical measurements based on radar technology get more and more important for industrial applications. Besides distance, determining an angle or modal analysis of vibrations are key issues for automation in modern fabrication. Industrial applications put high demands on the measurement systems, not only regarding precision but also concerning operation in harsh environments and low cost implementations. In the last years Six-Port technology got more and more important for these applications. This paper will give an overview of Six-Port technique for geometrical distance measurements.},
    }
  • A. Tag, J. Leinhos, G. Hechtfischer, M. Leibfritz, and T. Eibert, "1mm Coaxial Matches with an Excellent Absorption Behavior over the Frequency Range 0 - 110 GHz" in European Microwave Conference, 2013, pp. 1299-1302. [Bibtex]
    @inproceedings{tag2013,
    author  = {Tag, Andreas and Leinhos, Jens and Hechtfischer, Gerd and Leibfritz, Martin and Eibert, Thomas},
    title  = {1mm Coaxial Matches with an Excellent Absorption Behavior over the Frequency Range 0 - 110 GHz},
    booktitle  = {{European Microwave Conference}},
    year  = {2013},
    month  = {10},
    pages  = {1299--1302},
    location  = {Nuremberg},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1063},
    abstract  = {Combining a theory for reflection free termination of coaxial lines together with a novel manufacturing method results in coaxial 1-mm matches with an excellent absorption behavior over the frequency range from 0 to 110 GHz. Three different electromagnetic simulation approaches verify the capability of these matches to achieve smaller reflection coefficients than -43 dB over the whole frequency range and matches with a maximum reflection coefficient of only -32 dB have been produced.},
    }
  • R. Agethen, M. Pour Mousavi, P. Mengs, R. Weigel, and D. Kissinger, "FPGA-based signal control for highly integrated 60 GHz radar distance measurements" in European Radar Conference, 2013, pp. 121-124. [Bibtex]
    @inproceedings{agethen2013a,
    author  = {Agethen, Roman and Pour Mousavi, Mehran and Mengs, P. and Weigel, Robert and Kissinger, Dietmar},
    title  = {FPGA-based signal control for highly integrated 60 GHz radar distance measurements},
    booktitle  = {{European Radar Conference}},
    year  = {2013},
    month  = {10},
    pages  = {121--124},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1412},
    }
  • [DOI] E. Seler, M. Wojnowski, R. Weigel, and A. Hagelauer, "New Simulation Procedure for Accurate Package Modeling Considering Chip-Package Interaction" in IEEE Conference Electrical Performance of Electronic Packaging and Systems, 2013, pp. 43-46. [Bibtex]
    @inproceedings{seler2013,
    author  = {Seler, Ernst and Wojnowski, Maciej and Weigel, Robert and Hagelauer, Amelie},
    title  = {New Simulation Procedure for Accurate Package Modeling Considering Chip-Package Interaction},
    booktitle  = {{IEEE Conference Electrical Performance of Electronic Packaging and Systems}},
    year  = {2013},
    month  = {10},
    pages  = {43--46},
    doi  = {10.1109/EPEPS.2013.6703463},
    location  = {San Jose, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1694},
    }
  • R. Schnabel, D. Steinbuch, and R. Weigel, "An ISO 26262 compliant built-in self-test for 77 GHz automotive radar sensors" in European Radar Conference, 2013. [Bibtex]
    @inproceedings{schnabel2013a,
    author  = {Schnabel, Raik and Steinbuch, Dirk and Weigel, Robert},
    title  = {An ISO 26262 compliant built-in self-test for 77 GHz automotive radar sensors},
    booktitle  = {{European Radar Conference}},
    year  = {2013},
    month  = {10},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1125},
    }
  • U. Schwerthöffer, R. Weigel, and D. Kissinger, "Microwave Sensor for Precise Permittivity Characterization of Liquids Used for Aqueous Glucose Detection in Medical Applications" in German Microwave Conference 2014, 2013, pp. 1-2. [Bibtex]
    @inproceedings{schwerthoeffer2013e,
    author  = {Schwerthöffer, Udo and Weigel, Robert and Kissinger, Dietmar},
    title  = {Microwave Sensor for Precise Permittivity Characterization of Liquids Used for Aqueous Glucose Detection in Medical Applications},
    booktitle  = {{German Microwave Conference 2014}},
    year  = {2013},
    month  = {10},
    day  = {26},
    pages  = {1--2},
    publisher  = {VDE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1249},
    }
  • A. Schwarzmeier, "Wireless Power for Charging Health Assistance Watches" in IEEE European Microwave Week, 2013. [Bibtex]
    @inproceedings{schwarzmeier2013c,
    author  = {Schwarzmeier, Andre},
    title  = {Wireless Power for Charging Health Assistance Watches},
    booktitle  = {{IEEE European Microwave Week}},
    year  = {2013},
    month  = {10},
    day  = {06},
    location  = {Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1426},
    }
  • S. Pinarello, J. Müller, and R. Weigel, "Extension of the Load-Line Theory by Investigating the Impact of the Knee-Voltage on Output-Power and Efficiency" in European Microwave Integrated Circuits Conference, 2013, pp. 488-491. [Bibtex]
    @inproceedings{sandro2013,
    author  = {Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    title  = {Extension of the Load-Line Theory by Investigating the Impact of the Knee-Voltage on Output-Power and Efficiency},
    booktitle  = {{European Microwave Integrated Circuits Conference}},
    year  = {2013},
    month  = {10},
    pages  = {488--491},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1788},
    abstract  = {The standard load-line theory for power amplifier (PA) design becomes inaccurate when the ratio of the transistor's knee-voltage to the supply voltage gets larger than one. This is often the case for sub-micron CMOS PA designs due to low breakdown voltage. Based on simple geometrical reasoning the load-line theory is generalized to include these cases. The optimum load impedance that results in maximum output power, the maximum power achieved, and the corresponding efficiency are derived in closed form. The efficiency can be improved by backing off the output power. The trade-off between output power and simultaneously achievable efficiency as a function of the knee-voltage is discussed.},
    }
  • K. Borutta, B. Lämmle, C. Wagner, L. Maurer, R. Weigel, and D. Kissinger, "Design and Breakdown Behavior of 77GHz Variable Gain Power Amplifiers in SiGe- Technology" in European Microwave Conference (EuMC), 2013, 2013, pp. 1543-1546. [Bibtex]
    @inproceedings{borutta2013,
    author  = {Borutta, Karl and Lämmle, Benjamin and Wagner, Christoph and Maurer, Linus and Weigel, Robert and Kissinger, Dietmar},
    title  = {Design and Breakdown Behavior of 77GHz Variable Gain Power Amplifiers in SiGe- Technology},
    booktitle  = {{European Microwave Conference (EuMC), 2013}},
    year  = {2013},
    month  = {10},
    pages  = {1543--1546},
    location  = {Nuremberg, DE},
    keywords  = {differential amplifiers,electric breakdown,millimetre wave bipolar transistors,millimetre wave power amplifiers,millimetre wave radar,programmable circuits,temperature measurement,Current measurement},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686964},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1320},
    abstract  = {This paper presents two fully integrated differential programmable power amplifiers for automotive radar applications at 77GHz. The power amplifiers were fabricated in a silicon-germanium technology featuring bipolar transistors with an ft/fmax of 200GHz/250GHz. Measurements have been performed for different temperatures, in particular at -40°, 27° and 125°. A maximum gain of 10 dB is achieved for both amplifiers at room temperature. In addition the breakdown behavior of both amplifiers has been investigated. The building blocks of the amplifiers, which are affected by the breakdown effect had been indentified and design guidelines to avoid breakdown effects in power amplifiers are presented.},
    }
  • F. Steinhäußer, A. Talai, A. Koelpin, R. Weigel, A. Bittner, and U. Schmid, "The impact of the material distribution of porousified LTCC on the effective permittivity investigated by finite 3D field simulation" in Mikrosystemtechnik Kongress 2013, 2013. [Bibtex]
    @inproceedings{steinhaeusser2013,
    author  = {Steinhäußer, Frank and Talai, Armin and Koelpin, Alexander and Weigel, Robert and Bittner, Achim and Schmid, Ulrich},
    title  = {The impact of the material distribution of porousified LTCC on the effective permittivity investigated by finite 3D field simulation},
    booktitle  = {{Mikrosystemtechnik Kongress 2013}},
    year  = {2013},
    month  = {10},
    location  = {Aachen, Germany},
    publisher  = {GMM VDE/VDI-Gesellschaft Mikroelektronik, Mikrosystem- und Feinwerktechnik},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1131},
    abstract  = {Apart from other advantages, such as its robustness, the high permittivity of LTCC (Low Temperature Cofired Ceramics) multi layer technology is one of the most important reasons why it is nowadays well established in high frequency devices and systems. However, reduced emission is not desired in every application. Antennas require a substrate with a low permittivity in order to achieve maximum emitter efficiencies. The chemical composition of LTCC allows the local introduction of air by means of a selective etch process. Due to this selective and diffusion controlled process the generated porousification is not homogeneous depending on the penetration depth. On the basis of measured lateral material distributions, the effect on the effective permittivity can be shown by performing 3D field simulations. The distributions are graphically derived from material cuts, which were realized by focused ion beam technology. From the complex trends, conclusion regarding the alteration of the inner chemical phase distribution as well as the quality and the bearing capability of the surface can be obtained.},
    }
  • M. Pour Mousavi, M. Wojnowski, R. Agethen, R. Weigel, and A. Hagelauer, "Antenna Design and Characterization for a 61 GHz Transceiver in eWLB Package" in IEEE European Microwave Integrated Circuit Conference, 2013, pp. 444-447. [Bibtex]
    @inproceedings{pourmousavi2013b,
    author  = {Pour Mousavi, Mehran and Wojnowski, Maciej and Agethen, Roman and Weigel, Robert and Hagelauer, Amelie},
    title  = {Antenna Design and Characterization for a 61 GHz Transceiver in eWLB Package},
    booktitle  = {{IEEE European Microwave Integrated Circuit Conference}},
    year  = {2013},
    month  = {10},
    pages  = {444--447},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1693},
    }
  • J. Rascher, A. Zohny, and R. Weigel, "Integrated Reconfigurable CMOS Power Amplifiers" in European Microwave Conference (EuMC), 2013. [Bibtex]
    @inproceedings{rascher2013a,
    author  = {Rascher, Jochen and Zohny, Amr and Weigel, Robert},
    title  = {Integrated Reconfigurable CMOS Power Amplifiers},
    booktitle  = {{European Microwave Conference (EuMC)}},
    year  = {2013},
    month  = {10},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1059},
    abstract  = {Technologies for Embedded Wireless Systems Workshop},
    }
  • S. Rieß, J. Brendel, A. Stöckle, R. Rose, and G. Fischer, "Components and Implementation of a Spectrum Sensing Network for the UHF TV Band" in European Microwave Conference (EuMC), 2013, pp. 1091-1094. [Bibtex]
    @inproceedings{riess2013,
    author  = {Rieß, Steffen and Brendel, Johannes and Stöckle, Andreas and Rose, Richard and Fischer, Georg},
    title  = {Components and Implementation of a Spectrum Sensing Network for the UHF TV Band},
    booktitle  = {{European Microwave Conference (EuMC)}},
    year  = {2013},
    month  = {10},
    pages  = {1091--1094},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1057},
    abstract  = {Spectrum sensing is a major part for the implementation of Cognitive Radio (CR) systems in order to enable dynamic access to the radio frequency spectrum. This paper is about a Spectrum Sensing Network (SSN) which generates an accurate radio environment map (i.e. power over frequency, time and location) in the UHF TV band from 470–870 MHz. It consists of a distributed network of multiple receivers with a broadband antenna and a central data management and storage unit. This contribution focuses on the implementation of such a scanning network which has been setup as universal research platform in several halls at the fairground in Berlin. The SSN itself is part of a complex CR system for Professional Wireless Microphone Systems (PWMS) that is able to provide a dynamic frequency allocation of the connected radio links.},
    }
  • M. Hamouda, F. Scotto di Clemente, M. Hein, G. Fischer, R. Weigel, and T. Ußmüller, "Ultra Wide Band Low-Power Amplifier Integrated on Miniaturized Antenna for Biomedical Applications" in European Radar Conference (EuRAD), 2013, pp. 423-426. [Bibtex]
    @inproceedings{hamouda2013,
    author  = {Hamouda, Mohammed and Scotto di Clemente, Francesco and Hein, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Ultra Wide Band Low-Power Amplifier Integrated on Miniaturized Antenna for Biomedical Applications},
    booktitle  = {{European Radar Conference (EuRAD)}},
    year  = {2013},
    month  = {10},
    pages  = {423--426},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1061},
    }
  • A. Talai, B. Gmeiner, F. Steinhäußer, A. Bittner, U. Rüde, U. Schmid, R. Weigel, and A. Koelpin, "Electromagnetic Field Analysis with Advanced Structural Modeling of Microstrips on Porosified LTCC" in Proceedings of the European Microwave Conference 2013, 2013, pp. 440-443. [Bibtex]
    @inproceedings{talai2013c,
    author  = {Talai, Armin and Gmeiner, Björn and Steinhäußer, Frank and Bittner, Achim and Rüde, Ulrich and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {Electromagnetic Field Analysis with Advanced Structural Modeling of Microstrips on Porosified LTCC},
    booktitle  = {{Proceedings of the European Microwave Conference 2013}},
    year  = {2013},
    month  = {10},
    pages  = {440--443},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    keywords  = {Field simulation,structural modeling,LTCC,reduction of permittivity,porosification,inhomogeneous substrate},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686686},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1077},
    abstract  = {Recent investigations demonstrated that porosification offers the possibility of high quality antenna integration on LTCC by local reduction of the relative permittivity. In order to take advantage of this technology, further research for the deposition of conductors on porosified areas has to be done. Since the near-surface material removal is strong, conductors are expected to penetrate substantially into the porosified substrate. In this paper a new, randomized structural modeling technique of porosified LTCC is presented, which is based on scanning electron microscope imaging. Finite 3D field simulations, performed with this model, show the electromagnetic effects of different vertical microstrip positions on the effective permittivity and the corresponding scattering parameters.},
    }
  • [DOI] M. Gardill, K. Finkenzeller, W. Hinz, G. Fischer, R. Weigel, and A. Koelpin, "A Review and Comparative Study of On- and Off-Body Performance of Platform-Tolerant UHF RFID Tag Antennas" in 8th International Conference on Body Area Networks, 2013. [Bibtex]
    @inproceedings{gardill2013f,
    author  = {Gardill, Markus and Finkenzeller, Klaus and Hinz, Walter and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {A Review and Comparative Study of On- and Off-Body Performance of Platform-Tolerant UHF RFID Tag Antennas},
    booktitle  = {{8th International Conference on Body Area Networks}},
    year  = {2013},
    month  = {10},
    day  = {30},
    doi  = {10.4108/icst.bodynets.2013.253614},
    location  = {Boston, Massachusetts, United States},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1103},
    abstract  = {This paper addresses the remote identifying of human subjects by means of UHF RFID tags. In particular, we provide a comprehensive review of recent approaches in the design of compact, platform-tolerant UHF RFID antennas for on- as well as off-body applications. We first categorize previously published antenna designs and interrelate the various approaches. We then provide detailed simulation results for several selected design approaches, and compare the performance of the proposed antenna structures when used in free-space, placed in proximity to a homogenous phantom half-space model, and when used on or in proximity to a layered elliptical body model. We provide a comparative study by evaluating all approaches using the same figure of merits, which are the power transfer and the estimated read range, evaluated in exactly the same simualtion environment for all approaches.},
    }
  • [DOI] A. Gharib, G. Fischer, R. Weigel, and D. Kissinger, "A broadband 24 GHz bandwidth 54 dB gain 180-mW amplifier employing common-collector combinded with capacitive controlled cross-coupled feedback in 0.35 um SiGe technology" in IEEE Bipolar/BiCMOS Circuits and Technology Meeting, 2013, pp. 115-118. [Bibtex]
    @inproceedings{gharib2013,
    author  = {Gharib, Ahmed and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A broadband 24 GHz bandwidth 54 dB gain 180-mW amplifier employing common-collector combinded with capacitive controlled cross-coupled feedback in 0.35 um SiGe technology},
    booktitle  = {{IEEE Bipolar/BiCMOS Circuits and Technology Meeting}},
    year  = {2013},
    month  = {10},
    pages  = {115--118},
    doi  = {10.1109/BCTM.2013.6798157},
    location  = {Bordeaux, France},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1413},
    }
  • S. Glock, F. Reutelhuber, R. Rosales, M. Glaß, J. Teich, G. Fischer, R. Weigel, and T. Ußmüller, "Scenario-Based Energy Estimation of Heterogeneous Integrated Systems at System Level" in European Microwave Conference 2013, 2013, pp. 1-4. [Bibtex]
    @inproceedings{glock2013b,
    author  = {Glock, Stefan and Reutelhuber, Franz and Rosales, Rafael and Glaß, Michael and Teich, Jürgen and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Scenario-Based Energy Estimation of Heterogeneous Integrated Systems at System Level},
    booktitle  = {{European Microwave Conference 2013}},
    year  = {2013},
    month  = {10},
    day  = {10},
    pages  = {1--4},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1178},
    abstract  = {One of the most important figures of merit concerning mobile devices is their energy efficiency. However, the modeling of such systems is mainly focused on the functional aspects, but not on the power consumption. Therefore, power estimations can only be accomplished late in the design process, after all architectural decisions have been taken. This might lead to designs that are not optimal with respect to power consumption. To overcome these limitations, this article proposes an efficient and flexible power modeling methodology at system level for heterogeneous integrated systems, allowing to combine state-dependent and environmental dependent power models. In a case study, the energy consumption of an RF transceiver of a mobile phone is estimated in a real-life scenario, including the baseband module, the radio channel, and the base transceiver station in a simulative way.},
    }
  • S. Pinarello, J. Müller, and R. Weigel, "Comparative Evaluation of Different Current Saving Strategies for Power Amplifiers in Back-Off Operation" in European Microwave Conference (EuMC), 2013, pp. 557-560. [Bibtex]
    @inproceedings{weigel2013a,
    author  = {Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    title  = {Comparative Evaluation of Different Current Saving Strategies for Power Amplifiers in Back-Off Operation},
    booktitle  = {{European Microwave Conference (EuMC)}},
    year  = {2013},
    month  = {10},
    pages  = {557--560},
    location  = {Nuremberg, DE},
    keywords  = {modulation,power amplifiers,power transistors,DCB,DVB,LM,back-off operation,battery current,current saving strategies,dynamic current biasing,Digital video broadcasting,Frequency measurement},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686716},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1306},
    abstract  = {Three different methodologies are compared, which are suitable for saving battery current of a power amplifier operated in back-off. Dynamic Voltage Biasing (DVB), Dynamic Current Biasing (DCB), and Load Modulation (LM) have been paired in three different ways and experimentally tested for the first time on the same power transistor to achieve meaningful conclusions. Measurement results from on-wafer load-pull investigation of a SiGe power cell identify the combination of DVB and DCB as the most profitable strategy. This mode manifests a power added efficiency higher than 75\% for an excellent 14dB back-off dynamic.},
    }
  • A. Zohny, S. Leuschner, J. Rascher, S. Pinarello, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "Analog Compensation of AM-AM and AM-PM effects for HighEfficiency Stacked-FET Power Amplifiers in 65-nm Standard CMOS" in European Microwave Integrated Circuits Conference (EuMIC 2013), 2013, pp. 165-168. [Bibtex]
    @inproceedings{zohny2013a,
    author  = {Zohny, Amr and Leuschner, Stephan and Rascher, Jochen and Pinarello, Sandro and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {Analog Compensation of AM-AM and AM-PM effects for HighEfficiency Stacked-FET Power Amplifiers in 65-nm Standard CMOS},
    booktitle  = {{European Microwave Integrated Circuits Conference (EuMIC 2013)}},
    year  = {2013},
    month  = {10},
    pages  = {165--168},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    keywords  = {Power amplifier,Stacked FET,Stacked cascode,CMOS,linearization,ruggedness},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1065},
    abstract  = {Simultaneously achieving high linearity and high power-added efficiency (PAE) is essential for power amplifiers (PA) operating with modern communication signals. The challenge is exacerbated by the low breakdown voltages of standard CMOS realizations. This work presents a low-complexity programmable analog scheme to compensate the strong AM-AM and AM-PM nonlinearities of the high-ruggedness stacked-cascode topology while maintaining high PAE. The proposed solution utilizes standard NMOS devices to achieve peak PAE of 60\% at the 900 MHz band from a 3V supply. The compensation scheme manages to improve the output 1-dB compression point by up to 2 dB and keep the AM-PM variation within 5 degrees. The proposed method improves the linear output power (@ ACPR= -40 dBc) for a Class-AB power amplifier by up to 1.5 dB without compromising PAE or saturated output power},
    }
  • [DOI] Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, "An input amplitude modulated harmonic outphasing PA" in Mediterranean Microwave Symposium (Best Student Paper), 2013, pp. 1-4. [Bibtex]
    @inproceedings{abou-chahine2013,
    author  = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    title  = {An input amplitude modulated harmonic outphasing PA},
    booktitle  = {{Mediterranean Microwave Symposium (Best Student Paper)}},
    year  = {2013},
    month  = {09},
    pages  = {1--4},
    doi  = {10.1109/MMS.2013.6663082},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1699},
    }
  • [DOI] S. Linz, M. Hofmann, G. Fischer, R. Weigel, and D. Kissinger, "A Multiband 2-Port Vector Network Analyzer based on Six-Port Junctions for Biomedical Measurement Applications between 6 GHz and 33 GHz" in Antennas and Propagation in Wireless Communications (APWC), 2013 IEEE-APS Topical Conference on, 2013, pp. 532-535. [Bibtex]
    @inproceedings{linz2013,
    author  = {Linz, Sarah and Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Multiband 2-Port Vector Network Analyzer based on Six-Port Junctions for Biomedical Measurement Applications between 6 GHz and 33 GHz},
    booktitle  = {{Antennas and Propagation in Wireless Communications (APWC), 2013 IEEE-APS Topical Conference on}},
    year  = {2013},
    month  = {09},
    pages  = {532--535},
    doi  = {10.1109/APWC.2013.6624894},
    location  = {Turin, Italy},
    publisher  = {IEEE},
    keywords  = {Six-Port,multiband},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1252},
    abstract  = {Concentration measurements of dissolved substances in fluids are of great interest for biomedical as well as industrial applications. In this work a multiband vector network analyzer is presented that is capable of determining phase variations due to changes in the concentration. A topology comprising two Six-Port networks optimized for the frequencies 6.6 GHz, 19.7GHz and 32.4GHz has been implemented. Measurement results show a characteristic change of the phase when increasing the glucose concentration in binary aqueous solutions.},
    }
  • [DOI] G. Liu and H. Schumacher, "Broadband Millimeter-Wave LNAs (47-77 GHz and 70-140 GHz) Using a T-Type Matching Topology", IEEE Journal of Solid-State Circuits, vol. 48, iss. 9, pp. 2022-2029, 2013. [Bibtex]
    @article{liu2013,
    author  = {Liu, G. and Schumacher, Hermann},
    title  = {Broadband Millimeter-Wave LNAs (47-77 GHz and 70-140 GHz) Using a T-Type Matching Topology},
    journal  = {{IEEE Journal of Solid-State Circuits}},
    year  = {2013},
    month  = {09},
    pages  = {2022--2029},
    issn  = {0018-9200},
    doi  = {10.1109/JSSC.2013.2265500},
    publisher  = {IEEE},
    keywords  = {BiCMOS analogue integrated circuits,Ge-Si alloys,differential amplifiers,low noise amplifiers,millimetre wave amplifiers,millimetre wave integrated circuits,wideband amplifiers,BiCMOS technologies},
    volume  = {48},
    number  = {9},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1313},
    abstract  = {This paper presents the design and characterization of two broadband millimeter-wave LNAs realized in 0.25- μm and 0.13- μm SiGe BiCMOS technologies. Both circuits adopt a T-type matching topology to achieve the wide bandwidth (47-77 GHz for the V-band LNA and 70-140 GHz for the W/F-band LNA). The measured maximum gain is about 23 dB for both LNAs. The measured noise figure (NF) is below 7.2 dB (from 50 to 75 GHz) for the V-band LNA and below 7 dB (from 78 to 110 GHz) for the W/F-band LNA. Both LNAs are differential circuits and consume 52/54 mW dc power. To the best of the authors' knowledge, both LNAs achieve the widest bandwidth in corresponding frequency bands with very competitive gain and NF.},
    }
  • [DOI] A. Talai, F. Steinhäußer, B. Gmeiner, A. Bittner, U. Rüde, U. Schmid, R. Weigel, and A. Koelpin, "Electromagnetic Analysis of Fringed Microstrip Lines on Porosified LTCC" in ICEAA 2013 / IEEE International Conference on Electromagnetics in Advanced Applications, 2013, pp. 1189-1192. [Bibtex]
    @inproceedings{talai2013b,
    author  = {Talai, Armin and Steinhäußer, Frank and Gmeiner, Björn and Bittner, Achim and Rüde, Ulrich and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    title  = {Electromagnetic Analysis of Fringed Microstrip Lines on Porosified LTCC},
    booktitle  = {{ICEAA 2013 / IEEE International Conference on Electromagnetics in Advanced Applications}},
    year  = {2013},
    month  = {09},
    pages  = {1189--1192},
    doi  = {10.1109/ICEAA.2013.6632433},
    location  = {Turin, Italy},
    publisher  = {IEEE},
    keywords  = {Conductor edge,field simulation,fringed microstrip,structural modeling,LTCC,cofired,reduction of permittivity,porosification,inhomogeneous substrate},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1078},
    abstract  = {Recent investigations demonstrated that porosification of LTCC enables a local modification of material properties, in particular of the effective permittivity. These studies revealed that the electric field strength is highest at the lower conductor track edges on the porosified substrate. The local field strength peaks cause substantial influence on the effectiveness of permittivity reduction due near-surface material abrasions. In this paper, the influences of these randomly fringed boundaries on electromagnetic properties are investigated for different degrees of fraying. The gained results are compared to measured screen print edges by scanning electron microscope image analysis of co-fired and post-fired gold conductors, and will contribute for reliable circuit design on porous LTCC in the future.},
    }
  • C. Zeller, C. Muenker, and R. Weigel, "A 0.039 mm2 Inverter-Based 1.82 mW 68.6 dB-SNDR 10 MHz-BW CT-Sigma Delta-ADC in 65 nm CMOS" in ESSCirc, 2013, pp. 319-322. [Bibtex]
    @inproceedings{zeller2013,
    author  = {Zeller, Christian and Muenker, Christian and Weigel, Robert},
    title  = {A 0.039 mm2 Inverter-Based 1.82 mW 68.6 dB-SNDR 10 MHz-BW CT-Sigma Delta-ADC in 65 nm CMOS},
    booktitle  = {{ESSCirc}},
    year  = {2013},
    month  = {09},
    pages  = {319--322},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1858},
    }
  • C. Blümm, C. Heller, B. Fourestie, and R. Weigel, "Wideband aeronautical channel sounding and modeling for C-band telemetry" in IEEE 24th International Symposium on Personal indoor and Mobile Radio Communications (PIMRC), 2013, pp. 264-269. [Bibtex]
    @inproceedings{bluemm2013a,
    author  = {Blümm, Christian and Heller, Christoph and Fourestie, B. and Weigel, Robert},
    title  = {Wideband aeronautical channel sounding and modeling for C-band telemetry},
    booktitle  = {{IEEE 24th International Symposium on Personal indoor and Mobile Radio Communications (PIMRC)}},
    year  = {2013},
    month  = {09},
    day  = {10},
    pages  = {264--269},
    issn  = {2166-9570},
    location  = {London, UK},
    keywords  = {Aircraft,Chirp,Delays,Doppler shift,OFDM,Telemetry},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1302},
    abstract  = {A new aircraft-to-ground telemetry link in C-band, based on Orthogonal Frequency Division Multiplexing (OFDM), is currently being developed for Airbus. In order to parameterize this link adequately, information about the propagation channel is indispensable, in particular in terms of delay spread and Doppler spread. In order to identify these characteristics, a novel easy-to-use channel sounder was developed and successfully applied in multiple flight campaigns. With the channel sounding results, three typical environments could be clearly distinguished according to their specific charateristics: Parking & taxiing, take-off & landing and en-route. The measurement results are directly applicable as constant coefficients for tapped-delay line modeling. In contrast, classical approaches apply coefficients of stochastical nature, modeled as random variables. However, for a specific communication scenario, which we face here, the proposed approach yields much more accuracy and reliability, as it represents the exact real-world channels.},
    }
  • [DOI] S. Schröter, R. Weigel, and G. Fischer, "Employing Evolutionary Optimization for Designing Practical Beamsteering Algorithms for the Uplink of UMTS with Transmit Power Control Bits as Feedback" in International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), 2013, pp. 93-99. [Bibtex]
    @inproceedings{schroeter2013a,
    author  = {Schröter, Simon and Weigel, Robert and Fischer, Georg},
    title  = {Employing Evolutionary Optimization for Designing Practical Beamsteering Algorithms for the Uplink of UMTS with Transmit Power Control Bits as Feedback},
    booktitle  = {{International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT)}},
    year  = {2013},
    month  = {09},
    pages  = {93--99},
    issn  = {2157-0221},
    doi  = {10.1109/ICUMT.2013.6798411},
    location  = {Almaty, Kazakhstan},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1106},
    }
  • [DOI] M. Pour Mousavi, M. Wojnowski, R. Agethen, R. Weigel, and A. Hagelauer, "The Impact of embedded wafer level BGA Package on the Antenna Performance" in International Conference on Electromagnetics in Advanced Applications (ICEAA), 2013, pp. 828-831. [Bibtex]
    @inproceedings{pourmousavi2013a,
    author  = {Pour Mousavi, Mehran and Wojnowski, Maciej and Agethen, Roman and Weigel, Robert and Hagelauer, Amelie},
    title  = {The Impact of embedded wafer level BGA Package on the Antenna Performance},
    booktitle  = {{International Conference on Electromagnetics in Advanced Applications (ICEAA)}},
    year  = {2013},
    month  = {09},
    pages  = {828--831},
    doi  = {10.1109/APWC.2013.6624913},
    location  = {Torino, Italy},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1166},
    }
  • [DOI] M. Gardill, J. Schneider, F. Oesterle, G. Fischer, R. Weigel, and A. Koelpin, "Ultra-Wideband Small Antenna Subarray Module with Narrow Elevation Pattern" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, 2013. [Bibtex]
    @inproceedings{gardill2013e,
    author  = {Gardill, Markus and Schneider, J. and Oesterle, Florian and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Ultra-Wideband Small Antenna Subarray Module with Narrow Elevation Pattern},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications}},
    year  = {2013},
    month  = {09},
    doi  = {10.1109/APWC.2013.6624934},
    location  = {Torino, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1052},
    abstract  = {We propose an integrated small ultra-wideband antenna subarray module with narrow elevation pattern for future use in antenna arrays providing spatial processing capabilities such as Direction-Of-Arrival estimation in the azimuth plane, in the frequency range from 5 GHz to 8 GHz. The proposed subarray design is based on four mutually coupled Vivaldi antennas stacked on a common substrate in the E-Plane, with an element distance of delem 0;high=2. We optimize the antenna element in an infinite unit-cell stick array configuration and show that - in contrast to general believe - the truncation e ects when reducing the infinite stick-array to only four elements even reduce the total scan element reflection for broadside excitation. In addition, in contrast to most previously published E-Plane Vivaldi arrays, our design does not need a parallel-plate to microstrip balun at the feed point of each antenna element to realize an integrated planar feed network. Instead we use a novel ultra-wideband and geometrically small hybrid ring coupler to realize the array feed network directly in parallel plate technology, resulting in a low-cost, two-layer, single printed-circuit board integrated subarray module with narrow elevation pattern, operating from 5 GHz to 8 GHz.},
    }
  • [DOI] P. Jüschke and G. Fischer, "Neural Network based efficiency optimization method for RF Power Amplifiers with controllable Power Supply" in IEEE AFRICON, 2013, pp. 1-4. [Bibtex]
    @inproceedings{jueschke2013,
    author  = {Jüschke, Patrick and Fischer, Georg},
    title  = {Neural Network based efficiency optimization method for RF Power Amplifiers with controllable Power Supply},
    booktitle  = {{IEEE AFRICON}},
    year  = {2013},
    month  = {09},
    pages  = {1--4},
    doi  = {10.1109/AFRCON.2013.6757644},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1703},
    }
  • A. Koelpin, S. Lindner, S. Mann, F. Barbon, S. Linz, and R. Weigel, "Two- dimensional angle-of-arrival analysis by one enhanced six-port structure" in Progress In Electromagnetics Research Symposium, 2013. [Bibtex]
    @inproceedings{koelpin2013a,
    author  = {Koelpin, Alexander and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Linz, Sarah and Weigel, Robert},
    title  = {Two- dimensional angle-of-arrival analysis by one enhanced six-port structure},
    booktitle  = {{Progress In Electromagnetics Research Symposium}},
    year  = {2013},
    month  = {08},
    location  = {Stockholm, Sweden},
    publisher  = {PIERS},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1422},
    }
  • G. Fischer, "Does PMSE waste spectrum? - A balanced view from an engineer in Communications and Cellular" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2013. [Bibtex]
    @inproceedings{fischer2013,
    author  = {Fischer, Georg},
    title  = {Does PMSE waste spectrum? - A balanced view from an engineer in Communications and Cellular},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2013},
    month  = {07},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1553},
    }
  • [DOI] M. Hofmann, J. Nehring, R. Weigel, G. Fischer, and D. Kissinger, "A Wideband Scalar Network Analyzer for Biomedical Dehydration Measurements" in IEEE Engineering in Medicine and Biology Conference (EMBC), 2013. [Bibtex]
    @inproceedings{hofmann2013d,
    author  = {Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Wideband Scalar Network Analyzer for Biomedical Dehydration Measurements},
    booktitle  = {{IEEE Engineering in Medicine and Biology Conference (EMBC)}},
    year  = {2013},
    month  = {07},
    doi  = {10.1109/EMBC.2013.6610434},
    location  = {Osaka, Japan},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1090},
    abstract  = {This paper presents a wideband microwave ap- proach towards biomedical dehydration monitoring. The intro- duced concept is verified via invasive measurements on several blood samples. A microwave measurement circuit, based of a two-port scalar vector network analyzer is presented. The circuit operates between 5GHz and 20GHz using a planar permittivity sensor. Measurements of all subcomponents are shown together with measurements of a Water-NaCl-Glycerol solution.},
    }
  • V. Silva, "Challenges and opportunities toward a MEMS-based RF frontend for LTE" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2013. [Bibtex]
    @inproceedings{cortes2013,
    author  = {Silva, Victor},
    title  = {Challenges and opportunities toward a MEMS-based RF frontend for LTE},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2013},
    month  = {07},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1554},
    }
  • [DOI] F. Grimminger, G. Kowalczyk, H. Unterassinger, A. Schwarzmeier, G. Fischer, R. Weigel, and D. Kissinger, "Asynchronous Subthreshold CMOS Event Detector for Wireless BAN Sensor Nodes" in IEEE BioWireleSS, 2013, pp. 22-24. [Bibtex]
    @inproceedings{grimminger2013,
    author  = {Grimminger, Florian and Kowalczyk, G. and Unterassinger, H. and Schwarzmeier, Andre and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Asynchronous Subthreshold CMOS Event Detector for Wireless BAN Sensor Nodes},
    booktitle  = {{IEEE BioWireleSS}},
    year  = {2013},
    month  = {07},
    day  = {30},
    pages  = {22--24},
    doi  = {10.1109/BioWireleSS.2014.6827732},
    location  = {Newport Beach},
    publisher  = {IEEE},
    keywords  = {Subthreshold,Asynchronouse,Event detector,Wireless sensor node},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1105},
    abstract  = {This work presents the implementation of an asynchronous event detector circuit by applying subthreshold standard cells. The presented circuit operates in an on-chip power management unit (PMU) of a wireless sensor node. Such an application demands an ultra-low power architecture for an increased overall lifetime of the sensor node. The asynchronous circuit architecture and its subthreshold logic implementation both significantly reduce the leakage power dissipation by factor three. The presented event detector is realized in a 130 nm CMOS process with regular transistors operating from a 200 mV supply voltage.},
    }
  • G. Guarin, M. Hofmann, G. Fischer, R. Weigel, and D. Kissinger, "Microwave-based noninvasive sensing for biomedical applications", IEEE Life Sciences Newsletter, 2013. [Bibtex]
    @article{guarin2013a,
    author  = {Guarin, Gustavo and Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Microwave-based noninvasive sensing for biomedical applications},
    journal  = {{IEEE Life Sciences Newsletter}},
    year  = {2013},
    month  = {07},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1148},
    }
  • A. Costanzo, D. Masotti, T. Ußmüller, and R. Weigel, "Tag, you're it", IEEE Microwave Magazine, pp. 36-46, 2013. [Bibtex]
    @article{costanzo2013,
    author  = {Costanzo, A. and Masotti, D. and Ußmüller, Thomas and Weigel, Robert},
    title  = {Tag, you're it},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2013},
    month  = {07},
    pages  = {36--46},
    issn  = {1527-3342},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1119},
    }
  • U. Schwerthöffer, C. Warter, R. Weigel, and D. Kissinger, "A Microstrip Resonant Biosensor for Aqueous Glucose Detection in Microfluidic Medical Applications" in 2014 IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014), 2013, pp. 55-57. [Bibtex]
    @inproceedings{schwerthoeffer2013b,
    author  = {Schwerthöffer, Udo and Warter, Christoph and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Microstrip Resonant Biosensor for Aqueous Glucose Detection in Microfluidic Medical Applications},
    booktitle  = {{2014 IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014)}},
    year  = {2013},
    month  = {07},
    pages  = {55--57},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1164},
    }
  • U. Schwerthöffer, R. Weigel, and D. Kissinger, "A Highly Sensitive Glucose Biosensor Based on a Microstrip Ring Resonator" in 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, 2013, pp. 1-3. [Bibtex]
    @inproceedings{schwerthoeffer2013a,
    author  = {Schwerthöffer, Udo and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Highly Sensitive Glucose Biosensor Based on a Microstrip Ring Resonator},
    booktitle  = {{2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications}},
    year  = {2013},
    month  = {07},
    pages  = {1--3},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1163},
    }
  • A. Schwarzmeier, "Drahtloses Laden - Prinzip, Technik und Anwendung in einem Tele-Care Assistenz-System" in EEEfCOM – Hochfrequenzelektronik, Komponenten, Module, EMV, Medizintechnik und drahtlose Sensortechnik, 2013. [Bibtex]
    @inproceedings{schwarzmeier2013b,
    author  = {Schwarzmeier, Andre},
    title  = {Drahtloses Laden - Prinzip, Technik und Anwendung in einem Tele-Care Assistenz-System},
    booktitle  = {{EEEfCOM – Hochfrequenzelektronik, Komponenten, Module, EMV, Medizintechnik und drahtlose Sensortechnik}},
    year  = {2013},
    month  = {07},
    day  = {08},
    location  = {Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1425},
    }
  • U. Schwerthöffer, H. Adel, and R. Wansch, "Design and Implementation of a Ka-Band Corrugated Feed Horn for Reflector Antennas" in 2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting, 2013. [Bibtex]
    @inproceedings{schwerthoeffer2013c,
    author  = {Schwerthöffer, Udo and Adel, H. and Wansch, Rainer},
    title  = {Design and Implementation of a Ka-Band Corrugated Feed Horn for Reflector Antennas},
    booktitle  = {{2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting}},
    year  = {2013},
    month  = {07},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1165},
    }
  • A. Schwarzmeier, "Drahtloses Laden: Prinzip, Technik und Anwendung in einem Tele-Care Assistenz-System" in EEEfCOM, 2013. [Bibtex]
    @inproceedings{schwarzmeier2013a,
    author  = {Schwarzmeier, Andre},
    title  = {Drahtloses Laden: Prinzip, Technik und Anwendung in einem Tele-Care Assistenz-System},
    booktitle  = {{EEEfCOM}},
    year  = {2013},
    month  = {07},
    day  = {08},
    location  = {Ulm, Germany},
    keywords  = {Wireless Power,QI Standard,Tele Care,Medical Platform,Medical,Battery Charger},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1101},
    abstract  = {Insbesondere Tele-Care Assistenzsysteme profitieren durch die drahtlose Ladetechnik. So werden wasserdichte, desinfizierbare und anwenderfreundliche Assistenzsysteme ermöglicht.},
    }
  • I. Nasr, R. Weigel, and D. Kissinger, "Broadband Millimeter-Wave Receiver Front-Ends in Silicon-Germanium Technology for Multi-Band Communication Systems" in IEEE International Microwave Symposium, 2013. [Bibtex]
    @inproceedings{nasr2013,
    author  = {Nasr, Ismail and Weigel, Robert and Kissinger, Dietmar},
    title  = {Broadband Millimeter-Wave Receiver Front-Ends in Silicon-Germanium Technology for Multi-Band Communication Systems},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2013},
    month  = {06},
    day  = {1},
    location  = {Seattle, WA, USA},
    publisher  = {IEEE},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1023},
    abstract  = {Millimeter-wave frequency-agile front-ends capable of operating at different frequency bands offer an attractive solution for multiband communications. In this paper we present a fully integrated wide-band quadrature receiver covering the two point to point communication bands from 71 to 76 GHz and 81 to 86 GHz and the automotive radar band at 77 GHz. The receiver was fabricated using a low-cost SiGe technology with an ft/fmax of 200/250 GHz. The chip contains a wide-band LNA, Wilkinson power divider, down conversion mixers, two stage polyphase network, VCO, and frequency prescaler. The VCO achieves an ultra high tuning range of 33\% between 64 and 89 GHz. Each receiver path (I/Q) has a measured conversion gain between 17 to 23 dB over the operating frequency range. The receiver has a minimum NF of 8 dB, and an input referred compression point of -22 dBm. The complete chip consumes 220mA of current from a 3.3V supply. Index Terms—},
    }
  • [DOI] D. Sonner, T. Müller, M. Duell, and R. Weigel, "EMI Suppression Techniques for Broadcast Reception in Electric Vehicles" in IEEE 77th Vehicular Technology Conference (VTC Spring), 2013, pp. 1-5. [Bibtex]
    @inproceedings{sonner2013,
    author  = {Sonner, Daniel and Müller, Thomas and Duell, M. and Weigel, Robert},
    title  = {EMI Suppression Techniques for Broadcast Reception in Electric Vehicles},
    booktitle  = {{IEEE 77th Vehicular Technology Conference (VTC Spring)}},
    year  = {2013},
    month  = {06},
    day  = {03},
    pages  = {1--5},
    issn  = {1550-2252},
    doi  = {10.1109/VTCSpring.2013.6692535},
    location  = {Dresden, DE},
    keywords  = {active filters,amplitude modulation,broadcast communication,digital video broadcasting,electric vehicles,electromagnetic interference,filtering theory,interference suppression,frequency modulation},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1305},
    abstract  = {Electric driven vehicles become more and more important in today's mobile world. In addition to all its benefits, this technology has some drawbacks. Due to the electrical drive system, we measure higher voltages and higher currents. This is the reason why we get more electromagnetic interference (EMI) in the electric vehicle (EV). The highest requirements regarding EMI result from broadcast reception systems. The conventional approach of noise suppression with passive, active or hybrid filter structures and shielding increases the costs and the weight of the vehicle. In this paper a concept is presented, where the expensive shielding is replaced or supported by digital signal processing in the tuner. The active noise suppression can be supported by additional field probes. Therefore, the tuner can receive more information about the interferers. This principle works like the well-known "Active Noise Cancelling" (ANC). The algorithms have to be developed individually for each broadcast standard and are derived in this presentation for FM, AM and DVB T. Simulation results of the new approach demonstrate dramatic performance improvement in an EMI burdened car environment.},
    }
  • S. Schröter, "A Systematic Approach for Designing Beamsteering Algorithms for the Uplink of UMTS by Evolutionary Optimization Techniques" in IEEE Forum on Signal Processing for Radio Frequency Systems 2013, 2013. [Bibtex]
    @inproceedings{schroeter2013,
    author  = {Schröter, Simon},
    title  = {A Systematic Approach for Designing Beamsteering Algorithms for the Uplink of UMTS by Evolutionary Optimization Techniques},
    booktitle  = {{IEEE Forum on Signal Processing for Radio Frequency Systems 2013}},
    year  = {2013},
    month  = {06},
    day  = {18},
    location  = {Linz, Austria},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1064},
    }
  • [DOI] G. Guarin, M. Hofmann, R. Weigel, G. Fischer, and D. Kissinger, "Determination of sugar concentration in aqueous solutions using ultra-wideband microwave impedance spectroscopy" in IEEE MTT-S International Microwave Symposium, 2013, pp. 1-3. [Bibtex]
    @inproceedings{guarin2013,
    author  = {Guarin, Gustavo and Hofmann, Maximilian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Determination of sugar concentration in aqueous solutions using ultra-wideband microwave impedance spectroscopy},
    booktitle  = {{IEEE MTT-S International Microwave Symposium}},
    year  = {2013},
    month  = {06},
    pages  = {1--3},
    doi  = {10.1109/MWSYM.2013.6697563},
    location  = {Seattle, WA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1160},
    }
  • [DOI] N. Franchi, G. Fischer, and R. Weigel, "Radio Hardware In-the-Loop Emulation for Testing Vehicular Communication Systems" in 5th IEEE International Symposium on Wireless Vehicular Communications - VTC Spring 2013, 2013. [Bibtex]
    @inproceedings{franchi2013b,
    author  = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    title  = {Radio Hardware In-the-Loop Emulation for Testing Vehicular Communication Systems},
    booktitle  = {{5th IEEE International Symposium on Wireless Vehicular Communications - VTC Spring 2013}},
    year  = {2013},
    month  = {06},
    day  = {02},
    doi  = {10.1109/wivec.2013.6698242},
    location  = {Dresden, Germany},
    publisher  = {IEEE Vehicular Technology Society},
    keywords  = {Software Defined Radio,Vehicular Wireless Communication,Wireless Automotive Sensor Networks,Hardware In-the-Loop,IEEE 802.11p,IEEE 802.11b,USRP,RadioHIL},
    url  = {http://www.ieeevtc.org/wivec2013/},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1068},
    abstract  = {In this work, a novel test concept Radio Hardware In-the-Loop (RadioHIL) for next generation automotive electronic control units (ECUs) with wireless interfaces is proposed. The resulting test environment is well suited for ECUs networking with wireless sensors, actuators, mobile terminals or even with other vehicles and infrastructure elements. The presented RadioHIL approach is based on Software Defined Radio (SDR) architecture. The first step for executing the RadioHIL concept is the implementation of a multi-standard waveform design for automotive relevant purposes. Therefore the model-based implementations of two compliant IEEE 802.11b and 802.11p SDR transmitters are outlined, which are of interest for vehicular wireless communication. The emulation concept is demonstrated on the Universal Software Radio Peripheral (USRP) SDR platform.},
    }
  • [DOI] M. Wojnowski, R. Lachner, C. Wagner, G. Sommer, K. Pressel, and R. Weigel, "Embedded Wafer Level Ball Grid Array (eWLB) Technology for High-Frequency System-in-Package Applications" in IEEE MTT-S International Microwave Symposium Digest (IMS), 2013, pp. 1-4. [Bibtex]
    @inproceedings{wojnowski2013,
    author  = {Wojnowski, Maciej and Lachner, Rudolf and Wagner, Christoph and Sommer, Grit and Pressel, Klaus and Weigel, Robert},
    title  = {Embedded Wafer Level Ball Grid Array (eWLB) Technology for High-Frequency System-in-Package Applications},
    booktitle  = {{IEEE MTT-S International Microwave Symposium Digest (IMS)}},
    year  = {2013},
    month  = {06},
    pages  = {1--4},
    issn  = {0149-645X},
    doi  = {10.1109/MWSYM.2013.6697745},
    location  = {Seattle, WA},
    keywords  = {High-frequency measurements,packaging,passive circuits,thin-film inductors,wafer-scale integration},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1309},
    abstract  = {The embedded wafer level ball grid array (eWLB) is a novel system integration platform introduced recently. The eWLB technology is an attractive solution for high-frequency system-in-package (SiP) integration due to the capability to design high-quality (high-Q) embedded passives in the fan-out region and side-by-side multichip integration possibilities. In this paper, we show examples of using the fan-out region and the thin-film redistribution layer (RDL) advantageous for integration of inductors and antennas into an eWLB package. In addition, the use of the through encapsulant via (TEV) technology can extend the integration capabilities to 3D. We present measurement and simulation results of vertical interconnections realized using the RDL and TEVs of the eWLB. We demonstrate that the fan-out area of the eWLB can be used for the design of passive devices using the combination of TEV and RDL structures. We show examples of 3D inductors and transformers integrated in the eWLB. We present a fully integrated single-chip 60-GHz transceiver integrated in the eWLB package together with two dipole antennas as an example of mm-wave system integration.},
    }
  • [DOI] R. Agethen, M. Pour Mousavi, H. Forstner, M. Wojnowski, K. Pressel, R. Weigel, and D. Kissinger, "60 GHz industrial radar systems in silicon-germanium technology" in IEEE MTT-S international Microwave Symposium, 2013, pp. 1-3. [Bibtex]
    @inproceedings{agethen2013,
    author  = {Agethen, Roman and Pour Mousavi, Mehran and Forstner, Hans-Peter and Wojnowski, Maciej and Pressel, Klaus and Weigel, Robert and Kissinger, Dietmar},
    title  = {60 GHz industrial radar systems in silicon-germanium technology},
    booktitle  = {{IEEE MTT-S international Microwave Symposium}},
    year  = {2013},
    month  = {06},
    pages  = {1--3},
    doi  = {10.1109/MWSYM.2013.6697731},
    location  = {Seattle, WA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1161},
    }
  • [DOI] A. Talai, F. Steinhäußer, U. Schmid, R. Weigel, A. Bittner, and A. Koelpin, "A Finite 3D Field Simulation Method for Permittivity Gradient Implementation of a Novel Porosification Process in LTCC" in Microwave Symposium, 2013. IEEE/MTT-S International, 2013, pp. 1-4. [Bibtex]
    @inproceedings{talai2013a,
    author  = {Talai, Armin and Steinhäußer, Frank and Schmid, Ulrich and Weigel, Robert and Bittner, Achim and Koelpin, Alexander},
    title  = {A Finite 3D Field Simulation Method for Permittivity Gradient Implementation of a Novel Porosification Process in LTCC},
    booktitle  = {{Microwave Symposium, 2013. IEEE/MTT-S International}},
    year  = {2013},
    month  = {06},
    pages  = {1--4},
    issn  = {0149-645X},
    doi  = {10.1109/MWSYM.2013.6697583},
    location  = {Seattle, USA},
    publisher  = {IEEE},
    keywords  = {Field simulation,LTCC,local reduction of permittivity,porosification,wet chemical etching,inhomogeneous substrate,permittivity gradient},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1076},
    abstract  = {High frequency substrates show a manifold variety of complex permittivities for different applications. Recent research results demonstrated the possibility of local decrease of the permittivity on LTCC by chemical etching processes, which enables the design of high quality antennas on LTCC. This paper shows a novel approach on the determination of the quantitative reduction of the effective permittivity by scanning electron microscope analyses in combination with finite 3D field simulations of the resulting inhomogeneous material. By the characterization of two different porosified LTCCs it could be shown that this process is suitable for direct antenna integration on glass-ceramic substrates with enhanced values of relative permittivities.},
    }
  • [DOI] M. Hofmann, S. Linz, R. Weigel, G. Fischer, and D. Kissinger, "A Multiband 2-Port VNA for Biomedical Applications based on two Six-Port-Junctions" in IEEE International Microwave Symposium, 2013. [Bibtex]
    @inproceedings{hofmann2013c,
    author  = {Hofmann, Maximilian and Linz, Sarah and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Multiband 2-Port VNA for Biomedical Applications based on two Six-Port-Junctions},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2013},
    month  = {06},
    doi  = {10.1109/MWSYM.2013.6697658},
    location  = {Seattle},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1087},
    abstract  = {This paper presents a triple band two port vector network analyzer (VNA) consisting of two six-port-junctions for biomedical concentration measurements. The microwave sensing system is designed to operate with a 10\% bandwidth around 6.6 GHz, 19.7 GHz and 32.4 GHz. An embedded coplanar permit- tivity sensor will be applied for measurements of aqueous glucose solutions. The entire microwave sensing system is designed, fab- ricated and characterized with different glucose concentrations in binary solutions.},
    }
  • [DOI] S. Lindner, F. Barbon, S. Mann, G. Vinci, R. Weigel, and A. Koelpin, "Dual tone approach for unambiguous six-port based interferometric distance measurements" in IEEE MTT-S International Microwave Symposium, 2013, pp. 1-4. [Bibtex]
    @inproceedings{lindner2013,
    author  = {Lindner, Stefan and Barbon, Francesco and Mann, Sebastian and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    title  = {Dual tone approach for unambiguous six-port based interferometric distance measurements},
    booktitle  = {{IEEE MTT-S International Microwave Symposium}},
    year  = {2013},
    month  = {06},
    pages  = {1--4},
    issn  = {0149-645X},
    doi  = {10.1109/MWSYM.2013.6697581},
    location  = {Seatlle, WA, USA},
    publisher  = {IEEE},
    keywords  = {distance measurement,radar interferometry,;absolute position determination},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1408},
    abstract  = {This publication shows an approach for absolute, unambiguous distance measurements with a Six-Port radar at 24 GHz. Such an interferometric radar has the drawback of ambiguity problem concerning phase, limiting the measuring distance to half of the used wavelength. This can be solved with the presented dual tone system using the resulting beat frequency between two tones to determine an absolute position within even several wavelengths. In the following, this system will be presented along with simulations and measurements proving the concept.},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Essel, C. Hsieh, G. Fischer, and R. Weigel, "Measurement of Backscatter RFID-Transponders" in 14th IEEE International Workshop on Signal Processing Advances in Wireless Communications, 2013, pp. 485-489. [Bibtex]
    @inproceedings{ussmueller2013a,
    author  = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Hsieh, Chia-Yu and Fischer, Georg and Weigel, Robert},
    title  = {Measurement of Backscatter RFID-Transponders},
    booktitle  = {{14th IEEE International Workshop on Signal Processing Advances in Wireless Communications}},
    year  = {2013},
    month  = {06},
    pages  = {485--489},
    issn  = {1948-3244},
    doi  = {10.1109/SPAWC.2013.6612097},
    location  = {Darmstadt},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1274},
    }
  • [DOI] C. Carlowitz, A. Eßwein, R. Weigel, and M. Vossiek, "Regenerative Sampling Self-Mixing Receiver: A Novel Concept For Low Complexity Phase Demodulation" in IEEE MTT-S International Symposium Digest (IMS), 2013, pp. 1-4. [Bibtex]
    @inproceedings{carlowitz2013,
    author  = {Carlowitz, Christian and Eßwein, Alexander and Weigel, Robert and Vossiek, Martin},
    title  = {Regenerative Sampling Self-Mixing Receiver: A Novel Concept For Low Complexity Phase Demodulation},
    booktitle  = {{IEEE MTT-S International Symposium Digest (IMS)}},
    year  = {2013},
    month  = {06},
    day  = {04},
    pages  = {1--4},
    issn  = {0149-645X},
    doi  = {10.1109/MWSYM.2013.6697569},
    location  = {Seattle, WA},
    keywords  = {demodulation,differential phase shift keying,error statistics,injection locked oscillators,low noise amplifiers,microwave receivers,phase locked loops,low noise amplifier,signal sampling,regenerated signal},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1303},
    abstract  = {In this paper, a novel low complexity receiver concept for high-order differential phase demodulation is introduced for the first time. With a first hardware demonstrator, a high data rate of 300 Mbit/s is achieved without requiring a synthesizer for downconversion. A phase sensitive regenerative sampling approach is employed that integrates both low noise amplifier and automatic gain control using a free running switched injection-locked oscillator with no need for stabilization by a phase locked loop. Differential phase detection is achieved by quadrature self-mixing the regenerated signal with one path delayed by the symbol period. This approach is particularly attractive in combination with the switched injection-locked oscillator due to its constant high output power that allows for matching the mixer's best operating point. The proposed concept is demonstrated at 5.5 GHz with 8th order differential phase shift keying and a symbol rate of 100 MBaud/s. A short range data rate of 300 Mbit/s is achieved at a bit error rate below 1e-3.},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A Compact Analog Active Time delay Line using SiGe BiCMOS Technology" in IEEE International Symposium on Circuits and Systems, 2013. [Bibtex]
    @inproceedings{hamouda2013a,
    author  = {Hamouda, Mohammed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Compact Analog Active Time delay Line using SiGe BiCMOS Technology},
    booktitle  = {{IEEE International Symposium on Circuits and Systems}},
    year  = {2013},
    month  = {05},
    doi  = {10.1109/ISCAS.2013.6572031},
    location  = {Beijing, China},
    keywords  = {ultra wide band,delay,m-sequence},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1019},
    abstract  = {This work discusses the design of a 60ps delay element for UWB analog signals ranging from 0.05 up to 7.5GHz. The design is implemented using BJT transistors which have the advantage of being very compact in area compared to the passive architectures. The proposed architecture is flexible and can be cascaded to have delay upto 210ps with 3dB insertion loss. The circuit is designed using low cost 0.25μm 95GHz fmax SiGe-HBTBiCMOS process technology consuming a power of 121mW. The estimated consumed area of the circuit is 560μm x 870μm.},
    }
  • [DOI] F. Oesterle, F. Fink, A. Dehe, H. Kuhn, R. Weigel, and A. Koelpin, "A Large Deflection Model of Silicon Membranes for Testing Intrinsic Stress of MEMS Microphones by Measuring Pull-In Voltage" in SPIE Microtechnologies, Smart Sensors, Actuators, and MEMS VI, Conference 8763, 2013. [Bibtex]
    @inproceedings{oesterle2013c,
    author  = {Oesterle, Florian and Fink, Franz and Dehe, Alfons and Kuhn, Harald and Weigel, Robert and Koelpin, Alexander},
    title  = {A Large Deflection Model of Silicon Membranes for Testing Intrinsic Stress of MEMS Microphones by Measuring Pull-In Voltage},
    booktitle  = {{SPIE Microtechnologies, Smart Sensors, Actuators, and MEMS VI, Conference 8763}},
    year  = {2013},
    month  = {05},
    day  = {17},
    doi  = {10.1117/12.2016835},
    location  = {Grenoble, France},
    publisher  = {SPIE},
    keywords  = {Inspection equipment,Manufacturing,Microelectromechanical systems,Silicon},
    volume  = {8763},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1080},
    abstract  = {Mechanical parameters, especially mechanical stress of membranes used in silicon microphones strongly depend on the manufacturing process. As a result, deviations during this process can result in sensitivity variations of the microphone. Therefore, the stress should be well controlled within a certain tensile level. This paper describes a method to test devices electrically using the MEMS related pull-in phenomenon with respect to the mechanical compliance of microphone membranes. Using this method, out of specification chips can be detected at an early stage within the manufacturing process instead of determination at a system functionality test after packaging. Therefore, the adequacy for the intended use of the pull-in voltage and its dependency on varying tensile stress due to manufacturing tolerance is evaluated.},
    }
  • U. Schwerthöffer, M. Winter, R. Weigel, and D. Kissinger, "Concentration detection in water-glucose mixtures for medical applications using ultrasonic velocity measurements" in IEEE Internation Symposium on Medical Measurement and Applications, 2013, pp. 175-178. [Bibtex]
    @inproceedings{schwerthoeffer2013,
    author  = {Schwerthöffer, Udo and Winter, M. and Weigel, Robert and Kissinger, Dietmar},
    title  = {Concentration detection in water-glucose mixtures for medical applications using ultrasonic velocity measurements},
    booktitle  = {{IEEE Internation Symposium on Medical Measurement and Applications}},
    year  = {2013},
    month  = {05},
    pages  = {175--178},
    location  = {Gatineau, Canada},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1159},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, R. Weigel, and D. Kissinger, "A 125-GHz permittivity sensor with read-out circuit in a 250-nm SiGe BiCMOS technology", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 5, pp. 2195-2204, 2013. [Bibtex]
    @article{laemmle2013a,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 125-GHz permittivity sensor with read-out circuit in a 250-nm SiGe BiCMOS technology},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2013},
    month  = {05},
    pages  = {2195--2204},
    issn  = {0018-9480},
    publisher  = {IEEE},
    volume  = {61},
    number  = {5},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1145},
    }
  • A. Koelpin, "Industrial Modal Analysis: Measuring Vibrations in Harsh Environments by Six-Port Technology" in Radar, Communication and Measurement (RADCOM), 2013. [Bibtex]
    @inproceedings{koelpin2013,
    author  = {Koelpin, Alexander},
    title  = {Industrial Modal Analysis: Measuring Vibrations in Harsh Environments by Six-Port Technology},
    booktitle  = {{Radar, Communication and Measurement (RADCOM)}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, Germany},
    publisher  = {GEROTRON COMMUNICATION GmbH},
    keywords  = {Six-Port,Vibration},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1429},
    }
  • R. Rudelsdorfer and M. Ortner, "Grosssignaleigenschaften (unter bes. Beachtung der Intermodulationsfestigkeit) empfindlicher RF-Schaltkreise und -Frontends" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{rudelsdorfer2013,
    author  = {Rudelsdorfer, R. and Ortner, M.},
    title  = {Grosssignaleigenschaften (unter bes. Beachtung der Intermodulationsfestigkeit) empfindlicher RF-Schaltkreise und -Frontends},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1591},
    }
  • L. Zimmermann, "Praesenzdetektion von Personen in Innenraeumen mittels CO2-Gassensorik" in RADCOM, 2013. [Bibtex]
    @inproceedings{zimmermann2013a,
    author  = {Zimmermann, Lars},
    title  = {Praesenzdetektion von Personen in Innenraeumen mittels CO2-Gassensorik},
    booktitle  = {{RADCOM}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1596},
    }
  • B. Dornberger, "Technologien integrierter Leistungsmosfets" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{dornberger2013,
    author  = {Dornberger, Barbara},
    title  = {Technologien integrierter Leistungsmosfets},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1593},
    }
  • M. Kuba, A. Oeder, K. Ronge, and R. Weigel, "Automatische Erkennung von Kommunikationsstandards im Sub-GHz-Bereich" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{kuba2013,
    author  = {Kuba, Matthias and Oeder, Andreas and Ronge, Karlheinz and Weigel, Robert},
    title  = {Automatische Erkennung von Kommunikationsstandards im Sub-GHz-Bereich},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1594},
    abstract  = {Fuer die drahtlose Kommunikation im Heimautomatisierungsbereich wird im europae- ischen Raum bevorzugt das lizenzfrei verfuegbare 868 MHz Short Range Device Band eingesetzt. Haeufig verwenden Geraete unterschiedlicher Hersteller jedoch verschiedene Kommunikationsstandards und sind somit nicht in der Lage, Daten untereinander auszutauschen. Eine Loesung für dieses Problem bietet ein Funkgateway, das die Datenpakete zwischen den einzelnen Standards uebersetzt. Ist dieses Gateway zudem in der Lage, den verwendeten Kommunikationsstandard eines empfangenen Signals automatisch zu erkennen und den Empfaenger adaptiv auf diesen anzupassen, so laesst sich universelle Interoperabilitaet zwischen verschiedenen Technologien erreichen. In diesem Vortrag wird ein solches automatisches Erkennungsverfahren fuer einige im 868 MHz Band häufig vorkommende Standards vorgestellt. Zunaechst werden die Details des mustererkennungsbasierten Algorithmus dargelegt. Hiernach werden die Ergebnisse sowohl der simulativen als auch der messtechnischen Verifikation praesentiert und es erfolgt ein Vergleich der Ergebnisse aus Simulation und Messung. Schließlich werden einige moegliche Anwendungsszenarien fuer das vorgestellte Verfahren beschrieben.},
    }
  • W. Wiesbeck, "Systemkonzepte fuer das Radar 2020" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{wiesbeck2013,
    author  = {Wiesbeck, Werner},
    title  = {Systemkonzepte fuer das Radar 2020},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1590},
    abstract  = {Die Radartechnik ist inzwischen fast 110 Jahre für die unterschiedlichsten Aufgaben und Anwendungen eingesetzt worden. In dieser Zeit hat sich die Systemtechnik des Radars den Innovationszyklen der Technologie und des Bedarfs angepasst. Typische Beispiele waren das Pulsradar oder Phased Array, um nur zwei zu nennen. In den nächs- ten Jahren ist ein nahe zu revolutionärer Technologiesprung in der Radartechnik zu er- warten. Die erforderlichen und sich geradezu aufdrängenden Technologien resultieren weitgehend aus der Kommunikationstechnik. Sie werden in die Radarsystemtechnik einfließen und vollkommen neue Möglichkeiten eröffnen. Im Einzelnen sind die zu erwartenden Systemideen: • Intelligente Signalcodierung • MIMO Radar • Digitale Strahlformung • Array Imaging • Kombination Radar x Kommunikation = RadCom},
    }
  • C. Blümm, A. Elefsiniotis, C. Heller, and R. Weigel, "Channel equalization for OFDM communication on a runtime-flexible SDR platform" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{bluemm2013,
    author  = {Blümm, Christian and Elefsiniotis, A. and Heller, Christoph and Weigel, Robert},
    title  = {Channel equalization for OFDM communication on a runtime-flexible SDR platform},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1589},
    abstract  = {Each communication system requires channel equalization to compensate systematic distortions resulting from propagation effects like multipath spread or Doppler shift. A major advantage of Orthogonal Frequency Division Multiplexing (OFDM) is the simplicity of channel equalization in frequency domain. The channel state information for adequate equalization can be gained by transmitting known signals, called pilot tones. The way of distributing those pilots among payload tones and the way of interpolating them is decisive for the equalization quality and must be matched to the channel characteristic. This study compares different pilot distributions and interpola- tion techniques and gives details of a runtime-flexible implementation on a self-desig- ned FPGA-based Software Defined Radio (SDR) platform.},
    }
  • A. Zohny, J. Rascher, R. Weigel, and T. Ußmüller, "A Comparison of State-of-the-Art Efficiency Enhancement Techniques of Fully Integrated CMOS Power Amplifiers for Handset LTE Applications" in International Conference on Wireless Information Technology and Systems, 2013. [Bibtex]
    @inproceedings{zohny2013,
    author  = {Zohny, Amr and Rascher, Jochen and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Comparison of State-of-the-Art Efficiency Enhancement Techniques of Fully Integrated CMOS Power Amplifiers for Handset LTE Applications},
    booktitle  = {{International Conference on Wireless Information Technology and Systems}},
    year  = {2013},
    month  = {04},
    location  = {Orlando, Florida},
    publisher  = {IEEE},
    keywords  = {Power amplifier,Power-added efficiency,linearity,CMOS,long-term evolution,peak-to-average power ration},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1066},
    abstract  = {Among the significant remaining challenges of complete transceiver integration for handset applications is the implementation of high-efficiency power amplifiers (PA) in CMOS. This challenge is exacerbated by the high crest factors of the signals utilized in WCDMA and LTE standards. The first aim of this paper is to identify the shortcomings of the traditional efficiency enhancement techniques in dealing with LTE in CMOS. In addition, an investigation of state-ofthe- art implemented efficiency enhancement methods is performed. Moreover, a comparative overview of the aforementioned techniques is presented to provide guidelines for high-efficiency CMOS LTE PA. This is accomplished while identifying the bottlenecks for the future LTE upgrades. Finally, the performances of the investigated techniques for CMOS are compared with other technologies to assay the commercial suitability of CMOS PA for LTE.},
    }
  • N. Franchi, G. Fischer, and R. Weigel, "Design von adaptiven Automobil-Funksystemen mittels Rapid-SDR-Prototyping" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{franchi2013a,
    author  = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    title  = {Design von adaptiven Automobil-Funksystemen mittels Rapid-SDR-Prototyping},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1588},
    abstract  = {In den kommenden Jahren wird die Einbindung drahtloser Technologien in unsere Fahrzeuge zunehmend an Bedeutung gewinnen. Dabei wird die informationstechni- sche Vernetzung des Automobils mit anderen Fahrzeugen, mit seiner Umgebung so- wie mit mobilen Endgeräten der Passagiere als neue Schlüsselkompetenz für zukünfti- ge Fahrzeugtechnik gesehen. Bisher werden in der Automobilindustrie zur Abbildung unterschiedlicher Kommunikationsstandards meist jeweils dedizierte Chiplösungen eingesetzt, deren Funktionen kaum dynamisch angepasst werden können. In diesem Beitrag wird daher ein modulares, Software-basiertes Prototyping-Konzept vorgestellt, mit dessen Hilfe der Entwurf und die Entwicklung von flexiblen Wireless Vehicular Com- munication Systems ermöglicht werden kann. Am Beispiel der automotive-relevanten Funkstandards IEEE 802.11b und IEEE 802.11p sollen anhand einer Prototypenumset- zung sowohl die Stärken des Prototyping-Konzeptes als auch einer SDR-basierten Rea- lisierungsform von Funksystemen im Fahrzeug verdeutlicht werden.},
    }
  • J. Brendel and A. Schmidt, "Embedded Systems zur dynamischen Frequenzplanung für drahtlose Mikrofone der Zukunft" in BICCnet Innovation Forum Smart Systems | Embedded, 2013. [Bibtex]
    @inproceedings{brendel2013,
    author  = {Brendel, Johannes and Schmidt, Axel},
    title  = {Embedded Systems zur dynamischen Frequenzplanung für drahtlose Mikrofone der Zukunft},
    booktitle  = {{BICCnet Innovation Forum Smart Systems | Embedded}},
    year  = {2013},
    month  = {04},
    day  = {18},
    location  = {Munich, Germany},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1073},
    abstract  = {Die für Systeme der drahtlosen Veranstaltungs- und Produktionsmittel, der Konferenztechnik, der elektronischen Berichterstattung (PMSE) und des Rundfunks nutzbaren Frequenzbereiche wurden in den letzten Jahren immer stärker reduziert: zunächst durch die Digitalisierung des Rundfunks, dann durch die daraus resultierende Digitale Dividende 1 und den damit zusammenhängenden Regulierungsentscheidungen. Zusätzlich stellen neue Nutzungskonzepte für das UHF-Spektrum, die mit einer weitergehenden Dynamisierung der Frequenznutzung einher gehen, die vom Kunden geforderte, hohe Betriebssicherheit von PMSE Anwendungen grundsätzlich in Frage und fordern neue Lösungen sowohl von Seiten der Regulierung als auch der PMSE Hersteller. Das hier vorgestellte, vom BMWi geförderte Projekt C-PMSE verfolgt die Realisierung einer Forschungs- und Validierungsplattform mit räumlich verteiltem Scanner- und Auswertesystem in Kombination mit neuen kognitiven Funktionalitäten als Testinstallation in einem Kongress-Zentrum, um Nachweise zur Machbarkeit und Tauglichkeit der verfolgten Lösungen zu erbringen.},
    }
  • R. Weigel, G. Fischer, M. Hofmann, and J. Nehring, "Design und Synthese breitbandiger Richtkoppler fuer die Vektorielle Netzwerkanalyse" in RADCOM 2013, 2013. [Bibtex]
    @inproceedings{weigel2013,
    author  = {Weigel, Robert and Fischer, Georg and Hofmann, Maximilian and Nehring, Johannes},
    title  = {Design und Synthese breitbandiger Richtkoppler fuer die Vektorielle Netzwerkanalyse},
    booktitle  = {{RADCOM 2013}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1592},
    abstract  = {In this paper a complete procedure for the design, synthesis and construction of wideband directional couplers is presented. Cascading multiple quarter-wavelength line segments leads to an increase of coupling bandwidth up to 180 \% but also results in discontinuities of geometry and thus in strong reflections. Furthermore, the isolation is diminished. To avoid these effects a design technique for the generation of continous, nonuniform geometries is analyzed and implemented. Two methods for the coupler synthesis are proposed and compared. One is an approximational approach and uses two sets of equations. The other uses accurate 2D field simulation of the propagating modes and is universally applicable to any kind of coupled transmission lines. The completely synthesized couplers are simulated in CST Microwave Studio and achieve very good results for coupling, isolation and return loss. A nominal -10 dB wideband coupler at a center frequency of 15 GHz and a nominal bandwidth of 164 \% is built in a multilayer stackup. Good agreement between measurement and simulation results is observed.},
    }
  • A. Talai, R. Weigel, and A. Koelpin, "Electromagnetic Field Analysis of Porosified LTCC" in Computer Simulation Technology - European User Conference 2013, 2013, pp. 1-9. [Bibtex]
    @inproceedings{talai2013,
    author  = {Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    title  = {Electromagnetic Field Analysis of Porosified LTCC},
    booktitle  = {{Computer Simulation Technology - European User Conference 2013}},
    year  = {2013},
    month  = {04},
    day  = {24},
    pages  = {1--9},
    location  = {Stuttgart, Germany},
    publisher  = {CST Computer Simulation Technology AG},
    url  = {https://www.cst.com/Content/Events/downloads/euc2013/3-1-3_CST_EUC.pdf},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1095},
    }
  • [DOI] J. Rascher, A. Zohny, S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "A Comparative Overview of High Power Handling CMOS Switches and their Recent Applications in RF Front-Ends" in IEEE Wireless and Microwave Technology Conference, 2013. [Bibtex]
    @inproceedings{rascher2013,
    author  = {Rascher, Jochen and Zohny, Amr and Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Comparative Overview of High Power Handling CMOS Switches and their Recent Applications in RF Front-Ends},
    booktitle  = {{IEEE Wireless and Microwave Technology Conference}},
    year  = {2013},
    month  = {04},
    doi  = {10.1109/WAMICON.2013.6572754},
    location  = {Orlando, Florida, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1046},
    abstract  = {In this publication techniques for high power handling capability (PHC) of RF switches in bulk CMOS are investigated and compared. Together with high isolation approaches these allow reconfigurable power amplifiers (PAs) or radio front-ends for Watt level communication standards. Special care is taken to assess the applicability of the solutions for monolithic integration in scaled CMOS processes. Results are shown with PHC as high as 34dBm in a 32nm CMOS process. Recent applications for the switches in front-ends or reconfigurable PAs are analyzed. They show large DC current reduction in back-off with stage bypassing and load adaptation concepts. Up to 50\% DC current reduction for low output power is reported. This greatly improves the average PA efficiency for varying envelope signals without the efforts of more advanced solutions like envelope tracking.},
    }
  • L. Zimmermann, "Aktivitaets- und Sturzdetektion von Personen am Handgelenk" in RADCOM, 2013. [Bibtex]
    @inproceedings{zimmermann2013,
    author  = {Zimmermann, Lars},
    title  = {Aktivitaets- und Sturzdetektion von Personen am Handgelenk},
    booktitle  = {{RADCOM}},
    year  = {2013},
    month  = {04},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1595},
    }
  • M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Design of an Ultra-Wideband Monocone Circular Antenna Array for Vehicle-Integrated Industrial Local Positioning Applications" in European Conference on Antennas and Propagation, 2013. [Bibtex]
    @inproceedings{gardill2013c,
    author  = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Design of an Ultra-Wideband Monocone Circular Antenna Array for Vehicle-Integrated Industrial Local Positioning Applications},
    booktitle  = {{European Conference on Antennas and Propagation}},
    year  = {2013},
    month  = {04},
    location  = {Gothenburg, Sweden},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1010},
    abstract  = {We present the design of a vehicle-roof-integrated wideband circular antenna array for industrial local positioning applications. The array is designed for Direction-of-Arrival estimation in a novel ultra-wideband secondary FMCW radar system operating in the 5 GHz - 8 GHz frequency range. A novel size-reduced, mechanically robust, and application-ready monocone antenna with more than 120 \% impedance bandwidth is proposed as basis element for array design, which allows for arbitrary array geometries based on a =2 grid spacing. We show measurement results and the characterization of a four-element circular array.},
    }
  • M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Receiving Mode CST MWS – Matlab Co-Simulations for Time and Frequency Domain UWB Small Antenna Array Characterization" in CST European User Group Meeting 2013, 2013. [Bibtex]
    @inproceedings{gardill2013d,
    author  = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Receiving Mode CST MWS – Matlab Co-Simulations for Time and Frequency Domain UWB Small Antenna Array Characterization},
    booktitle  = {{CST European User Group Meeting 2013}},
    year  = {2013},
    month  = {04},
    day  = {24},
    location  = {Stuttgart, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1011},
    abstract  = {Using current simulation technology the simulation setup for a small antenna array (no Unit-Cell approach) generally is as follows: the complete antenna array structure is modeled in CST MWS and a port is assigned to each antenna element. The simulation can then be performed by either exciting a single element only while all others are terminated with their port reference impedance, which would e.g. yield the active element pattern, the embedded element impedance, and the TX mode element coupling S-Parameters. Alternatively the simulation can be performed using a simultaneous excitation of all ports, with a predefined phase and amplitude distribution. This yields the pattern of the complete array for the defined excitations as well as the scan impedance for every element. However, both approaches lead to a description of the antenna array in transmit mode only, but it is a well-known fact that the TX mode characteristics differ from the RX mode characteristics significantly. In our contribution we propose a Matlab – CST Co simulation framework for simulating antenna arrays in receive mode. Therefore, we developed a Matlab function which excites the complete structure using plane waves impinging on the array from various directions of interest, records the output signals of all ports as well as the Plane wave signal (using ResultReaderDLL) and finally postprocesses the outputs to get state-of-the-art frequency and time-domain characteristics for UWB antennas and antenna arrays. In the presentation we give an introduction to the problem of UWB receiving antenna array characterization, we introduce the state-of-the-art frequency and time-domain figures of merit for UWB antennas and antenna arrays, we introduce our simulation framework, and we discuss simulation results. The simulation framework Matlab code will be available to interested users for free.},
    }
  • S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "Modelling and Simulation of the Energy Efficiency of Heterogeneous Integrated Systems at System Level" in 13. ITG/GMM-Fachtagung Analog 2013, 2013, pp. 1-6. [Bibtex]
    @inproceedings{glock2013a,
    author  = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Modelling and Simulation of the Energy Efficiency of Heterogeneous Integrated Systems at System Level},
    booktitle  = {{13. ITG/GMM-Fachtagung Analog 2013}},
    year  = {2013},
    month  = {03},
    day  = {04},
    pages  = {1--6},
    location  = {Aachen, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1177},
    abstract  = {In recent years, the minimization of the power dissipation of integrated heterogeneous systems has become one of the most important design goals. At specification level, at which not all architectural decisions have been taken, exists the highest potential to minimize the power dissipation of the whole system. However, the high complexity of modern het-erogeneous systems complicates the estimation of the power dissipation. Especially the analysis of the power dissipa-tion beyond subsystems is challenging because it necessitates the joint simulation of analogue and digital subsystems. In this context, the question of the right abstraction level for the joint evaluation is demanding because analogue system design follows the bottom-up paradigm, whereas digital system design follows the top-down paradigm. This paper pro-poses a new methodology to model the power dissipation and energy efficiency of complex heterogeneous systems at specification level. The method is based on the hardware description language SystemC. The methodology enables ear-ly power estimation of complete heterogeneous systems. The performance of the modelling approach is shown exem-plarily on an RF-receiver of a mobile radio platform. Those platforms are both battery driven and portable. Therefore, low power consumption is of utmost importance with respect to the later success of the product.},
    }
  • M. Maser, G. Fischer, R. Weigel, and T. Ußmüller, "Ein integrierter SiGe Bipolar VCO mit linearisierter Abstimmkennlinie und großem Abstimmbereich für UWB FMCW Nahbereichsortung" in Analog 2013, 2013. [Bibtex]
    @inproceedings{maser2013,
    author  = {Maser, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Ein integrierter SiGe Bipolar VCO mit linearisierter Abstimmkennlinie und großem Abstimmbereich für UWB FMCW Nahbereichsortung},
    booktitle  = {{Analog 2013}},
    year  = {2013},
    month  = {03},
    day  = {05},
    location  = {Aachen, Germany},
    publisher  = {VDE Verlag GmbH},
    keywords  = {UWB,Local Positioning,VCO,Tuning Linearization},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1054},
    abstract  = {Dieser Artikel beschreibt einen integrierten, spannungsgesteuerten Oszillator (engl.: voltage controlled oscillator, VCO) mit linearisierter Abstimmkennlinie für Ultrabreitbandnahbereichsortungsradaranwendungen. Der VCO ist LC-Resonator basiert. Um einen ultrabreiten, kontinuierlichen Frequenzabstimmbereich (engl.: frequency tuning range, FTR) zu erzielen, verwendet der VCO eine Negativinduktivität-Zelle (engl.: negative inductance cell, NIZelle) in Verbindung mit einem differentiellen pn-Varaktor. Durch die Kopplung der beiden Abstimmmechanismen wird eine konstantere Abstimmsensitivität (KVCO) erreicht. Der vorgestellte VCO weist einen gemessenen FTR von fmin = 3,365GHz bis fmax = 7,677GHz auf. Die Abstimmkennlinie ist in einem kontinuierlichen Frequenzbereich von 2,1GHz linearisiert, was einem relativen FTR von 34\% entspricht. Die gemessene KVCO-Abweichung beträgt nur +/-10\% um KVCO = 775 MHz/V.},
    }
  • [DOI] S. Heinen, R. Wunderlich, M. Robens, J. Sachs, M. Kmec, R. Weigel, T. Ußmüller, B. Sewiolo, M. Hamouda, R. Kraemer, C. Scheytt, and Y. Borokhovych, "HaLoS - Integrated RF-Hardware Components for Ultra-Wideband Localization and Sensing," in Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications, R. Thomä, Ed., Intech, 2013, pp. 369-438. [Bibtex]
    @inbook{heinen2013,
    author  = {Heinen, Stefan and Wunderlich, Ralf and Robens, Markus and Sachs, Jürgen and Kmec, Martin and Weigel, Robert and Ußmüller, Thomas and Sewiolo, Benjamin and Hamouda, Mohammed and Kraemer, Rolf and Scheytt, Christoph and Borokhovych, Yevgen},
    editor  = {Thomä, Reiner},
    title  = {HaLoS - Integrated RF-Hardware Components for Ultra-Wideband Localization and Sensing},
    booktitle  = {{Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications}},
    year  = {2013},
    month  = {03},
    day  = {13},
    pages  = {369--438},
    doi  = {10.5772/54987},
    publisher  = {Intech},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1275},
    }
  • [DOI] G. Vinci, S. Lindner, F. Barbon, S. Mann, M. Hofmann, A. Duda, R. Weigel, and A. Koelpin, "Six-Port Radar Sensor for Remote Respiration Rate and Heartbeat Vital-Sign Monitoring", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 5, pp. 2093-2100, 2013. [Bibtex]
    @article{vinci2013,
    author  = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Mann, Sebastian and Hofmann, Maximilian and Duda, Alexander and Weigel, Robert and Koelpin, Alexander},
    title  = {Six-Port Radar Sensor for Remote Respiration Rate and Heartbeat Vital-Sign Monitoring},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2013},
    month  = {03},
    day  = {07},
    pages  = {2093--2100},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2013.2247055},
    publisher  = {IEEE},
    keywords  = {radars,radar systems,bio effects and med. appl. of RF/Microwave,biomedical applications,biomedical sensors},
    volume  = {61},
    number  = {5},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1295},
    abstract  = {A novel remote respiration and heartbeat monitoring sensor is presented. The device is a monostatic radar based on a six-port interferometer operating a continuous-wave signal at 24 GHz and a radiated power of less than 3 μW . Minor mechanical movements of the patient's body caused by the respiration as well as heartbeat can be tracked by analyzing the phase modulation of the backscattered signal by means of microwave interferometry with the six-port network. High-distance measurement accuracy in the micrometer scale as well as low system complexity are the benefits of the six-port receiver. To verify the performance of the system, different body areas have been observed by the six-port radar. The proposed system has been tested and validated by measurement results.},
    }
  • M. Rantisi and S. Sattler, "Histogram on the Track" in ANALOG'13 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2013. [Bibtex]
    @inproceedings{rantisi2013,
    author  = {Rantisi, Mohammed and Sattler, Sebastian},
    title  = {Histogram on the Track},
    booktitle  = {{ANALOG'13 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2013},
    month  = {03},
    location  = {Aachen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1552},
    }
  • T. Ußmüller, "Ortbare Multistandard RFID-Tags mit Sensor-Interface" in ANALOG'13 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2013. [Bibtex]
    @inproceedings{ussmueller2013,
    author  = {Ußmüller, Thomas},
    title  = {Ortbare Multistandard RFID-Tags mit Sensor-Interface},
    booktitle  = {{ANALOG'13 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2013},
    month  = {03},
    location  = {Aachen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1551},
    }
  • M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Receiving Mode Simulations for Ultra-Wideband Characterization of Small Antenna Arrays and a Novel Look on Mutual Coupling" in Applied Computational Electromagnetics Society Conference, 2013. [Bibtex]
    @inproceedings{gardill2013b,
    author  = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Receiving Mode Simulations for Ultra-Wideband Characterization of Small Antenna Arrays and a Novel Look on Mutual Coupling},
    booktitle  = {{Applied Computational Electromagnetics Society Conference}},
    year  = {2013},
    month  = {03},
    location  = {Monterey, CA, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1021},
    abstract  = {Using conventional commercially available computational electromagnetics (CEM) simulation packages the simulation setup for a small antenna array generally is as follows: the complete antenna array structure is modeled in the simulation tool and the simulation is sequentially performed by exciting each single antenna element while all others are terminated with their port reference impedance. This yields a complete characterization of the array in transmit (TX) mode. However, it is a well-known fact that the TX mode characteristics differ from the receive (RX) mode characteristics significantly and the results obtained from a TX mode simulation do not necessarily capture the RX case. In this contribution we first propose an extended model for characterizing RX mode ultra-wideband (UWB) antenna-arrays, with a novel look on the RX mode coupling phenomena. Based on the theory, we propose our computational framework for accurate simulations of small receiving UWB antenna arrays. We further present simulation results for some exemplary UWB antenna arrays and discuss our novel viewpoint on RX mode array coupling.},
    }
  • [DOI] C. Musolff, M. Kamper, Z. Abou-Chahine, and G. Fischer, "A linear and efficient Doherty PA at 3,5GHz", IEEE Microwave Magazine, vol. 14, iss. 1, pp. 95-101, 2013. [Bibtex]
    @article{musolff2013,
    author  = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid and Fischer, Georg},
    title  = {A linear and efficient Doherty PA at 3,5GHz},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2013},
    month  = {02},
    pages  = {95--101},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2012.2226998},
    publisher  = {IEEE},
    keywords  = {power amplifier,Doherty,load modulation,linearity,IMD,cancellation,3,5GHz,efficiency,backoff,twotone,harmonic balance},
    volume  = {14},
    number  = {1},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1100},
    }
  • [DOI] M. Hofmann, G. Fischer, R. Weigel, and D. Kissinger, "Microwave-Based Noninvasive Concentration Measurements for Biomedical Applications", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 5, pp. 2195-2204, 2013. [Bibtex]
    @article{hofmann2013b,
    author  = {Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Microwave-Based Noninvasive Concentration Measurements for Biomedical Applications},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2013},
    month  = {02},
    day  = {19},
    pages  = {2195--2204},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2013.2250516},
    publisher  = {IEEE},
    volume  = {61},
    number  = {5},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1089},
    abstract  = {A Debye relaxation model for the permittivity of aqueous glucose solution is given up to 40GHz. Measurements of aqueous solutions are compared with invasive measurements on over 40 blood samples. Reflection and transmission based techniques are explained, concerning the application in biomedical concentration measurements. Wideband measurements on different sensing structures are introduced. Reflection and transmission based sensors are applied to a six-port reflectometer as well as a homodyne vector network analyzer (VNA).},
    }
  • [DOI] A. Eßwein, R. Weigel, C. Carlowitz, and M. Vossiek, "Concepts and Components for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems," in Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications, 1 ed., R. Thomä, R. Knöchel, J. Sachs, I. Willms, and T. Zwick, Eds., Intech, 2013, pp. 343-368. [Bibtex]
    @inbook{esswein2013,
    author  = {Eßwein, Alexander and Weigel, Robert and Carlowitz, Christian and Vossiek, Martin},
    editor  = {Thomä, Reiner and Knöchel, Reinhard and Sachs, Jürgen and Willms, Ingolf and Zwick, Thomas},
    title  = {Concepts and Components for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems},
    booktitle  = {{Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications}},
    year  = {2013},
    month  = {02},
    pages  = {343--368},
    isbn  = {978-953-51-0936-5},
    doi  = {10.5772/2648},
    publisher  = {Intech},
    keywords  = {Ultra Wideband},
    url  = {http://www.intechopen.com/books/ultra-wideband-radio-technologies-for-communications-localization-and-sensor-applications},
    edition  = {1},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1053},
    abstract  = {Ultra-Wideband Radio (UWB) earmarks a new radio access philosophy and exploits several GHz of bandwidth. It promises high data rate communication over short distances as well as innovative radar sensing and localization applications with unprecedented resolution. Fields of application may be found, among others, in industry, civil engineering, surveillance and exploration, for security and safety measures, and even for medicine. The book considers the basics and algorithms as well as hardware and application issues in the field of UWB radio technology for communications, localization and sensing based on the outcome of DFG's priority-funding program "Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications (UKoLoS)".},
    }
  • N. Franchi, F. Spiteller, and R. Weigel, "Automotive meets Adaptive Wireless Communication" in 4. GMM-Fachtagung Automotive meets Electronics (AmE), 2013. [Bibtex]
    @inproceedings{franchi2013,
    author  = {Franchi, Norman and Spiteller, Florian and Weigel, Robert},
    title  = {Automotive meets Adaptive Wireless Communication},
    booktitle  = {{4. GMM-Fachtagung Automotive meets Electronics (AmE)}},
    year  = {2013},
    month  = {02},
    day  = {20},
    location  = {Dortmund, Germany},
    publisher  = {VDE-Verlag},
    keywords  = {Software Defined Radio,Wireless Vehicular Communication Systems,Rapid-SDR-Prototyping,IEEE 802.11p,IEEE 802.11b,USRP},
    url  = {www.vde-verlag.de/proceedings-de/453485028.html},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1075},
    abstract  = {Die Einbindung drahtloser Technologien in Fahrzeuge wird in den kommenden Jahren zunehmend an Bedeutung gewinnen. Die Vernetzung des Automobils mit mobilen Endgeräten der Passagiere sowie mit anderen Fahrzeugen und der Umwelt wird dabei als neue Schlüsselkompetenz für zukünftige Fahrzeugtechnik gesehen. In der Automotive-Branche werden bisher meist dedizierte Systeme mit integrierten Chiplösungen eingesetzt, deren Funktionen kaum dynamisch angepasst werden können. In diesem Beitrag wird daher ein modulares Konzept vorgestellt, das auf dem Software-Defined-Radio-Prinzip aufsetzt und großes Potential für die Entwicklung adaptiver und kosteneffizienter Umsetzungsformen von sog. Wireless Vehicular Communication Systems bietet. Mit Hilfe der exemplarischen Umsetzung eines neuartigen Prototyping-Ansatzes werden – am Beispiel der beiden automotive-relevanten Funkstandards IEEE 802.11bTM und IEEE 802.11pTM – sowohl die Stärken des Ansatzes selbst als auch der SDR-basierten Realisierungsform von flexiblen Funksystemen verdeutlicht.},
    }
  • J. Essel, D. Brenk, J. Heidrich, R. Weigel, and D. Kissinger, "Large-signal measurements and non-linear characterization of an analog frontend for passive UHF CMOS RFID transponders", IEEE Transactions on Microwave Theory and Techniques, vol. 61, iss. 2, pp. 948-959, 2013. [Bibtex]
    @article{essel2013,
    author  = {Essel, Jochen and Brenk, Daniel and Heidrich, Jürgen and Weigel, Robert and Kissinger, Dietmar},
    title  = {Large-signal measurements and non-linear characterization of an analog frontend for passive UHF CMOS RFID transponders},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2013},
    month  = {02},
    pages  = {948--959},
    issn  = {0018-9480},
    publisher  = {IEEE},
    volume  = {61},
    number  = {2},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1144},
    }
  • D. Kissinger, B. Lämmle, I. Nasr, and R. Weigel, "Millimeter-wave integrated reflectometer architectures for biomedical applications (invited)" in IEEE Topical Conference on Biomedical Wireless Technologies, Networks and Sensing Systems, 2013, pp. 1-3. [Bibtex]
    @inproceedings{kissinger2013,
    author  = {Kissinger, Dietmar and Lämmle, Benjamin and Nasr, Ismail and Weigel, Robert},
    title  = {Millimeter-wave integrated reflectometer architectures for biomedical applications (invited)},
    booktitle  = {{IEEE Topical Conference on Biomedical Wireless Technologies, Networks and Sensing Systems}},
    year  = {2013},
    month  = {01},
    pages  = {1--3},
    location  = {Austin, TX},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1158},
    }
  • B. Lämmle, K. Schmalz, J. Borngraeber, C. Scheytt, R. Weigel, A. Koelpin, and D. Kissinger, "A fully integrated 120-GHz six-port receiver front-end in a 130-nm SiGe BiCMOS technology" in 2013 IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, 2013, pp. 129-131. [Bibtex]
    @inproceedings{laemmle2013,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Borngraeber, J. and Scheytt, Christoph and Weigel, Robert and Koelpin, Alexander and Kissinger, Dietmar},
    title  = {A fully integrated 120-GHz six-port receiver front-end in a 130-nm SiGe BiCMOS technology},
    booktitle  = {{2013 IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems}},
    year  = {2013},
    month  = {01},
    day  = {21},
    pages  = {129--131},
    location  = {Austin, TX, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1055},
    abstract  = {A fully integrated six-port receiver front-end at 120 GHz center frequency including a low-noise-amplifier, a passive six-port network, a VCO, and four direct converters is presented in this publication. The overall architecture of the designed six-port receiver is analyzed and fundamental theory of the receiver given. The design of the six-port building blocks is described and measurement results are presented. All circuits have been fabricated in a 0.13μm 300-GHz fT SiGe BiCMOS technology. The fully integrated receiver consumes 85.9 rnA from a 3.3-V supply and occupies an area of 1.03mm2. The receiver includes a VCO with a center frequency of 117.15 GHz, a tuning range of 2.7 GHz, and a phase noise of -86 dBc/Hz at 1 MHz offset. The LNA shows a gain of 12 dB, a 3-dB bandwidth of 30 GHz at a power consumption of 9.2 rnA. The six-port core has a conversion gain of 3.6 dB, a P1dB of -12 dBm, and a power consumption of 28 rnA. The overall receiver shows a conversion gain of 2.4 dB at 120 GHz and P1dB of -17 dBm.},
    }
  • [DOI] W. Bakalski, A. Thomas, and R. Weigel, "A fully integrated bulk-CMOS switch based tunable transformer for RF and antenna matching" in IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2013, 2013, pp. 142-144. [Bibtex]
    @inproceedings{bakalski2013,
    author  = {Bakalski, Winfried and Thomas, Anthony and Weigel, Robert},
    title  = {A fully integrated bulk-CMOS switch based tunable transformer for RF and antenna matching},
    booktitle  = {{IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2013}},
    year  = {2013},
    month  = {01},
    day  = {20},
    pages  = {142--144},
    doi  = {10.1109/PAWR.2013.6490216},
    location  = {Santa Clara, CA},
    keywords  = {CMOS integrated circuits,UHF antennas,UHF integrated circuits,impedance matching,microwave switches,transformer windings,GSM band,Infineon bulk-CMOS RF switch process},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1323},
    abstract  = {A fully integrated tunable RF impedance matching network based on a transformer topology and on-chip RF switches is presented. Using the Infineon 130 nm Bulk-CMOS RF switch process with 2.4 μm alumina top metal, the chip integrates a 4-bit digitally tunable capacitor, a planar transformer with 4 independent windings and 12 taps, an on-chip charge pump and RF switches to control the operating mode of capacitor and the transformer. The circuit offers the possibility to cover the Smith Chart at either low and high impedance up to a VSWR of 10 on the GSM band 790-960 MHz. In by-pass mode the insertion loss is 0.8 dB at 850 MHz and features a harmonic generation of - 85 dBc (H2) and -75 dBc (H3) without the need of any external devices or extra controller. The current consumption at 1.5 V is 120 μA.},
    }
  • [DOI] A. Farabegoli, B. Sogl, J. Müller, and R. Weigel, "A novel, fast, and precise Method to perform Time Alignment Estimation and Compensation" in IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2013, 2013, pp. 28-30. [Bibtex]
    @inproceedings{farabegoli2013,
    author  = {Farabegoli, Alessio and Sogl, Bernhard and Müller, Jan-Erik and Weigel, Robert},
    title  = {A novel, fast, and precise Method to perform Time Alignment Estimation and Compensation},
    booktitle  = {{IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2013}},
    year  = {2013},
    month  = {01},
    day  = {20},
    pages  = {28--30},
    doi  = {10.1109/PAWR.2013.6490178},
    location  = {Santa Clara, CA},
    keywords  = {power amplifiers,cross-correlation,fractional delay mismatch estimation,mobile application,modular approach,power amplifier,reduced sampling rate,time alignment compensation},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1322},
    abstract  = {In this paper, a novel procedure to estimate and compensate the delay between power amplifier's input and output waveforms is described. The proposed method has been developed in order to achieve fast computation and simple implementation that are required in state of the art mobile applications. In addition, the modular approach adopted offers high flexibility and enables further future improvements. Comparison with a traditional method like cross-correlation shows up to four times faster estimation time with the same precision. Resolution is furthermore improved estimating the fractional delay mismatch to increase the precision of the results with reduced sampling rate of the signals.},
    }
  • [DOI] M. Hofmann, A. Oborovski, R. Weigel, G. Fischer, and D. Kissinger, "A Microwave VNA for Biomedical In-line Concentration Measurements" in BioWireless Conference, 2013. [Bibtex]
    @inproceedings{hofmann2013a,
    author  = {Hofmann, Maximilian and Oborovski, Andreas and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Microwave VNA for Biomedical In-line Concentration Measurements},
    booktitle  = {{BioWireless Conference}},
    year  = {2013},
    month  = {01},
    doi  = {10.1109/BioWireleSS.2013.6613670},
    location  = {Austin, TX},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1093},
    abstract  = {This paper presents a microwave (MW) test-set designed for biomedical in-line concentration measurements. The demonstrator consists of a commercial voltage controlled oscillator (VCO) with an output power of up to +12.0 dBm, feeding an asymmetric 4 way power divider. A fraction of 0 dBm of the VCO output is driving three I-Q mixers, which realizes a homodyne vector network analyzer. Dual directional couplers were investigated concerning the application for concentration measurements. A wiggly line coupler was separately fabricated and measured as well as implemented in the demonstrator. The entire system is fabricated, calibrated and subsequently characterized with a transmission based permittivity sensor.},
    }
  • [DOI] A. Hartmann, R. Strzoda, R. Schrobenhauser, and R. Weigel, "Extending the applicability of the Arndt formula in wavelength modulation spectroscopy for absorbance in the lower percent range", Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 133, pp. 619-623, 2013. [Bibtex]
    @article{hartmann2013,
    author  = {Hartmann, Alexander and Strzoda, Rainer and Schrobenhauser, Robert and Weigel, Robert},
    title  = {Extending the applicability of the Arndt formula in wavelength modulation spectroscopy for absorbance in the lower percent range},
    journal  = {{Journal of Quantitative Spectroscopy and Radiative Transfer}},
    year  = {2013},
    pages  = {619--623},
    issn  = {0022-4073},
    doi  = {10.1016/j.jqsrt.2013.09.026},
    publisher  = {Pergamon Press},
    volume  = {133},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1127},
    }
  • [DOI] S. Glock, B. Sogl, P. Vizaretta, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "An Extension of Power Amplifier Behavioral Models for Optimizing Battery Current at System Level" in IEEE Radio and Wireless Week (RWW 2013), 2013. [Bibtex]
    @inproceedings{glock2013,
    author  = {Glock, Stefan and Sogl, Bernhard and Vizaretta, P. and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {An Extension of Power Amplifier Behavioral Models for Optimizing Battery Current at System Level},
    booktitle  = {{IEEE Radio and Wireless Week (RWW 2013)}},
    year  = {2013},
    doi  = {10.1109/PAWR.2013.6490191},
    location  = {Austin, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/998},
    abstract  = {One of the most significant figures of merit concerning a power amplifier is its effficiency. However, behavioral models of power amplifiers are mainly focused on functional aspects but not on current consumption. Therefore, simulations with respect to the efficiency of a power amplifier cannot be accomplished at system level. To close the gap of simulation capabilities, this article proposes a time efficient and accurate extension of behavioral models to predict current consumption. The current consumption model accounts for different bias conditions. For a commercial handset power amplifier, an average error of 1.9\% between the fast highlevel model and measurement results is obtained.},
    }
  • [DOI] M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Single-Element Based Ultra-Wideband Antenna Array Concepts for Wireless High-Precision 2D Local Positioning", Advances in Radio Science, 2013. [Bibtex]
    @article{gardill2013,
    author  = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Single-Element Based Ultra-Wideband Antenna Array Concepts for Wireless High-Precision 2D Local Positioning},
    journal  = {{Advances in Radio Science}},
    year  = {2013},
    issn  = {1684-9965},
    doi  = {10.5194/ars-11-297-2013},
    publisher  = {Copernicus},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1051},
    abstract  = {We generally categorize the approaches for ultrawideband antenna array design, and consequently propose simplified concepts for antenna arrays for a high-precision, ultra-wideband FMCW radar 2D local positioning system to obtain robustness against multi path interference, perform angle of arrival analysis, as well as instantaneous heading estimation. We focus on low-cost and mechanical robust, industrial-application ready antennas. The antenna arrays are optimized for operation in the 5 GHz to 8 GHz frequency range and are designed towards supporting full omnidirectional 360 as well as partial half-plane direction of arrival estimation. Two different concepts for vehicle- as well as wall-mounted antenna array systems are proposed and discussed. We propose a wideband unidirectional bow-tie antenna array element having 97\% impedance and 37\% pattern bandwidth and a robust vehicle mounted omnidirectional antenna element having more than 85\% impedance and pattern bandwidth.},
    }
  • [DOI] M. Gardill, G. Fischer, R. Weigel, and A. Koelpin, "Design of a Robust and Low-Cost Monocone Antenna Element for Use in Vehicle Roof-Mounted Antenna Arrays" in IEEE Radio and Wireless Week, 2013. [Bibtex]
    @inproceedings{gardill2013a,
    author  = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Design of a Robust and Low-Cost Monocone Antenna Element for Use in Vehicle Roof-Mounted Antenna Arrays},
    booktitle  = {{IEEE Radio and Wireless Week}},
    year  = {2013},
    doi  = {10.1109/RWS.2013.6486658},
    location  = {Austin, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/997},
    abstract  = {We present the design of a wideband monocone antenna element having more than one octave impedance as well as pattern bandwidth. It is optimized for use in vehicle roof-mounted antenna arrays for spatial processing in an ultra-wideband local positioning secondary radar system, operating in the frequency range from 5 GHz to 8 GHz. We focus on a low-cost design, offering mechanical robustness, being ruggedized towards environmental influence, and achieving small physical dimensions using a protective dielectric-encapsulated design. In addition, we suggest a solderless and robust interconnection between coaxial connector and antenna element. The antenna element allows for arbitrary planar array geometries with grid spacing at the order of the lowest frequency of operation and a simple integration in any vehicle with a metallic roof.},
    }
  • M. Hofmann, "Breitbandige Netzwerkanalyse auf Basis einer Sechstor-Topologie im Frequenzbereich zwischen 3 GHz und 30 GHz" in RadCom, 2013. [Bibtex]
    @inproceedings{hofmann2013,
    author  = {Hofmann, Maximilian},
    title  = {Breitbandige Netzwerkanalyse auf Basis einer Sechstor-Topologie im Frequenzbereich zwischen 3 GHz und 30 GHz},
    booktitle  = {{RadCom}},
    year  = {2013},
    location  = {Hamburg},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1091},
    abstract  = {Mit Hilfe einer Sechstor-Topologie lassen sich die Beträge und Phasenlagen zweier einfallender Wellen vergleichen und quantifizieren. Dies impliziert die Eignung einer Sechstor-Topologie zur vektoriellen Netzwerk-Analyse. Durch den Einsatz von breitbandigen Kopplern und Leistungsteilern (f_max/f_min > 9) lässt sich diese Architektur verwenden um eine Zweitor-Netzwerkanalyse im Frequenzbereich von 3 bis 30 GHz durchzuführen. Schaltungsentwurf, Feldsimulation und Messung wird im Rahmen des Vortrags vorgestellt.},
    }
  • J. Chicharro, R. Weigel, G. Fischer, and T. Ußmüller, "Low Impedance Multi-Decade Integrated Amplifier for EMR Measurements in Fully Electric Vehicles" in Asia-Pacific International Symposium and Exhibition on Electromagnetic Compatibility, 2013. [Bibtex]
    @inproceedings{chicharro2013,
    author  = {Chicharro, José and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    title  = {Low Impedance Multi-Decade Integrated Amplifier for EMR Measurements in Fully Electric Vehicles},
    booktitle  = {{Asia-Pacific International Symposium and Exhibition on Electromagnetic Compatibility}},
    year  = {2013},
    location  = {Melbourne, Australia},
    keywords  = {Bipolar,Integrated circuits,broadband amplifier,low-impedance LNA,EMR measurements,multi-decade},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1058},
    abstract  = {This paper reports on the design, simulation and measurement of a low-impedance broadband integrated amplifier in bipolar technology (Infineon’s B7HF200). Aimed to serve as a LNA for an inductive field probe operating in the frequency range 5 kHz - 6 GHz, the amplifier is designed to offer a good performance with a purely resistive 10-Ohm power source. A nominal gain of 30 dB up to 1 GHz (15 dB at 6 GHz) and and input scattering parameter s11 of -10 decibels are achieved. Power consumption is 30 mW. Limitations of and improvements for this design are discussed.},
    }
  • [DOI] M. Jung, G. Fischer, R. Weigel, and T. Ußmüller, "Low Power 24 GHz ad hoc Networking System Based on TDOA for Indoor Localization", ISPRS International Journal of Geo-Information, pp. 1122-1135, 2013. [Bibtex]
    @article{jung2013,
    author  = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Low Power 24 GHz ad hoc Networking System Based on TDOA for Indoor Localization},
    journal  = {{ISPRS International Journal of Geo-Information}},
    year  = {2013},
    pages  = {1122--1135},
    issn  = {2220-9964},
    doi  = {10.3390/ijgi2041122||10.3390/ijgi2041122},
    publisher  = {MDPI AG},
    keywords  = {fmcw,tdoa,ad hoc networking,pll,synthesizer,tspc,frequency divider},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1587},
    abstract  = {This paper introduces the key elements of a novel low-power, high precision localization system based on Time-Difference-of-Arrival (TDOA) distance measurements. The combination of multiple localizable sensor nodes, leads to an ad hoc network. Besides the localization functionality this ad hoc network has the additional advantage of a communication interface. Due to this a flexible positioning of the master station for information collection and the detection of static and mobile nodes is possible. These sensor nodes work in the 24 GHz ISM (Industrial Scientific and Medical) frequency range and address several use cases and are able to improve various processes for production scheduling, logistics, quality management, medical applications and collection of geo information. The whole system design is explained briefly. Its core component is the frequency modulated continuous wave (FMCW) synthesizer suitable for high performance indoor localization. This research work focuses on power and size reduction of this crucial system component. The comparison of the first and second generation of the system shows a significant size and power reduction as well as an increased precision.},
    }
  • [DOI] F. Oesterle, R. Weigel, and A. Koelpin, "A New Approach on MEMS Sensor Batch Testing Using an Analogue Parallel Test Methodology for Massive Reduction of Test Time" in IEEE Sensors 2013, 2013, pp. 1-4. [Bibtex]
    @inproceedings{oesterle2013b,
    author  = {Oesterle, Florian and Weigel, Robert and Koelpin, Alexander},
    title  = {A New Approach on MEMS Sensor Batch Testing Using an Analogue Parallel Test Methodology for Massive Reduction of Test Time},
    booktitle  = {{IEEE Sensors 2013}},
    year  = {2013},
    pages  = {1--4},
    doi  = {10.1109/ICSENS.2013.6688626},
    location  = {Baltimore, USA},
    keywords  = {MEMS,Parallel Testing,Mechanical Sensitivity,Pull-In,Microphone,Tomographic Reconstruction},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1109},
    abstract  = {With a tremendous shipment increase of MEMS microphones during the last few years, enhanced testing methods have become a key issue for industrial batch manufacturing, focusing on the mechanical sensitivity of the sound transducing diaphragm. Instead of semi-parallel techniques, in which test channels and measurement equipment are duplicated (with a multiplication of invest) for the purpose of further reduction of test time, this paper shows a novel approach for a massive parallel test of MEMS sensors. With several DUTs connected in parallel, the resulting measurements hence reveal several overlain device characteristics, each accounting for the sensitivity of one single DUT. For the specific correlation of those characteristics to each DUT, a reconstruction method known from tomography imaging techniques is adapted. The measurement results on wafer level shown in this paper exhibit the basic suitability of a single test of several DUTs in parallel and prove the concept of this novel method},
    }
  • M. Pour Mousavi, M. Wojnowski, S. Roehr, G. Sommer, and R. Weigel, "The impact of embedded wafer level BGA package on the antenna hemispherical lens characterization for wireless applications at 61 GHz" in European Conference of Antennas and Propagation (EuCAP), 2013. [Bibtex]
    @inproceedings{pourmousavi2013,
    author  = {Pour Mousavi, Mehran and Wojnowski, Maciej and Roehr, S. and Sommer, Grit and Weigel, Robert},
    title  = {The impact of embedded wafer level BGA package on the antenna hemispherical lens characterization for wireless applications at 61 GHz},
    booktitle  = {{European Conference of Antennas and Propagation (EuCAP)}},
    year  = {2013},
    location  = {Sweden},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1113},
    }
  • [DOI] R. Schnabel, R. Hellinger, D. Steinbuch, J. Sellinger, M. Klar, and B. Lucas, "Development of a mid range automotive radar sensor for future driver assistance systems", International Journal of Microwave and Wireless Technologies, vol. 5, pp. 15-23, 2013. [Bibtex]
    @article{schnabel2013,
    author  = {Schnabel, Raik and Hellinger, R. and Steinbuch, Dirk and Sellinger, J. and Klar, M. and Lucas, B.},
    title  = {Development of a mid range automotive radar sensor for future driver assistance systems},
    journal  = {{International Journal of Microwave and Wireless Technologies}},
    year  = {2013},
    pages  = {15--23},
    issn  = {1759-0787},
    doi  = {10.1017/S17 590787 120007 24},
    publisher  = {Cambridge University Press},
    keywords  = {Radar Architecture and Systems,Antenna Design,Modeling and Measurement},
    volume  = {5},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1579},
    abstract  = {Radar sensors are key components of modern driver assistance systems. The application of such systems in urban environments for safety applications is the primary goal of the project “Radar on Chip for Cars” (RoCC). Major outcomes of this project will be presented and discussed in this contribution. These outcomes include the specification of radar sensors for future driver assistance systems, radar concepts, and integration technologies for silicon-germanium (SiGe) MMICs, as well as the development and evaluation of a system demonstrator. A radar architecture utilizing planar antennas and highly integrated components will be proposed and discussed with respect to system specifications. The developed system demonstrator will be evaluated in terms of key parameters such as field of view, distance, and angular separability. Finally, as an outlook a new mid range radar (MRR) will be introduced incorporating several concepts and technologies developed in this project.},
    }
  • F. Oesterle, M. Gardill, R. Weigel, and A. Koelpin, "Evaluation of a Microwave Based Contact-Free Testing Method for Mechanical Sensitivity Analysis of MEMS for Inline Integration of On-Wafer Measurements" in IEEE European Microwave Week (EuMW), 2013. [Bibtex]
    @inproceedings{oesterle2013a,
    author  = {Oesterle, Florian and Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    title  = {Evaluation of a Microwave Based Contact-Free Testing Method for Mechanical Sensitivity Analysis of MEMS for Inline Integration of On-Wafer Measurements},
    booktitle  = {{IEEE European Microwave Week (EuMW)}},
    year  = {2013},
    location  = {Nuremberg, Germany},
    keywords  = {MEMS,Mechanical Resonance,Mechanical Sensitivity,Contactless Testing,Microwave Reflectometry,Deflection Measurement,W-band,Microphone,Inline Integration},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1082},
    abstract  = {Testing of Micro Electro Mechanical Systems is a key issue in high volume batch manufacturing. Deviating process parameters influence the nominal intrinsic stress level of the mechanical components, leading to a variation of the specified sensitivity, hence the system functionality. Focusing on a short test time, inline integration, and contactless excitation and analysis methods, establishing an electrical test for the required sensitivity within the mechanical domain is challenging. Depending on the design and functionality of the specific MEMS device, optical interferometry methods, Impedance or Network Analyzers or even final system level tests are implemented nowadays. This paper presents an alternative contactless testing method for sensitivity analysis of MEMS using microwave reflectometry. Proving the enormous potential of the method for inline integration, measurement results for varying chuck thickness and frequencies within the W-band are shown and evaluated, using a dedicated test setup for on-chip or on-wafer measurements.},
    }
  • F. Oesterle, G. Vinci, R. Weigel, and A. Koelpin, "A Novel, W-Band Microwave Based Contactless Test Method for Mechanical Sensitivity Analysis of MEMS" in IEEE International Microwave Symposium, 2013. [Bibtex]
    @inproceedings{oesterle2013,
    author  = {Oesterle, Florian and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    title  = {A Novel, W-Band Microwave Based Contactless Test Method for Mechanical Sensitivity Analysis of MEMS},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2013},
    location  = {Seattle, USA},
    keywords  = {Microelectromechanical Systems,Contactless Testing,Microphones,Mechanical Sensitivity,Microwave Interferometry,W-band},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1081},
    abstract  = {The desired functionality of Micro Electro Mechanical Systems (MEMS) suffers from the influence on the nominal stress level of the mechanical components, e.g. by deviating manufacturing process parameters. Therefore, appropriate methods for testing mechanical parameters of MEMS is a key issue. The focus is on contactless techniques, short measurement time, accurate repeatability, and inline integration in manufacturing environments for mass production. Depending on the configuration of the device components, a couple of methods, such as optical interferometry, electrical impedance measurements and system level sensitivity tests are nowadays in use. This article presents a novel method for contactless testing of mechanical sensitivity of MEMS devices based on W-band microwave interferometry. Results of measurements at 90GHz are shown. The excellent detection of the test parameter verifies the feasibility and enormous potential of this proposed method.},
    }
  • S. Mann, G. Vinci, S. Lindner, F. Barbon, S. Linz, R. Weigel, and A. Koelpin, "Improved Dual Six-Port Receiver Structure for Two-Dimensional Direction of Arrival Detection Using pHEMT Power Detectors" in IEEE European Radar Conference 2013 (EuRAD), 2013. [Bibtex]
    @inproceedings{mann2013,
    author  = {Mann, Sebastian and Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    title  = {Improved Dual Six-Port Receiver Structure for Two-Dimensional Direction of Arrival Detection Using pHEMT Power Detectors},
    booktitle  = {{IEEE European Radar Conference 2013 (EuRAD)}},
    year  = {2013},
    location  = {Nuremberg, Germany},
    publisher  = {IEEE},
    keywords  = {Six-Port,Direction-Of-Arrival,Phase measurement,Power Detector,pHEMT},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1098},
    abstract  = {Abstract—Two-dimensional Direction Of Arrival detection (DOA) of an arbitrary electromagnetic wave is a challenging task, especially if high accuracy has to be performed. The proposed DOA receiver is based on a phase detector using the interferometric Six-Port principle. For the proposed system an improved power detector concept using a High Electron Mobility Transistor has been developed featuring strictly square law behaviour to at least -15 dBm. Thus, the system offers a high dynamic range of more than 40 dB. The hereby presented system concept additionally has a switched delay line phase shifter for frequency estimation of the incoming electromagnetic wave. Moreover, the most important system components have been validated by measurements.},
    }
  • [DOI] S. Mann, G. Vinci, S. Lindner, S. Linz, F. Barbon, R. Weigel, and A. Koelpin, "61 GHz Six-Port Radar Frontend for High Accuracy Range Detection Applications" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications 2013, 2013, pp. 818-821. [Bibtex]
    @inproceedings{mann2013a,
    author  = {Mann, Sebastian and Vinci, Gabor and Lindner, Stefan and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {61 GHz Six-Port Radar Frontend for High Accuracy Range Detection Applications},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications 2013}},
    year  = {2013},
    pages  = {818--821},
    doi  = {10.1109/APWC.2013.6624910},
    location  = {Torino, Italy},
    keywords  = {Six-Port,Radar Coupler},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1099},
    abstract  = {Abstract — Range detection is an challenging task, especially if high accuracy has to be reached. The hereby proposed 61GHz continuous wave radar system is based on a phase detector using Six-Port technique. For accuracy enhancement an improved isolation radar coupler has been introduced for broadband frequency modulated continuous wave radar as well as narrow band radar techniques. Furthermore, a Six-Port network based on four hybrid couplers is presented. Finally, the most important system subcomponents have been validated by measurements.},
    }
  • J. Nehring, I. Nasr, G. Fischer, R. Weigel, and D. Kissinger, "A Single-Chip 15-32 GHz Signal Source in SiGe Bipolar Technology" in European Microwave Integrated Circuits Conference (EuMic), 2013. [Bibtex]
    @inproceedings{nehring2013,
    author  = {Nehring, Johannes and Nasr, Ismail and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Single-Chip 15-32 GHz Signal Source in SiGe Bipolar Technology},
    booktitle  = {{European Microwave Integrated Circuits Conference (EuMic)}},
    year  = {2013},
    location  = {Nuremberg, Germany},
    keywords  = {VCO,signal source,wideband,microwave,octave-wide bandwidth},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1043},
    abstract  = {This paper presents a single-chip octave-bandwidth signal source covering a frequency band from 15GHz to 32GHz. The circuit was fabricated in a 0.35 μm SiGe bipolar technology with an ft/fmax = 170/250GHz. An array of four crosscoupled voltage controlled oscillators with subsequent frequency ranges is implemented. The oscillator cores only draw 13mA from a 3.3V supply. Another 13mA is drawn by following buffer stages. A 4-to-1 multiplexing amplifier acts as a combiner providing the octave-wide bandwidth at a single differential output. The output power was measured to be between -2.5 dBm and 0.7 dBm. The signal source provides a good phase noise performance of -105 dBc/Hz at 15GHz and -96.8 dBc/Hz at 30GHz at an offset of 100MHz from the carrier frequencies. The overall circuit consumes a total power of 205mW and occupies a chip area of 1128 μm x 1028 μm.},
    }
  • [DOI] A. Chakraborty, S. Trotta, and R. Weigel, "A low-phase-noise monolithically integrated 60 GHz push-push VCO for 122 applications in a SiGe Bipolar technology" in IEEE Bipolar/BiCMOS Technology Meeting, 2013, pp. 195-198. [Bibtex]
    @inproceedings{chakraborty2013,
    author  = {Chakraborty, Abhiram and Trotta, Saverio and Weigel, Robert},
    title  = {A low-phase-noise monolithically integrated 60 GHz push-push VCO for 122 applications in a SiGe Bipolar technology},
    booktitle  = {{IEEE Bipolar/BiCMOS Technology Meeting}},
    year  = {2013},
    pages  = {195--198},
    doi  = {10.1109/BCTM.2013.6798174},
    location  = {France},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1121},
    }

2012

  • [DOI] E. Seler, M. Wojnowski, G. Sommer, and R. Weigel, "Comparative Analysis of High-Frequency Transitions in Embedded Wafer Level BGA (eWLB) and Quad Flat no Leads (VQFN) Packages" in IEEE 14th Electronics Packaging Technology Conference (EPTC), 2012, pp. 99-102. [Bibtex]
    @inproceedings{seler2012,
    author  = {Seler, Ernst and Wojnowski, Maciej and Sommer, Grit and Weigel, Robert},
    title  = {Comparative Analysis of High-Frequency Transitions in Embedded Wafer Level BGA (eWLB) and Quad Flat no Leads (VQFN) Packages},
    booktitle  = {{IEEE 14th Electronics Packaging Technology Conference (EPTC)}},
    year  = {2012},
    month  = {12},
    pages  = {99--102},
    doi  = {10.1109/EPTC.2012.6507059},
    location  = {Singapore, SG},
    keywords  = {ball grid arrays,wafer level packaging,HF-performance,I-O density,VQFN packages,chip-package-board transition,eWLB package,embedded wafer level BGA,electrical performance},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1307},
    abstract  = {Embedded Wafer Level Ball Grid Array (eWLB) is one of the most advantageous packaging technologies with respect to higher I/O density, process easiness, integration flexibilities and electrical performance. When it comes to high-frequency (HF), the latter has to be considered particularly. The Quad Flat no Leads Package (VQFN) has often been the choice due to good HF-performance. We present the comparison of the two package technologies eWLB and VQFN. In this paper we present an optimized 24 GHz chip-package-board transition. We compare the performance of an eWLB package to a VQFN package. We focus on a single-ended transition. We obtain a simulated insertion loss better than -0.5 dB in eWLB compared to -1.5 dB in VQFN. In this contribution we show the outstanding potential of the eWLB package for mm-wave applications.},
    }
  • L. Maurer, C. Ruppel, R. Weigel, and R. Vazny, "Future of SAW/BAW Devices in Mobile Radio" in International Symposium on Acoustic Wave Devices, 2012, pp. 61-64. [Bibtex]
    @inproceedings{maurer2012,
    author  = {Maurer, Linus and Ruppel, Clemens and Weigel, Robert and Vazny, Rastislav},
    title  = {Future of SAW/BAW Devices in Mobile Radio},
    booktitle  = {{International Symposium on Acoustic Wave Devices}},
    year  = {2012},
    month  = {12},
    pages  = {61--64},
    location  = {Chiba, JP},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1581},
    abstract  = {The popularity of smart-phones has established EDGE/WCDMA/HSPA connectivity as de-facto minimum requirement with respect to cellular standards. This in turn has increased the pressure to lower costs on the Radio-Frequency Front-End (RFFE)setup.To reduce the complexity and to minimize costs and PCB area, the removal of the external inter-stage SAW and/or BAW filters in the receiver (Rx) and transmitter (Tx) front-end (FE) has become a mandatory feature of state-of-the-art full-duplex capable cellular radios in recent years[1].Furthermore, external SAW/BAW filters are an obstacle on the path to a fully configurable RFFE.This article gives a brief overview on recent developments with respect to the distribution of SAW/BAW filters in the RFFE and tries to elucidate the impact of LTE on the future RFFE partitioning.},
    }
  • [DOI] M. Kuba, K. Ronge, and R. Weigel, "Development and Implementation of a Feature-Based Automatic Classification Algorithm for Communication Standards in the 868 MHz Band" in IEEE Global Communications Conference (GLOBECOM), 2012, 2012, pp. 3104-3109. [Bibtex]
    @inproceedings{kuba2012a,
    author  = {Kuba, Matthias and Ronge, Karlheinz and Weigel, Robert},
    title  = {Development and Implementation of a Feature-Based Automatic Classification Algorithm for Communication Standards in the 868 MHz Band},
    booktitle  = {{IEEE Global Communications Conference (GLOBECOM), 2012}},
    year  = {2012},
    month  = {12},
    pages  = {3104--3109},
    issn  = {1930-529X},
    doi  = {10.1109/GLOCOM.2012.6503591},
    location  = {Anaheim, CA},
    keywords  = {Monte Carlo methods,error statistics,feature extraction,pattern classification,software radio,statistical analysis,home automation applications,software defined radio platform},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1321},
    abstract  = {Wireless communication systems used for home automation applications in Europe suffer from the recurring standardization problem. Devices from different manufacturers often use different and incompatible protocol waveforms for communication. In this paper, we present the development and the implementation of a feature-based automatic classification algorithm for communication standards that are commonly used in the European 868 MHz short range device (SRD) frequency band, that can help to overcome this problem. The received signal is initially preprocessed and then fed to a feature extraction unit that calculates statistical parameters from the signal. Those features are then used by a classifier that is based on a simple binary decision tree. The performance of the algorithm is verified via Monte-Carlo simulation and compared to the bit error rates of the considered communication standards as a function of the signal-to-noise ratio. Finally, the algorithm is implemented in a software defined radio (SDR) platform and the measurement results are compared to the simulation-based success rates.},
    }
  • [DOI] A. Zohny, S. Leuschner, M. Kastner, J. Rascher, T. Ußmüller, J. Müller, G. Fischer, and R. Weigel, "Time-Efficient Adjacent Channel Power Ratio Simulation utilizing Overlap-add Signal Decomposition for UMTS Power Amplifiers" in Asia-Pacific Microwave Conference - APMC 2012, 2012. [Bibtex]
    @inproceedings{zohny2012b,
    author  = {Zohny, Amr and Leuschner, Stephan and Kastner, M. and Rascher, Jochen and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {Time-Efficient Adjacent Channel Power Ratio Simulation utilizing Overlap-add Signal Decomposition for UMTS Power Amplifiers},
    booktitle  = {{Asia-Pacific Microwave Conference - APMC 2012}},
    year  = {2012},
    month  = {12},
    day  = {6},
    doi  = {10.1109/APMC.2012.6421641},
    location  = {Kaohsiung, Taiwan},
    publisher  = {IEEE},
    keywords  = {Power Amplifier,Linearity,ACPR,WCDMA,Distortion,Harmonic Balance},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1041},
    abstract  = {The suitability of an RF power amplifier (PA) for modern sophisticated modulation schemes demands high linearity. One of the most significant figures of merit concerning PA linearity is its adjacent channel power ratio (ACPR). The aim of this paper is to propose a time-efficient simulation procedure for ACPR which conforms with the latest 3GPP TS 25.101 specifications for its calculation. This procedure overcomes the time penalty associated with the traditional envelope-based simulation method. The approach is based on standard harmonic balance (HB) tools with MATLAB post-processing incorporating the Overlap-add (OLA) signal decomposition DSP technique for fast RRC filtering. In addition, the simulation results are compared with measurements of a commercial WCDMA PA for verification. Accuracies of better than 0.5dB and 1.1dB are achieved up to 10dB and 2dB backoff respectively.},
    }
  • [DOI] M. Hofmann, J. Edelmann, R. Weigel, G. Fischer, and D. Kissinger, "Depth and Rate of the Save", IEEE Microwave Magazine, vol. 13, iss. 7, pp. 14-21, 2012. [Bibtex]
    @article{hofmann2012f,
    author  = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Depth and Rate of the Save},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2012},
    month  = {12},
    pages  = {14--21},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2012.2216707},
    publisher  = {IEEE},
    volume  = {13},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1092},
    abstract  = {Sudden cardiac arrest (SCA) is one of the leading causes of death worldwide. Studies have shown that roughly 90\% of all patients suffering from SCAs die due to ventricular fibrillation. This phenomenon is best described as an electrical chaos in the myocardium leading to fast but at the same time very short movements of the muscle. This results in a total collapse of the blood circulation and after 3–5 min, the death of gray matter. Without any external help, this will lead to death. In the United States, for instance, 325,000 people are affected each year. It is indisputable that the quality of a cardiopulmonary resuscitation (CPR) can make the difference between life and death. In 2010, the European Resuscitation Council (ERC) as well as the American Heart Association (AHA) submitted official guidelines for resuscitation. According to the ERC and further research results, the basilife support can be significantly improved by a feedback system. The recommendation for CPR feedback systems has subsequently been adopted by the German Medical Association (GMA). A CPR feedback system gives a response to the first aider about the quality of the resuscitation (compression depth and rate).},
    }
  • [DOI] A. Stöckle, J. Brendel, S. Rieß, R. Rose, and G. Fischer, "A low cost ultra-wide-band inverted F-Antenna for Cognitive PMSE systems" in International Conference on Wireless Information Technology and Systems, 2012, pp. 1-4. [Bibtex]
    @inproceedings{stoeckle2012,
    author  = {Stöckle, Andreas and Brendel, Johannes and Rieß, Steffen and Rose, Richard and Fischer, Georg},
    title  = {A low cost ultra-wide-band inverted F-Antenna for Cognitive PMSE systems},
    booktitle  = {{International Conference on Wireless Information Technology and Systems}},
    year  = {2012},
    month  = {11},
    pages  = {1--4},
    isbn  = {978-1-4673-0947-9},
    doi  = {10.1109/ICWITS.2012.6417833},
    location  = {Maui, Hawaii},
    publisher  = {IEEE},
    keywords  = {UWB,IFA,self-complementary,UHF,ultra-wide-band,scanning antenna,SCA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1003},
    }
  • J. Brendel and S. Rieß, "Realization of the Scanning Subsystem" in Öffentlicher Workshop des C-PMSE Projekts, 2012. [Bibtex]
    @inproceedings{brendel2012c,
    author  = {Brendel, Johannes and Rieß, Steffen},
    title  = {Realization of the Scanning Subsystem},
    booktitle  = {{Öffentlicher Workshop des C-PMSE Projekts}},
    year  = {2012},
    month  = {11},
    day  = {15},
    location  = {Hannover, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1096},
    }
  • [DOI] S. Schröter, R. Weigel, and G. Fischer, "Beamsteering for the Uplink of UMTS using Transmit Power Control Bits to iteratively determine the Antenna Weights" in IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012, 2012. [Bibtex]
    @inproceedings{schroeter2012a,
    author  = {Schröter, Simon and Weigel, Robert and Fischer, Georg},
    title  = {Beamsteering for the Uplink of UMTS using Transmit Power Control Bits to iteratively determine the Antenna Weights},
    booktitle  = {{IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012}},
    year  = {2012},
    month  = {11},
    doi  = {10.1109/ICWITS.2012.6417806},
    location  = {Maui, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1018},
    }
  • [DOI] G. Vinci, S. Lindner, F. Barbon, R. Weigel, and A. Koelpin, "Promise of a Better Position", IEEE Microwave Magazine, vol. 13, iss. 7, pp. 41-49, 2012. [Bibtex]
    @article{vinci2012g,
    author  = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {Promise of a Better Position},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2012},
    month  = {11},
    pages  = {41--49},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2012.2216710},
    publisher  = {IEEE},
    keywords  = {Automation,Displacement measurement,Feedback,Industrial plants,Machinery,Position measurement,Robot sensing systems,Sensors,Tracking,Six-Port},
    volume  = {13},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1035},
    abstract  = {Industrial automation today is an essential technology underlying our modern society. Advanced positioning and sensor feedback tasks in automation processes often require distance displacement detection, e.g., to measure and track the movement of robots. Furthermore, the detection of mechanical stress in complex industrial machinery through an accurate vibration analysis is often a task of major interest. Therefore, high-resolution distance measurements with short- and long-range positioning are important for a large number of sensing applications and can also be used as a precondition for vibrometer applications. Several automation technologies rely on high precision positioning sensors to track linear as well as rotational movements of various machinery.},
    }
  • [DOI] A. Zohny, J. Rascher, G. Fischer, R. Weigel, and T. Ußmüller, "A Classification and Comparative Overview of State-of-the-Art Analog Linearization Techniques for Integrated CMOS Power Amplifiers" in IEEE International Conference on Wireless Information Technology and Systems - ICWITS 2012, 2012. [Bibtex]
    @inproceedings{zohny2012a,
    author  = {Zohny, Amr and Rascher, Jochen and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Classification and Comparative Overview of State-of-the-Art Analog Linearization Techniques for Integrated CMOS Power Amplifiers},
    booktitle  = {{IEEE International Conference on Wireless Information Technology and Systems - ICWITS 2012}},
    year  = {2012},
    month  = {11},
    day  = {12},
    doi  = {10.1109/ICWITS.2012.6417770},
    location  = {Hawaii, USA},
    publisher  = {IEEE},
    keywords  = {Power Amplifier,Linearity,PAE,CMOS,Predistortion},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1042},
    abstract  = {In order to conform to the latest mobile communication standards, highly-linear power amplifiers (PA) are required. This is a challenge since high power added efficiency (PAE) is also needed for long battery life which dictates operating close to saturation where amplitude and phase nonlinearities are dominant. Thus linearization is necessary to simultaneously improve average efficiency and linearity [1]. Traditional linearization techniques such as feedback and feedforward suffer from bandwidth limitations and efficiency degradation respectively. Furthermore, digital predistortion (DPD) techniques are integrable albeit suffering from high system complexity [2]. State-of-the-art analog linearization techniques however solve many of these problems. The aim of this paper is to propose a classification of these techniques as shown in section II. In addition, section III shows a comparative overview of these techniques. Utilizing that classification and comparative study, the proper deep submicron (DSM) CMOS on-chip linearization techniques for handsets are then identified for modern communication standards.},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Essel, J. Heidrich, G. Fischer, and R. Weigel, "Roundtrip-Time-of-Flight Based Localization of Passive Multi-Standard RFID-Tags" in IEEE International Conference on Wireless Information Technologies and Systems, 2012. [Bibtex]
    @inproceedings{ussmueller2012a,
    author  = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    title  = {Roundtrip-Time-of-Flight Based Localization of Passive Multi-Standard RFID-Tags},
    booktitle  = {{IEEE International Conference on Wireless Information Technologies and Systems}},
    year  = {2012},
    month  = {11},
    doi  = {10.1109/ICWITS.2012.6417725},
    location  = {Wailea, HI},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1020},
    }
  • M. Jung, G. Fischer, R. Weigel, and T. Ußmüller, "A 10 GHz Low-Power Multi-Modulus Frequency Divider using Extended True Single-Phase Clock (E-TSPC) Logic" in The European Microwave Integrated Circuits Conference, 2012, pp. 508-511. [Bibtex]
    @inproceedings{jung2012a,
    author  = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A 10 GHz Low-Power Multi-Modulus Frequency Divider using Extended True Single-Phase Clock (E-TSPC) Logic},
    booktitle  = {{The European Microwave Integrated Circuits Conference}},
    year  = {2012},
    month  = {10},
    pages  = {508--511},
    isbn  = {978-2-87487-026-2},
    location  = {Amsterdam},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1279},
    }
  • [DOI] A. Ferizi, P. Baust, M. Jung, G. Fischer, R. Weigel, and A. Koelpin, "An area-efficient 130 nm CMOS baseband processing unit for 24 GHz FMCW radar positioning" in International Symposium on Signals, Systems, and Electronics (ISSSE), 2012, pp. 1-5. [Bibtex]
    @inproceedings{ferizi2012b,
    author  = {Ferizi, Alban and Baust, Philipp and Jung, Melanie and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {An area-efficient 130 nm CMOS baseband processing unit for 24 GHz FMCW radar positioning},
    booktitle  = {{International Symposium on Signals, Systems, and Electronics (ISSSE)}},
    year  = {2012},
    month  = {10},
    day  = {03},
    pages  = {1--5},
    issn  = {2161-0819},
    doi  = {10.1109/ISSSE.2012.6374292},
    location  = {Potsdam, Germany},
    publisher  = {IEEE},
    keywords  = {Application specific integrated circuits , Baseband , Hardware , Radar , Random access memory , Wireless communication , Wireless sensor networks},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1022},
    abstract  = {This paper presents an area-efficient digital implementation of a baseband processing unit (BPU) for autonomous wireless sensor nodes with localization functionality. The presented wireless nodes should achieve a high miniaturization degree and use an onboard FMCW secondary radar for distance measurements. The challenge for designing the digital system was to reduce memory requirements towards a low cost hardware design in general, and for an ASIC design in particular. Reducing chip area implies lower energy consumption and helps saving implementation and production costs. At the same time a qualitative performance of the digital signal processing tasks while keeping the system constraints has to be assured. The introduced novel hardware implementation concept fulfill these criteria, and has been implemented and verified on a FPGA before starting the chip design. For the use case of a two-sweep-measurement-system the design has been realized as an ASIC using IBM 130nm CMOS technology.},
    }
  • M. Kaiser, J. Hüttner, A. Ziroff, and R. Weigel, "A High Accurarcy Post-Synchronization Method for Secondary Radar Systems" in 9th European Radar Conference (EuRAD), 2012, pp. 262-265. [Bibtex]
    @inproceedings{kaiser2012,
    author  = {Kaiser, Markus and Hüttner, Jörg and Ziroff, Andreas and Weigel, Robert},
    title  = {A High Accurarcy Post-Synchronization Method for Secondary Radar Systems},
    booktitle  = {{9th European Radar Conference (EuRAD)}},
    year  = {2012},
    month  = {10},
    pages  = {262--265},
    isbn  = {978-1-4673-2471-7},
    location  = {Amsterdam, NL},
    keywords  = {compensation,frequency shift keying,millimetre wave radar,phase measurement,synchronisation,FSK-presynchronization,ISM band,compensation method,frequency 5.8 GHz,high accuracy post-synchronization method,localization system,round trip phase measurement,secondary radar system,Accuracy,Delay,Distance measurement,Frequency shift keying,Phase measurement,Radar,Synchronization},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6450618},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1268},
    abstract  = {A post-synchronization method for a localization system is presented here. The synchronization of independent secondary radar units of an active localization system is essential. There are different synchronization techniques. One of these is FSK-pre-synchronization, which is analysed in this paper. The precision of the pre-synchronization is not accurate enough for round trip phase measurement. The undesirable side-effects which distort the synchronization between the active radar units have been analysed and a compensation method developed. The radar units operate in the 5.8 GHz ISM band. To verify how accurately the novel post-synchronization method works a round trip phase measurement has been implemented. With the novel post-synchronization a ranging accuracy of 0.1824 cm is possible.},
    }
  • [DOI] S. Rieß, J. Brendel, A. Stöckle, R. Rose, and G. Fischer, "Concept of an UHF Band Receiver for Spectrum Sensing Applications" in IEEE International Symposium on Signals, Systems and Electronics, 2012. [Bibtex]
    @inproceedings{riess2012a,
    author  = {Rieß, Steffen and Brendel, Johannes and Stöckle, Andreas and Rose, Richard and Fischer, Georg},
    title  = {Concept of an UHF Band Receiver for Spectrum Sensing Applications},
    booktitle  = {{IEEE International Symposium on Signals, Systems and Electronics}},
    year  = {2012},
    month  = {10},
    doi  = {10.1109/ISSSE.2012.6374304},
    location  = {Potsdam, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1004},
    abstract  = {Spectrum sensing is a major part for the implementation of Cognitive Radio (CR) systems in order to enable dynamic access to the radio frequency spectrum. This paper describes a concept for a scanning receiver in the UHF band from 470–870 MHz. Characteristics and design considerations of an Analog and Digital Front-End are given as well as the implementation of a Baseband Processor. This is the central module of the whole receiver and the interface to a higher-level controlling unit connected through a 100 Mbit/s Ethernet link. The control interface for the receiver is similar to a spectrum analyzer and therefore easy integrable in an already existing system. Special attention in the digital part is paid to an IF subsampling approach and the clock generation circuit for the ADC. For the sake of completeness the interface to a configurable antenna and some details to the realization of the power supply are also described. This concept has been implemented in hardware in order to enable investigations for the task of spectrum sensing. Our scanning receiver is part of a complex CR system for Professional Wireless Microphone Systems (PWMS) which should be able to provide a dynamic frequency allocation of the connected radio links.},
    }
  • [DOI] A. Gharib, G. Fischer, R. Weigel, and D. Kissinger, "A broadband 1.33 THz GBP 120-mW common-collector feedback amplifier in SiGe technology" in IEEE Bipolar/BiCMOS Technology and Devices Meeting, 2012, pp. 72-75. [Bibtex]
    @inproceedings{gharib2012,
    author  = {Gharib, Ahmed and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A broadband 1.33 THz GBP 120-mW common-collector feedback amplifier in SiGe technology},
    booktitle  = {{IEEE Bipolar/BiCMOS Technology and Devices Meeting}},
    year  = {2012},
    month  = {10},
    pages  = {72--75},
    doi  = {10.1109/BCTM.2012.6352612},
    location  = {Portland, OR},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1157},
    }
  • T. Hofmann, M. Hertlein, and N. Uhlmann, "High dynamic range x-ray flux monitoring system" in Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE, 2012, pp. 1284-1286. [Bibtex]
    @inproceedings{hofmann2012g,
    author  = {Hofmann, Thomas and Hertlein, Markus and Uhlmann, Norman},
    title  = {High dynamic range x-ray flux monitoring system},
    booktitle  = {{Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE}},
    year  = {2012},
    month  = {10},
    day  = {27},
    pages  = {1284--1286},
    issn  = {1082-3654},
    location  = {Anaheim, CA},
    publisher  = {Development Center X-ray Technology EZRT at the Fraunhofer Institute for Integrated Circuits IIS, 90762 Fürth Germany},
    keywords  = {X-ray detection,X-ray scattering,calibration,computerised tomography},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1818},
    abstract  = {In this paper we present a mono pixel detector with a very high dynamic range for measuring the X-ray flux. The flux monitor system is mainly designed for supplementing and improving existing X-ray systems. When using such monitor devices additionally to other X-ray detectors, the monitor signal has to be calibrated versus the detector signal. A suitable calibration routine and its results are shown. The linearity (signal vs. dose) of the monitor was investigated and a highly linear behavior can be observed. In contrast to that, the used X-ray flat panel detector shows a larger non-linear behavior; therefor.e a non-linear calibration function has to be applied. The monitor was tested in typical computed tomography (CT) applications. Firstly we monitored the primary X-ray flux during a CT measurement close to the X-ray tube. This results in a very high dose rate, but has the benefit that the signal is not distorted by scattered radiation and that the whole detector area can be used for imaging (as e.g. in region-of-interest CT). We also monitored the scattered radiation during a CT measurement. In this case it is necessary to measure very low dose rates. The acquired measurements can be used to correct the projection data of the CT scan to improve CT quality.},
    }
  • [DOI] C. Heller, C. Blümm, S. Bouckaert, L. Wei, I. Moerman, P. van Wesemael, S. Pollin, T. Solc, and Z. Padrah, "Spectrum Sensing for Cognitive Wireless Applications Inside Aircraft Cabins" in IEEE Digital Avionics Systems Conference, 2012, p. 7E2-1--7E2-9. [Bibtex]
    @inproceedings{heller2012,
    author  = {Heller, Christoph and Blümm, Christian and Bouckaert, Stefan and Wei, Liu and Moerman, Ingrid and van Wesemael, Peter and Pollin, Sofie and Solc, Tomaz and Padrah, Zoltan},
    title  = {Spectrum Sensing for Cognitive Wireless Applications Inside Aircraft Cabins},
    booktitle  = {{IEEE Digital Avionics Systems Conference}},
    year  = {2012},
    month  = {10},
    pages  = {7E2-1--7E2-9},
    issn  = {2155-7195},
    doi  = {10.1109/DASC.2012.6382425},
    location  = {Williamsburg, VA, USA},
    publisher  = {IEEE},
    keywords  = {avionics,cognitive radio,protocols,radiofrequency interference,FP7 project CREW,aircraft cabin environment,cognitive protocols,cognitive radio techniques},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1585},
    abstract  = {Wireless intra-aircraft communication is expected to be the enabler for more flexible avionic systems and the reduction of weight and cost in system installations. An alternative to the usage of a dedicated frequency band for wireless intra-aircraft avionics could be the usage of a virtually unregulated ISM band. Cognitive radio techniques could be used to increase system robustness in the likely case of interferences in this kind of frequency bands. A cognitive wireless cabin management system is discussed as a use-case for the validation of this approach. Using the mobile cognitive radio testbed of the FP7 project CREW, spectrum sensing experiments are carried out in a realistic aircraft cabin environment as a baseline for the development of suitable cognitive protocols and to record interference scenarios for the further system design.},
    }
  • G. Vinci, S. Lindner, F. Barbon, M. Hofmann, G. Fischer, D. Kissinger, and A. Koelpin, "24 GHz Six-Port Medical Radar for Contactless Respiration Detection and Heartbeat Monitoring" in European Microwave Week (EuMW) 2012, 2012. [Bibtex]
    @inproceedings{vinci2012f,
    author  = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Hofmann, Maximilian and Fischer, Georg and Kissinger, Dietmar and Koelpin, Alexander},
    title  = {24 GHz Six-Port Medical Radar for Contactless Respiration Detection and Heartbeat Monitoring},
    booktitle  = {{European Microwave Week (EuMW) 2012}},
    year  = {2012},
    month  = {10},
    day  = {28},
    location  = {Amsterdam, Netherlands},
    publisher  = {IEEE},
    keywords  = {Six-Port,Bioradar,Vital Sign Monitoring,Heartbeat Detection,Respiration Detection},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1031},
    abstract  = {For numerous medical applications it is of primary interest to monitor the breath rate and heartbeat of a patient over time. Especially important is to observe the respiration of a patient over night to detect potential sleep disorders. Furthermore, heartbeat frequency is also a precious informationwhich can help to improve diverse diagnosis procedures. In orderto better analyze these vital parameters an innovative contactlessrespiration detection and heartbeat monitoring technique hasbeen developed. This novel method is based on the six-portinterferometric radar and is capable of detecting breath rateas well as heartbeat frequency without applying sensors orelectrodes on the patients body.},
    }
  • [DOI] G. Dehm-Andone, R. Mzyk, F. Hausknecht, G. Fischer, R. Weigel, and A. Koelpin, "Filter Design Aspects in Analog Receiver Front-Ends for Frequency Scanning Applications" in International Symposium on Signals, Systems and Electronics 2012, 2012, pp. 1-4. [Bibtex]
    @inproceedings{dehm-andone2012,
    author  = {Dehm-Andone, Gunther and Mzyk, Raphael and Hausknecht, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Filter Design Aspects in Analog Receiver Front-Ends for Frequency Scanning Applications},
    booktitle  = {{International Symposium on Signals, Systems and Electronics 2012}},
    year  = {2012},
    month  = {10},
    day  = {03},
    pages  = {1--4},
    doi  = {10.1109/ISSSE.2012.6374312},
    location  = {Potsdam, Germany},
    keywords  = {Front-End,Filter design,RF,Filter bank,IF filter,Design aspects},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1001},
    abstract  = {In this paper, the design of filter components for a frequency scanning receiver RF front-end is described. The front-end is an integral component of a multichannel scanning and DF (direction finding) system. It covers a broad frequency range of VHF (very high frequency) and UHF (ultra high frequency) from 30MHz to 3GHz and comprises a scalable multichannel digital receiver as well as a hybrid synchronizable double superheterodyne analog receiver approach with direct sampling path. Focus is put on optimizing cost and benefit by balancing system and filter design efforts and choosing efficient technologies for filter implementation using COTS (commercial off-the-shelf) components. The design and implementation of a reconfigurable preselection filter bank, a coupled line resonator IF (intermediate frequency) filter, and a COTS IF filter bank are presented. The performance of these modules is demonstrated by measurement and simulation results.},
    }
  • S. Lindner, F. Barbon, G. Vinci, R. Weigel, and A. Koelpin, "Initial Calibration Procedure of a Six-port Receiver System for Complex Data Reception" in 9th European Radar Conference (EuRAD), 2012, 2012, pp. 570-573. [Bibtex]
    @inproceedings{lindner2012,
    author  = {Lindner, Stefan and Barbon, Francesco and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    title  = {Initial Calibration Procedure of a Six-port Receiver System for Complex Data Reception},
    booktitle  = {{9th European Radar Conference (EuRAD), 2012}},
    year  = {2012},
    month  = {10},
    pages  = {570--573},
    location  = {Amsterdam, NL},
    keywords  = {calibration,demodulation,radio receivers,signal reconstruction,baseband voltage digitization,binary data reconstruction,calibration procedure,complex data reception,constellation diagram,data symbol correction},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6450730},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1316},
    abstract  = {In this publication a six-port receiver system for reception of modulated I/Q-data is shown. The system contains of passive six-port and diode structures to mix the signal to baseband. After digitizing the baseband voltages, a complex vector can be calculated. The binary data reconstruction is done by mapping these complex vector to the correct data symbol in the constellation diagram. Therefore, the data rate has to be reconstructed as described here. Furthermore, a simple calibration technique is explained and some measurements are taken to prove the functionality of the system and the simulation results.},
    }
  • [DOI] M. Jung, G. Fischer, R. Weigel, and T. Ußmüller, "A CMOS divider family for high frequency wireless localization systems" in International Semiconductor Conference Dresden - Grenoble (ISCDG), 2012, pp. 29-32. [Bibtex]
    @inproceedings{jung2012,
    author  = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A CMOS divider family for high frequency wireless localization systems},
    booktitle  = {{International Semiconductor Conference Dresden - Grenoble (ISCDG)}},
    year  = {2012},
    month  = {09},
    pages  = {29--32},
    isbn  = {978-1-4673-1717-7},
    doi  = {10.1109/ISCDG.2012.6359997},
    location  = {Grenoble},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1280},
    }
  • R. Weigel, A. Koelpin, G. Vinci, S. Lindner, and F. Barbon, "High Accuracy Industrial Positioning Sensors Based on Six-Port Technology" in Kleinheubacher Tagung, 2012. [Bibtex]
    @inproceedings{weigel2012c,
    author  = {Weigel, Robert and Koelpin, Alexander and Vinci, Gabor and Lindner, Stefan and Barbon, Francesco},
    title  = {High Accuracy Industrial Positioning Sensors Based on Six-Port Technology},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2012},
    month  = {09},
    location  = {Kleinheubach, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1574},
    }
  • R. Quay and D. Kissinger, "Microwave and millimeter-wave integrated circuits MTT-6: The RF core chips of the 21st century (guest editorial)", IEEE Microwave Magazine, vol. 13, iss. 6, pp. 24-141, 2012. [Bibtex]
    @article{quay2012,
    author  = {Quay, Rainer and Kissinger, Dietmar},
    title  = {Microwave and millimeter-wave integrated circuits MTT-6: The RF core chips of the 21st century (guest editorial)},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2012},
    month  = {09},
    pages  = {24--141},
    issn  = {1527-3342},
    publisher  = {IEEE},
    volume  = {13},
    number  = {6},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1140},
    }
  • [DOI] A. Schwarzmeier, L. Reuter, J. Mena-Carrillo, W. Weber, G. Fischer, R. Weigel, and D. Kissinger, "A Low-Power Embedded Communication Platform for Medical Applications" in 46th annual conference of the German Society for Biomedical Engineering, 2012. [Bibtex]
    @inproceedings{schwarzmeier2012,
    author  = {Schwarzmeier, Andre and Reuter, Lukas and Mena-Carrillo, Juan and Weber, Werner and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A Low-Power Embedded Communication Platform for Medical Applications},
    booktitle  = {{46th annual conference of the German Society for Biomedical Engineering}},
    year  = {2012},
    month  = {09},
    day  = {13},
    doi  = {10.1515/bmt-2012-4103},
    location  = {Jena, Germany},
    keywords  = {Medical,Platform,Energy,Budget},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1000},
    abstract  = {Introduction This paper presents a scalable, flexible and energy efficient embedded communication platform for seamless data transfer of medical sensor signals from the sensor acquisition point to a medical service centre. The presented platform can be used as an assistance system for improved medical support and care of patients and lifestyle users by providing vital parameter data to the service centre for a variety of individual assistance services. Methods The presented hardware platform is comprised of two functional blocks. A sensor platform has been implemented containing a medical device controller for collection of the data of various medical sensors connected via an analog front end or by an integrated Bluetooth transceiver module. Furthermore, a communication module including an A-GPS receiver enables GSM and UMTS data and voice connections to a central infrastructure and provides positioning data of the patient current location. The software protocol stack for the sensor data transmission is kept flexible in order to allow different communication standards. Special emphasis has been put on the energy management concept to optimize the battery life time and increase patient acceptance. Results The modular hardware and software co-design allows the connection of a wide range of different medical sensors, adjusted to the patient needs and specific use case. The use of data reduction and pre-processing techniques allows a reduction of the amount of data transferred to the infrastructure. Additionally, the centralized aggregation of sensor data enables short transmission times. This, in conjunction with an application specific energy management concept, leads to an increased battery life time. Conclusion The presented platform allows the collection of vital parameters from a variety of medical sensors for personal assistance of patients and elderly people. This concept allows new possibilities in diagnosis and treatment with the goal of an increased quality of life through the extension of independent at-home living periods.},
    }
  • D. Sonner, "Suppression of electromagnetic interference in the vehicle for broadcast reception" in Kleinheubacher Tagung, 2012. [Bibtex]
    @inproceedings{sonner2012,
    author  = {Sonner, Daniel},
    title  = {Suppression of electromagnetic interference in the vehicle for broadcast reception},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2012},
    month  = {09},
    location  = {Kleinheubach, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1582},
    }
  • [DOI] G. Vinci, F. Barbon, S. Lindner, R. Weigel, and A. Koelpin, "Six-Port, High-Resolution Smart Antenna Alignment Sensor" in International Conference on Electromagnetics in Advanced Applications, Antennas and Propagation in Wireless Communications (APWC) 2012, 2012, pp. 280-283. [Bibtex]
    @inproceedings{vinci2012e,
    author  = {Vinci, Gabor and Barbon, Francesco and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {Six-Port, High-Resolution Smart Antenna Alignment Sensor},
    booktitle  = {{International Conference on Electromagnetics in Advanced Applications, Antennas and Propagation in Wireless Communications (APWC) 2012}},
    year  = {2012},
    month  = {09},
    day  = {02},
    pages  = {280--283},
    isbn  = {978-1-4673-0404-7},
    doi  = {10.1109/APWC.2012.6324912},
    location  = {Cape Town, South Africa},
    publisher  = {IEEE},
    keywords  = {Antenna measurements,Microwave communication,Receiving antennas,Wireless sensor networks,Six-Port,Enhanced Six-Port,Smart Antenna},
    number  = {13058997},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1030},
    abstract  = {For several wireless data transmission systems the relevance of the information is dependent on the position of the information source. Therefore, Direction Of Arrival (DOA) detection of an incoming radio frequency signal is for several applications an important task. Typical applications for which DOA detection is relevant are for instance high-accuracy indoor navigation systems and dedicated high-speed wireless data links. For accurate DOA analysis a six-port receiver front-end is proposed. Benefits of the six-port architecture are high bandwidth and low circuit complexity. A solution for simultaneous data reception and DOA detection with the enhanced six-port receiver concept is also presented.},
    }
  • [DOI] M. Hein, M. Helbig, M. Kmec, J. Sachs, F. Scotto di Clemente, R. Stephan, M. Hamouda, T. Ußmüller, R. Weigel, M. Robens, R. Wunderlich, and S. Heinen, "Ultra-wideband active array imaging for biomedical diagnostics" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, 2012. [Bibtex]
    @inproceedings{hein2012,
    author  = {Hein, Matthias and Helbig, Marko and Kmec, Martin and Sachs, Jürgen and Scotto di Clemente, Francesco and Stephan, Ralph and Hamouda, Mohammed and Ußmüller, Thomas and Weigel, Robert and Robens, Markus and Wunderlich, Ralf and Heinen, Stefan},
    title  = {Ultra-wideband active array imaging for biomedical diagnostics},
    booktitle  = {{IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications}},
    year  = {2012},
    month  = {09},
    day  = {02},
    doi  = {10.1109/APWC.2012.6324920},
    location  = {Cape Town, South Africa},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1039},
    abstract  = {Ultra-wideband active array imaging has proven extremely valuable for biomedical diagnostics. At the same time, the underlying technologies have achieved a high degree of maturity. Across institutions, we have merged our expertise in M-sequence radar systems, antennas, low-noise and high-power circuitry, to devise an UWB MIMO radar system for breast tumour localisation. Recent progress in UWB imaging and hardware for active antenna arrays is presented.},
    }
  • [DOI] L. Reuter, R. Weigel, G. Fischer, and A. Schwarzmeier, "Energy budget in mobile health assistance systems" in BMT 2012, 46. DGBMT Jahrestagung, 2012. [Bibtex]
    @inproceedings{reuter2012b,
    author  = {Reuter, Lukas and Weigel, Robert and Fischer, Georg and Schwarzmeier, Andre},
    title  = {Energy budget in mobile health assistance systems},
    booktitle  = {{BMT 2012, 46. DGBMT Jahrestagung}},
    year  = {2012},
    month  = {09},
    doi  = {10.1515/bmt-2012-4038},
    location  = {Jena, DE},
    volume  = {57},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1567},
    }
  • I. Nasr, M. Hofmann, A. Radwan, B. Lämmle, G. Fischer, D. Kissinger, and R. Weigel, "Microwave wideband spectroscopy techniques targeting biomedical sensing applications" in Joint Symposium on Opto- and Microelectronic Devices and Circuits, 2012, pp. 1-4. [Bibtex]
    @inproceedings{nasr2012b,
    author  = {Nasr, Ismail and Hofmann, Maximilian and Radwan, Ahmed and Lämmle, Benjamin and Fischer, Georg and Kissinger, Dietmar and Weigel, Robert},
    title  = {Microwave wideband spectroscopy techniques targeting biomedical sensing applications},
    booktitle  = {{Joint Symposium on Opto- and Microelectronic Devices and Circuits}},
    year  = {2012},
    month  = {09},
    pages  = {1--4},
    location  = {Hangzhou, China},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1147},
    }
  • A. Talai, A. Koelpin, and R. Weigel, "Erforschung geeigneter Modellierungstechniken für 3D Hochfrequenzstruktursimulationen zur Bestimmung der effektiven relativen Permittivität für porosizierte LTCC Substrate" in U.R.S.I. Kleinheubacher Tagung 2012, 2012. [Bibtex]
    @inproceedings{talai2012,
    author  = {Talai, Armin and Koelpin, Alexander and Weigel, Robert},
    title  = {Erforschung geeigneter Modellierungstechniken für 3D Hochfrequenzstruktursimulationen zur Bestimmung der effektiven relativen Permittivität für porosizierte LTCC Substrate},
    booktitle  = {{U.R.S.I. Kleinheubacher Tagung 2012}},
    year  = {2012},
    month  = {09},
    location  = {Miltenberg},
    publisher  = {URSI},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1079},
    abstract  = {Die relative Permittivität eps_r eines keramischen Hochfrequenz-Substrates wie LTCC (engl.: Low Temperature Cofired Ceramics) kann durch nasschemische Ätzverfahren lokal reduziert werden, indem ein Teil des dielektrischen Verbundwerkstoffes herausgelöst wird. Mit dieser Methode soll die Abstrahlcharakteristik von Patchantennen-Arrays, wie bspw. für KFZ-Radare der nächsten Generation, optimiert werden. In diesem Beitrag werden dazu erforderliche 3D-Hochfrequenzstruktursimulationsansätze vorgestellt, welche einen ersten Eindruck für das Potential über die Manipulationsmöglichkeiten von ǫr durch diese neue Technologie liefern. Die Vorstellung einer messtechnischen Validierungsmöglichkeit mittels Ringresonatoren rundet die erzielten Simulationserkenntnisse ab.},
    }
  • M. Kuehn, W. John, and R. Weigel, "Validierung einer Messmethode zur Erfassung der magnetischen Schirmdaempfung eines Gehaeuses aus Drahtgeflecht und Vergleich mit einem analytischen Modell" in Kleinheubacher Tagung, 2012. [Bibtex]
    @inproceedings{kuehn2012,
    author  = {Kuehn, M. and John, Werner and Weigel, Robert},
    title  = {Validierung einer Messmethode zur Erfassung der magnetischen Schirmdaempfung eines Gehaeuses aus Drahtgeflecht und Vergleich mit einem analytischen Modell},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2012},
    month  = {09},
    location  = {Kleinheubach, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1580},
    }
  • [DOI] B. Lämmle, G. Vinci, L. Maurer, R. Weigel, and A. Koelpin, "A 77-GHz Six-Port Receiver Front-End for High-Precision Angle-of-Arrival Detection", IEEE Journal of Solid-State Circuits, vol. 47, iss. 9, pp. 1966-1973, 2012. [Bibtex]
    @article{laemmle2012b,
    author  = {Lämmle, Benjamin and Vinci, Gabor and Maurer, Linus and Weigel, Robert and Koelpin, Alexander},
    title  = {A 77-GHz Six-Port Receiver Front-End for High-Precision Angle-of-Arrival Detection},
    journal  = {{IEEE Journal of Solid-State Circuits}},
    year  = {2012},
    month  = {09},
    pages  = {1966--1973},
    issn  = {0018-9200},
    doi  = {10.1109/JSSC.2012.2201271},
    publisher  = {IEEE},
    keywords  = {Antenna measurements,Bandwidth,Couplers,Detectors,Receivers,Radar,Frequency Measurement,bipolar integrated circuits,radio direction-finding,angle-of-arrival detection,automotive radar calibration,Six-Port},
    volume  = {47},
    number  = {9},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1036},
    abstract  = {In this paper an integrated six-port receiver front-end for angle-of-arrival detection of 77-GHz signals is presented. Applications of the circuit are direction finding, automotive radar calibration, or high precision industrial radar. The measurement principle is based on passive superposition of two incident signals and power detection. The circuit features two input amplifiers, a broadband passive six-port network, and four power detectors. The integrated circuit has a power consumption of 95 mW with 5 V supply voltage. It is fabricated in a 200-GHz fT SiGe bipolar technology and occupies only 1028 × 1128 μm2. The circuit operates in a 3-dB bandwidth from 75 GHz to 84 GHz and has a responsivity of 152 kV/W at 80 GHz. A simple calibration method is proposed and all calibration parameters are calculated for different frequency values.},
    }
  • [DOI] C. Carlowitz, M. Vossiek, A. Eßwein, and R. Weigel, "Synthesis of Pulsed Frequency Modulated Ultra Wideband Radar Signals Based on Stepped Phase Shifting" in IEEE Internation Conference on Ultra-Wideband (ICUWB), 2012, 2012, pp. 343-346. [Bibtex]
    @inproceedings{carlowitz2012a,
    author  = {Carlowitz, Christian and Vossiek, Martin and Eßwein, Alexander and Weigel, Robert},
    title  = {Synthesis of Pulsed Frequency Modulated Ultra Wideband Radar Signals Based on Stepped Phase Shifting},
    booktitle  = {{IEEE Internation Conference on Ultra-Wideband (ICUWB), 2012}},
    year  = {2012},
    month  = {09},
    pages  = {343--346},
    issn  = {2162-6588},
    doi  = {10.1109/ICUWB.2012.6340471},
    location  = {Syracuse, NY},
    keywords  = {phase modulation,signal synthesis,ultra wideband radar,voltage-controlled oscillators,PFM UWB signals,UWB pulses,VCO-based synthesizer,angle modulation schemes},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1318},
    abstract  = {The current paper introduces a novel concept for low complexity and low power synthesis of pulsed frequency modulated ultra wideband (PFM UWB) signals. Instead of using a VCO-based synthesizer, we employ a simple digitally tuned phase modulator that varies the phase of a high order harmonic of a fixed frequency LO signal. The phase modulated harmonic is then injected into a switched injection locked pulse oscillator. Based on this concept, an arbitrary sequence of phase samples - i.e. UWB pulses where each pulse has a predefined carrier phase - can be generated. This sampled pulse sequence can be used for the generation of angle modulation schemes for communication signals and also for the generation of pulsed linear frequency modulated radar signals. The capability of the proposed concept is experimentally demonstrated for the synthesis of 6 to 8 GHz UWB pulsed frequency sweeps. Measurement results verify that this novel approach delivers a performance comparable to much more complex pulsed frequency modulation implementations.},
    }
  • J. Bialek, F. Ohnhäuser, A. Wickmann, G. Fischer, and R. Weigel, "Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer" in Kleinheubacher Tagung, 2012. [Bibtex]
    @inproceedings{bialek2012,
    author  = {Bialek, Jan and Ohnhäuser, Frank and Wickmann, Andreas and Fischer, Georg and Weigel, Robert},
    title  = {Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2012},
    month  = {09},
    location  = {Kleinheubach, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1573},
    }
  • M. Gardill, R. Weigel, and A. Koelpin, "A Wideband Unidirectional Antenna Array Element With Stable Radiation Pattern" in IEEE Topical Conference on Antennas and Propagation in Wireless Communications, 2012. [Bibtex]
    @inproceedings{gardill2012a,
    author  = {Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    title  = {A Wideband Unidirectional Antenna Array Element With Stable Radiation Pattern},
    booktitle  = {{IEEE Topical Conference on Antennas and Propagation in Wireless Communications}},
    year  = {2012},
    month  = {09},
    day  = {07},
    location  = {Cape Town, South Africa},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/938},
    abstract  = {modification of the famous Bow Tie antenna element for wideband Direction-Of-Arrival estimation antenna arrays is designed. A constant input impedance as well as a very stable radiation pattern over a 37\% bandwidth from 5.5 GHz to 8 GHz is achieved. In addition the proposed design uses a double layer substrate and hence allows for direct integration of the feed network and analog RF circuitry directly into the antenna array. The particular design is suited for low-cost integration and optimized for a wireless high-precision localization system.},
    }
  • [DOI] F. Grimminger, G. Fischer, R. Weigel, and D. Kissinger, "Optimum Transistor Sizing for Low-Power Subthreshold Standard Cell Designs" in International Semiconductor Conference Dresden Grenoble, 2012, pp. 151-153. [Bibtex]
    @inproceedings{grimminger2012,
    author  = {Grimminger, Florian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Optimum Transistor Sizing for Low-Power Subthreshold Standard Cell Designs},
    booktitle  = {{International Semiconductor Conference Dresden Grenoble}},
    year  = {2012},
    month  = {09},
    day  = {24},
    pages  = {151--153},
    doi  = {10.1109/ISCDG.2012.6360033},
    location  = {Grenoble},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1013},
    abstract  = {This paper presents a simple method for standard cell optimization in the subthreshold regime. Through proper dimensioning of the transistor length and width an improved symmetric propagation delay and a reduction in dynamic power consumption compared to conventional CMOS standard cell implementations is achieved. The performance of the presented cells has been verified using logic gate arrays and ring oscillators with high number of stages. The measurement results reasonably agree with simulation data.},
    }
  • [DOI] J. Brendel, S. Rieß, A. Stöckle, R. Rummel, and G. Fischer, "A Spectrum Sensing Network for Cognitive PMSE Systems", Frequenz, vol. 66, iss. 9-10, pp. 269-277, 2012. [Bibtex]
    @article{brendel2012b,
    author  = {Brendel, Johannes and Rieß, Steffen and Stöckle, Andreas and Rummel, Rafael and Fischer, Georg},
    title  = {A Spectrum Sensing Network for Cognitive PMSE Systems},
    journal  = {{Frequenz}},
    year  = {2012},
    month  = {09},
    pages  = {269--277},
    issn  = {0016-1136},
    doi  = {10.1515/freq-2012-0049},
    publisher  = {Schiele und Sohn},
    keywords  = {PMSE,cognitive radio,spectrum sensing network,scanning receiver},
    volume  = {66},
    number  = {9-10},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1007},
    abstract  = {This article is about a Spectrum Sensing Network (SSN) which generates an accurate radio environment map (e.g. power over frequency, time, and location) from a given application area. It is intended to be used in combination with cognitive Program Making and Special Events (PMSE) devices (e.g. wireless microphones) to improve their operation reliability. The SSN consists of a distributed network of multiple scanning radio receivers and a central data management and storage unit. The parts of the SSN are presented in detail and the advantages and use cases of such a sensing network structure will be outlined.},
    }
  • [DOI] A. Eßwein, C. Carlowitz, M. Vossiek, G. Fischer, R. Weigel, and T. Ußmüller, "An Integrated Switched Infection-Locked Oscillator for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems" in IEEE International Conference on Ultra-Wideband (ICUWB), 2012. [Bibtex]
    @inproceedings{esswein2012,
    author  = {Eßwein, Alexander and Carlowitz, Christian and Vossiek, Martin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {An Integrated Switched Infection-Locked Oscillator for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems},
    booktitle  = {{IEEE International Conference on Ultra-Wideband (ICUWB)}},
    year  = {2012},
    month  = {09},
    doi  = {10.1109/ICUWB.2012.6340458},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1278},
    }
  • [DOI] F. Barbon, G. Vinci, S. Lindner, R. Weigel, and A. Koelpin, "A Six-Port Interferometer Based Micrometer-Accuracy Displacement and Vibration Measurement Radar" in IEEE IMS2012 International Microwave Symposium, 2012. [Bibtex]
    @inproceedings{barbon2012a,
    author  = {Barbon, Francesco and Vinci, Gabor and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {A Six-Port Interferometer Based Micrometer-Accuracy Displacement and Vibration Measurement Radar},
    booktitle  = {{IEEE IMS2012 International Microwave Symposium}},
    year  = {2012},
    month  = {06},
    day  = {17},
    isbn  = {978-1-4673-1086-4},
    doi  = {10.1109/MWSYM.2012.6259624},
    location  = {Montreal},
    publisher  = {IEEE},
    keywords  = {six-port,vibrometer,positioning,calibration,phase measurement,interferometer,radar},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1012},
    abstract  = {Displacement detection and vibration measure- ments are important requirements for automation and me- chanical stress diagnosis in diverse industrial environments. Laser interferometry is a widely used technique for these kinds of measurements since it features high-resolution, wide dynamic range and wide frequency response. Another advantage of the laser interferometry technique is contactless diagnosis/sensing which allows remote operations. However this technique is not suitable in harsh environments for instance with the presence of dust or fog which occur in several industrial production sites. In this paper a new contactless radar based vibration measurement technique is presented. It features an RF frontend based on a passive six- port interferometer working at 24 GHz. A dedicated signal processing unit is also presented. The proposed hardware allows to measure with a position accuracy of 0.5 µm.},
    }
  • [DOI] G. Vinci, F. Barbon, B. Lämmle, R. Weigel, and A. Koelpin, "A Wide-Range 77 GHz Direction of Arrival Detector with Integrated Dual Six-Port Receiver" in International Microwave Symposium (IMS) 2012, 2012, pp. 1-3. [Bibtex]
    @inproceedings{vinci2012d,
    author  = {Vinci, Gabor and Barbon, Francesco and Lämmle, Benjamin and Weigel, Robert and Koelpin, Alexander},
    title  = {A Wide-Range 77 GHz Direction of Arrival Detector with Integrated Dual Six-Port Receiver},
    booktitle  = {{International Microwave Symposium (IMS) 2012}},
    year  = {2012},
    month  = {06},
    day  = {17},
    pages  = {1--3},
    isbn  = {978-1-4673-1085-7},
    doi  = {10.1109/MWSYM.2012.6259622},
    location  = {Montreal, Canada},
    publisher  = {IEEE},
    keywords  = {Calibration,Detectors,Microwave Circuits,Receiving Antennas,Silicon Germanium,Six-Port},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1028},
    abstract  = {The six-port Direction Of Arrival (DOA) detector has opened a whole new set of possibilities and implementations for novel industrial sensors and radar applications. Detection ambiguity issues as well as challenging calibration techniques are still the main problems of this technology. In this paper the design of an innovative DOA detector system is presented, addressing especially solutions to the problems mentioned above. The proposed device works at 77 GHz and features an integrated Silicon-Germanium (SiGe) dual six-port receiver. Design issues are addressed as well as an overview of the DOA detector system. The highlights are high accuracy, wide range of DOA detection with no ambiguity issues, flexibility, low-complexity and low-cost.},
    }
  • C. Blümm and C. Heller, "C2 and Payload in one Link – Chances and Challenges of OFDM" in Convention for Telemetry, Test Instrumentation and Telecontrol, 2012. [Bibtex]
    @inproceedings{bluemm2012,
    author  = {Blümm, Christian and Heller, Christoph},
    title  = {C2 and Payload in one Link – Chances and Challenges of OFDM},
    booktitle  = {{Convention for Telemetry, Test Instrumentation and Telecontrol}},
    year  = {2012},
    month  = {06},
    location  = {Munich, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1584},
    abstract  = {Unmanned aerial vehicles (UAVs), as well as unmanned ground vehicles (UGVs), are increasingly used in military operations to avoid endangerment of pilots and soldiers. Also civil use cases for such kind of platforms are emerging, for instance for surveillance or search and rescue missions. The operation of unmanned vehicles in most cases requires two different types of data connections: A command and control (C2) link to pilot the unmanned vehicle in its mission environment as well as a payload link to transfer sensor or video data to the ground control station. While the C2 link has to be optimized with respect to maximum robustness, the sensor data link has to provide data rates in the range of several Mbit/s for reasonable operation. The conventional solution is to use two independent data links, each with a modulation that is optimized for its transmission requirements. The usage of Orthogonal Frequency Division Multiplexing (OFDM) allows the realization of multiple logical links with different transmission characteristics in a single waveform and in a single modem. The set of orthogonal carrier functions provided by an OFDM modulation for this purpose is partitioned into multiple sets of carriers that are assigned to the individual logical links. The different carrier sets are used with specific subcarrier modulation schemes and code rates, depending on the robustness required by the logical link. These parameters, together with the number of subcarriers per carrier set, determine the usable data rate of each logical link. In this paper, we present the design of an OFDM waveform for the simultaneous transmission of control and payload data in a UAV/UGV scenario for security services video surveillance, originating from the German funded project “Sichere Navigation für autonome Robotik-Plattformen” (SiNafaR). We point out specific design considerations as well as benefits and drawbacks of this integrated data link solution, and we give performance figures of the final link implementation to validate the concep},
    }
  • [DOI] M. Gonser, C. Keller, J. Hansen, V. Khilkevich, A. Radachenko, R. Weigel, and D. Pommerenke, "Simulation of Automotive EMC Emission Test Procedures Based on Cable Bundle Measurements" in IEEE MTT-S International Symposium Digest (IMS), 2012, 2012, pp. 1-3. [Bibtex]
    @inproceedings{gonser2012,
    author  = {Gonser, Markus and Keller, Christian and Hansen, Jan and Khilkevich, Victor and Radachenko, Andriy and Weigel, Robert and Pommerenke, David},
    title  = {Simulation of Automotive EMC Emission Test Procedures Based on Cable Bundle Measurements},
    booktitle  = {{IEEE MTT-S International Symposium Digest (IMS), 2012}},
    year  = {2012},
    month  = {06},
    pages  = {1--3},
    issn  = {0149-645X},
    doi  = {10.1109/MWSYM.2012.6259432},
    location  = {Montreal, QC, CA},
    keywords  = {Antenna measurements,Electromagnetic compatibility,Integrated circuit modeling,Numerical models,Power cables,Stochastic processes},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1315},
    abstract  = {Two time efficient simulation methods for the prediction of the conducted and radiated automotive EMC emission tests, respectively, are presented. To verify the correct prediction of the cable bundle model, a novel cable bundle test bench has been developed. It allows a fully automated network analysis with up to 32 ports. Several types of cable bundles are experimentally characterized under stochastic considerations. The system simulation for the conducted emission setup is partitioned into four parts connected on circuit level. The statistically analyzed voltage at the output of the line impedance stabilization network is in very good agreement to respective measurements. To simulate the radiated emission a novel method is presented, where the setup is partitioned by the use of Huygens principle. The simulated prediction of the antenna voltage is in good agreement with respective measurements. The presented approaches are very time efficient and therefore can be used effectively during product development.},
    }
  • G. Vinci, F. Barbon, B. Lämmle, R. Weigel, and A. Koelpin, "Six-Port Based Direction Finding and Micrometer-Accuracy Displacement Detection" in CST European User Group Meeting (CST EUGM) 2012, 2012. [Bibtex]
    @inproceedings{vinci2012c,
    author  = {Vinci, Gabor and Barbon, Francesco and Lämmle, Benjamin and Weigel, Robert and Koelpin, Alexander},
    title  = {Six-Port Based Direction Finding and Micrometer-Accuracy Displacement Detection},
    booktitle  = {{CST European User Group Meeting (CST EUGM) 2012}},
    year  = {2012},
    month  = {06},
    location  = {Mannheim},
    publisher  = {IEEE},
    keywords  = {Six-Port},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1029},
    }
  • [DOI] I. Nasr, M. Dudek, R. Weigel, and D. Kissinger, "A 33\% Tuning Range High Output Power V-Band Superharmonic Coupled Quadrature VCO in SiGe Technology" in IEEE Radio Frequency Integrated Circuits Conference, 2012. [Bibtex]
    @inproceedings{nasr2012a,
    author  = {Nasr, Ismail and Dudek, Manuel and Weigel, Robert and Kissinger, Dietmar},
    title  = {A 33\% Tuning Range High Output Power V-Band Superharmonic Coupled Quadrature VCO in SiGe Technology},
    booktitle  = {{IEEE Radio Frequency Integrated Circuits Conference}},
    year  = {2012},
    month  = {06},
    day  = {19},
    doi  = {10.1109/RFIC.2012.6242286},
    location  = {Montreal, Canada},
    keywords  = {Quadrature oscillator (QVCO),Colpitts,Wide tuning range,superharmonic coupling},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/963},
    abstract  = {Abstract—This paper presents a wide tuning range superharmonic coupled quadrature Colpitts VCO with high output power. The circuit was fabricated using a low-cost SiGe technology with an ft/fmax of 200/250 GHz. The quadrature VCO employs a novel area efficient coupling technique that uses second harmonic coupling. Downcoversion mixers are implemented to provide an intermediate frequency signal, enabling easier measurement. A phase imbalance below 2 degrees is measured between the quadrature outputs, over a 6 GHz tuning range. The quadrature VCO can be tuned between 55 and 76.5 GHz having a record tuning range of approx. 33\%. Moreover, the quadrature VCO has a maximum measured output power of +10.5dBm, and a minimum phase noise of -97 dBc/Hz. The overall chip draws 303mA from a 3.3V supply.},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, R. Weigel, and D. Kissinger, "An integrated 125 GHz sensor with read-out circuit for permittivity measurement of liquids" in IEEE MTT-S International Microwave Symposium, 2012, pp. 1-3. [Bibtex]
    @inproceedings{laemmle2012a,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar},
    title  = {An integrated 125 GHz sensor with read-out circuit for permittivity measurement of liquids},
    booktitle  = {{IEEE MTT-S International Microwave Symposium}},
    year  = {2012},
    month  = {06},
    pages  = {1--3},
    location  = {Montreal, Canada},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1156},
    }
  • [DOI] B. Waldmann, R. Weigel, R. Ebelt, and M. Vossiek, "An Ultra-Wideband Local Positioning System for Highly Complex Indoor Environments" in International Conference on Localization and GNSS, 2012, pp. 1-5. [Bibtex]
    @inproceedings{waldmann2012,
    author  = {Waldmann, Benjamin and Weigel, Robert and Ebelt, Randolf and Vossiek, Martin},
    title  = {An Ultra-Wideband Local Positioning System for Highly Complex Indoor Environments},
    booktitle  = {{International Conference on Localization and GNSS}},
    year  = {2012},
    month  = {06},
    day  = {26},
    pages  = {1--5},
    isbn  = {978-1-4673-2342-0},
    doi  = {10.1109/ICL-GNSS.2012.6253125},
    location  = {Starnberg, DE},
    keywords  = {CW radar,FM radar,indoor radio,ultra wideband communication,1D localization applications,2D localization applications,3D localization applications,FMCW radar principle,UWB local positioning system,bandwidth 1 GHz,dense multipath indoor environments,frequency 7.5 GHz,frequency modulated continuous wave radar principle,high precision local positioning radar,highly complex indoor environments,multipath environments,ultrawideband local positioning system,Accuracy,Bandwidth,Distance measurement,Frequency modulation,Radar,Signal to noise ratio},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1266},
    abstract  = {In this paper a novel approach for a high precision local positioning radar using an ultra-wideband (UWB) technique is presented. The concept is based on the standard frequency modulated continuous wave (FMCW) radar principle combined with short pulses to fulfill the emission limits given by the official regulatory authorities. Besides the well known advantages of a FMCW radar, the proposed system implies a wide frequency bandwidth. With this concept, a high accuracy in dense multipath indoor environments can be achieved, ideally suited for 1D, 2D, and 3D localization applications for complex industrial environments. Investigations on the achievable performance of such an UWB system show very promising results and are presented within this paper. A prototype system was fabricated which operates at the center frequency of 7.5 GHz utilizing a bandwidth of 1 GHz. With the setup presented in this paper the distance between two wireless units can be measured achieving a standard deviation and absolute accuracy in the low centimeter range, even in challenging multipath environments.},
    }
  • [DOI] S. Zorn, M. Gardill, R. Rose, A. Götz, R. Weigel, and A. Koelpin, "A Smart Jamming System for UMTS/WCDMA Cellular Phone Networks for Search and Rescue Applications" in IEEE MTT-S International Microwave Symposium Digest (MTT), 2012, 2012, pp. 1-3. [Bibtex]
    @inproceedings{zorn2012,
    author  = {Zorn, Stefan and Gardill, Markus and Rose, Richard and Götz, Alexander and Weigel, Robert and Koelpin, Alexander},
    title  = {A Smart Jamming System for UMTS/WCDMA Cellular Phone Networks for Search and Rescue Applications},
    booktitle  = {{IEEE MTT-S International Microwave Symposium Digest (MTT), 2012}},
    year  = {2012},
    month  = {06},
    pages  = {1--3},
    issn  = {0149-645X},
    doi  = {10.1109/MWSYM.2012.6257769},
    location  = {Montreal, QC, CA},
    keywords  = {GSM,Jamming,Mobile communication,Mobile handsets,Multiaccess communication,Radio frequency,Spread spectrum communication,FPGA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1327},
    abstract  = {Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. This paper introduces one part of the I-LOV project, endorsed by the German Federal Ministry of Education and Research. In this project partners from relief organizations, universities and industry investigate enhancements to disaster handling and victim rescue. One possible option is to take advantage of the fact, that a lot of people own a mobile phone today. To locate a person by his or her mobile phone requires to take over the phone by an own Base Transceiver Station (BTS). Jamming all other networks is one option to achieve that. This paper will introduce a new Field Programmable Gate Array (FPGA) based jamming system which disturbs only the absolute necessary parts of the WCDMA spectrum but reliably cuts all connections between mobile stations (MS) and existing BTS. The whole system including the signal generator and the front end will be discussed. Also measurement results will be shown.},
    }
  • G. Fischer, "Systemaspekte im Umfeld der Analog-Digital Balance von Transceivern" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{fischer2012a,
    author  = {Fischer, Georg},
    title  = {Systemaspekte im Umfeld der Analog-Digital Balance von Transceivern},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1558},
    }
  • M. Maser, M. Gardill, P. Gulden, G. Fischer, R. Weigel, and T. Ußmüller, "Local Positioning mit einem integrierten Breitband-FMCW System" in Electrical and Electronic Engineering for Communication, EEEfCOM 2012, 2012. [Bibtex]
    @inproceedings{maser2012a,
    author  = {Maser, Matthias and Gardill, Markus and Gulden, Peter and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Local Positioning mit einem integrierten Breitband-FMCW System},
    booktitle  = {{Electrical and Electronic Engineering for Communication, EEEfCOM 2012}},
    year  = {2012},
    month  = {05},
    day  = {22},
    location  = {Ulm, Germany},
    publisher  = {GEROTRON COMMUNICATION GmbH},
    keywords  = {Local Positioning},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1009},
    }
  • [DOI] C. Hartmann, J. Rascher, R. Weigel, G. Fischer, and T. Ußmüller, "A CMOS RF Front-End IC for Multi Antenna Diversity Applications in the S-Band" in 19th International Conference on Microwaves, Radar and Wireless Communications (MIKON), 2012, pp. 483-486. [Bibtex]
    @inproceedings{hartmann2012a,
    author  = {Hartmann, Christian and Rascher, Jochen and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    title  = {A CMOS RF Front-End IC for Multi Antenna Diversity Applications in the S-Band},
    booktitle  = {{19th International Conference on Microwaves, Radar and Wireless Communications (MIKON)}},
    year  = {2012},
    month  = {05},
    day  = {21},
    pages  = {483 - 486},
    doi  = {10.1109/MIKON.2012.6233580},
    location  = {Poland, Warsaw},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/988},
    abstract  = {In recent years the reception of audio broadcast signals via satellite has become popular, especially in the United States with the SDARS-system, supplying high quality broadcast services in particular to customers with mobile usage scenarios like in cars. There, the problem of reception impairments due to multipath wave propagation in urban areas or influences from dense foliage of the surrounding vegetation affects the broadcast quality. A possibility to minimize signal interruptions and to enhance the reception quality is the application of fast switchable multi antenna diversity receivers. In this paper we present the concept of an integrated RF front-end IC for such a system and describe the design of several important building blocks. The circuits are implemented in a 150nm CMOS technology from LFoundry in Landshut, Germany.},
    }
  • T. Lautenbacher, C. Schmidt, M. Fehr, M. Kamper, R. Weigel, G. Fischer, and A. Koelpin, "Klasse-E Leistungsverstärker mit Lastmodulation" in EEEfCOM 2012, 2012. [Bibtex]
    @inproceedings{lautenbacher2012a,
    author  = {Lautenbacher, Thomas and Schmidt, Christian and Fehr, Matthias and Kamper, Michael and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    title  = {Klasse-E Leistungsverstärker mit Lastmodulation},
    booktitle  = {{EEEfCOM 2012}},
    year  = {2012},
    month  = {05},
    day  = {22},
    location  = {Ulm Germany},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1015},
    }
  • A. Ferizi and A. Koelpin, "Baseband Signal Processing for Wireless Sensor Nodes with Capability of FMCW Local Positioning" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{ferizi2012a,
    author  = {Ferizi, Alban and Koelpin, Alexander},
    title  = {Baseband Signal Processing for Wireless Sensor Nodes with Capability of FMCW Local Positioning},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1560},
    }
  • [DOI] S. Schröter, R. Weigel, G. Fischer, and A. Koelpin, "A practical beamsteering algorithm with low phase fluctuation for WCDMA/HSUPA uplink using transmit power control bits as feedback" in 19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012, 2012, pp. 641-646. [Bibtex]
    @inproceedings{schroeter2012,
    author  = {Schröter, Simon and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    title  = {A practical beamsteering algorithm with low phase fluctuation for WCDMA/HSUPA uplink using transmit power control bits as feedback},
    booktitle  = {{19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012}},
    year  = {2012},
    month  = {05},
    pages  = {641--646},
    doi  = {10.1109/MIKON.2012.6233563},
    location  = {Warsaw, Poland},
    volume  = {2},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1017},
    abstract  = {So called open loop transmit diversity algorithms for the uplink of HSPA are a topic of recent studies within the 3rd Generation Partnership Project (3GPP). These algorithms use the power control commands of the fast power control mechanism as a feedback information to iteratively determine the antenna weights, thus making them compatible with existing networks and procedures. In this paper, a novel practical beamsteering algorithm is presented. Simulations show, that the transmit power at the UE terminal can be reduced by 3.28 dB compared to the reference case of only one transmit antenna, thus improving the UE's battery life. Moreover, the novel algorithm exhibits a significantly lower rate of change of the transmitted signal's absolute phase than the algorithms presented within the 3GPP studies, which means less irritation to the receiver at the Node B.},
    }
  • [DOI] C. Söll, J. Walk, G. Fischer, R. Weigel, and T. Ußmüller, "Implantable Antenna for Medical Sensor Platforms" in 19th International Conference on Microwave, Radar and Wireless Communications (MIKON), 2012, pp. 402-405. [Bibtex]
    @inproceedings{soell2012,
    author  = {Söll, Christopher and Walk, Jasmin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Implantable Antenna for Medical Sensor Platforms},
    booktitle  = {{19th International Conference on Microwave, Radar and Wireless Communications (MIKON)}},
    year  = {2012},
    month  = {05},
    pages  = {402--405},
    doi  = {10.1109/MIKON.2012.6233487},
    location  = {Warsaw},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1277},
    }
  • R. Schnabel, D. Mittelstraß, T. Binzer, C. Waldschmidt, and R. Weigel, "Reflection, Refraction, and Self-Jamming", IEEE Microwave Magazine, pp. 107-117, 2012. [Bibtex]
    @article{schnabel2012,
    author  = {Schnabel, Raik and Mittelstraß, Delf and Binzer, Thomas and Waldschmidt, Christian and Weigel, Robert},
    title  = {Reflection, Refraction, and Self-Jamming},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2012},
    month  = {05},
    pages  = {107--117},
    issn  = {1527-3342},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1138},
    }
  • A. Schenk, "Coding, Modulation, and Detection for Impulse-Radio-Ultra-Wideband" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{schenk2012,
    author  = {Schenk, A.},
    title  = {Coding, Modulation, and Detection for Impulse-Radio-Ultra-Wideband},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1562},
    }
  • J. Rettenbach, "Signal Shaping for Unique-Word OFDM by Selected Mapping" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{rettenbach2012,
    author  = {Rettenbach, J.},
    title  = {Signal Shaping for Unique-Word OFDM by Selected Mapping},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1563},
    }
  • [DOI] L. Reuter, R. Weigel, and G. Fischer, "A 16-Channel Synchronous Sampling Power Measurement System For Wireless Health Assistance Devices" in IEEE International Symposium on Medical Measurements and Apllications Proceedings (MeMeA), 2012, pp. 1-4. [Bibtex]
    @inproceedings{reuter2012a,
    author  = {Reuter, Lukas and Weigel, Robert and Fischer, Georg},
    title  = {A 16-Channel Synchronous Sampling Power Measurement System For Wireless Health Assistance Devices},
    booktitle  = {{IEEE International Symposium on Medical Measurements and Apllications Proceedings (MeMeA)}},
    year  = {2012},
    month  = {05},
    pages  = {1--4},
    doi  = {10.1109/MeMeA.2012.6226652},
    location  = {Budapest, HU},
    keywords  = {Ambient Assisted Living (AAL),medical devices,power measurement,wireless health assistance,energy harvesting,energy consumption characterization},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1308},
    abstract  = {A multi-channel synchronous sampling hardware for power measurement applications is described. Future body-worn medical devices for ambient assisted living should allow for battery run-times of several days without any user interaction for charging. In order to achieve this very challenging goal, a first step is the characterization of the components within medical devices by their power consumption or charging power in order to create models of power consumption over time. Medical devices often include several sensors and wireless interfaces which are known to be the most power consuming. This paper describes a hardware that is used as a tool for the measurement of power consumption of specific peripherals on a medical ambient assisted living device during development. Thus a model can be derived that can help optimizing battery run-time by deciding when to use which interface for data transmission or sensor data acquisition. Furthermore, the tool can quantify the amount of energy gained from an energy harvester. By assessing power drained from battery and power harvested the battery status over time can be studied and charging intervals derived.},
    }
  • J. Rascher, A. Zohny, and R. Weigel, "Techniques for Reconfigurable Integrated Power Amplifiers with RF Switches" in Electric and Electronic Engineering for Communication Workshop (EEEfCOM), 2012. [Bibtex]
    @inproceedings{rascher2012a,
    author  = {Rascher, Jochen and Zohny, Amr and Weigel, Robert},
    title  = {Techniques for Reconfigurable Integrated Power Amplifiers with RF Switches},
    booktitle  = {{Electric and Electronic Engineering for Communication Workshop (EEEfCOM)}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, Germany},
    publisher  = {GEROTRON COMMUNICATION GmbH},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1060},
    }
  • C. Musolff, "Aktuelle Ansaetze im Bereich der linearen HF Leisungsverstaerker" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{musolff2012,
    author  = {Musolff, Christian},
    title  = {Aktuelle Ansaetze im Bereich der linearen HF Leisungsverstaerker},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1555},
    }
  • [DOI] A. Koelpin, G. Vinci, B. Lämmle, S. Lindner, F. Barbon, and R. Weigel, "Six-Port Technology for Traffic Safety", IEEE Microwave Magazine, vol. 13, iss. 3, pp. 118-127, 2012. [Bibtex]
    @article{koelpin2012b,
    author  = {Koelpin, Alexander and Vinci, Gabor and Lämmle, Benjamin and Lindner, Stefan and Barbon, Francesco and Weigel, Robert},
    title  = {Six-Port Technology for Traffic Safety},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2012},
    month  = {05},
    pages  = {118--127},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2012.2185390},
    publisher  = {IEEE},
    keywords  = {six-port,AoA},
    volume  = {13},
    number  = {3},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/941},
    abstract  = {The market for driver-assistance systems for modern automobiles is rapidly growing. Formerly only provided for the luxury automotive market, these systems are nowadays more and more available for mid- and compact-class vehicles as well. This development is not only limited to the passenger car segment but is also more and more important for commercial vehicles and trucks. Some driving assistance systems have already become mandatory, e.g., the antilock breaking system (ABS). Some governments are currently thinking about requiring automatic distance control by law for heavy trucks. Automatic distance control in combination with an automatic emergency breaking system is one of the rising stars for enhancing traffic safety. Radar- based distance control mostly interacts with cruise control systems and it adapts the speed of the driver's car to the distance to the car or obstacle in front of the vehicle. Furthermore, unavoidable accidents are detected and actions for reducing the effects of the crash are automatically initiated for some systems.},
    }
  • A. Koelpin, "Ueberblick 6-Tor Technologie in der Positionstechnik" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{koelpin2012c,
    author  = {Koelpin, Alexander},
    title  = {Ueberblick 6-Tor Technologie in der Positionstechnik},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1559},
    }
  • [DOI] A. Hagelauer, T. Ußmüller, and R. Weigel, "SAW and CMOS RFID Transponder-based Wireless Systems and their Applications" in IEEE International Frequency Control Symposium, 2012, pp. 1-4. [Bibtex]
    @inproceedings{hagelauer2012,
    author  = {Hagelauer, Amelie and Ußmüller, Thomas and Weigel, Robert},
    title  = {SAW and CMOS RFID Transponder-based Wireless Systems and their Applications},
    booktitle  = {{IEEE International Frequency Control Symposium}},
    year  = {2012},
    month  = {05},
    pages  = {1--4},
    doi  = {10.1109/FCS.2012.6243630},
    location  = {Baltimore},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1167},
    }
  • A. Zohny, J. Rascher, and R. Weigel, "Simulation and Implementation Demands for State-of-the-Art Integrated Linear Power Amplifiers" in Electrical and Electronic Engineering for Communication EEEfCOM 2012, 2012. [Bibtex]
    @inproceedings{zohny2012,
    author  = {Zohny, Amr and Rascher, Jochen and Weigel, Robert},
    title  = {Simulation and Implementation Demands for State-of-the-Art Integrated Linear Power Amplifiers},
    booktitle  = {{Electrical and Electronic Engineering for Communication EEEfCOM 2012}},
    year  = {2012},
    month  = {05},
    day  = {23},
    location  = {Ulm},
    keywords  = {Linearity,Power Amplifier,CMOS,ACPR,Intermodulation},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1045},
    }
  • L. Zimmermann, "Sensors and Wireless Data Distribution in Agriculture" in TGGS Multidisciplinary Seminar, 2012. [Bibtex]
    @inproceedings{zimmermann2012b,
    author  = {Zimmermann, Lars},
    title  = {Sensors and Wireless Data Distribution in Agriculture},
    booktitle  = {{TGGS Multidisciplinary Seminar}},
    year  = {2012},
    month  = {05},
    location  = {Bangkok, TH},
    publisher  = {The Sirindhorn International Thai-German Graduate School of Engineering},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1692},
    }
  • [DOI] D. Kissinger, R. Agethen, and R. Weigel, "A Versatile Built-In Test Architecture for Integrated Millimeter-Wave Radar Receiver Front-Ends" in IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2012, 2012, pp. 254-258. [Bibtex]
    @inproceedings{kissinger2012b,
    author  = {Kissinger, Dietmar and Agethen, Roman and Weigel, Robert},
    title  = {A Versatile Built-In Test Architecture for Integrated Millimeter-Wave Radar Receiver Front-Ends},
    booktitle  = {{IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2012}},
    year  = {2012},
    month  = {05},
    pages  = {254--258},
    issn  = {1091-5281},
    doi  = {10.1109/I2MTC.2012.6229244},
    location  = {Graz, AT},
    keywords  = {built-in self test,millimetre wave radar,radar receivers,built-in test architecture,direct down-conversion receiver,integrated millimeter-wave radar receiver front-end,millimeter wave,Noise measurement},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1326},
    abstract  = {This paper presents a versatile direct built-in test architecture for integrated radar receiver front-ends. It is used for determination of the gain and noise figure of a direct down-conversion receiver. The general test structure is introduced and a detailed analysis of different approaches for the test signal injection and calibration are given.},
    }
  • [DOI] M. Wojnowski, G. Sommer, and R. Weigel, "Device Characterization Techniques Based on Causal Relationships", IEEE Transactions on Microwave Theory and Techniques, vol. 60, iss. 7, pp. 2203-2219, 2012. [Bibtex]
    @article{wojnowski2012a,
    author  = {Wojnowski, Maciej and Sommer, Grit and Weigel, Robert},
    title  = {Device Characterization Techniques Based on Causal Relationships},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2012},
    month  = {05},
    day  = {17},
    pages  = {2203--2219},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2012.2195018},
    publisher  = {IEEE},
    keywords  = {Calibration,microwave measurements,scattering parameters},
    volume  = {60},
    number  = {7},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1297},
    abstract  = {In this paper, we introduce a novel technique for vector network analyzer (VNA) scattering parameter (S -parameter) device characterization. The presented approach is based on causal relationships that provide a connection between the real and imaginary parts as well as between the magnitude and phase of causal network functions. We discuss the problems encountered in the practical implementation of the dispersion relationships such as numerical evaluation of the singular integrals, finite bandwidth of the experimental data, reconstruction artifacts, and nonuniqueness of dispersion relationships. To reduce these problems, we use the generalized dispersion relationships with reference points (subtractions). We develop integral relationships with subtractions and corresponding estimates for error bounds. We show that an appropriate placement of the reference points can significantly reduce the errors caused by finite spectrum. We analyze the applicability of the developed dispersion relationships to the VNA measurements. We demonstrate that certain parameters can be measured with considerably higher accuracy compared with other parameters and that it is possible to select samples from the measured data that can be used as reference points for dispersive integrals. Based on these observations, we propose a device characterization technique that consists of the causality-constrained reconstruction of the sensitive parameters of the measured devices based on more accurately measured characteristics. The proposed technique allows one to accurately characterize the parameters, like quality factor of a high-quality (high- Q) inductors or loss tangent of low-loss transmission lines, of which direct measurement is normally not possible due to limited sensitivity and dynamic range of the VNA. To demonstrate the effectiveness of the proposed technique, we reconstruct the resistance and the quality factor of a high-Q inductor from the accurately measured inductance.},
    }
  • M. Kamper, "Effiziente HF Leisungsverstaerker mit geschalteten Transistoren" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{kamper2012,
    author  = {Kamper, Michael},
    title  = {Effiziente HF Leisungsverstaerker mit geschalteten Transistoren},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1556},
    }
  • [DOI] M. Wiehl, S. Schwarzer, G. Fischer, R. Weigel, and A. Koelpin, "Channgel Impulse response Inside a Magnetic Resonance Imaging Device at 0.8 GHz to 27 GHz" in 19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012, 2012, pp. 85-88. [Bibtex]
    @inproceedings{wiehl2012a,
    author  = {Wiehl, Michael and Schwarzer, Stefan and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Channgel Impulse response Inside a Magnetic Resonance Imaging Device at 0.8 GHz to 27 GHz},
    booktitle  = {{19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012}},
    year  = {2012},
    month  = {05},
    pages  = {85--88},
    doi  = {10.1109/MIKON.2012.6233474},
    location  = {Warsaw, PL},
    keywords  = {UHF antennas,biomedical MRI,biomedical communication,biomedical telemetry,microwave antennas,radio links,transient response,wireless channels},
    volume  = {1},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1317},
    abstract  = {Up to now, wireless transmission in a magnetic resonance imaging (MRI) device is not used extensively for sensor networks or data transmission. Wireless sensors measuring physiological parameters like pulse, ECG, blood pressure or temperature would increase patient safety during a measurement. Beside and rather more interesting is the transmission of MRI sensor data. Patients benefit from higher comfort in the magnet and faster preparation for a measurement procedure. The wireless channels in an MRI device are not well studied at present. In this paper we give a first overview of the available antenna configurations for wireless links and summarize published results. As an MRI device is located in a shielded chamber, the frequency range for a transmission can be chosen freely above the resonance frequencies of the nuclei. To get an insight in the MRI channels we studied in a first approach three exemplary channels at the GSM-900 band, the 5 GHz WLAN band and the 24 GHz ISM band in three scenarios: empty, a real patient, a NaCl-filled tube.},
    }
  • W. Gerstacker, "Resource Allocation for GSM MUROS/VAMOS" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2012. [Bibtex]
    @inproceedings{gerstacked2012,
    author  = {Gerstacker, Wolfgang},
    title  = {Resource Allocation for GSM MUROS/VAMOS},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2012},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1561},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Essel, J. Heidrich, G. Fischer, and R. Weigel, "A Multistandard HF/ UHF-RFID-Tag With Integrated Sensor Interface and Localization Capability" in 6th Annual IEEE International Conference on RFID, 2012, pp. 66-73. [Bibtex]
    @inproceedings{ussmueller2012,
    author  = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    title  = {A Multistandard HF/ UHF-RFID-Tag With Integrated Sensor Interface and Localization Capability},
    booktitle  = {{6th Annual IEEE International Conference on RFID}},
    year  = {2012},
    month  = {04},
    pages  = {66--73},
    isbn  = {978-1-4673-0329-3},
    doi  = {10.1109/RFID.2012.6193058},
    location  = {Orlando, FL},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1276},
    }
  • M. Hofmann, J. Edelmann, A. Bolz, R. Weigel, G. Fischer, and D. Kissinger, "Modeling and Experimental Investigation of Microwave Cardiopulmonary Resuscitation Feedback Systems" in The 7th German Microwave Conference (GeMiC), 2012, 2012, pp. 1-4. [Bibtex]
    @inproceedings{hofmann2012e,
    author  = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Bolz, Armin and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Modeling and Experimental Investigation of Microwave Cardiopulmonary Resuscitation Feedback Systems},
    booktitle  = {{The 7th German Microwave Conference (GeMiC), 2012}},
    year  = {2012},
    month  = {03},
    pages  = {1--4},
    issn  = {2167-8022},
    location  = {Ilmenau, DE},
    keywords  = {HF antennas,biomechanics,biomedical measurement,cardiovascular system,compressibility,electromagnetic fields,feedback,antennas},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6185166},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1328},
    abstract  = {This paper presents a novel scalable 3D thorax model for electromagnetic (EM) field simulations. Two antennas operating at 1.6 GHz are designed and matched for application in a cardiopulmonary resuscitation (CPR) feedback system. A microwave based CPR feedback system is investigated by applying the new thorax model. The fabricated antennas are evaluated in self-experiments. Magnitude and phase measurements are compared with simulation results. It is shown, that the thorax compression during CPR can be monitored with the proposed RF based approach with good agreement to the EM simulation.},
    }
  • S. Rieß and J. Brendel, "Konzept eines Netzwerks zur Spektrumsbeobachtung für C-PMSE-Systeme" in RADCOM 2012 - Radar and Communication, 2012. [Bibtex]
    @inproceedings{riess2012,
    author  = {Rieß, Steffen and Brendel, Johannes},
    title  = {Konzept eines Netzwerks zur Spektrumsbeobachtung für C-PMSE-Systeme},
    booktitle  = {{RADCOM 2012 - Radar and Communication}},
    year  = {2012},
    month  = {03},
    day  = {27},
    location  = {Hamburg-Harburg / Germany},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/985},
    }
  • [DOI] A. Ferizi, B. Höher, M. Jung, G. Fischer, and A. Koelpin, "Design and Implementation of a Fixed-Point Radix-4 FFT Optimized for Local Positioning in Wireless Sensor Networks" in 9th International Multi-Conference on Systems, Signals & Devices, 2012. [Bibtex]
    @inproceedings{ferizi2012,
    author  = {Ferizi, Alban and Höher, Bernhard and Jung, Melanie and Fischer, Georg and Koelpin, Alexander},
    title  = {Design and Implementation of a Fixed-Point Radix-4 FFT Optimized for Local Positioning in Wireless Sensor Networks},
    booktitle  = {{9th International Multi-Conference on Systems, Signals & Devices}},
    year  = {2012},
    month  = {03},
    doi  = {10.1109/SSD.2012.6197958},
    location  = {Chemnitz, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/953},
    }
  • [DOI] L. Zimmermann, A. Götz, G. Fischer, and R. Weigel, "GSM Mobile Phone Localization using Time Difference of Arrival and Angle of Arrival Estimation" in 9th International Multi-Conference on Systems, Signals and Devices (SSD), 2012, pp. 1-7. [Bibtex]
    @inproceedings{zimmermann2012a,
    author  = {Zimmermann, Lars and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    title  = {GSM Mobile Phone Localization using Time Difference of Arrival and Angle of Arrival Estimation},
    booktitle  = {{9th International Multi-Conference on Systems, Signals and Devices (SSD)}},
    year  = {2012},
    month  = {03},
    pages  = {1--7},
    doi  = {10.1109/SSD.2012.6197970},
    location  = {Chemnitz, AT},
    keywords  = {cellular radio,direction-of-arrival estimation,mobile handsets,parameter estimation,radiowave propagation,signal classification,AOA,GSM mobile phone localization},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1311},
    abstract  = {The localization methods time difference of arrival (TDOA) and angle of arrival (AOA) are investigated in their capability of high-resolution detection of GSM signals. Because GSM is of narrowband nature, a bandwidth expansion technique that significantly increases the resolution of TDOA is introduced. The algorithms maximum likelihood estimator (for TDOA), root multiple signal classification and estimation of signal parameters via rotational invariance techniques (for AOA) are proposed as a reference for each method. Simulations conducted with noisy signals and multipath propagation demonstrate the potential of TDOA for GSM localization, especially for search and rescue applications. AOA on the other hand is very sensitive to multipath, and is therefore only recommended for open space scenarios.},
    }
  • C. Carlowitz, A. Eßwein, R. Weigel, and M. Vossiek, "A Low Power Pulse Frequency Modulated UWB Radar Transmitter Concept Based on Switschen Injection Locked Harmonic Sampling" in 7th German Microwave Conference (GeMiC), 2012, pp. 1-4. [Bibtex]
    @inproceedings{carlowitz2012,
    author  = {Carlowitz, Christian and Eßwein, Alexander and Weigel, Robert and Vossiek, Martin},
    title  = {A Low Power Pulse Frequency Modulated UWB Radar Transmitter Concept Based on Switschen Injection Locked Harmonic Sampling},
    booktitle  = {{7th German Microwave Conference (GeMiC)}},
    year  = {2012},
    month  = {03},
    day  = {13},
    pages  = {1--4},
    isbn  = {978-3-9812668-4-9},
    issn  = {2167-8022},
    location  = {Ilmenau, DE},
    keywords  = {harmonics,injection locked oscillators,navigation,position measurement,pulse frequency modulation,radar receivers,radar signal processing,radar transmitters,radiofrequency amplifiers,radiofrequency oscillators,signal generators,ultra wideband communication,ultra wideband radar,voltage-controlled oscillators,PFM-UWB radar signal generation,SILO,UWB ranging,UWB spectral mask,baseband FM signal,harmonic sampling,impulse radio UWB systems,injected harmonic phase,linear RF amplifiers,low power pulse frequency modulated UWB radar transmitter,power consumption,switched injection locked harmonic sampling,tunable RF-VCO,wireless local positioning,Bandwidth,Frequency estimation,Frequency modulation,Harmonic analysis,Time frequency analysis,Ultra-wideband (UWB),injection locking,radar,radio navigation,radio position measurement,transponders},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6185196},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1271},
    abstract  = {Pulse Frequency Modulated ultra-wideband (PFM-UWB) radar signals have been introduced as a very capable option for UWB ranging and wireless local positioning. PFM-UWB signals allow for simple correlating receivers and for a very efficient use of the UWB spectral mask. The generation of pulse frequency modulated (PFM) ultra-wideband (UWB) signals usually requires a fast tunable RF-VCO and good linear RF amplifiers. The resulting complexity and power consumption of a PFM-UWB transmitter can be considered as a drawback compared e.g. to simple impulse radio UWB systems. In this paper, a PFM UWB transmitter concept is introduced that overcomes these drawbacks. The novel approach is based on harmonic sampling with a switched injection locked oscillator (SILO). RF signal generation is solely based on a very simple fixed frequency pulsed LO that samples the phase of an injected harmonic of a baseband FM signal. In this paper the basic concept for switched injection locked harmonic sampling PFM UWB signal generation is introduced and its feasibility is proved through measurements with a 7-8 GHz PFM UWB transmitter prototype.},
    }
  • J. Brendel, S. Rieß, A. Stöckle, R. Rummel, R. Rose, and G. Fischer, "A Spectrum Sensing Network for Cognitive PMSE Systems" in 7th Workshop on Software Radios (WSR), 2012, pp. 137-142. [Bibtex]
    @inproceedings{brendel2012,
    author  = {Brendel, Johannes and Rieß, Steffen and Stöckle, Andreas and Rummel, Rafael and Rose, Richard and Fischer, Georg},
    title  = {A Spectrum Sensing Network for Cognitive PMSE Systems},
    booktitle  = {{7th Workshop on Software Radios (WSR)}},
    year  = {2012},
    month  = {03},
    pages  = {137--142},
    issn  = {1616-6019},
    location  = {Karlsruhe},
    publisher  = {Karlsruhe Institute of Technology - Communication Engineering Lab},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/984},
    abstract  = {This paper is about a Spectrum Sensing Network (SSN) which generates an accurate radio environment map (e.g. power over frequency, time, and location) from a given application area. It is intended to be used in combination with cognitive Program Making and Special Events (PMSE) devices (e.g. wireless microphones). It consists of a distributed network of multiple scanning radio receivers and a central data management and storage unit. The parts of the SSN are presented in detail and the advantages and the use cases of such a sensing network structure are outlined.},
    }
  • [DOI] J. Hasch, E. Topak, R. Schnabel, T. Zwick, R. Weigel, and C. Waldschmidt, "Millimeter-Wave Technology for Automotive Radar Sensors in the 77 GHz Frequency Band", IEEE Transactions on Microwave Theory and Techniques, vol. 60, iss. 3, pp. 845-860, 2012. [Bibtex]
    @article{hasch2012,
    author  = {Hasch, Jürgen and Topak, E. and Schnabel, Raik and Zwick, Thomas and Weigel, Robert and Waldschmidt, Christian},
    title  = {Millimeter-Wave Technology for Automotive Radar Sensors in the 77 GHz Frequency Band},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2012},
    month  = {03},
    pages  = {845--860},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2011.2178427},
    publisher  = {IEEE},
    keywords  = {antennas,millimetre wave radar,packaging,road vehicle radar,advanced packaging concepts,antenna systems,Automotive radar,Sensors},
    volume  = {60},
    number  = {3},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1319},
    abstract  = {The market for driver assistance systems based on millimeter-wave radar sensor technology is gaining momentum. In the near future, the full range of newly introduced car models will be equipped with radar based systems which leads to high volume production with low cost potential. This paper provides background and an overview of the state of the art of millimeter-wave technology for automotive radar applications, including two actual silicon based fully integrated radar chips. Several advanced packaging concepts and antenna systems are presented and discussed in detail. Finally measurement results of the fully integrated radar front ends are shown.},
    }
  • F. Hausknecht, R. Mzyk, G. Dehm-Andone, G. Fischer, and R. Weigel, "A Digital Platform for a Multichannel Digital Wideband Scanning Receiver" in 7th Karlsruhe Workshop on Software Radios, 2012. [Bibtex]
    @inproceedings{hausknecht2012,
    author  = {Hausknecht, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Fischer, Georg and Weigel, Robert},
    title  = {A Digital Platform for a Multichannel Digital Wideband Scanning Receiver},
    booktitle  = {{7th Karlsruhe Workshop on Software Radios}},
    year  = {2012},
    month  = {03},
    day  = {07},
    location  = {Karlsruhe},
    keywords  = {Digital,Platform,Multichannel,Scanning,Receiver,Architecture},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1048},
    }
  • [DOI] F. Hausknecht, R. Mzyk, G. Dehm-Andone, U. Trautwein, G. Fischer, and R. Weigel, "Efficient Firmware Implementation of a Multichannel Scanning Receiver for Surveillance Applications" in IEEE International Conference on Communication and Signal Processing 2012, 2012. [Bibtex]
    @inproceedings{hausknecht2012a,
    author  = {Hausknecht, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Trautwein, Uwe and Fischer, Georg and Weigel, Robert},
    title  = {Efficient Firmware Implementation of a Multichannel Scanning Receiver for Surveillance Applications},
    booktitle  = {{IEEE International Conference on Communication and Signal Processing 2012}},
    year  = {2012},
    month  = {03},
    day  = {20},
    doi  = {10.1109/SSD.2012.6197940},
    location  = {Chemnitz},
    keywords  = {Scanning,Surveillance,Receiver,Firmware,Digital,Multichannel},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1047},
    }
  • J. Brendel, S. Rieß, A. Stöckle, R. Rose, G. Fischer, and R. Rummel, "A Spectrum Sensing Network for Cognitive PMSE Systems" in 7th Workshop on Software Radios, 2012. [Bibtex]
    @inproceedings{brendel2012a,
    author  = {Brendel, Johannes and Rieß, Steffen and Stöckle, Andreas and Rose, Richard and Fischer, Georg and Rummel, Rafael},
    title  = {A Spectrum Sensing Network for Cognitive PMSE Systems},
    booktitle  = {{7th Workshop on Software Radios}},
    year  = {2012},
    month  = {03},
    location  = {Karlsruhe, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1568},
    }
  • G. Vinci, F. Barbon, B. Lämmle, R. Weigel, and A. Koelpin, "Wide-Range, Dual Six-Port based Direction-Of-Arrival Detector" in German Microwave Conference (GeMiC) 2012, 2012, pp. 1-4. [Bibtex]
    @inproceedings{vinci2012b,
    author  = {Vinci, Gabor and Barbon, Francesco and Lämmle, Benjamin and Weigel, Robert and Koelpin, Alexander},
    title  = {Wide-Range, Dual Six-Port based Direction-Of-Arrival Detector},
    booktitle  = {{German Microwave Conference (GeMiC) 2012}},
    year  = {2012},
    month  = {03},
    day  = {12},
    pages  = {1--4},
    isbn  = {978-1-4577-2096-3},
    issn  = {2167-8022},
    location  = {Ilmenau, Germany},
    publisher  = {IEEE},
    keywords  = {Calibration,Detectors,Dynamic range,Phase measurement,Radio frequency,Receivers,Schottky diodes,Six-Port},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6185176},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1027},
    abstract  = {Direction-Of-Arrival (DOA) detection is a challenge and a demanding task for several applications among industrial sensors and automotive radar where high accuracy, robustness, and low cost are important requirements. The six-port receiver based DOA detector has opened a whole new set of possibilities and implementations due to its accurate phase measurement properties. The DOA detection angle ambiguity issue of the six-port receiver caused by phase measurement periodicity is hereby adressed. A new high resolution dual six-port based detector is presented featuring among the advantages provided by the interferometric principle also an ambiguity-free wide detection range.},
    }
  • F. Schuh, "Continuous Phase Modulation mit inkohaerentem Empfang" in RADCOM 2012, 2012. [Bibtex]
    @inproceedings{schuh2012,
    author  = {Schuh, Fabian},
    title  = {Continuous Phase Modulation mit inkohaerentem Empfang},
    booktitle  = {{RADCOM 2012}},
    year  = {2012},
    month  = {03},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1566},
    }
  • [DOI] M. Wojnowski, V. Issakov, G. Knoblinger, K. Pressel, G. Sommer, and R. Weigel, "High-Q Inductors Embedded in the Fan-Out Area of an eWLB", IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 2, iss. 8, pp. 1280-1292, 2012. [Bibtex]
    @article{wojnowski2012,
    author  = {Wojnowski, Maciej and Issakov, Vadim and Knoblinger, G. and Pressel, Klaus and Sommer, Grit and Weigel, Robert},
    title  = {High-Q Inductors Embedded in the Fan-Out Area of an eWLB},
    journal  = {{IEEE Transactions on Components, Packaging and Manufacturing Technology}},
    year  = {2012},
    month  = {03},
    day  = {20},
    pages  = {1280--1292},
    issn  = {2156-3950},
    doi  = {10.1109/TCPMT.2012.2186963},
    publisher  = {IEEE},
    keywords  = {Microwave measurements,packaging,passive circuits,phase noise,thin-film inductors,wafer-scale integration,voltage-controlled oscillators},
    volume  = {2},
    number  = {8},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1299},
    abstract  = {We investigate high-quality (high-Q) inductors implemented in the redistribution layer (RDL) of the fan-in and fan-out area of an embedded wafer-level ball grid array (eWLB) package. The eWLB is an innovative package technology introduced recently for wireless applications. The technology has outstanding capabilities especially for high-frequency and millimeter-wave package design. We demonstrate that inductors realized in the eWLB fan-out area have negligible substrate losses and lower parasitic capacitances compared to inductors in the eWLB fan-in area. As a result, the inductors implemented in the fan-out area offer significantly higher quality factors and higher self-resonance frequencies. We investigate the effects of the chip-to-package interconnection. We show that the chip-to-package transition creates a bottleneck for the integration of high-Q inductors. We demonstrate the advantages of inductors in the fan-out area of the eWLB on the example of a 6-GHz voltage-controlled oscillator (VCO) chip manufactured in a 65-nm complementary metal-oxide-semiconductor process and assembled in an eWLB package. For the LC tank of this example, we use a 1.1-nH high-Q differential fan-out eWLB inductor to reduce the phase noise. For comparison, we investigate a VCO fabricated with a standard on-chip inductor and assembled in the identical eWLB package. Our measurement results demonstrate lower phase noise and higher output power for all VCOs with inductors embedded in the RDL compared to the reference VCO with the on-chip inductor. The measured phase noise for the VCO with the eWLB inductor in the fan-out area is in the best case 9 dB lower than that of the reference VCO with the on-chip inductor. The presented results prove the integration concept and demonstrate the excellent potential of embedded inductors realized in the fan-out area of the eWLB package.},
    }
  • R. Mzyk, G. Dehm-Andone, F. Hausknecht, G. Fischer, R. Weigel, and A. Koelpin, "Design Aspects of Scanning Receiver Systems" in IEEE German Microwave Conference, 2012. [Bibtex]
    @inproceedings{mzyk2012,
    author  = {Mzyk, Raphael and Dehm-Andone, Gunther and Hausknecht, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Design Aspects of Scanning Receiver Systems},
    booktitle  = {{IEEE German Microwave Conference}},
    year  = {2012},
    month  = {03},
    location  = {Ilmenau, Germany},
    publisher  = {IEEE},
    keywords  = {Scanning receiver,frequency synthesis,reconfigurable filter,multi channel receiver},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/951},
    abstract  = {In this paper, a cost-effective approach on receiver systems for frequency scanning and direction finding applications is presented. It consists of a hybrid analog topology, combining direct sampling and double superheterodyne architecture, as well as a scalable digital platform that offers multi channel data aquisition requiring minimum hardware ressources. The receiver front-end covers the VHF (very high frequency) and UHF (ultra high frequency) band from 30MHz to 3GHz while a 50MHz instantaneous bandwidth can be processed. Key modules like a reconfigurable filter and low noise PLL (phase-locked loop) as well as a digital platform are highlighted and the trade-off between cost effectiveness and performance is investigated.},
    }
  • M. Wiehl, "Signal Processing in Frequency Domain Channel Impulse Response Measruements" in RADCOM 2012, 2012. [Bibtex]
    @inproceedings{wiehl2012,
    author  = {Wiehl, Michael},
    title  = {Signal Processing in Frequency Domain Channel Impulse Response Measruements},
    booktitle  = {{RADCOM 2012}},
    year  = {2012},
    month  = {03},
    location  = {Hamburg, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1565},
    }
  • [DOI] A. Koelpin, G. Vinci, F. Barbon, S. Lindner, G. Fischer, and R. Weigel, "The Six-Port Technology: A Low-Cost Concept for Precise Position Measurements" in International Multi-Conference on Systems, Signals and Devices (SSD) 2012, 2012, pp. 1-5. [Bibtex]
    @inproceedings{koelpin2012a,
    author  = {Koelpin, Alexander and Vinci, Gabor and Barbon, Francesco and Lindner, Stefan and Fischer, Georg and Weigel, Robert},
    title  = {The Six-Port Technology: A Low-Cost Concept for Precise Position Measurements},
    booktitle  = {{International Multi-Conference on Systems, Signals and Devices (SSD) 2012}},
    year  = {2012},
    month  = {03},
    day  = {20},
    pages  = {1--5},
    isbn  = {978-1-4673-1590-6},
    doi  = {10.1109/SSD.2012.6198100},
    location  = {Chemnitz},
    publisher  = {IEEE},
    keywords  = {Antenna measurements,Microwave circuits,Microwave integrated circuits,Microwave measurements,Receivers,direction-of-arrival estimation,Six-Port},
    number  = {12726797},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1034},
    abstract  = {Local positioning is a demanding task for industrial environments. With the help of six-port technology, a precise and easy to use concept for angle of arrival (AoA) and distance measurements will be presented in this publication. AoA resolution below 0.005° and resolving distances of 1μm for a 24 GHz six-port architecture will be shown by measurement results. Furthermore, impairments compensation issues and limitations of the technology will be discussed.},
    }
  • [DOI] R. Mzyk, G. Dehm-Andone, F. Hausknecht, G. Fischer, R. Weigel, and A. Koelpin, "Analysis of Key Modules in an Analog Front-End for Scanning Receiver Systems" in IEEE International Conference on Microwaves, Radar & Wireless Communications, 2012, pp. 45-49. [Bibtex]
    @inproceedings{mzyk2012a,
    author  = {Mzyk, Raphael and Dehm-Andone, Gunther and Hausknecht, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    title  = {Analysis of Key Modules in an Analog Front-End for Scanning Receiver Systems},
    booktitle  = {{IEEE International Conference on Microwaves, Radar & Wireless Communications}},
    year  = {2012},
    month  = {03},
    pages  = {45--49},
    doi  = {10.1109/MIKON.2012.6233481},
    location  = {Warsaw, Poland},
    publisher  = {IEEE},
    keywords  = {Scanning receiver,surveillance,clock distribution,frequency synthesis,reconfigurable filter},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/952},
    abstract  = {In this paper, a cost-effective approach on receiver systems for frequency scanning and direction finding applications is presented. A hybrid approach on analog front-end topology is introduced, that combines direct sampling and double superheterodyne architecture. Key modules like a reconfigurable filter, reference clock distribution units, and low noise PLL (phaselocked loop) are highlighted and the trade-off between cost effectiveness and performance is investigated. The performance of those modules is presented by measurement results.},
    }
  • L. Reuter, R. Agethen, F. Lurz, G. Fischer, R. Weigel, and D. Kissinger, "A mobile microcontroller platform for sensor fusion and communication" in Embedded World Conference, 2012, pp. 1-4. [Bibtex]
    @inproceedings{reuter2012,
    author  = {Reuter, Lukas and Agethen, Roman and Lurz, Fabian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A mobile microcontroller platform for sensor fusion and communication},
    booktitle  = {{Embedded World Conference}},
    year  = {2012},
    month  = {03},
    pages  = {1--4},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1146},
    }
  • M. Frick, R. Eidher, and R. Weigel, "Einfluss der Ic-Pin-Impedanz auf die Ergebnisse der leitungsgefuehrten Stoerfestigkeit integrierter Schaltungen" in Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit, 2012, pp. 183-190. [Bibtex]
    @inproceedings{frick2012,
    author  = {Frick, Marco and Eidher, R. and Weigel, Robert},
    title  = {Einfluss der Ic-Pin-Impedanz auf die Ergebnisse der leitungsgefuehrten Stoerfestigkeit integrierter Schaltungen},
    booktitle  = {{Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit}},
    year  = {2012},
    month  = {02},
    pages  = {183--190},
    location  = {Duesseldorf, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1577},
    abstract  = {Die Qualifizierung integrierter Schaltungen (IC) bezüglich ihrer elektromagnetischen Verträglichkeit (EMV) rückt auf Grund steigender Komplexität der Elektronikkomponenten im Automobilbereich immer mehr in den Vordergrund. Zur Durchführung dieser Tests werden die ICs samt ihrer Applikationsbeschaltung und der benötigten HF Ein- und Auskoppelnetzwerke auf eigens für diesen Zweck entwickelte Testleiterplatten aufgebracht. Auf Basis der so ermittelten Ergebnisse können bereits zu einem frühen Entwicklungszeitpunkt Aussagen über das EMV Verhalten des Halbleiters getroffen werden. Der Beitrag zeigt, wie sich der Einfluss der meist unbekannten Pin-Impedanz des IC im Zusammenspiel mit der EMV Prüfleiterplatte auf die Messergebnisse der leitungsgeführten Störaussendung des Halbleiters auswirkt. Zum Einsatz kommen ein Streuparameter De-embedding Verfahren und eine Sensitivitätsanalyse basierend auf der Methode des faktoriellen Designs.},
    }
  • [DOI] R. Neumayer and R. Weigel, "Challenges in Automotive Electromagnetics Compatibility Modeling and Simulation," in Electromagnetics in a Complex World, I. Pinto, V. Galdi, and L. Felsen, Eds., , 2012, vol. 96. [Bibtex]
    @inbook{neumayer2012,
    author  = {Neumayer, Roland and Weigel, Robert},
    editor  = {Pinto, I. and Galdi, V. and Felsen, L.},
    title  = {Challenges in Automotive Electromagnetics Compatibility Modeling and Simulation},
    series  = {Springer Proceedings in Physics},
    booktitle  = {{Electromagnetics in a Complex World}},
    year  = {2012},
    month  = {02},
    day  = {09},
    doi  = {10.1007/978-3-642-18596-0_8},
    volume  = {96},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/189},
    abstract  = {Electromagnetic compatibility (EMC) issues are increasingly important to the automotive industry. Problems arise from the growing use of electronic systems on the one hand and the lack of flexibility in placement or design of electronic modules on the other hand. Consequently, an accurate system-level EMC analysis is required from early stages of the vehicle design process. This paper presents a concurrent EMC simulation process that incorporates the EMC behavior of the electronic equipment in the system-level automotive EMC simulation. The proposed process helps to identify and reject potential EMC problems introduced by new technologies. This cuts the risk of EMC failure and avoids costly and time-consuming redesigns.},
    }
  • K. Freudenthaler, M. Huemer, L. Maurer, S. Paul, and M. Rupp, "UMTS Link-level demonstrations with smart antennas," in SMART ANTENNAS - STATE OF THE ART, Hindawi Publishing Corporation, 2012, vol. 3, pp. 759-786. [Bibtex]
    @inbook{freudenthaler2012,
    author  = {Freudenthaler, Klaus and Huemer, Mario and Maurer, Linus and Paul, Stefan and Rupp, Markus},
    title  = {UMTS Link-level demonstrations with smart antennas},
    series  = {EURASIP Book Series on Signal Processing Communications},
    booktitle  = {{SMART ANTENNAS - STATE OF THE ART}},
    year  = {2012},
    month  = {02},
    day  = {15},
    pages  = {759--786},
    isbn  = {978-977-5945-09-9},
    publisher  = {Hindawi Publishing Corporation},
    volume  = {3},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/552},
    }
  • K. Dufrene, "Second order intermodulation in direct conversion receivers - problems and solutions", 2012. [Bibtex]
    @other{krzysztof2012,
    author  = {Dufrene, Krzysztof},
    title  = {Second order intermodulation in direct conversion receivers - problems and solutions},
    booktitle  = {{}},
    year  = {2012},
    month  = {02},
    day  = {13},
    location  = {Pro Literatur Verlag Robert Mayer-Scholz},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/229},
    }
  • [DOI] F. Barbon, G. Vinci, S. Lindner, R. Weigel, and A. Koelpin, "Signal Processing Strategies for Six-Port Based Direction of Arrival Detector Systems" in SSD2012, 2012, pp. 1-5. [Bibtex]
    @inproceedings{barbon2012,
    author  = {Barbon, Francesco and Vinci, Gabor and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    title  = {Signal Processing Strategies for Six-Port Based Direction of Arrival Detector Systems},
    booktitle  = {{SSD2012}},
    year  = {2012},
    month  = {02},
    day  = {06},
    pages  = {1--5},
    doi  = {10.1109/SSD.2012.6197973},
    keywords  = {Direction-of-Arrival,Six-Port,Angle Measurement},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/112},
    abstract  = {Direction of Arrival (DOA) detection for industrial positioning is a relevant topic. Several applications make use of the six-port technology to perform phase difference based DOA measurements. The six-port receiver offers high accuracy, robustness and a low cost solution. The ability of this device to precisely measure a phase difference (hence a DOA angle) implies a correct acquisition of the signals delivered from the six-port detector as well as a correct digital signal processing. In this paper a dedicated acquisition platform for the six- port DOA detector is presented. Moreover, different software strategies to compute the DOA angle have been evaluated for an FPGA. Different types of algorithms have been implemented and compared using accuracy and throughput as references.},
    }
  • R. Weigel and L. Reindl, "Wireless Communication and Sensing Techniques Based on Surface Acoustic Wave Devices," in Review of Radio Science: 1999-2002 URSI, W. Stone, Ed., URSI, 2012. [Bibtex]
    @inbook{weigel2012a,
    author  = {Weigel, Robert and Reindl, Leonhard},
    editor  = {Stone, W},
    title  = {Wireless Communication and Sensing Techniques Based on Surface Acoustic Wave Devices},
    booktitle  = {{Review of Radio Science: 1999-2002 URSI}},
    year  = {2012},
    month  = {02},
    day  = {10},
    isbn  = {978-0-471-26866-6},
    publisher  = {URSI},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/199},
    }
  • R. Weigel, "Hochfrequenzsystemtechnik," in Informationstechnik kompakt, O. Mildenberger, Ed., Vieweg, 2012. [Bibtex]
    @inbook{weigel2012b,
    author  = {Weigel, Robert},
    editor  = {Mildenberger, O.},
    title  = {Hochfrequenzsystemtechnik},
    booktitle  = {{Informationstechnik kompakt}},
    year  = {2012},
    month  = {02},
    day  = {15},
    isbn  = {978-3-528-03871-7},
    publisher  = {Vieweg},
    keywords  = {Hochfrequenztechnik,Signale und Systeme,Filter,Informationstheorie und Quellencodierung,Kanalcodierung,Basisbandübertragung,Modulation,Transformationen},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/516},
    abstract  = {Informationstechnik kompakt stellt die theoretischen Grundlagen der Informations- und Nachrichtentechnik zusammen und vermittelt einen Überblick über die wichtigsten Bereiche der Informationstechnik. Es liefert wertvolle Hinweise auf Schwerpunkte einzelner Gebiete und Literaturhinweise für die Weiterarbeit. Berücksichtigt werden derzeit besonders wichtige Gebiete der Informationstechnik mit einem Akzent auf der digitalen Nachrichtentechnik.},
    }
  • L. Zimmermann, "Kooperationsprojekt C-PMSE - Cognitive Program Making and Special Events" in BICC OpenLabs, 2012. [Bibtex]
    @inproceedings{zimmermann2012,
    author  = {Zimmermann, Lars},
    title  = {Kooperationsprojekt C-PMSE - Cognitive Program Making and Special Events},
    booktitle  = {{BICC OpenLabs}},
    year  = {2012},
    month  = {02},
    location  = {Garching, DE},
    publisher  = {BICCnet Bavarian Information and Communication Technology Cluster},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1691},
    }
  • G. Fischer, "Frequency Agile RF Systems", 2012. [Bibtex]
    @other{fischer2012,
    author  = {Fischer, Georg},
    title  = {Frequency Agile RF Systems},
    booktitle  = {{}},
    year  = {2012},
    month  = {02},
    day  = {29},
    location  = {Dublin},
    keywords  = {Frequency Agile Radio,SDR,CR},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/900},
    }
  • [DOI] M. Kuba, M. Klatt, K. Ronge, and R. Weigel, "Automatic Communication Standard Recognition in Wireless Smart Home Networks" in IEEE Consumer Communications and Networking Conference (CCNC), 2012, 2012, pp. 270-274. [Bibtex]
    @inproceedings{kuba2012,
    author  = {Kuba, Matthias and Klatt, M. and Ronge, Karlheinz and Weigel, Robert},
    title  = {Automatic Communication Standard Recognition in Wireless Smart Home Networks},
    booktitle  = {{IEEE Consumer Communications and Networking Conference (CCNC), 2012}},
    year  = {2012},
    month  = {01},
    pages  = {270--274},
    doi  = {10.1109/CCNC.2012.6181100},
    location  = {Las Vegas, NV},
    keywords  = {embedded systems,feature extraction,home networks,internetworking,network servers,open systems,protocols,radio networks},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1324},
    abstract  = {Automatic recognition of communication standards is a crucial task, if universal interoperability between different communication systems is claimed. A gateway performing the recognition task can be used to interconnect heterogeneous systems with different and incompatible protocol waveforms. This paper proposes an algorithm for the automatic recognition of various communication standards used for wireless smart home networks in the European 868 MHz Short-Range Device frequency band. Relevant statistical key features are extracted from the received signal and the recognition is based on threshold comparison. The algorithm is appropriate for the implementation in low-complexity embedded systems and works over a wide range of signal-to-noise ratios (SNR).},
    }
  • J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Telemedicine at the example of sensor implants" in IEEE Radio and Wireless Symposium (RWS), 2012. [Bibtex]
    @inproceedings{walk2012,
    author  = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    title  = {Telemedicine at the example of sensor implants},
    booktitle  = {{IEEE Radio and Wireless Symposium (RWS)}},
    year  = {2012},
    month  = {01},
    day  = {15},
    location  = {Santa Clara, CA, USA},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/962},
    abstract  = {In recent years, much research has been devoted to the improvement of telemedicine. As an introduction of the workshop the first talk will review the basics of telemedicine and medical sensor applications. Central challenges and several system concepts will be introduced and their pros and cons will be discussed. Favorable health care needs completely imperceptible and maintenance free sensor devices. Especially long term monitoring sensors have to meet this requirement. A promising solution is an implantable sensor system. The permittivity of body tissue and the desired distance to a remote station confronts the technology with several challenges. In addition a local data platform will be presented, which has to realize the interaction between sensors and a cellular network.},
    }
  • [DOI] Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, "Efficiency Analysis of the Asymmetric 2-Level Outphasing PA with Rayleigh Enveloped Signals" in IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), 2012, pp. 85-88. [Bibtex]
    @inproceedings{abou-chahine2012,
    author  = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    title  = {Efficiency Analysis of the Asymmetric 2-Level Outphasing PA with Rayleigh Enveloped Signals},
    booktitle  = {{IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)}},
    year  = {2012},
    month  = {01},
    day  = {16},
    pages  = {85--88},
    doi  = {10.1109/PAWR.2012.6174930},
    location  = {Santa Clara, CA},
    keywords  = {optimisation,power amplifiers,Rayleigh amplitude distribution,Rayleigh enveloped signals,asymmetric 2-level outphasing PA,efficiency analysis,efficiency optimization,generalized asymmetric outphasing amplification,outphasing power amplifier,Bandwidth,Microwave circuits,Microwave communication,Modulation,Optimization,Peak to average power ratio,Outphasing architecture,RF PA,Rayleigh PDF,Wilkinson power combining,efficiency maximization},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1296},
    abstract  = {This paper focuses on the analysis of the generalized asymmetric outphasing amplification, yielding an expression for its combining efficiency. It also briefly reviews the outphasing power amplifier (PA) concept and interprets it from a functional perspective. The paper concludes with an analytical efficiency optimization for the 2-level asymmetric case with the transmitted signal having a Rayleigh amplitude distribution.},
    }
  • [DOI] E. Lourandakis, R. Weigel, H. Mextorf, and R. Knöchel, "Circuit Agility", IEEE Microwave Magazine, vol. 13, iss. 1, pp. 111-121, 2012. [Bibtex]
    @article{lourandakis2012,
    author  = {Lourandakis, Errikos and Weigel, Robert and Mextorf, Henning and Knöchel, Reinhard},
    title  = {Circuit Agility},
    journal  = {{IEEE Microwave Magazine}},
    year  = {2012},
    month  = {01},
    pages  = {111--121},
    issn  = {1527-3342},
    doi  = {10.1109/MMM.2011.2173987},
    publisher  = {IEEE},
    keywords  = {microwave circuits,network synthesis,power dividers,waveguide couplers,MEMS component,RF-transceiver subsystem,VCO,circuit agility,communication standard,ferroelectric varactor,frequency agile microwave subsystem,handheld communication device,handheld user device,integrated radio front-end architecture,matching network,microelectromechanical system component,microwave circuit,mobile communication,mobile radio,power amplifier,power coupler,power divider,radio-frequency-transceiver subsystem,semiconductor diode,semiconductor evolution,tunable passive component,voltage controlled oscillator,Agile manufacturing,Communication standards,Integrated circuit layout,Microwave circuits,Mobile communication,Power dividers,Radio spectrum management},
    volume  = {13},
    number  = {1},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1267},
    abstract  = {Over the last decade, mobile communication and its associated mass volume market has become one of the driving forces in the technology evolution of semiconductor and microwave circuits. For handheld communication devices, it is now mainstream to support increasing numbers of communication standards and localization services that occupy ever-expanding wide frequency ranges and bandwidths. At the same time, the physical dimensions of handheld user devices are shrinking, leading to even tighter specifications for the highly integrated front-end architectures of mobile radios. Todays radio front-end architectures use dedicated receive and transmit paths for each covered communication standard, thus the overall complexity and occupied area is increasing as well. The wide frequency allocation of the regulated communication bands along with the variety of standards, which have to be covered by these radios, calls for reconfigurable and frequency agile microwave subsystems. The scope of this article is to provide a comprehensive understanding of design principles for frequency agile and reconfigurable microwave circuits such as power dividers and couplers and how they can be used in radio-frequency (RF)-transceiver subsystems to pave the way toward reconfigurable radio front-end architectures. Introducing reconfigurability in microwave circuits is achieved by tunable passive components. Tunable passives can be implemented in a variety of technologies such as ferroelectric varactors, semiconductor diodes, and microelectromechanical systems (MEMS) components. Attractive applications for tunable circuits in the RF front end are tunable matching networks, filters, reconfigurable power amplifiers, tunable voltage controlled oscillator (VCO) circuits, and finally, couplers and dividers.},
    }
  • [DOI] J. Rascher, S. Pinarello, J. Müller, G. Fischer, and R. Weigel, "Highly linear robust RF switch with low insertion loss and high power handling capability in a 65nm CMOS technology" in 2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF), 2012, pp. 21-24. [Bibtex]
    @inproceedings{rascher2012,
    author  = {Rascher, Jochen and Pinarello, Sandro and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {Highly linear robust RF switch with low insertion loss and high power handling capability in a 65nm CMOS technology},
    booktitle  = {{2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF)}},
    year  = {2012},
    month  = {01},
    day  = {16},
    pages  = {21--24},
    isbn  = {978-1-4577-1317-0},
    doi  = {10.1109/SiRF.2012.6160157},
    location  = {Santa Clara, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/979},
    abstract  = {This work reports on the considerations for building RF switches in deeply scaled CMOS. As demonstrator single pole single throw (SPST) switches in a standard 65 nm technology are designed and measured. Goal of this design is lowest insertion loss while achieving high power handling capability, linearity, and robustness. For the novel design of switch variant Dev 1 0.8dB of insertion loss, 30dBm of power handling and an input third order intermodulation intercept point (iIP3) of 48.8 dBm has been achieved at 1.8 GHz. High robustness is achieved by stacking 4 transistors. Isolation at 1.8 GHz is better than 22dB. For high power handling capability in off state a method is implemented to rise the DC voltage level at inner nodes of the switch. Thus the threshold voltage lowering in deeply scaled CMOS can be counteracted. The small and large signal behaviour of the switch is compared to conventional designs and benefits are proven.},
    }
  • [DOI] M. Dudek, I. Nasr, D. Kissinger, R. Weigel, and G. Fischer, "The Impact of Antenna Characteristics on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications" in IEEE Radio Wireless Symposium (RWS), 2012, pp. 107-110. [Bibtex]
    @inproceedings{dudek2012,
    author  = {Dudek, Manuel and Nasr, Ismail and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {The Impact of Antenna Characteristics on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications},
    booktitle  = {{IEEE Radio Wireless Symposium (RWS)}},
    year  = {2012},
    month  = {01},
    pages  = {107--110},
    doi  = {10.1109/RWS.2012.6175357},
    location  = {Santa Clara (CA), USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/464},
    abstract  = {In this scientific paper a versatile system simulation environment is introduced that enables investigations on millimeter-wave FMCW-radar sensors. With respect to the latest developments in automotive radar the simulator combines an RF-frontend simulation engine and a 3D ray-tracing tool to take the effects of the radar channel into account. Furthermore different antenna characteristics can be generated by the phased-array radar topology implemented to examine not only the behavior of the RF-frontend but the impact of the concrete traffic situation on the whole sensor system. Therefore development engineers are actively assisted with their task to design new accurate and reliable systems, thus enabling the transition from current pure comfort systems to future systems including an increased number of safety functions. To demon-strate the usability of this advanced simulation approach for the development of future radar sensors a typical traffic scenario is calculated showing not only the impact of the antennas’ beamwidth and side-lobes on target signal detection, but also the performance of the simulation environment built-up.},
    }
  • [DOI] A. Koelpin, S. Lindner, G. Vinci, B. Lämmle, and R. Weigel, "The Enhanced Six-Port Architecture: A Measurement Based Proof of Concept" in IEEE Topical Meeting on Wireless Sensors and Sensor Networks, 2012, pp. 29-32. [Bibtex]
    @inproceedings{koelpin2012,
    author  = {Koelpin, Alexander and Lindner, Stefan and Vinci, Gabor and Lämmle, Benjamin and Weigel, Robert},
    title  = {The Enhanced Six-Port Architecture: A Measurement Based Proof of Concept},
    booktitle  = {{IEEE Topical Meeting on Wireless Sensors and Sensor Networks}},
    year  = {2012},
    month  = {01},
    pages  = {29--32},
    doi  = {10.1109/WiSNet.2012.6172143},
    location  = {Santa Clara},
    keywords  = {enhanced six-port,microwave circuit},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/939},
    abstract  = {In this publication the concept of the enhanced six-port receiver is proven by measurements of a hardware demonstrator. The enhanced six-port architecture has been proposed for simultaneous data reception and angle of arrival estimation with only one receiver front-end. It offers high positioning accuracy and high bandwidth combined with low circuit complexity. Up to now the concept has only been introduced and validated by system simulations. In this publication measurements of a hardware setup will be presented for the first time proving the functionality and performance of this new and promising architecture.},
    }
  • [DOI] I. Nasr, B. Lämmle, H. Knapp, G. Fischer, R. Weigel, and D. Kissinger, "A wide tuning range high output power 56-74 GHz VCO with on-chip transformer load in SiGe technology" in IEEE Topical Meeting Silicon Monolithic Integrated Circuits in RF Systems Digest, 2012, pp. 49-52. [Bibtex]
    @inproceedings{nasr2012,
    author  = {Nasr, Ismail and Lämmle, Benjamin and Knapp, Herbert and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A wide tuning range high output power 56-74 GHz VCO with on-chip transformer load in SiGe technology},
    booktitle  = {{IEEE Topical Meeting Silicon Monolithic Integrated Circuits in RF Systems Digest}},
    year  = {2012},
    month  = {01},
    day  = {16},
    pages  = {49--52},
    isbn  = {978-1-4577-1317-0},
    doi  = {10.1109/SiRF.2012.6160130},
    location  = {Santa Clara, CA, USA},
    publisher  = {IEEE},
    keywords  = {VCO,Transformer,Frequency Dividers,Colpitts,FMCW},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/964},
    abstract  = {This paper presents a wide tuning range modified Colpitts VCO with high output power. The circuit was fabricated using a lowcost SiGe technology with an ft/fmax of 170/250 GHz. The VCO can be tuned between 56.4 and 73.8 GHz having a tuning range of approx. 27\%. The maximum measured output power is +9.4 dBm, and the output power remains above +7.0 dBm over the entire tuning range. The VCO has a minimum phase noise of -95 dBc/Hz, which stays below -88 dBc/Hz over the entire tuning range. On-chip frequency dividers were used to enable easier measurement. A single transformer was designed and used simultaneously for output matching of the VCO and as an output balun. The overall chip draws 112 mA from a 3.3 V supply, where the VCO draws 45 mA of the total current.},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, D. Kissinger, and R. Weigel, "A 62 GHz reflectometer for biomedical sensor readout in SiGe BiCMOS technology" in IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, 2012, pp. 45-48. [Bibtex]
    @inproceedings{laemmle2012,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar and Weigel, Robert},
    title  = {A 62 GHz reflectometer for biomedical sensor readout in SiGe BiCMOS technology},
    booktitle  = {{IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems}},
    year  = {2012},
    month  = {01},
    pages  = {45--48},
    location  = {Santa Clara, CA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1155},
    }
  • [DOI] G. Vinci, B. Lämmle, F. Barbon, R. Weigel, and A. Koelpin, "A 77 GHz Direction of Arrival Detector System with SiGe Integrated Six-Port Receiver" in Radio-Wireless Symposium (RWS) 2012, 2012, pp. 247-250. [Bibtex]
    @inproceedings{vinci2012a,
    author  = {Vinci, Gabor and Lämmle, Benjamin and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A 77 GHz Direction of Arrival Detector System with SiGe Integrated Six-Port Receiver},
    booktitle  = {{Radio-Wireless Symposium (RWS) 2012}},
    year  = {2012},
    month  = {01},
    day  = {15},
    pages  = {247--250},
    isbn  = {978-1-4577-1153-4},
    doi  = {10.1109/RWS.2012.6175346},
    location  = {Santa Clara, CA, USA},
    publisher  = {IEEE},
    keywords  = {Antenna measurements,Antennas,Automotive engineering,Detectors,Microstrip,Radar,Receivers},
    number  = {12639686},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1026},
    abstract  = {In this publication the design of a 77 GHz Direction-Of-Arrival (DOA) detector system with an Integrated SiGe six-port receiver and a passive microstrip antenna network is presented. The introduction of the six-port receiver for industrial sensors and automotive radar applications has opened a whole new set of possibilities and implementations. A typical problem though of Millimeter-Wave (MW) integration is the interface between the on-chip circuitry and the off-chip system electronics or passives. The antenna design aspects and interconnections are presented with a layouting analysis as well as a system overview of the DOA detector for a flexible, low-complexity and low-cost solution in microstrip technology.},
    }
  • [DOI] R. Weigel, A. Hartmann, R. Strzoda, and R. Schrobenhauser, "Arithmetical elimination of superimposed interference modulation in laser spectroscopic gas concentration measurements" in European Conference on Solid-State Transducers, EUROSENSOR 2012, 2012, pp. 1350-1353. [Bibtex]
    @inproceedings{weigel2012,
    author  = {Weigel, Robert and Hartmann, Alexander and Strzoda, Rainer and Schrobenhauser, Robert},
    title  = {Arithmetical elimination of superimposed interference modulation in laser spectroscopic gas concentration measurements},
    booktitle  = {{European Conference on Solid-State Transducers, EUROSENSOR 2012}},
    year  = {2012},
    pages  = {1350--1353},
    doi  = {10.1016/j.proeng.2012.09.406},
    location  = {Krakau, PL},
    keywords  = {Gas concentration,interference,fringe,rejection,elimination},
    volume  = {47},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1575},
    abstract  = {A method for an arithmetical elimination of superimposed interference fringe modulations in laser spectroscopic sensor signals has been developed. It is based on analyzing the harmonic components of the Fourier spectrum calculated from the measured signal. The technique is especially suited for remote measurements including fringes with unknown modulation frequency. The effectiveness of the method is demonstrated by comparison of the results with classic least-square calculations of the gas concentration signal.},
    }
  • [DOI] M. Pour Mousavi, M. Wojnowski, K. Pressel, G. Sommer, and R. Weigel, "Passive components using quasi-CPW in eWLB package" in International Microwave Radar and Wireless Communications Symposium (MIKON), 2012. [Bibtex]
    @inproceedings{pourmousavi2012,
    author  = {Pour Mousavi, Mehran and Wojnowski, Maciej and Pressel, Klaus and Sommer, Grit and Weigel, Robert},
    title  = {Passive components using quasi-CPW in eWLB package},
    booktitle  = {{International Microwave Radar and Wireless Communications Symposium (MIKON)}},
    year  = {2012},
    doi  = {10.1109/MIKON.2012.6233595},
    location  = {Poland},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1112},
    }
  • M. Hofmann, M. Bloss, R. Weigel, G. Fischer, and D. Kissinger, "Non-Invasive Glucose Monitoring Using Open Electromagnetic Waveguides" in EuMA European Microwave Conference, 2012. [Bibtex]
    @inproceedings{hofmann2012b,
    author  = {Hofmann, Maximilian and Bloss, M. and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {Non-Invasive Glucose Monitoring Using Open Electromagnetic Waveguides},
    booktitle  = {{EuMA European Microwave Conference}},
    year  = {2012},
    location  = {Amsterdam},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1088},
    abstract  = {This paper presents a novel approach towards noninvasive glucose measurement. The introduced concept is based on an electromagnetic (EM) wave transmission along blood vessels. Theoretical investigation of a TEM wave propagation through a aqueous glucose solution is shown. The concept was evaluated by a simplified demonstrator which consists of a dielectric covered TEM-Waveguide. A 3D field simulation of the structure has been performed with a glucose dependent Debye relaxation model. The EM waveguide was fabricated and measured with various glucose concentrations. A phase difference of 12 deg for a 500mg/dl variation in glucose concentration was measured at 20GHz.},
    }
  • [DOI] M. Hofmann, F. Trenz, R. Weigel, G. Fischer, and D. Kissinger, "A Microwave Sensing System for Aqueous Concentration Measurements based on a Microwave Reflectometer" in IEEE International Microwave Symposium, 2012. [Bibtex]
    @inproceedings{hofmann2012c,
    author  = {Hofmann, Maximilian and Trenz, Florian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Microwave Sensing System for Aqueous Concentration Measurements based on a Microwave Reflectometer},
    booktitle  = {{IEEE International Microwave Symposium}},
    year  = {2012},
    doi  = {10.1109/MWSYM.2012.6259771},
    location  = {Montreal},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1085},
    abstract  = {This paper presents a novel parameterized De- bye relaxation model for aqueous glucose solutions up to 40 GHz. The influence on all Debye relaxation parameters is given by three equations. A compact microwave demon- strator for concentration measurements, consisting of two directional couplers, a voltage controlled oscillator (VCO), a six-port-junction, power detectors and a signal processing board is introduced. A hybrid calibration procedure for the reflectometer based approach is applied, based on a linear five standard calibration and a three standard error-box model, respectively.},
    }
  • M. Hofmann, "Cardiopulmonary-Resuscitation Feedback Simulation" in CST European User Conference, 2012. [Bibtex]
    @inproceedings{hofmann2012d,
    author  = {Hofmann, Maximilian},
    title  = {Cardiopulmonary-Resuscitation Feedback Simulation},
    booktitle  = {{CST European User Conference}},
    year  = {2012},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1094},
    abstract  = {A cardiopulmonary resuscitation feedback system must measure the compression depth and rate to ensure a sufficient cardiac massage. This contribution presents a novel approach to CPR measurement systems. The introduced concept evaluates the compression depth and rate with two antennas which are coupled through the thorax. For this reason, different 3D thorax models (deformable) were investigated and simulated with four different antenna pairs. The antennas are centered between 868 MHz and 2.4 GHz and matched to the upper skin layer impedance. The simulation results are evaluated in animal and human experiments finally.},
    }
  • M. Hofmann, J. Edelmann, A. Bolz, R. Weigel, G. Fischer, and D. Kissinger, "RF Based Feedback System for Cardiopulmonary Resuscitation" in German Microwave Conference (GeMiC), 2012. [Bibtex]
    @inproceedings{hofmann2012a,
    author  = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Bolz, Armin and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {RF Based Feedback System for Cardiopulmonary Resuscitation},
    booktitle  = {{German Microwave Conference (GeMiC)}},
    year  = {2012},
    location  = {Ilmenau},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1084},
    abstract  = {This paper presents a novel approach to cardiopulmonary resuscitation (CPR) feedback. The underlying concept is based on an RF transmission through the thorax. With the help of CT images, the link budget has been estimated and verified via a full 3D EM simulation of a human body model. Different antennas and operating frequencies between 868MHz and 2.4 GHz were investigated regarding the ability to assist a CPR. The fabricated antennas were matched to the thorax impedance and have been evaluated in animal and selfexperiments. It is shown, that the thorax compression during a CPR can be monitored with the proposed RF based approach.},
    }
  • [DOI] M. Hofmann, J. Edelmann, A. Bolz, R. Weigel, G. Fischer, and D. Kissinger, "RF Based Feedback System for Cardiopulmonary Resuscitation" in IEEE BioWireless - Radio Wireless Week, 2012. [Bibtex]
    @inproceedings{hofmann2012,
    author  = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Bolz, Armin and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {RF Based Feedback System for Cardiopulmonary Resuscitation},
    booktitle  = {{IEEE BioWireless - Radio Wireless Week}},
    year  = {2012},
    doi  = {10.1109/BioWireless.2012.6172738},
    location  = {Santa Clara (CA)},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1086},
    abstract  = {This paper presents a novel approach to cardiopulmonary resuscitation (CPR) feedback. The underlying concept is based on an RF transmission through the thorax. With the help of CT images, the link budget has been estimated and verified via a full 3D EM simulation of a human body model. Different antennas and operating frequencies between 868MHz and 2.4 GHz were investigated regarding the ability to assist a CPR. The fabricated antennas were matched to the thorax impedance and have been evaluated in animal and selfexperiments. It is shown, that the thorax compression during a CPR can be monitored with the proposed RF based approach.},
    }
  • [DOI] A. Hartmann, R. Strzoda, and R. Weigel, "Automatic identification of wavelength range of VCSEL based gas sensor using ratios of gas absorption lines", Applied Physics B: Lasers and Optics, vol. 110, iss. 2, pp. 195-202, 2012. [Bibtex]
    @article{hartmann2012,
    author  = {Hartmann, Alexander and Strzoda, Rainer and Weigel, Robert},
    title  = {Automatic identification of wavelength range of VCSEL based gas sensor using ratios of gas absorption lines},
    journal  = {{Applied Physics B: Lasers and Optics}},
    year  = {2012},
    pages  = {195--202},
    issn  = {1432-0649},
    doi  = {10.1007/s00340-012-5048-z},
    publisher  = {Springer-Verlag},
    volume  = {110},
    number  = {2},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1143},
    abstract  = {In this paper a method for identifying the wavelength range of a tunable vertical cavity surface-emitting laser (VCSEL) is introduced. The measuring technology is wavelength modulation spectroscopy (WMS). The laser is tuned over its wavelength by applying a temperature ramp using the onboard Peltier element. During this ramp the 2f absorption lines are recorded. After finishing the temperature ramp and collecting the lines, a ratio-compare algorithm calculates the theoretical amplitudes of selected predefined lines. Then it compares the measured 2f line amplitudes iteratively with the theoretical ones. If the error of the ratios of the calculated and the measured lines is below a predefined limit, the searched lines and hence the emission wavelength are identified.},
    }
  • M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A Low Power SiGe HBT LNA For UWB Applications" in German Microwave Conference, 2012. [Bibtex]
    @inproceedings{hamouda2012a,
    author  = {Hamouda, Mohammed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Low Power SiGe HBT LNA For UWB Applications},
    booktitle  = {{German Microwave Conference}},
    year  = {2012},
    location  = {Ilmenau, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/976},
    abstract  = {A low noise amplifier (LNA) is implemented in this work for ultra wide band (UWB) localization and sensing systems within a wide frequency range starting from 400MHz and up to 10GHz. The topology used is a resistive shunt feedback and a peaking inductance in series with the output transistor to achieve the desired bandwidth and have better noise performance. The LNA is fabricated in low cost 0.25μm 92GHz fmax SiGe-HBT BiCMOS process technology. The area of the manufactured chip is 0.73mm2. The achieved gain is 12dB with a NF less than 3.7dB over the entire frequency range while the consumed power is only 14.5mW.},
    }
  • [DOI] M. Hamouda, J. Sachs, T. Ußmüller, G. Fischer, and R. Weigel, "High Precision Wireless Synchronization Receiver for M-Sequence UWB Radio Systems" in Internation Conference on Ultra-wide Band 2012, 2012. [Bibtex]
    @inproceedings{hamouda2012,
    author  = {Hamouda, Mohammed and Sachs, Jürgen and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    title  = {High Precision Wireless Synchronization Receiver for M-Sequence UWB Radio Systems},
    booktitle  = {{Internation Conference on Ultra-wide Band 2012}},
    year  = {2012},
    doi  = {10.1109/ICUWB.2012.6340420},
    location  = {Syracuse, NewYork, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/977},
    abstract  = {This work deals with M-sequence UWB Radio architectures for high-precision indoor localization and low data rate radio transmission. So far, UWB M-sequence devices were only used in Radar mode which applies wired synchronization between transmitter and receiver. Radio systems have different architecture since receiver and transmitter are spatially separated from each other. This paper focuses on the phase and frequency synchronization between the clock of the transmitter and receiver. The proposed architecture deals with 10 gigachips per second achieving a high frequency bandwidth ranging from DC upto 5GHz or consequently from 5GHz to 15GHz depending on the device structure. It is very costly and power demanding to process such signals in the digital domain to perform the synchronization. Thus, a low power and low cost technique is introduced using analog blocks for the synchronization achieving a maximum error of 5ps.},
    }
  • [DOI] A. Götz, R. Rose, S. Zorn, G. Fischer, and R. Weigel, "Performance of Coherent Time Delay Estimation Techniques for Frequency Hopping GSM Signals" in Topical Conference on Wireless Sensors and Sensor Networks (RWW / WiSNet), 2012, pp. 25-28. [Bibtex]
    @inproceedings{goetz2012,
    author  = {Götz, Alexander and Rose, Richard and Zorn, Stefan and Fischer, Georg and Weigel, Robert},
    title  = {Performance of Coherent Time Delay Estimation Techniques for Frequency Hopping GSM Signals},
    booktitle  = {{Topical Conference on Wireless Sensors and Sensor Networks (RWW / WiSNet)}},
    year  = {2012},
    pages  = {25--28},
    doi  = {10.1109/WiSNet.2012.6172142},
    location  = {Santa Clara, California, USA},
    keywords  = {GSM,TDOA,Localization,Frequency Hopping},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/970},
    abstract  = {In this paper, the performance of coherent time delay estimation techniques for frequency hopping GSM signals is investigated. It is demonstrated that the techniques enable the usage of a substantially higher bandwidth for time delay estimation and localization purposes compared to state-of-the-art techniques. Since resolution and noise performance directly depend on the applied bandwidth of the signals, major improvements can be realized. For E-GSM 900 systems, an overall bandwidth of up to 35 MHz may be used which enables time delay estimation and localization in the scale of a few meters. The coherent time delay estimation techniques are therefore ideally suited for search and rescue applications.},
    }
  • [DOI] V. Chauhan, J. Gupta, and C. Singla, "Proposed Mobile Controlled Handoff (MCHO) in 3GPP Long Term Evolution (LTE) system" in Springer's 5th International Conference on Contemporary Computing, 2012, pp. 294-305. [Bibtex]
    @inproceedings{chauhan2012,
    author  = {Chauhan, Vikrant and Gupta, Juhi and Singla, Chhavi},
    title  = {Proposed Mobile Controlled Handoff (MCHO) in 3GPP Long Term Evolution (LTE) system},
    booktitle  = {{Springer's 5th International Conference on Contemporary Computing}},
    year  = {2012},
    pages  = {294--305},
    issn  = {1865-0929},
    doi  = {10.1007/978-3-642-32129-0_32},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1899},
    }
  • C. Spratler, P. Hugelmann, and R. Weigel, "Fluessigmetallschleifkontakte in der EMV" in Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit, 2012. [Bibtex]
    @inproceedings{spratler2012,
    author  = {Spratler, Christian and Hugelmann, P. and Weigel, Robert},
    title  = {Fluessigmetallschleifkontakte in der EMV},
    booktitle  = {{Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit}},
    year  = {2012},
    location  = {Duesseldorf, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1571},
    }
  • J. Nehring, M. Hofmann, C. Münker, R. Weigel, G. Fischer, and D. Kissinger, "A Universal Method for the Design and Synthesis of Wideband Directional Couplers using Non-Uniform Coupled Transmission Lines" in IEEE European Microwave Conference, 2012. [Bibtex]
    @inproceedings{nehring2012,
    author  = {Nehring, Johannes and Hofmann, Maximilian and Münker, Christian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A Universal Method for the Design and Synthesis of Wideband Directional Couplers using Non-Uniform Coupled Transmission Lines},
    booktitle  = {{IEEE European Microwave Conference}},
    year  = {2012},
    location  = {Amsterdam, The Netherlands},
    publisher  = {IEEE},
    keywords  = {wideband directional coupler,wideband,coupler,non-uniform},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/978},
    abstract  = {In this paper a complete procedure for the design, synthesis and construction of wideband directional couplers is presented. Cascading multiple quarter-wavelength line segments leads to an increase of coupling bandwidth up to 180\% but also results in discontinuities of geometry and thus in strong reflec- tions. Furthermore, the isolation is diminished. To avoid these effects a design technique for the generation of continous, non-uniform geometries is analyzed and implemented. Two methods for the coupler synthesis are proposed and compared. One is an approximational approach and uses two sets of equations. The other uses accurate 2D field simulation of the propagating modes and is universally applicable to any kind of coupled transmission lines. The completely synthesized couplers are simulated in CST Microwave Studio and achieve very good results for coupling, isolation and return loss. A nominal -10dB wideband coupler at a center frequency of 15GHz and a nominal bandwidth of 164\% is built in a multilayer stackup. Good agreement between measurement and simulation results is observed.},
    }
  • [DOI] M. Maser, G. Fischer, R. Weigel, and T. Ußmüller, "An Integrated SiGe Bipolar VCO with Linearized Tuning Behavior and Ultra-Wide Tuning Range for UWB FMCW Local Positioning Systems" in 2012 International Semiconductor Conference Dresden - Grenoble, 2012. [Bibtex]
    @inproceedings{maser2012,
    author  = {Maser, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {An Integrated SiGe Bipolar VCO with Linearized Tuning Behavior and Ultra-Wide Tuning Range for UWB FMCW Local Positioning Systems},
    booktitle  = {{2012 International Semiconductor Conference Dresden - Grenoble}},
    year  = {2012},
    doi  = {10.1109/ISCDG.2012.6359998},
    location  = {Grenoble, France},
    publisher  = {IEEE},
    keywords  = {FMCW-radar,negative inductance,SiGe Bipolar,tuning linearization,ultra-wide continuous tuning range,voltage controlled oscillator},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/999},
    abstract  = {This paper describes an integrated voltage controlled oscillator (VCO) with linearized tuning behavior for ultra-wideband local positioning radar applications. The VCO is LC-resonator based and uses a tunable negative inductance cell (NI-cell) in conjunction with a differential junction varactor to achieve an ultra-wide, continuous frequency tuning range (FTR). A tuning linearization circuit is used to couple both tuning mechanisms to attain a more constant tuning sensitivity (K_VCO). The presented VCO offers a measured FTR from f_min = 3.365 GHz to f_max = 7.677 GHz. The tuning curve is linearized in a frequency range of 2.1 GHz with a measured K_VCO-deviation of only +/-10\% around K_VCO = 775 MHz/V, which corresponds to a relative FTR of 34\%.},
    }
  • D. Kissinger, Millimeter-Wave Receiver Concepts for 77 GHz Automotive Radar in Silicon-Germanium Technology, Springer-Verlag, 2012.. [Bibtex]
    @book{kissinger2012,
    author  = {Kissinger, Dietmar},
    title  = {Millimeter-Wave Receiver Concepts for 77 GHz Automotive Radar in Silicon-Germanium Technology},
    booktitle  = {{}},
    year  = {2012},
    location  = {New York},
    publisher  = {Springer-Verlag},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/960},
    }
  • [DOI] T. Lautenbacher, R. Mzyk, R. Weigel, G. Fischer, and A. Koelpin, "High-Q Split Ring Resonators for Tuning and Balun Applications" in Microwave and Radar Week MRW 2012 Warschau, 2012. [Bibtex]
    @inproceedings{lautenbacher2012,
    author  = {Lautenbacher, Thomas and Mzyk, Raphael and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    title  = {High-Q Split Ring Resonators for Tuning and Balun Applications},
    booktitle  = {{Microwave and Radar Week MRW 2012 Warschau}},
    year  = {2012},
    doi  = {10.1109/MIKON.2012.6233484},
    location  = {Warschau, Polen},
    keywords  = {Split Ring Resonator,High-Q,Suspended Stripline,tuning,RF MEMS,varactor,balun,reconstruction filter},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/987},
    abstract  = {High-Q planar filters based on split ring resonators (SRRs) in suspended stripline technology (SSL) are investigated concerning different purposes. Initially, the SRR is analyzed regarding possibilities for optimization of quality factor Q. Beside this, the tuning potential of SRRs is explained. Therefore, an RF MEMS varactor is introduced together with an examination of its potential coupling methods to the SRR. Furthermore, the incorporation of the functionalities filter and balanced-to-unbalanced transformer (Balun) using one SRR is shown. The introduced concepts are proven by simulations and practical demonstrations.},
    }
  • [DOI] C. Blümm, C. Heller, and R. Weigel, "Robust Time and Frequency Synchronization for OFDM Systems with Maximum Spectrum Flexibility" in IEEE Topical Conference of Antennas and Propagation in Wireless Communications, 2012, pp. 856-860. [Bibtex]
    @inproceedings{bluemm2012a,
    author  = {Blümm, Christian and Heller, Christoph and Weigel, Robert},
    title  = {Robust Time and Frequency Synchronization for OFDM Systems with Maximum Spectrum Flexibility},
    booktitle  = {{IEEE Topical Conference of Antennas and Propagation in Wireless Communications}},
    year  = {2012},
    pages  = {856--860},
    doi  = {10.1109/APWC.2012.6324940},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1853},
    }

2011

  • J. Rascher, S. Pinarello, J. Müller, G. Fischer, and R. Weigel, "Methods for Low Insertion Loss RF Switches with Increased Power Handling Capability in 65nm CMOS" in Asia-Pacific Microwave Conference 2011 (APMC 2011), 2011, pp. 1897-1900. [Bibtex]
    @inproceedings{rascher2011a,
    author  = {Rascher, Jochen and Pinarello, Sandro and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    title  = {Methods for Low Insertion Loss RF Switches with Increased Power Handling Capability in 65nm CMOS},
    booktitle  = {{Asia-Pacific Microwave Conference 2011 (APMC 2011)}},
    year  = {2011},
    month  = {12},
    pages  = {1897--1900},
    location  = {Melbourne, Australia},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/980},
    abstract  = {This work reports on methods and dependencies for the design of low insertion loss single pole single throw (SPST) switches in 65nm CMOS with triple well transistors. Two different switch types are investigated and implemented. The series switch has less than 1dB insertion loss at 1.8GHz and a 1dB input compression point (P1dB) of 28.8dBm. The shunt switch has less than 0.4dB insertion loss at 1.8GHz and a P1dB of 29.1dBm. Isolation of the series and shunt switches at 1.8GHz is better than 21dB and 20dB, respectively. By applying a resistive body floating technique low insertion loss and increased power handling capability are achieved. At the shunt switch negative gate bias is adopted for improved P1dB. At the series switch a method is implemented to boost the DC voltage level at source/ drain nodes of transistors for improved power handling capability in off state without additional circuitry or any DC power consumption. The combination of these methods andan additional DC voltage in on state increases power handling capability in both states of the switch.},
    }
  • [DOI] T. Su, M. Unger, T. Steinecke, and R. Weigel, "Degradation of the Conducted Radio Frequency Immunity of Microcontrollers Due to Electromagnetic Resonances in Foot-Point Loops", IEEE Transactions on Electromagnetic Compatibility, vol. 54, iss. 4, pp. 772-784, 2011. [Bibtex]
    @article{su2011a,
    author  = {Su, Tao and Unger, Markus and Steinecke, Thomas and Weigel, Robert},
    title  = {Degradation of the Conducted Radio Frequency Immunity of Microcontrollers Due to Electromagnetic Resonances in Foot-Point Loops},
    journal  = {{IEEE Transactions on Electromagnetic Compatibility}},
    year  = {2011},
    month  = {12},
    day  = {20},
    pages  = {772--784},
    issn  = {0018-9375},
    doi  = {10.1109/TEMC.2011.2178098},
    publisher  = {IEEE},
    keywords  = {Electromagnetic compatibility,electromagnetic interference (EMI),integrated circuits (ICs),microcontrollers,oscillators},
    volume  = {54},
    number  = {4},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1298},
    abstract  = {The response of the microcontrollers to conducted radio frequency interference depends strongly on the frequency of the interference signals. As a symbol of the strong frequency dependence, dips appear on the immunity-frequency curve of the microcontrollers. This paper discovers that some of the immunity dips are due to resonances in the current loops through the input and output pins of the oscillator amplifier. Those dips are called foot-point immunity dips. With theoretical analysis, measurements, simulations, and optimizations, this paper gives a systematic description and treatment on the foot-point immunity dips.},
    }
  • M. Jung, J. Fuhrmann, A. Ferizi, G. Fischer, R. Weigel, and T. Ußmüller, "Design of a 12 ghz low-power extended true single phase clock (e-tspc) prescaler in 0.13 um cmos technology" in Asia-Pacific Microwave Conference, 2011, pp. 1238-1241. [Bibtex]
    @inproceedings{jung2011d,
    author  = {Jung, Melanie and Fuhrmann, Jörg and Ferizi, Alban and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Design of a 12 ghz low-power extended true single phase clock (e-tspc) prescaler in 0.13 um cmos technology},
    booktitle  = {{Asia-Pacific Microwave Conference}},
    year  = {2011},
    month  = {12},
    pages  = {1238--1241},
    isbn  = {978-1-4577-2034-5},
    location  = {Melbourne, VIC},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1287},
    }
  • S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector" in A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector, 2011, pp. 1-4. [Bibtex]
    @inproceedings{glock2011a,
    author  = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector},
    booktitle  = {{A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector}},
    year  = {2011},
    month  = {12},
    day  = {06},
    pages  = {1--4},
    location  = {Melbourne, Australia},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/955},
    abstract  = {This paper introduces a power-aware behavioral modeling approach for analog components. A Verilog-A behavioral model, which considers the component’s current consumption, is created using circuit information obtained from transistorlevel simulation. Therefore, the model features high accuracy with the benefit of low computational effort. The concept can be applied to any analog component and enables the simulation of complex analog systems. The approach is practically applied to the design of a phase-frequency detector, which determines important characteristics of a PLL.},
    }
  • P. Jüschke, J. Brendel, G. Fischer, and A. Pascht, "Feed-forward neural networks for analog impairment mitigation in high power RF transceivers" in Asia-Pacific Microwave Conference (APMC), 2011, pp. 1650-1653. [Bibtex]
    @inproceedings{jueschke2011,
    author  = {Jüschke, Patrick and Brendel, Johannes and Fischer, Georg and Pascht, Andreas},
    title  = {Feed-forward neural networks for analog impairment mitigation in high power RF transceivers},
    booktitle  = {{Asia-Pacific Microwave Conference (APMC)}},
    year  = {2011},
    month  = {12},
    pages  = {1650--1653},
    issn  = {2165-4727},
    location  = {Melbourne, Australia},
    publisher  = {IEEE},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6174084},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/983},
    abstract  = {Constantly rising capacity and increasing complexity of mobile communication systems as well as the general demand to reduce the power consumption to get the systems greener, are a big challenge especially for radio frontends. Complex modulated signals of mobile communication standards like LTE have high demands on radio frontends regarding signal requirements. the numerous variety of different standards in different frequency bands have further demands on radio transceivers and its architecture. Flexible radios, suitable for different standards, signals and frequencies with highest efficiency and dynamic are required. This paper shows possibilities to enhance the flexibility of RF transceivers and how to enable future standards and handle high requirements while relaxing configuration using neural networks for signal processing in RF transceivers.},
    }
  • [DOI] M. Wojnowski, R. Lachner, J. Böck, C. Wagner, F. Starzer, G. Sommer, K. Pressel, and R. Weigel, "Embedded Wafer Level Ball Grid Array (eWLB) Technology for Millimeter-Wave Applications" in IEEE 13th Electronics Packaging Technology Conference (EPTC), 2011, pp. 423-429. [Bibtex]
    @inproceedings{wojnowski2011,
    author  = {Wojnowski, Maciej and Lachner, Rudolf and Böck, Josef and Wagner, Christoph and Starzer, Florian and Sommer, Grit and Pressel, Klaus and Weigel, Robert},
    title  = {Embedded Wafer Level Ball Grid Array (eWLB) Technology for Millimeter-Wave Applications},
    booktitle  = {{IEEE 13th Electronics Packaging Technology Conference (EPTC)}},
    year  = {2011},
    month  = {12},
    day  = {08},
    pages  = {423--429},
    isbn  = {978-1-4577-1981-3},
    doi  = {10.1109/EPTC.2011.6184458},
    location  = {Singapore, SG},
    keywords  = {Ge-Si alloys,ball grid arrays,dipole antennas,microwave integrated circuits,millimetre wave integrated circuits,radio transceivers,system-in-package,transmission lines,wafer level packaging,LC tank,SiGe,antenna integration,compact chip package board transition,differential transmission line,dipole antennas,down converter circuit,eWLB technology,embedded wafer level ball grid array,frequency 17 GHz,frequency 18 GHz,frequency 77 GHz,millimeter wave applications,single chip four channel transceiver,single ended transmission line,system-in-package,thin film redistribution layer,Attenuation,Coplanar waveguides,Dipole antennas,Inductors,Insertion loss,Transmission line measurements,Electronics packaging},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1270},
    abstract  = {The embedded wafer level ball grid array (eWLB) is a novel packaging technology that shows excellent performance for millimeter-wave (mm-wave) applications. We present simulation and measurement results of single-ended and differential transmission lines realized using the thin-film redistribution layers (RDL) of an eWLB. We demonstrate the capabilities for the integration of passives on example of a configurable 17/18 GHz down-converter circuit realized in silicon-germanium (SiGe) technology with a fan-in eWLB differential inductor used for the LC tank. We compare the performance of differential chip-package-board transitions realized in an eWLB and in other common package types. We report an optimized compact chip-package-board transition in the eWLB. We obtain a simulated insertion loss as low as -0.65 dB and a return loss below -16 dB at 77 GHz without external matching networks. We introduce the concept of antenna integration in the eWLB and show examples of single-ended and differential antenna structures. Finally, we present for the first time a single-chip four-channel 77 GHz transceiver in SiGe integrated in the eWLB package together with four dipole antennas. The presented examples demonstrate that the eWLB technology is an attractive candidate for mm-wave applications including system-in-package (SiP).},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "A Versatile System Simulation Environment for Millimeter-Wave Phased-Array FMCW-Radar Sensors for Automotive Applications" in Asia-Pacific Microwave Conference (APMC), 2011, pp. 1478-1481. [Bibtex]
    @inproceedings{dudek2011f,
    author  = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {A Versatile System Simulation Environment for Millimeter-Wave Phased-Array FMCW-Radar Sensors for Automotive Applications},
    booktitle  = {{Asia-Pacific Microwave Conference (APMC)}},
    year  = {2011},
    month  = {12},
    pages  = {1478--1481},
    location  = {Melbourne, Australia},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/463},
    abstract  = {In this contribution a versatile system simulation environment for radar sensors being developed to operate in the automotive area is introduced. It combines a frontend simulation engine that is coupled in a co-simulation with a 3D ray-tracing tool to take the effects of the automotive radar channel into account, thus providing accurate and reliable results concerning the behavior of the implemented circuits in certain traffic situations. With respect to the latest developments in automotive radar, i.e. the transition from former comfort systems to current systems including an increased number of safety functions, the system simulation environment has been extended to support investigations on the phased-array radar principle. Applying this technique in the automotive area promises advantages in target detection in the vehicles vicinity by the means of increased hardware requirements, resulting in radar systems that are by far more difficult to design due to the number of side-effects that have to be additionally considered during the development process. To demonstrate the capability of this advanced simulation approach a typical traffic scenario is calculated showing not only the advantages of phased-array radar for the automotive field but also the performance of the simulation environment built up.},
    }
  • J. Brendel, "C-PMSE – Signal detection & scanning network" in Öffentlicher Workshop des C-PMSE Projekts, 2011. [Bibtex]
    @inproceedings{brendel2011,
    author  = {Brendel, Johannes},
    title  = {C-PMSE – Signal detection & scanning network},
    booktitle  = {{Öffentlicher Workshop des C-PMSE Projekts}},
    year  = {2011},
    month  = {12},
    day  = {07},
    location  = {Berlin, Germany},
    note  = {Presented},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/986},
    }
  • S. Zeller, C. Münker, and R. Weigel, "Ein zeitkontinuierlicher Sigma-Delta-Wandler neunter Ordnung mit neuartigen kreuzgekoppelten Resonatoren" in ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2011. [Bibtex]
    @inproceedings{zeller2011b,
    author  = {Zeller, Sebastian and Münker, Christian and Weigel, Robert},
    title  = {Ein zeitkontinuierlicher Sigma-Delta-Wandler neunter Ordnung mit neuartigen kreuzgekoppelten Resonatoren},
    booktitle  = {{ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2011},
    month  = {11},
    location  = {Erlangen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1550},
    abstract  = {Zeitkontinuierliche Σ-Δ-A/D-Wandler werden gewoehnlich mit Noise Transfer Functions (NTF) entworfen, die konjugiert komplexe Nullstellen beinhalten, um die nutzbare Bandbreite zu erhoehen. Traditionell werden diese Nullstellen durch Resonanzen erzeugt, die durch Rückkopplung über zwei integrierende Operationsverstärker (OPV) hervorgerufen werden. Anstelle dieser Anordnung schlagen wir einen differenziellen Ein-OPV Resonator mit kreuzgekoppelter Rueckkopplung vor, um die Anzahl der OPVs zu reduzieren. Diese Loesung ist kompakter, stromsparender, robuster und linearer als bisherige Twin-T basierte Ein-OPV Resonatoren. Das Konzept wurde anhand eines zeitkontinuierlichen Σ-Δ-ADCs neunter Ordnung in 0,35 µm CMOS experimentell ueberprüft. Dank des neuartigen Resonators und eines neuartigen kompakten und stromsparenden Summationsverstaerkers fuer das Feed-Forward Kompensationsnetzwerk konnte dieser Modulator mit nur fuenf statt der sonst üblichen zehn OPVs implementiert werden.},
    }
  • A. Eßwein, G. Dehm-Andone, A. Aleksieieva, C. Carlowitz, T. Ußmüller, G. Fischer, M. Vossiek, and R. Weigel, "Spannungsgesteuerter Colpitts-Oszillator mit weitem Abstimmbereich in Silizium-Germanium-Technologie und Ausgangsschalter zur Generierung gepulster frequenzmodulierter Ultrabreitband-Signale" in Analog 2011, 2011. [Bibtex]
    @inproceedings{esswein2011,
    author  = {Eßwein, Alexander and Dehm-Andone, Gunther and Aleksieieva, Anna and Carlowitz, Christian and Ußmüller, Thomas and Fischer, Georg and Vossiek, Martin and Weigel, Robert},
    title  = {Spannungsgesteuerter Colpitts-Oszillator mit weitem Abstimmbereich in Silizium-Germanium-Technologie und Ausgangsschalter zur Generierung gepulster frequenzmodulierter Ultrabreitband-Signale},
    booktitle  = {{Analog 2011}},
    year  = {2011},
    month  = {11},
    day  = {07},
    location  = {Erlangen},
    keywords  = {Colpitts,Oszillator,UWB},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1049},
    }
  • A. Chakraborty, B. Lämmle, and D. Kissinger, "Design Techniques for Broadband Low Noise Amplifiers at 120GHz in a SiGe BiCMOS Process" in ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2011. [Bibtex]
    @inproceedings{chakraborty2011,
    author  = {Chakraborty, Abhiram and Lämmle, Benjamin and Kissinger, Dietmar},
    title  = {Design Techniques for Broadband Low Noise Amplifiers at 120GHz in a SiGe BiCMOS Process},
    booktitle  = {{ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2011},
    month  = {11},
    location  = {Erlangen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1548},
    }
  • [DOI] C. Blümm, C. Heller, and R. Weigel, "SDR OFDM Waveform Design for a UGV/UAV Communication Scenario" in SDR-WinnComm Europe Conference, 2011, pp. 11-21. [Bibtex]
    @inproceedings{bluemm2011a,
    author  = {Blümm, Christian and Heller, Christoph and Weigel, Robert},
    title  = {SDR OFDM Waveform Design for a UGV/UAV Communication Scenario},
    booktitle  = {{SDR-WinnComm Europe Conference}},
    year  = {2011},
    month  = {11},
    pages  = {11--21},
    issn  = {1939-8115},
    doi  = {10.1007/s11265-011-0640-8},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1854},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, R. Weigel, and D. Kissinger, "Integrated dielectric millimeter-wave sensors for biomedical applications (invited)" in Analog, 2011, pp. 177-181. [Bibtex]
    @inproceedings{laemmle2011c,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar},
    title  = {Integrated dielectric millimeter-wave sensors for biomedical applications (invited)},
    booktitle  = {{Analog}},
    year  = {2011},
    month  = {11},
    pages  = {177--181},
    location  = {Erlangen, germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1153},
    }
  • J. Rascher and T. Ußmüller, "Phasenschieber für satellitenfunkempfänger-frontends / A phase shifter for satellite radio receiver frontends" in GMM Fachbericht 70: ANALOG 2011, 2011, pp. 72-73. [Bibtex]
    @inproceedings{rascher2011,
    author  = {Rascher, Jochen and Ußmüller, Thomas},
    title  = {Phasenschieber für satellitenfunkempfänger-frontends / A phase shifter for satellite radio receiver frontends},
    booktitle  = {{GMM Fachbericht 70: ANALOG 2011}},
    year  = {2011},
    month  = {11},
    pages  = {72--73},
    isbn  = {978-3-8007-3369-9},
    location  = {Erlangen, Germany},
    publisher  = {VDE Verlag GmbH},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/981},
    abstract  = {In this publication the advantages of passive phase shifters are shown which can be used in integrated satellite radio receiver frontends at 2.3GHz center frequency. High large signal robustness, low temperature dependency, and low inser- tion loss <1dB per phase bit can be achieved. The 3 bit phase shifter design uses FET switches in resistive body floating technique for that.},
    }
  • J. Essel and T. Ußmüller, "Entwurf von passiven CMOS RFID-Tags fuer HF-und UHF-Anwendungen" in ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2011. [Bibtex]
    @inproceedings{essel2011,
    author  = {Essel, Jochen and Ußmüller, Thomas},
    title  = {Entwurf von passiven CMOS RFID-Tags fuer HF-und UHF-Anwendungen},
    booktitle  = {{ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2011},
    month  = {11},
    location  = {Erlangen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1604},
    abstract  = {Dieses Tutorial bietet eine Einfuehrung in den Entwurf von "Ultra-Low Power Wireless Sensor Nodes". Zunaechst werden die Grundlagen der aktiven, semi-passiven und passiven Energieversorgung erlaeutert und die schaltungstechnische Realisierung der einzelnen Systembloecke beschrieben. Besonders wird dabei auf die angewendeten energiesparenden Entwurfstechniken und auf die Charakterisierung der jeweiligen Schaltungen eingegangen. Der zweite Teil des Tutorials befasst sich mit dem Design von Schaltungen zur energieeffizienten Datenerfassung in drahtlosen Sensorknoten und diskutiert die unterschiedlichen Kommunikationsprotokolle sowie das Gesamtsystem.},
    }
  • M. Jung, K. Schmid, G. Fischer, R. Weigel, and T. Ußmüller, "Vergleich verschiedener schaltungskonzepte für stromgebende ladungspumpen in phasenregelschleifen" in 12. GMM/ITGFachtagung Analog, 2011. [Bibtex]
    @inproceedings{jung2011c,
    author  = {Jung, Melanie and Schmid, Konstantin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    title  = {Vergleich verschiedener schaltungskonzepte für stromgebende ladungspumpen in phasenregelschleifen},
    booktitle  = {{12. GMM/ITGFachtagung Analog}},
    year  = {2011},
    month  = {11},
    location  = {Erlangen},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1286},
    }
  • [DOI] A. Gabiger-Rose, M. Kube, P. Schmitt, R. Weigel, and R. Rose, "Image denoising using bilateral filter with noise-adaptive parameter tuning" in IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society, 2011, pp. 4515-4520. [Bibtex]
    @inproceedings{gabiger-rose2011b,
    author  = {Gabiger-Rose, Anna and Kube, Matthias and Schmitt, Peter and Weigel, Robert and Rose, Richard},
    title  = {Image denoising using bilateral filter with noise-adaptive parameter tuning},
    booktitle  = {{IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society}},
    year  = {2011},
    month  = {11},
    day  = {10},
    pages  = {4515--4520},
    doi  = {10.1109/IECON.2011.6120053},
    location  = {Melbourne, Australia},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/875},
    abstract  = {In this work, a novel way to adjust a bilateral filter is presented. The bilateral filter is a combination of domain and range filtering. The domain filter acts as a low-pass filter. The range filter stands for the nonlinear component and plays an important part in edge preserving. Both filtering components can be adjusted by according parameters. Pursuant to our experience and achieved results in terms of the image quality it is more effective to readjust the range filter to the noise level than to cope with the fine tuning of the spatial filter. In this work, we show how the adjustment parameter for the nonlinear range component can be derived from the standard deviation of noise, which allows automatic noise-adaptive adjustment of the filter.},
    }
  • [DOI] D. Brenk, J. Essel, J. Heidrich, R. Agethen, D. Kissinger, G. Hofer, G. Holweg, G. Fischer, and R. Weigel, "Energy-efficient wireless sensing using a generic ADC sensor interface within a passive multi-standard RFID transponder", IEEE Sensors Journal, vol. 11, iss. 11, pp. 2698-2710, 2011. [Bibtex]
    @article{brenk2011,
    author  = {Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Agethen, Roman and Kissinger, Dietmar and Hofer, Günter and Holweg, Gerald and Fischer, Georg and Weigel, Robert},
    title  = {Energy-efficient wireless sensing using a generic ADC sensor interface within a passive multi-standard RFID transponder},
    journal  = {{IEEE Sensors Journal}},
    year  = {2011},
    month  = {11},
    pages  = {2698--2710},
    issn  = {1530-437X},
    doi  = {10.1109/JSEN.2011.2156782},
    publisher  = {IEEE},
    volume  = {11},
    number  = {11},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1139},
    }
  • T. Thoenes, H. Milosiu, F. Oehler, and J. Thielecke, "Entwurf, Modellierung und Simulation von stromsparenden Phasenregelkreisen fuer integrierte 868 MHz-Funktransmitter in CMOS-Technologie" in ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2011, pp. 39-44. [Bibtex]
    @inproceedings{thoenes2011,
    author  = {Thoenes, T. and Milosiu, Heinrich and Oehler, Frank and Thielecke, Jörn},
    title  = {Entwurf, Modellierung und Simulation von stromsparenden Phasenregelkreisen fuer integrierte 868 MHz-Funktransmitter in CMOS-Technologie},
    booktitle  = {{ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2011},
    month  = {11},
    pages  = {39--44},
    isbn  = {978-3-8007-3369-9},
    location  = {Erlangen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1547},
    abstract  = {In dieser Veroeffentlichung wird die Entwurfsmethodik fuer einen integrierten Phasenregelkreis in CMOS-Technologie fuer Funksysteme vorgestellt. In einem Top-Down-Entwurfsprozess werden zunaechst die Anforderungen formuliert und die Parameter der Regelschleife berechnet. Unter Verwendung der Modellierungssprache Verilog-A wird dann das Verhalten der Schaltung simuliert und verifiziert und diese dann im Anschluss auf Transistorebene implementiert. Die gewonnenen Erkenntnisse stellen die Grundlage fuer weitere Untersuchungen zu stromsparenden Uebertragungskonzepten fuer OOK (On-off keying)-modulierte Sender dar.},
    }
  • [DOI] R. Agethen, F. Lurz, A. Schwarzmeier, G. Fischer, R. Weigel, and D. Kissinger, "An online telemetering system for mobile health parameter monitoring and medical assistance" in Internation Conference on Sensing Technology, 2011, pp. 496-499. [Bibtex]
    @inproceedings{agethen2011b,
    author  = {Agethen, Roman and Lurz, Fabian and Schwarzmeier, Andre and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {An online telemetering system for mobile health parameter monitoring and medical assistance},
    booktitle  = {{Internation Conference on Sensing Technology}},
    year  = {2011},
    month  = {11},
    pages  = {496--499},
    doi  = {10.1109/ICSensT.2011.6137024},
    location  = {Palmerston North, New Zealand},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1154},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "An Advanced Millimeter-Wave FMCW-Radar System Simulation Environment for the Automotive Sector" in 12. GMM/ITG-Fachtagung ANALOG, 2011, pp. 104-109. [Bibtex]
    @inproceedings{dudek2011e,
    author  = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {An Advanced Millimeter-Wave FMCW-Radar System Simulation Environment for the Automotive Sector},
    booktitle  = {{12. GMM/ITG-Fachtagung ANALOG}},
    year  = {2011},
    month  = {11},
    day  = {08},
    pages  = {104--109},
    isbn  = {978-3-8007-3369-9},
    location  = {Erlangen, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/467},
    abstract  = {In this paper a millimeter-wave radar system simulation environment for frequency-modulated continuous-wave radar using a 3D ray tracing channel simulator is presented. Therefore we use Agilent’s RF design environment ADS® for system simulation and calculate the channel impulse response based on the data received from a 3D ray tracer in a Matlab® co-simulation. To reduce computing time the whole signal flow is processed in a complex baseband representation and scattering center models are used as substitute for complex polygon targets as further improvement. Nevertheless all effects occurring at harmonic bands due to nonlinearities in the transmitter and receiver circuits are well reflected in the simulation. A typical road scenario is simulated and the results show the capabilities of the simulation approach in terms of speed and accuracy.},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "Eine erweiterte Millimeterwellen FMCW-Radar Systemsimulationsumgebung fuer den Einsatz im Automobilbereich" in ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden, 2011. [Bibtex]
    @inproceedings{dudek2011d,
    author  = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {Eine erweiterte Millimeterwellen FMCW-Radar Systemsimulationsumgebung fuer den Einsatz im Automobilbereich},
    booktitle  = {{ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden}},
    year  = {2011},
    month  = {11},
    location  = {Erlangen, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1549},
    abstract  = {In diesem Artikel stellen wir eine Simulationsumgebung fuer Millimeterwellen FMCW-Radare fuer den Einsatz im Automobilbereich vor, die einen 3D-Kanalsimulator beinhaltet. Dafuer nutzen wir Agilent's RF Entwicklungsumgebung ADS(R) fuer die Systemsimulation und berechnen die Impulsantwort des Kanals, basierend auf den Daten die von einem 3D-Raytracer generiert werden, in einer Matlab(R) Cosimulation. Um die Rechenzeit zu reduzieren findet der gesamte Signalfluss im komplexen Basisband statt und aufwaendige Polygonmodelle werden durch ihre Streuzentrenmodelle als weitere Verbesserung substituiert. Alle Effekte in den Harmonischen Zonen, die auf Grund von Nichtlinearitaeten im Sende- oder Empfangsmodul auftreten, werden in der Simulation korrekt wiedergegeben. Um die Leistungsfähigkeit des Simulationsansatzes, was Geschwindigkeit und Genauigkeit anbelangt, zu evaluieren, wird ein typisches Verkehrsszenario simuliert.},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, D. Kissinger, and R. Weigel, "A 122 GHz multiprobe reflectometer for dielectric sensor readout in SiGe BiCMOS technology" in IEEE Compound Semiconductor Integrated Circuits Symposium, 2011, pp. 1-4. [Bibtex]
    @inproceedings{laemmle2011a,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar and Weigel, Robert},
    title  = {A 122 GHz multiprobe reflectometer for dielectric sensor readout in SiGe BiCMOS technology},
    booktitle  = {{IEEE Compound Semiconductor Integrated Circuits Symposium}},
    year  = {2011},
    month  = {10},
    pages  = {1--4},
    location  = {Waikoloa, HI},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1152},
    }
  • M. Kamper, G. Ulbricht, R. Weigel, and G. Fischer, "Comparison of class A and class D RF amplifier operation with focus on reverse intermodulation and efficiency performance" in European Microwave Integrated Circuits Conference, 2011, pp. 272-275. [Bibtex]
    @inproceedings{kamper2011,
    author  = {Kamper, Michael and Ulbricht, Gerald and Weigel, Robert and Fischer, Georg},
    title  = {Comparison of class A and class D RF amplifier operation with focus on reverse intermodulation and efficiency performance},
    booktitle  = {{European Microwave Integrated Circuits Conference}},
    year  = {2011},
    month  = {10},
    pages  = {272--275},
    location  = {Manchester, EN},
    publisher  = {IEEE},
    keywords  = {UHF power amplifiers,current-mode circuits,intermodulation distortion,radiofrequency amplifiers,current mode class D power amplifier,reverse intermodulation distortion},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6102785},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1620},
    abstract  = {A Current Mode Class D (CMCD) power amplifier at 900 MHz is presented. After a theoretical analysis, a class D amplifier is designed, simulated and afterwards assembled and characterized. Thereby, a maximum drain efficiency of 80.6\%, and a maximum power added efficiency (PAE) of 72.8\% at a switching frequency of 864 MHz, and an output power of 28.2 dBm were obtained. A linear class A amplifier using the same transistor exhibits a drain efficiency of 48.9\% and 48.0\% PAE at a comparable output power. An analysis of the reverse intermodulation distortion (IMD) of the switched-mode class D amplifier in comparison to the class A amplifier shows a 15dB improvement of the third order intermodulation ratio. To the authors' knowledge, this is the first practical verification of the superior reverse intermodulation performance of switched-mode amplifiers.},
    }
  • [DOI] S. Zorn, G. Bozsik, R. Rose, A. Götz, A. Koelpin, and R. Weigel, "A power sensor unit for the localization of GSM mobile phones for search and rescue applications" in IEEE Sensors, 2011, pp. 1301-1304. [Bibtex]
    @inproceedings{zorn2011a,
    author  = {Zorn, Stefan and Bozsik, Gabor and Rose, Richard and Götz, Alexander and Koelpin, Alexander and Weigel, Robert},
    title  = {A power sensor unit for the localization of GSM mobile phones for search and rescue applications},
    booktitle  = {{IEEE Sensors}},
    year  = {2011},
    month  = {10},
    pages  = {1301--1304},
    issn  = {1930-0395},
    doi  = {10.1109/ICSENS.2011.6127162},
    location  = {Limerick, IE},
    publisher  = {IEEE},
    keywords  = {cellular radio,disasters,earthquakes,geomorphology,mobile handsets,sensor placement,statistical analysis,GSM},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1606},
    abstract  = {Recent statistics show an increase in environmental disasters, a fact which is also perceivable to the public as reports of avalanches, earthquakes and landslides mount in media coverage. Recent examples are Haiti 2010 and Fukushima 2011. Search and Rescue with modern localization techniques consequently attracts attention from scientific and industrial sides. This paper introduces a field strength measurement unit, which is part of the I-LOV project1. In this project partners from relief organizations, universities, and industry investigate enhancements in disaster handling and victim rescue. One possible option is to take advantage of the fact that most people own a mobile phone today and take it with them the whole day. To locate a person by his or her mobile phone requires to find the maximum of its radiated field strength. This paper will show a new power sensor unit for GSM signals. The complete design flow from requirements considerations to measurement results will be demonstrated. A dynamic range of 107 dB is only one of the remarkable outcomes.},
    }
  • R. Rose, S. Zorn, A. Götz, G. Fischer, and R. Weigel, "A new technique to improve AoA using dual polarization" in European Microwave Conference, 2011, pp. 420-423. [Bibtex]
    @inproceedings{rose2011a,
    author  = {Rose, Richard and Zorn, Stefan and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    title  = {A new technique to improve AoA using dual polarization},
    booktitle  = {{European Microwave Conference}},
    year  = {2011},
    month  = {10},
    day  = {09},
    pages  = {420--423},
    isbn  = {978-1-61284-235-6},
    location  = {Manchester, UK},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/674},
    abstract  = {This paper presents a technique for reducing the AoA measurement error caused by the influence of multipath propagation. This technique can be implemented using two approaches, where either the amplitude or the power of the received signals in the polarization domain can be implicated. After the polarization angle of the LOS signal is derived, the dual polarized antenna configuration has to be computationally rotated by this angle to reduce the influence of multipath components. The simulation results show, that the proposed technique leads to a significant reduction of AoA estimation error originated from a multipath component.},
    }
  • G. Vinci, F. Barbon, R. Weigel, and A. Koelpin, "A Novel, Wide Angle, High Resolution Direction-Of-Arrival Detector" in European Microwave Week (EuMW) 2011, 2011, pp. 265-268. [Bibtex]
    @inproceedings{vinci2011b,
    author  = {Vinci, Gabor and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    title  = {A Novel, Wide Angle, High Resolution Direction-Of-Arrival Detector},
    booktitle  = {{European Microwave Week (EuMW) 2011}},
    year  = {2011},
    month  = {10},
    day  = {12},
    pages  = {265--268},
    isbn  = {978-1-4577-1156-5},
    location  = {Manchester, UK},
    publisher  = {IEEE},
    keywords  = {Accuracy,Calibration,Detectors,Polynomials,Radio frequency,Receiving antennas},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6101014},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1025},
    abstract  = {Direction-Of-Arrival (DOA) detection is a demanding task for a wide range of applications where high accuracy, robustness, small size, and low cost are important requirements. An innovative Six-Port based DOA detector is hereby presented. Several applications benefit from the advantages of this new interferometric detection principle. A new high resolution dual Six-Port based detector is presented featuring among the advantages provided by the interferometric principle also a wide angle of detection as well as an increased dynamic range and new digital signal processing strategies.},
    }
  • J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Remote Powering Systems of Medical Implants for Maintenance Free Healthcare Applications" in European Microwave Conference (EuMC), 2011, pp. 131-134. [Bibtex]
    @inproceedings{walk2011c,
    author  = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    title  = {Remote Powering Systems of Medical Implants for Maintenance Free Healthcare Applications},
    booktitle  = {{European Microwave Conference (EuMC)}},
    year  = {2011},
    month  = {10},
    pages  = {131--134},
    location  = {Manchester, UK},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/961},
    abstract  = {For favorable health care sensor devices especially long term monitoring sensors have to be completely imperceptible and maintenance free. A solution on these requirements is an implantable sensor system. The permittivity of body tissue and the desired distance to a remote station confronts the technology with several challenges. To avoid compromises and to be able to optimize both, communication and remote energy supply, we defined a novel concept and split frequency ranges. With the provided system energy can be rectified at 13.56 MHz from a remote station. Its powering level is 10mW. To store the energy a buffering concept is calculated based on a capacitor of about 4μF. To harvest energy for 0.2 s is enough to supply low power sensor devices and a MICS-Band transmitter for communication at 402 MHz-405 MHz. The active time of the implanted transmitter is in the range of 5ms with a transmission power of approximately 25μW.},
    }
  • F. Hausknecht and S. Wibbing, "Evaluierung eines Verfahrens zur Positionsbestimmung von Funkemittern fuer ein gegebenes Empfaengersystem" in Radio Techniques and Technologies for Commercial Communication and Sensing Applications, 2011. [Bibtex]
    @inproceedings{hausknecht2011a,
    author  = {Hausknecht, Frank and Wibbing, Sascha},
    title  = {Evaluierung eines Verfahrens zur Positionsbestimmung von Funkemittern fuer ein gegebenes Empfaengersystem},
    booktitle  = {{Radio Techniques and Technologies for Commercial Communication and Sensing Applications}},
    year  = {2011},
    month  = {10},
    location  = {Berlin, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1546},
    }
  • S. Schröter, L. Zimmermann, O. Schwender, G. Fischer, and A. Koelpin, "Demonstrator of a Scanning Receiver Subsystem for Cognitive Professional Wireless Microphone Systems" in Technical Symposium at ITU Telecom World 2011, 2011, pp. 193-198. [Bibtex]
    @inproceedings{schroeter2011,
    author  = {Schröter, Simon and Zimmermann, Lars and Schwender, O. and Fischer, Georg and Koelpin, Alexander},
    title  = {Demonstrator of a Scanning Receiver Subsystem for Cognitive Professional Wireless Microphone Systems},
    booktitle  = {{Technical Symposium at ITU Telecom World 2011}},
    year  = {2011},
    month  = {10},
    pages  = {193--198},
    isbn  = {978-1-4577-1148-0},
    location  = {Geneva, Switzerland},
    url  = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6100954},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1016},
    abstract  = {ProfessionalWireless Microphone Systems (PWMS), transmitting voice and music in live events such as concerts or conferences, demand the highest level of sound quality and reliability. Dropouts, noise and interference have to be prevented at any moment of the transmission. At present, these requirements can be fulfilled as PWMS utilize locally unused TV channels and thus operate in a protected radio environment. However, in the near future, the “Digital Dividend” will open the spectrum to other users, leading to less spectrum allocation to PWMS. In order to maintain the high quality of service of the radio links, the Specialist Task Force STF386 on Cognitive Programme Making and Special Events (C-PMSE) of the European Telecommunications Standards Institute (ETSI) proposed a proactive cognitive approach. A major part of this proposition is a Scanning Receiver Subsystem (SCS) that monitors the current spectrum occupation according to which a Cognitive Engine can dynamically configure the radio links. The SCS is composed of multiple Scanning Receivers (SCR) that measure the spectrum occupation at different locations within an event site and one or more Scanning Receiver Controllers (SCC). The SCC combine these observations to determine positions of interferers and estimate their future locations as well as their impact on the microphone links. This paper reviews the current activities of ETSI for standardization of a cognitive wireless microphone system with an in depth focus on the scanning receiver subsystem. Furthermore, the hardware of a low-cost scanning receiver, which has been developed and tested at our institute, is presented. The proposed receiver architecture fulfills the spectrum sensing capabilities recommended by ETSI and can be built at an affordable price, allowing the described proactive cognitive radio system to be realized.},
    }
  • S. Lindner, "Entwurf und Aufbau eines erweiterten Sechstor-Empfänger-Systems," Diplomarbeit Diplomarbeit, 2011. [Bibtex]
    @diplomathesis{lindner2011,
    author  = {Lindner, Stefan},
    title  = {Entwurf und Aufbau eines erweiterten Sechstor-Empfänger-Systems},
    booktitle  = {{}},
    year  = {2011},
    month  = {10},
    day  = {27},
    type  = {Diplomarbeit},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1825},
    }
  • [DOI] B. Lämmle, G. Vinci, L. Maurer, A. Koelpin, and R. Weigel, "An Integrated 77-GHz Six-Port Receiver Frontend for Angle-of-Arrival Detection" in Bipolar/BiCMOS Circuits and Technology Meeting (BCTM) 2011, 2011, pp. 219-222. [Bibtex]
    @inproceedings{laemmle2011b,
    author  = {Lämmle, Benjamin and Vinci, Gabor and Maurer, Linus and Koelpin, Alexander and Weigel, Robert},
    title  = {An Integrated 77-GHz Six-Port Receiver Frontend for Angle-of-Arrival Detection},
    booktitle  = {{Bipolar/BiCMOS Circuits and Technology Meeting (BCTM) 2011}},
    year  = {2011},
    month  = {10},
    day  = {09},
    pages  = {219--222},
    isbn  = {978-1-61284-165-6},
    doi  = {10.1109/BCTM.2011.6082786},
    location  = {Atlanta, GA, USA},
    publisher  = {IEEE},
    keywords  = {Antenna measurements,Calibration,Detectors,Frequency measurement,Phase measurement,Radar,Six-Port},
    number  = {12385847},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1032},
    abstract  = {In this publication an integrated six-port receiver front-end for angle-of-arrival detection of 77-GHz signals is presented. Applications of the circuit are direction finding, auto-motive radar calibration, or high precision industrial radar. The measurement principle is based on superposition of two incident signals and power detection. The circuit has two input amplifiers, a broadband passive six-port network, and four power detectors. The integrated circuit has a power consumption of 95mW with 5V supply voltage. It is fabricated in a 200-GHz fT SiGe bipolar technology and occupies only 1028 × 1128 μm2. Functionality is demonstrated by applying two different frequencies at the input ports. A simple calibration method is proposed and all calibration parameters are calculated.},
    }
  • [DOI] R. Koch, C. Bauer, J. Kiwitt, F. M. Potschi, and R. Weigel, "Ultra low-profile self-matched HTCC SAW-duplexer: manufacturing and performance challenges" in IEEE International Ultrasonics Symposium, 2011, pp. 1829-1832. [Bibtex]
    @inproceedings{koch2011,
    author  = {Koch, Robert and Bauer, Christian and Kiwitt, Jürgen and Potschi, F.M. and Weigel, Robert},
    title  = {Ultra low-profile self-matched HTCC SAW-duplexer: manufacturing and performance challenges},
    booktitle  = {{IEEE International Ultrasonics Symposium}},
    year  = {2011},
    month  = {10},
    pages  = {1829--1832},
    issn  = {1948-5719},
    doi  = {10.1109/ULTSYM.2011.0457},
    location  = {Orlando, FL, USA},
    publisher  = {IEEE},
    keywords  = {3G mobile communication,Q-factor,bulk acoustic wave devices,code division multiple access,surface acoustic wave filters,BAW technology},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1608},
    abstract  = {Providing the required ability of simultaneously transmitting and receiving RF signals, duplexers are one of the key components in the well established 3G (W)-CDMA communication systems. For mobile terminals, duplexers in micro-acoustic filter technology have been used for several years. Generally, these duplexers are composed of two band pass filters and additional passive elements to improve the electrical performance. Based on the prototypical packaging approach which has been used for the recently published demonstrator of the ultra low profile self-matched SAW-duplexers we will present details of the preliminary extension of the well established Cu-frame CSSP3 packaging technology. This extension enables the integration of miniaturized planar copper coils on the top layer of an HTCC substrate. Therefore, it leads to a new miniaturization potential for the coming generations of packages for self-matched duplexers in SAW or BAW technology. Additionally, we will present some novel investigation results regarding the influence of the manufacturing process on the Q-factor. Here, the surface roughness determined by the manufacturing process and by the roughness of the HTCC at the interface of the coil and the HTCC affects the Q-factor. Including the surface roughness in the electro-magnetic simulation allows us to determine the resulting Q-factor of the planar coils very precisely. The excellent match of measured and simulated Q-factors approves this approach. Furthermore, using an EM-model with the roughness modeling for the coils, we have been able to predict the insertion loss of our filters accurately which will be demonstrated by the very good agreement of measured and simulated scattering parameters of the ultra low-profile self-matched duplexer.},
    }
  • G. Dehm-Andone, R. Wansch, H. Gerhäuser, R. Weigel, and A. Koelpin, "A cross polarized antenna with reflector based on electromagnetic bandgap (EBG) material" in IEEE Metamaterials 2011: The Fifth International Congress on Advanced Elec-tromagnetic Materials in Microwaves and Optics, 2011, pp. 1-3. [Bibtex]
    @inproceedings{dehm-andone2011,
    author  = {Dehm-Andone, Gunther and Wansch, Rainer and Gerhäuser, Heinz and Weigel, Robert and Koelpin, Alexander},
    title  = {A cross polarized antenna with reflector based on electromagnetic bandgap (EBG) material},
    booktitle  = {{IEEE Metamaterials 2011: The Fifth International Congress on Advanced Elec-tromagnetic Materials in Microwaves and Optics}},
    year  = {2011},
    month  = {10},
    day  = {13},
    pages  = {1--3},
    location  = {Barcelona, Spain},
    publisher  = {IEEE},
    keywords  = {electromagnetic bandgap,cross polarization,surface wave suppression,reflector},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/551},
    abstract  = {In this paper a gain improved cross polarized dipole antenna based on a Mushroom-Jerusalem-Cross hybrid electromagnetic bandgap (MJCH-EBG) structure is presented. For low frequencies these structures behave like metal surfaces. For a specific bandwidth at higher frequencies, that has to be dimensioned, they are highly resistive and represent a perfect magnetic conductor. This effect can be used to realize reflectors and to suppress surface waves at antennas. This helps to miniaturize these kind of antennas. Design, simulation, measurement and analysis is performed for this antenna at 10.7GHz},
    }
  • [DOI] R. Gierlich, J. Hüttner, A. Ziroff, R. Weigel, and M. Huemer, "A Reconfigurable MIMO System for High-Precision FMCW Local Positioning", IEEE Transactions on Microwave Theory and Techniques, vol. 59, iss. 12, pp. 3228-3238, 2011. [Bibtex]
    @article{gierlich2011,
    author  = {Gierlich, Roland and Hüttner, Jörg and Ziroff, Andreas and Weigel, Robert and Huemer, Mario},
    title  = {A Reconfigurable MIMO System for High-Precision FMCW Local Positioning},
    journal  = {{IEEE Transactions on Microwave Theory and Techniques}},
    year  = {2011},
    month  = {10},
    day  = {14},
    pages  = {3228--3238},
    issn  = {0018-9480},
    doi  = {10.1109/TMTT.2011.2169079},
    publisher  = {IEEE},
    keywords  = {MIMO communication,antenna arrays,direction-of-arrival estimation,receiving antennas,transmitting antennas,ultra wideband communication,MIMO datasets,angle of arrival,angle of departure,frequency 5.8 GHz,high-precision FMCW local positioning system,indoor environments,industrial-scientific-medical band,interfering way,multipath components,linear frequency-modulated continuous-wave signals,multiple-input multiple-output measurement concept,received signals,receiving antenna arrays,reconfigurable MIMO system,single-antenna setup,super-resolution direction-finding techniques,transmitting antenna arrays,ultrawideband local positioning systems,Beam steering,Chirp modulation,Distance measurement,MIMO radar,Multipath channels,Beam steering,chirp modulation,distance measurement,multipath channels,multiple-input multiple-output (MIMO) radar},
    volume  = {59},
    number  = {12},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1269},
    abstract  = {In this paper, a highly accurate local positioning system is presented that is based on linear frequency-modulated continuous-wave signals in the 5.8-GHz industrial-scientific-medical band. The developed system allows for much higher operating distances than leading ultra-wideband local positioning systems, while it provides the same or even better accuracy. This is achieved by a novel multiple-input multiple-output (MIMO) measurement concept that enables the receiving unit to control the beam patterns of the receiving and the transmitting antenna arrays by a coherent combination of the received signals. In this way, interfering multipath components are suppressed, leading to a significantly reduced ranging error. Furthermore, the angle of arrival and the angle of departure are determined from the MIMO datasets using super-resolution direction-finding techniques. For position determination, both range and angle information are exploited. Extensive measurements with the MIMO system in different indoor environments show that the position error can be reduced by up to 80\% compared to an equivalent single-antenna setup.},
    }
  • [DOI] M. Dudek, I. Nasr, D. Kissinger, R. Weigel, and G. Fischer, "The Impact of Phase Noise Parameters on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications" in CIE International Conference on Radar, 2011, pp. 494-497. [Bibtex]
    @inproceedings{dudek2011b,
    author  = {Dudek, Manuel and Nasr, Ismail and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {The Impact of Phase Noise Parameters on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications},
    booktitle  = {{CIE International Conference on Radar}},
    year  = {2011},
    month  = {10},
    pages  = {494--497},
    doi  = {10.1109/CIE-Radar.2011.6159587},
    location  = {Chengdu, China},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/461},
    abstract  = {Accurate system simulations have proven to be a valuable aid during the development process and help to decrease the time-to-market and the amount of design iterations, thus keeping development costs at a moderate level. Therefore a frequency-modulated continuous-wave (FMCW) radar system simulation environment has been built up, enabling for performance analysis of millimeter-wave radar frontends for automotive applications. A key parameter especially for radar systems applying the FMCW principle thereby is the linearity of the frequency ramp as it directly affects the quality of the target signal and thus the performance of the entire radar sensor. Hence in this scientific paper we investigate the influence of a phase noise afflicted VCO on the target signal detection, and the range resolution respectively. Leeson’s equation is applied to model oscillator phase noise and the results show which parameters are crucial for the radar system. Eventually a two-target scenario is calculated to substantiate the statements taken.},
    }
  • M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "A millimeter-wave FMCW radar system simulator for automotive applications including nonlinear component models" in European Radar Conference (EuRAD), 2011, pp. 89-92. [Bibtex]
    @inproceedings{dudek2011c,
    author  = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {A millimeter-wave FMCW radar system simulator for automotive applications including nonlinear component models},
    booktitle  = {{European Radar Conference (EuRAD)}},
    year  = {2011},
    month  = {10},
    day  = {12},
    pages  = {89--92},
    isbn  = {978-1-4577-1156-5},
    location  = {Manchester, UK},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/459},
    abstract  = {A fully differential millimeter wave frequency modulated continuous wave (FMCW) radar architecture is built up in Agilent's RF design and system simulation environment ADS® to investigate the influence of RF impairments on system level on the target signal. To take also the surroundings of the automotive scenario into account a 3D ray tracing channel simulator is coupled in a Matlab® co-simulation providing realistic data of the traffic situation. Therefore investigations on the performance of the radar frontend in an automotive long range radar (LRR) application are enabled, the functionality of the circuitry can be verified and components designed in the most beneficial way, so that the best performance is achieved with the available resources. For nonlinear behavior the frontend components are parameterized according to recently published values for 77GHz SiGe circuits. The functionality of the complete simulation environment is demonstrated by calculating a typical traffic situation.},
    }
  • C. Spratler, "Stoeremission von DC-Kleinmotoren–Vorhersage durch Netzwerksimulation" in Kleinheubacher Tagung, 2011. [Bibtex]
    @inproceedings{spratler2011,
    author  = {Spratler, Christian},
    title  = {Stoeremission von DC-Kleinmotoren–Vorhersage durch Netzwerksimulation},
    booktitle  = {{Kleinheubacher Tagung}},
    year  = {2011},
    month  = {09},
    location  = {Kleinheubach, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1602},
    }
  • [DOI] T. Su, M. Unger, T. Steinecke, and R. Weigel, "Using Error-Source Switching (ESS) Concept to Analyze the Conducted Radio Frequency Electromagnetic Immunity of Microcontrollers", IEEE Transactions on Electromagnetic Compatibility, vol. 54, iss. 3, pp. 634-645, 2011. [Bibtex]
    @article{su2011,
    author  = {Su, Tao and Unger, Markus and Steinecke, Thomas and Weigel, Robert},
    title  = {Using Error-Source Switching (ESS) Concept to Analyze the Conducted Radio Frequency Electromagnetic Immunity of Microcontrollers},
    journal  = {{IEEE Transactions on Electromagnetic Compatibility}},
    year  = {2011},
    month  = {09},
    day  = {15},
    pages  = {634--645},
    issn  = {0018-9375},
    doi  = {10.1109/TEMC.2011.2165341},
    publisher  = {IEEE},
    keywords  = {Electromagnetic compatibility (EMC),electromagnetic interference,failure analysis,integrated circuits (ICs),microcontrollers,simulation},
    volume  = {54},
    number  = {3},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1300},
    abstract  = {This paper introduces a new concept, the error-source switching (ESS), for the electromagnetic immunity of microcontrollers. Under the concept of ESS, a microcontroller is a multiple-module IC. A functional module, named as the error source (ES), is thebottleneck for the immunity of microcontrollers. During the sweeping of the disturbance frequency in the RF immunity test, the ES switches between various functional modules. Each functional module has an effective frequency range. Through the theoretical analysis, the measurement and the simulation, this paper shows that the frequency behavior of the conducted RF immunity of microcontrollers can be correctly understood and reasonably simulated when and only when the ESS mechanism is considered. That conclusion provides a criterion on how to construct microcontroller models and the simulation environment in a logical way for immunity simulations.},
    }
  • [DOI] S. Glock, G. Fischer, R. Weigel, R. Hasholzner, and T. Ußmüller, "A state-based power estimation methodology at system level for integrated RF front-ends" in Semiconductor Conference Dresden 2011, 2011, pp. 1-4. [Bibtex]
    @inproceedings{glock2011,
    author  = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Hasholzner, Ralf and Ußmüller, Thomas},
    title  = {A state-based power estimation methodology at system level for integrated RF front-ends},
    booktitle  = {{Semiconductor Conference Dresden 2011}},
    year  = {2011},
    month  = {09},
    day  = {27},
    pages  = {1--4},
    doi  = {10.1109/SCD.2011.6068723},
    location  = {Dresden, Germany},
    publisher  = {IEEE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/954},
    abstract  = {This paper introduces an approach to model the power consumption of analog and mixed-signal systems at system level. The method is based on power state machines and is practically applied to a zero-IF receiver. The power state machines model the static power consumption of components with respect to their current state or state transition. The power consumption per state and state transition, respectively, is obtained from a low-level circuit simulation or from measurement. The concept of power state machines can be used for any analog component and enables the simulation of heterogeneous systems with the benefit of a fast simulation time.},
    }
  • [DOI] M. Jung, A. Ferizi, T. Ußmüller, G. Fischer, and R. Weigel, "A digital trimmable comparator for high precision ADCs in wireless sensor nodes" in Semiconductor Conference Dresden, 2011, pp. 1-4. [Bibtex]
    @inproceedings{jung2011b,
    author  = {Jung, Melanie and Ferizi, Alban and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    title  = {A digital trimmable comparator for high precision ADCs in wireless sensor nodes},
    booktitle  = {{Semiconductor Conference Dresden}},
    year  = {2011},
    month  = {09},
    pages  = {1--4},
    isbn  = {978-1-4577-0431-4},
    doi  = {10.1109/SCD.2011.6068760},
    location  = {Dresden},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1285},
    }
  • F. Hausknecht, R. Mzyk, G. Dehm-Andone, G. Fischer, and R. Weigel, "A multichannel scanning receiver system for surveillance applications" in 6th Future Security Research conference, 2011. [Bibtex]
    @inproceedings{hausknecht2011,
    author  = {Hausknecht, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Fischer, Georg and Weigel, Robert},
    title  = {A multichannel scanning receiver system for surveillance applications},
    booktitle  = {{6th Future Security Research conference}},
    year  = {2011},
    month  = {09},
    day  = {05},
    location  = {Berlin},
    keywords  = {Multichannel,scanning,Receiver,surveillance},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1050},
    }
  • [DOI] R. Agethen, B. Lämmle, G. Fischer, R. Weigel, and D. Kissinger, "Design of an integrated 60 GHz cross-coupled oscillator in SiGe technology" in IEEE Semiconductor Conference Dresden, 2011. [Bibtex]
    @inproceedings{agethen2011a,
    author  = {Agethen, Roman and Lämmle, Benjamin and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {Design of an integrated 60 GHz cross-coupled oscillator in SiGe technology},
    booktitle  = {{IEEE Semiconductor Conference Dresden}},
    year  = {2011},
    month  = {09},
    day  = {27},
    doi  = {10.1109/SCD.2011.6068746},
    location  = {Dresden, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1056},
    abstract  = {This paper presents the design of an integrated fully differential 60GHz voltage controlled oscillator in SiGe technology featuring f t = 200 GHz high speed bipolar HBTs. The VCO is based on a differential Colpitts VCO. The core consumes an average amount of 26mA @ 3.3V supply voltage. The tuning bandwidth is about 12\%. The utilized buffer at the output consumes additional 64 mA @ 3.3V and provides an output power of 13dBm over the tuning bandwidth. The phase noise @ 1MHz is less than -75 dBc/Hz.},
    }
  • [DOI] R. Weigel, A. Leibinger, and M. Giese, "Automated extraction of conducted emission relevant parameters in the case of a DC motor" in International Conference on Electromagnetics in Advanced Applications, 2011, pp. 568-571. [Bibtex]
    @inproceedings{weigel2011f,
    author  = {Weigel, Robert and Leibinger, Arpad and Giese, M.},
    title  = {Automated extraction of conducted emission relevant parameters in the case of a DC motor},
    booktitle  = {{International Conference on Electromagnetics in Advanced Applications}},
    year  = {2011},
    month  = {09},
    pages  = {568--571},
    doi  = {10.1109/ICEAA.2011.6046404},
    location  = {Torino, IT},
    publisher  = {IEEE},
    keywords  = {DC motors,electromagnetic compatibility,CISPR 25,SABER,automated EMC analysis,circuit simulation model,device optimization,electromagnetic compatibility},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1570},
    abstract  = {The analysis of the EMC (electromagnetic compatibility) behavior of products is needed nowadays in early project stages. Automation of EMC analysis in the case of systems with high complexity is crucial, because of the high number of parameters and extensive mechanisms of interaction. Systematic methods, however, can find the system parameters which dominate the behavior. Such procedures can be automated, thereby simultaneously speeding up the process and reducing the risk of errors. This paper gives a solution for the automated EMC analysis and optimization of devices using the simulator SABER. The emission was simulated according to the measurement standard CISPR 25. The parameters with the greatest influence on emission characteristics can be extracted from the parameters of system elements in a circuit simulation model by this proposed method based on global sensitivity analysis.},
    }
  • R. Weigel, A. Koelpin, R. Rose, S. Zorn, and A. Götz, "A new System for Mobile Phone Localization for Search and Rescue Applications" in Future Security, 2011. [Bibtex]
    @inproceedings{weigel2011g,
    author  = {Weigel, Robert and Koelpin, Alexander and Rose, Richard and Zorn, Stefan and Götz, Alexander},
    title  = {A new System for Mobile Phone Localization for Search and Rescue Applications},
    booktitle  = {{Future Security}},
    year  = {2011},
    month  = {09},
    location  = {Berlin, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1603},
    }
  • [DOI] M. Jung, A. Ferizi, T. Ußmüller, G. Fischer, and R. Weigel, "A 9.7 mW 0.13 um CMOS PLL for Use in 24 GHz Sensor Nodes" in IEEE International Midwest Symposium on Circuits and Systems, 2011, pp. 1-4. [Bibtex]
    @inproceedings{jung2011a,
    author  = {Jung, Melanie and Ferizi, Alban and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    title  = {A 9.7 mW 0.13 um CMOS PLL for Use in 24 GHz Sensor Nodes},
    booktitle  = {{IEEE International Midwest Symposium on Circuits and Systems}},
    year  = {2011},
    month  = {08},
    pages  = {1--4},
    issn  = {1548-3746},
    doi  = {10.1109/MWSCAS.2011.6026272},
    location  = {Seoul},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1284},
    }
  • [DOI] S. Zeller, C. Münker, and R. Weigel, "A 9th-Order Continuous Time Sigma-Delta-ADC with X-Coupled Differential Single-Opamp Resonators" in IEEE International Midwest Symposium on Circuits and Systems, 2011, pp. 1-4. [Bibtex]
    @inproceedings{zeller2011a,
    author  = {Zeller, Sebastian and Münker, Christian and Weigel, Robert},
    title  = {A 9th-Order Continuous Time Sigma-Delta-ADC with X-Coupled Differential Single-Opamp Resonators},
    booktitle  = {{IEEE International Midwest Symposium on Circuits and Systems}},
    year  = {2011},
    month  = {08},
    pages  = {1--4},
    issn  = {1548-3746},
    doi  = {10.1109/MWSCAS.2011.6026508},
    location  = {Seoul, KR},
    publisher  = {IEEE},
    keywords  = {continuous time systems,differential amplifiers,integrating circuits,operational amplifiers,poles and zeros,conjugate complex zeros},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1617},
    abstract  = {Continuous time Sigma-Delta-ADCs are usually designed with noise transfer functions containing conjugate complex zeros to extend the usable bandwidth. Traditionally, these zeros are implemented with a resonance generated by feedback around two integrator opamps.},
    }
  • [DOI] R. Weigel, M. Frick, and R. Eidher, "A Method to Determine the Injected Real Power into an IC Pin in Case of a Conducted Immunity EMC Test" in IEEE International Symposium on Electromagnetic Compatibility, 2011, pp. 850-854. [Bibtex]
    @inproceedings{weigel2011e,
    author  = {Weigel, Robert and Frick, Marco and Eidher, R.},
    title  = {A Method to Determine the Injected Real Power into an IC Pin in Case of a Conducted Immunity EMC Test},
    booktitle  = {{IEEE International Symposium on Electromagnetic Compatibility}},
    year  = {2011},
    month  = {08},
    pages  = {850--854},
    issn  = {2158-110X},
    doi  = {10.1109/ISEMC.2011.6038427},
    location  = {Long Beach, CA, USA},
    publisher  = {IEEE},
    keywords  = {S-parameters,electromagnetic compatibility,integrated circuit testing,printed circuits,IC Pin,S-parameters,conducted immunity EMC test,injected real power},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1605},
    abstract  = {The direct power injection (DPI) measurement method is an internationally accepted technique to verify the robustness of an integrated circuit (IC) against an injected RF signal. The requirements of this measurement method respecting the setup is fixed in the international standard IEC 62132-4 [1]. In this paper a method is presented which allows to determine the real power injection into the IC pin by considering the influence of the required test printed circuit board (PCB). To apply this method only the transmitted and reflected RF power, the voltage standing wave ratio (VSWR), which are already locked during the DPI test, and the scattering parameters (S-parameters) of the PCB injection path are needed. How to use the available measurement results and how to determine the required S-parameters of the PCB injection path is described in this paper.},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, D. Kissinger, and R. Weigel, "Fast and accurate design methodology for millimeter-wave integrated circuits (invited)" in URSI General Assembly Scientific Symposium, 2011, pp. 1-4. [Bibtex]
    @inproceedings{laemmle2011,
    author  = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar and Weigel, Robert},
    title  = {Fast and accurate design methodology for millimeter-wave integrated circuits (invited)},
    booktitle  = {{URSI General Assembly Scientific Symposium}},
    year  = {2011},
    month  = {08},
    pages  = {1--4},
    location  = {Istanbul, Turkey},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1151},
    }
  • A. Gabiger-Rose, R. Rose, M. Kube, P. Schmitt, and R. Weigel, "Noise-adaptive bilateral filtering of projections for Computed Tomography" in 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 2011, pp. 306-309. [Bibtex]
    @inproceedings{gabiger-rose2011a,
    author  = {Gabiger-Rose, Anna and Rose, Richard and Kube, Matthias and Schmitt, Peter and Weigel, Robert},
    title  = {Noise-adaptive bilateral filtering of projections for Computed Tomography},
    booktitle  = {{11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine}},
    year  = {2011},
    month  = {07},
    day  = {15},
    pages  = {306--309},
    location  = {Potsdam, Germany},
    publisher  = {Society of High Performance Computational Imaging (SHPCI)},
    url  = {http://www.fully3d.org/2011/Fully3D2011Proceedings.pdf},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/874},
    abstract  = {In this work, the image quality enhancement of CT images via filtering of noise in the projections is shown. For denoising, a noise-adaptively adjustable bilateral filter is exerted. The application area of the presented work is nondestructive testing in the industry. Bilateral filtering incorporates the combination of domain and range filtering. The domain filter averages the nearby pixel values and acts thereby as a low-pass filter. The range filter stands for the nonlinear component and plays an important part in edge preserving. These filter components both can be adjusted by corresponding parameters. In this paper, the way is presented how the parameter for the adjustment of the nonlinear component can be derived from the standard deviation of noise. This approach allows to increase the PSNR_dB while retaining the structural similarity MSSIM at a high level. Using the proposed method for the calculation of the range filter parameter an automatic noise-adaptive tuning of the noise filter is possible. Moreover filter tuning is effective for any noise level. Besides the increase of the PSNR_dB and of the MSSIM it is demonstrated, that owing to the bilateral filtering of projections the detectability of the low contrast details in CT images can be improved. As long as the details can be distinguished from noise, it is possible to enhance the contrast resolution of these details due to the bilateral filtering of projections using our proposed filter adjustment.},
    }
  • [DOI] S. Zeller, C. Münker, and R. Weigel, "A X-coupled differential single-opamp resonator for low power continuous time Sigma-Delta-ADCs" in Conference on Ph.D. Research in Microelectronics and Electronics, 2011, pp. 233-236. [Bibtex]
    @inproceedings{zeller2011,
    author  = {Zeller, Sebastian and Münker, Christian and Weigel, Robert},
    title  = {A X-coupled differential single-opamp resonator for low power continuous time Sigma-Delta-ADCs},
    booktitle  = {{Conference on Ph.D. Research in Microelectronics and Electronics}},
    year  = {2011},
    month  = {07},
    pages  = {233--236},
    doi  = {10.1109/PRIME.2011.5966276},
    location  = {Trento, IT},
    publisher  = {IEEE},
    keywords  = {differential amplifiers,feedback amplifiers,low-power electronics,operational amplifiers,resonator filters,sigma-delta modulation},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1609},
    abstract  = {Continuous time sigma-delta ADCs usually are designed with noise transfer functions containing conjugate complex zeros to extend the usable bandwidth. Traditionally, these zeros are implemented with a resonance generated by local feedback around two integrators. Recently a loop filter topology with reduced number of opamps based on modified Twin-T single-opamp resonators has been proposed with the aim to reduce power dissipation. In this work, we propose an alternative differential single opamp resonator with cross-coupled feedback, which is more compact, more power efficient, more robust to parasitics and more linear than the Twin-T based single-opamp resonators.},
    }
  • T. Ußmüller, J. Heidrich, D. Brenk, J. Essel, G. Fischer, and R. Weigel, "Distance Measurement with UHF RFID Transponders" in IEEE MTT-S International Microwave Symposium, Workshop on Innovative and Highly Accurate Local Positioning Systems, 2011. [Bibtex]
    @inproceedings{ussmueller2011b,
    author  = {Ußmüller, Thomas and Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Fischer, Georg and Weigel, Robert},
    title  = {Distance Measurement with UHF RFID Transponders},
    booktitle  = {{IEEE MTT-S International Microwave Symposium, Workshop on Innovative and Highly Accurate Local Positioning Systems}},
    year  = {2011},
    month  = {06},
    location  = {Baltimore,MD, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1283},
    }
  • A. Ferizi, M. Jung, and R. Weigel, "A 24 GHz Wireless Sensor Network with High Precision Local Positioning Capability" in IMS 2011 Workshop: Smart Wireless Sensor Networks (MTT-S), 2011. [Bibtex]
    @inproceedings{ferizi2011,
    author  = {Ferizi, Alban and Jung, Melanie and Weigel, Robert},
    title  = {A 24 GHz Wireless Sensor Network with High Precision Local Positioning Capability},
    booktitle  = {{IMS 2011 Workshop: Smart Wireless Sensor Networks (MTT-S)}},
    year  = {2011},
    month  = {06},
    day  = {10},
    location  = {Baltimore, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/767},
    }
  • R. Weigel, G. Vinci, B. Lämmle, and A. Koelpin, "A New Concept for Aligning Automotive Long-Range Radar Modules Based on Wireless Microwave Sensing" in Sensor & Test, 2011. [Bibtex]
    @inproceedings{weigel2011d,
    author  = {Weigel, Robert and Vinci, Gabor and Lämmle, Benjamin and Koelpin, Alexander},
    title  = {A New Concept for Aligning Automotive Long-Range Radar Modules Based on Wireless Microwave Sensing},
    booktitle  = {{Sensor & Test}},
    year  = {2011},
    month  = {06},
    location  = {Nuremberg, Germany},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/673},
    }
  • [DOI] J. Stellet, C. Kutzera, and R. Weigel, "Optimale Geradenschaetzung fuer Time-of-Flight Umfeldsensoren", tm - Technisches Messen, vol. 78, iss. 6, pp. 286-291, 2011. [Bibtex]
    @article{stellet2011,
    author  = {Stellet, J. and Kutzera, Christian and Weigel, Robert},
    title  = {Optimale Geradenschaetzung fuer Time-of-Flight Umfeldsensoren},
    journal  = {{tm - Technisches Messen}},
    year  = {2011},
    month  = {06},
    pages  = {286--291},
    issn  = {2196-7113},
    doi  = {10.1524/teme.2011.0114},
    publisher  = {De Gruyter},
    volume  = {78},
    number  = {6},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1607},
    abstract  = {Dieser Artikel stellt einen verbesserten Algorithmus zur Geradenschaetzung fuer Umfeldsensoren vor. Eine optimale Schaetzung ist nur moeglich, wenn die stochastischen Eigenschaften der Messfehler beruecksichtigt werden. Lidar- und Ultraschallsensoren erfassen die radiale Entfernung rund den Azimutwinkel ϕ. Deshalb ist es sinnvoll, unkorrelierte Messfehler in Polarkoordinaten anzunehmen. Schaetzverfahren, die die daraus folgende Korrelation in kartesischen Koordinaten nicht beruecksichtigen, koennen daher einen systematischen Schaetzfehler aufweisen. Zwei neuere Ansaetze zur Maximum-Likelihood-Schätzung der Geradenparameter werden hier vorgestellt und es wird die Verbesserung eines der Verfahren vorgeschlagen.},
    }
  • [DOI] A. Koelpin, G. Vinci, B. Lämmle, and R. Weigel, "The enhanced six-port receiver: A new concept for simultaneous data reception and direction of arrival detection" in International Microwave Symposium 2011, 2011. [Bibtex]
    @inproceedings{koelpin2011,
    author  = {Koelpin, Alexander and Vinci, Gabor and Lämmle, Benjamin and Weigel, Robert},
    title  = {The enhanced six-port receiver: A new concept for simultaneous data reception and direction of arrival detection},
    booktitle  = {{International Microwave Symposium 2011}},
    year  = {2011},
    month  = {06},
    day  = {05},
    isbn  = {978-1-61284-754-2},
    doi  = {10.1109/MWSYM.2011.5972688},
    location  = {Baltimore, MD, USA},
    publisher  = {IEEE},
    keywords  = {Ad hoc networks,Antennas,Equations,Microwave Circuits,Microwave Communication,Receivers,Direction of arrival,Six-Port},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1033},
    abstract  = {The key benefits of the six-port receiver architecture, being a special type of direct conversion receivers, are its high bandwidth and low circuit complexity. This concept has been known on the one hand for precise phase measurement applications and on the other hand for complex valued data reception in the millimeter wave region. The work presented here shows a new approach for combining both principles in one six-port receiver. For the first time a method for simultaneous data reception and direction of arrival (DOA) detection will be presented requiring only one enhanced six-port front-end.},
    }
  • R. Weigel and M. Dudek, "Advanced Millimeter-Wave FMCW Radar System Simulations for Automotive Applications" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2011. [Bibtex]
    @inproceedings{weigel2011b,
    author  = {Weigel, Robert and Dudek, Manuel},
    title  = {Advanced Millimeter-Wave FMCW Radar System Simulations for Automotive Applications},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2011},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1616},
    }
  • R. Weigel, G. Fischer, S. Zorn, R. Rose, and A. Götz, "Ortung von GSM Mobiltelefonen zur Vermissten- und Verschuettetensuche" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2011. [Bibtex]
    @inproceedings{weigel2011c,
    author  = {Weigel, Robert and Fischer, Georg and Zorn, Stefan and Rose, Richard and Götz, Alexander},
    title  = {Ortung von GSM Mobiltelefonen zur Vermissten- und Verschuettetensuche},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2011},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1612},
    }
  • [DOI] R. Agethen, L. Reuter, F. Lurz, G. Fischer, R. Weigel, and D. Kissinger, "A compact medical platform for mobile sensor fusion and data communication" in IEEE International Workshop on Medical Measurements and Applications Proceedings(MeMeA), 2011, pp. 111-114. [Bibtex]
    @inproceedings{agethen2011,
    author  = {Agethen, Roman and Reuter, Lukas and Lurz, Fabian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    title  = {A compact medical platform for mobile sensor fusion and data communication},
    booktitle  = {{IEEE International Workshop on Medical Measurements and Applications Proceedings(MeMeA)}},
    year  = {2011},
    month  = {05},
    pages  = {111--114},
    doi  = {10.1109/MeMeA.2011.5966696},
    location  = {Bari, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1150},
    }
  • J. Walk, B. Eskofier, J. Spallek, and L. Reuter, "Mobile und stationaere Gesundheitsassistenzsysteme - der Markt der Zukunft?" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2011. [Bibtex]
    @inproceedings{walk2011b,
    author  = {Walk, Jasmin and Eskofier, Björn and Spallek, Johannes and Reuter, Lukas},
    title  = {Mobile und stationaere Gesundheitsassistenzsysteme - der Markt der Zukunft?},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2011},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1614},
    }
  • M. Jung, A. Ferizi, and R. Weigel, "Lokalisierung in Sensornetzwerken und deren Basisbandverarbeitung", HF-Praxis, vol. 16, pp. 33-37, 2011. [Bibtex]
    @article{jung2011,
    author  = {Jung, Melanie and Ferizi, Alban and Weigel, Robert},
    title  = {Lokalisierung in Sensornetzwerken und deren Basisbandverarbeitung},
    journal  = {{HF-Praxis}},
    year  = {2011},
    month  = {05},
    pages  = {33--37},
    issn  = {1614-743X},
    publisher  = {Beam-Verlag},
    volume  = {16},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/779},
    abstract  = {Die Vielfalt der Lokalisierung- und Ortungssysteme stieg in den vergangenen Jahren rasant an. Neben den bekannten Ortungsverfahren über Galileo und GPS im privaten und industriellen Einsatz gewinnt die Lokalisierung innerhalb von Gebäuden immer mehr an Bedeutung. Hierbei sind besonders die meist auf FMCW (Frequency Modulated Continuous Wave) basierenden Sensornetzwerke hervorzuheben, die eine Vielzahl an Einsatzmöglichkeiten erlauben. Die Verbesserung von Produktionsabläufen durch Positionsbestimmung von Waren, Produktionsmitteln oder Maschinen ist ein mögliches Einsatzgebiet, aber auch die verbesserte Orientierung von Feuerwehr oder anderen Einsatzkräften in Gebäuden ist denkbar. Im Gegensatz zu satellitengestützten Ortungssystemen entstehen bei lokalen Systemen innerhalb von Gebäuden mehr Reflektionen des Signals an Oberflächen. Um die damit verbundene Mehrwegeausbreitung bestmöglich zu handhaben, bestehen hohe Anforderungen an das System und die Signalverarbeitung im Basisband. In diesem Beitrag wird die CMOS Signalverarbeitung im Basisband für einen Sensorknoten mit Lokalisierung näher beleuchtet. Diese wird im Gegensatz zu anderen Ansätzen vollständig in CMOS auf einem Chip realisiert, um so Platz- und Energiebedarf zu reduzieren. Auf diese Weise werden die Massenfabrikation und der großflächige Einsatz erleichtert.},
    }
  • H. Schumacher, A. C. Ulusoy, and G. Liu, "Low-cost 60 GHz GBit/s BPSK/OPSK receiver with analog demodulation" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2011. [Bibtex]
    @inproceedings{schumacher2011,
    author  = {Schumacher, Hermann and Ulusoy, A.C. and Liu, G.},
    title  = {Low-cost 60 GHz GBit/s BPSK/OPSK receiver with analog demodulation},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2011},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1615},
    }
  • R. Mzyk, G. Dehm-Andone, and F. Hausknecht, "Discussion on Receiver Topologies in the Context of Intelligence Applications" in Electrical and Electronic Engineering for Communication, 2011. [Bibtex]
    @inproceedings{mzyk2011,
    author  = {Mzyk, Raphael and Dehm-Andone, Gunther and Hausknecht, Frank},
    title  = {Discussion on Receiver Topologies in the Context of Intelligence Applications},
    booktitle  = {{Electrical and Electronic Engineering for Communication}},
    year  = {2011},
    month  = {05},
    location  = {Ulm, Germany},
    keywords  = {scanning receiver,Intelligence,receiver topologies,KAIMAN},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/366},
    }
  • [DOI] M. Hofmann, T. Fersch, R. Weigel, G. Fischer, and D. Kissinger, "A novel approach to non-invasive blood glucose measurement based on RF transmission" in IEEE International Workshop on Medical Measurements and Applications, 2011, pp. 39-42. [Bibtex]
    @inproceedings{hofmann2011b,
    author  = {Hofmann, Maximilian and Fersch, Thomas and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    title  = {A novel approach to non-invasive blood glucose measurement based on RF transmission},
    booktitle  = {{IEEE International Workshop on Medical Measurements and Applications}},
    year  = {2011},
    month  = {05},
    day  = {29},
    pages  = {39--42},
    isbn  = {978-1-4244-9336-4},
    doi  = {10.1109/MeMeA.2011.5966704},
    location  = {Bari, Italy},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/675},
    abstract  = {A new approach to non-invasive blood parameter measuring is presented, which consists of two matched antennas for transmission based two port measurements. The current situation of patients suffering from diabetes mellitus and their need for novel blood sugar level measuring techniques is presented. Dielectric properties of body tissues are reviewed and their influence on transmission properties are estimated for plane wave propagation. A covered patch antenna and substrate integrated waveguide slot antenna has been designed, measured and compromised for glucose-concentration measurements. Further, several test locations are discussed with respect to an accurate measurement. The introduced antennas were optimized and fabricated with respect to the dielectric and mounting properties of human tissues.},
    }
  • G. Fischer, "Kognitives Spektrumsmanagement fuer professionelle Funkmikrofone (PMSE) - ETSI STF386" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, 2011. [Bibtex]
    @inproceedings{fischer2011,
    author  = {Fischer, Georg},
    title  = {Kognitives Spektrumsmanagement fuer professionelle Funkmikrofone (PMSE) - ETSI STF386},
    booktitle  = {{Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse}},
    year  = {2011},
    month  = {05},
    location  = {Ulm, DE},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/1613},
    }
  • [DOI] M. Dudek, D. Kissinger, R. Weigel, and G. Fischer, "Consideration of higher frequency bands in accurate millimeter-wave FMCW-radar system simulations for automotive applications" in Wireless and Microwave Technology Conference, 2011, pp. 1-4. [Bibtex]
    @inproceedings{dudek2011a,
    author  = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    title  = {Consideration of higher frequency bands in accurate millimeter-wave FMCW-radar system simulations for automotive applications},
    booktitle  = {{Wireless and Microwave Technology Conference}},
    year  = {2011},
    month  = {04},
    day  = {18},
    pages  = {1--4},
    isbn  = {978-1-61284-081-9},
    doi  = {10.1109/WAMICON.2011.5872879},
    location  = {Clearwater Beach, USA},
    note  = {published},
    uri  = {http://dspace.lte.eei.uni-erlangen.de/handle/123456789/681},
    abstract  = {In this paper we demonstrate the necessity of taking harmonic bands into account when performing accurate simulations for millimeter-wave frequency-modulated continuous-wave (FMCW) radar systems. Especially under nonlinear conditions when harmonics are generated and influence the signal quality of target detection the higher frequency bands cannot be neglected anymore. In ordinary