Leitung

Prof. Dr.-Ing. Dr.-Ing. habil. Robert Weigel

Kontakt

  • E-Mail:
  • Telefon: 09131/85-27200
  • Fax: 09131/302951
  • Raum: 4.21
  • Cauerstraße 9
    91058 Erlangen

Über Robert Weigel

Curriculum Vitae

Robert Weigel was born in Ebermannstadt, Germany, in 1956. He received the Dr.-Ing. and the Dr.-Ing.habil. degrees, both in electrical engineering and computer science, from the Munich University of Technology in Germany, in 1989 and 1992, respectively. From 1982 to 1988, he was a Research Engineer, from 1988 to 1994 a Senior Research Engineer, and from 1994 to 1996 a Professor for RF Circuits and Systems at the Munich University of Technology. In winter 1994/95 he was a Guest Professor for SAW Technology at Vienna University of Technology in Austria. From 1996 to 2002, he has been Director of the Institute for Communications and Information Engineering at the University of Linz, Austria. In August 1999, he co-founded DICE - Danube Integrated Circuit Engineering, Linz, meanwhile an Infineon Technologies Design Center (DICE) and an Intel company (DMCE) which are devoted to the design of, respectively, industrial electronics and mobile radio electronics. In 2000, he has been appointed a Professor for RF Engineering at the Tongji University in Shanghai, China. Also in 2000, he co-founded the Linz Center of Competence in Mechatronics, meanwhile also a company. Since 2002 he is head of the Institute for Electronics Engineering at the University of Erlangen-Nuremberg, Germany. In 2009 and 2012, respectively, he co-founded eesy-id in Erlangen and eesy-ic in Nuremberg, both dealing with electronics engineering.

He has been engaged in research and development on microwave theory and techniques, integrated optics, high-temperature superconductivity, SAW technology, digital and microwave communication systems, automotive EMC. In these fields, he has published more than 700 papers and given about 300 international presentations. His review work includes European and Asian research projects and international journals. In 2002, he received the German ITG Award, and in 2007 the IEEE Microwave Applications Award.

Dr. Weigel is a Fellow of IEEE, a member of the The Electromagnetics Academy, and a member of the German VDE and the Austrian ÖVE. He serves on several editorial boards such as the Proceedings of the IEEE and advisory boards of companies and research institutes. He is the elected speaker of the Electrical Engineering Faculty of the German Research Foundation (DFG) and an elected member of the German National Academy of Science and Engineering (acatech). Within IEEE MTT-S, he has been Founder and Chair of the Austrian COM/MTT Joint Chapter, Region 8 Coordinator and, during 2001 to 2003 Distinguished Microwave Lecturer. He is an AdCom Member and Chair of MTT-2 Microwave Acoustics. Dr. Weigel is the General Chairman of the 2013 European Microwave Week in Nuremberg, Germany.

Lehrveranstaltungen Sommersemester 2017

Lehrveranstaltungen Wintersemester 2017

Preise & Auszeichnungen

  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, Second Prize Student Paper Competition, IEEE Radio and Wireless Week, 2017. [Bibtex]
    @prize{will_prize2017,
    abstract = {For the paper "Segmental Polynomial Approximation based phase error correction for precise near field displacement measurements using six-port microwave interferometers},
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {will_prize2017},
    year = {2017},
    month = {01},
    day = {18},
    title = {Second Prize Student Paper Competition},
    }
  • M. Kloc, R. Weigel, and A. Koelpin, Best Conference Paper Award, Advances in Wireless and Optical Communications (RTUWO), 2016. [Bibtex]
    @prize{kloc_prize_2016,
    abstract = {Enhancing the Real-Time Performance of a Wireless Hardware-in-the-Loop TestSystem in ISM Bands},
    author = {Kloc, Matej and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Advances in Wireless and Optical Communications (RTUWO)},
    cris = {kloc_prize_2016},
    year = {2016},
    month = {11},
    day = {04},
    title = {Best Conference Paper Award},
    }
  • R. Weigel, IEEE MTT-S Distinguished Educator Award, IEEE Microwave Theory and Techniques Society, 2016. [Bibtex]
    @prize{weigel_prize_2016,
    abstract = {Recognizes a distinguished educator in the field of microwave engineering and science who best exemplifies the special human qualities of Fred Rosenbaum, who considered teaching a high calling and demonstrated his dedication to the Society through tireless service},
    author = {Weigel, Robert},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {weigel_prize_2016},
    year = {2016},
    month = {05},
    day = {01},
    title = {IEEE MTT-S Distinguished Educator Award},
    }
  • R. Weigel, Distinguished Recipient of MIKON Recognitions, MIKON, 2016. [Bibtex]
    @prize{weigel_prize_2016a,
    abstract = {In recognition of outstanding contributions to the technical program of MIKON Conferences over the years and to promotion of MIKON among the world's microwave community.},
    author = {Weigel, Robert},
    booktitle = {MIKON},
    cris = {weigel_prize_2016a},
    year = {2016},
    month = {05},
    day = {11},
    title = {Distinguished Recipient of MIKON Recognitions},
    }
  • C. Will, F. Lurz, K. Shi, R. Weigel, and A. Koelpin, Excellent Demo Track Presentation, Radio and Wireless Week, 2016. [Bibtex]
    @prize{will_prize_2016,
    abstract = {For an exemplary demonstration of: Android-based Real Time Heartbeat Detection Using a Microwave Radar},
    author = {Will, Christoph and Lurz, Fabian and Shi, Kilin and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Radio and Wireless Week},
    cris = {will_prize_2016},
    year = {2016},
    month = {01},
    day = {25},
    title = {Excellent Demo Track Presentation},
    }
  • M. Sporer, F. Lurz, E. Schlücker, R. Weigel, and A. Koelpin, WiSNet Student Paper Competition, Second Place, IEEE Microwave Theory and Techniques Society (MTT-S), 2015. [Bibtex]
    @prize{sporer_prize_2015,
    abstract = {Underwater Interferometric Radar Sensor for Distance and Vibration Measurement},
    author = {Sporer, Michael and Lurz, Fabian and Schlücker, Eberhard and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Microwave Theory and Techniques Society (MTT-S)},
    cris = {sporer_prize_2015},
    year = {2015},
    month = {01},
    day = {28},
    title = {WiSNet Student Paper Competition, Second Place},
    }
  • J. Nehring, M. Bartels, R. Weigel, and D. Kissinger, First Place Student Paper Competition, IEEE Microwave Theory and Techniques Society, 2015. [Bibtex]
    @prize{nehring_prize_2015,
    abstract = {A Permittivity Sensitive Phase-Locked Loop Based on a Silicon-Integrated Capacitive Sensor for Microwave Biosensing Applications},
    author = {Nehring, Johannes and Bartels, Melanie and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {nehring_prize_2015},
    year = {2015},
    month = {01},
    day = {28},
    title = {First Place Student Paper Competition},
    }
  • F. Lurz, S. Mann, S. Linz, S. Lindner, R. Weigel, and A. Koelpin, RWW2015 Best Demonstration Award - 2nd place, 2015 IEEE Radio and Wireless Week, 2015. [Bibtex]
    @prize{lurz_prize_2015,
    author = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {2015 IEEE Radio and Wireless Week},
    cris = {lurz_prize_2015},
    year = {2015},
    month = {01},
    day = {28},
    title = {RWW2015 Best Demonstration Award - 2nd place},
    }
  • M. Hierold, S. Ripperger, D. Josic, F. Mayer, R. Weigel, and A. Koelpin, Best Paper Award, IEEE Topical Conference on Wireless Sensors and Sensor Networks, 2015. [Bibtex]
    @prize{hierold_prize_2015,
    abstract = {Paper: "Low-Weight Sensor Network for Encounter Detection of Bats"},
    author = {Hierold, Martin and Ripperger, Simon and Josic, Darija and Mayer, Frieder and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {hierold_prize_2015},
    year = {2015},
    month = {01},
    day = {28},
    title = {Best Paper Award},
    }
  • J. Fuhrmann, P. Oßmann, K. Dufrene, H. Pretl, and R. Weigel, PAWR Student Paper Competition - First Place, IEEE Microwave Theory and Techniques Society, 2015. [Bibtex]
    @prize{fuhrmann_prize_2015,
    abstract = {Fü das Paperr: A 28nm Standard CMOS Watt-Level Power Amplifier for LTE Applications},
    author = {Fuhrmann, Jörg and Oßmann, Patrick and Dufrene, Krzysztof and Pretl, Harald and Weigel, Robert},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {fuhrmann_prize_2015},
    year = {2015},
    month = {01},
    day = {28},
    title = {PAWR Student Paper Competition - First Place},
    }
  • J. A. Chicharro, R. Weigel, and G. Fischer, CATRENE 2014 Innovation Award – Most Innovative Project, Cluster for Application and Technology Research in Europe on NanoElectronics, 2014. [Bibtex]
    @prize{chicarro_prize_2014,
    abstract = {für das Projekt "Elektromagnetische Zuverlässigkeit und elektronische Systeme für eMobility-Anwendungen (EM4EM)"},
    author = {Chicharro, José Antonio and Weigel, Robert and Fischer, Georg},
    booktitle = {Cluster for Application and Technology Research in Europe on NanoElectronics},
    cris = {chicarro_prize_2014},
    year = {2014},
    month = {11},
    day = {28},
    title = {CATRENE 2014 Innovation Award – Most Innovative Project},
    }
  • S. Mann, S. Lindner, F. Barbon, S. Linz, A. Talai, R. Weigel, and A. Koelpin, Best Paper Award, IEEE Topical Conference on Wirless Sensors and Sensor Networks, 2014. [Bibtex]
    @prize{mann_prize_2014,
    author = {Mann, Sebastian and Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Topical Conference on Wirless Sensors and Sensor Networks},
    cris = {mann_prize_2014},
    year = {2014},
    month = {01},
    day = {23},
    title = {Best Paper Award},
    }
  • A. Talai, S. Mann, R. Weigel, and A. Koelpin, Second Best Paper Award, IEEE Topical Conference on Wirless Sensors and Sensor Networks, 2014. [Bibtex]
    @prize{talai_prize_2014,
    abstract = {Water Temperature Measurement by Microwave Six-Port Interferometry at 24 GHz},
    author = {Talai, Armin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Topical Conference on Wirless Sensors and Sensor Networks},
    cris = {talai_prize_2014},
    year = {2014},
    month = {01},
    day = {21},
    title = {Second Best Paper Award},
    }
  • A. Bauch, M. Hofmann, R. Weigel, and D. Kissinger, Certificate of Recognition, European Microwave Conference, 2014. [Bibtex]
    @prize{oborovski_prize_2014,
    author = {Bauch, Andreas and Hofmann, Maximilian and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {European Microwave Conference},
    cris = {oborovski_prize_2014},
    year = {2014},
    title = {Certificate of Recognition},
    }
  • Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, Best student paper award, Mediterranean Microwave Symposium, 2009. [Bibtex]
    @prize{abou-chahine_prize_2013,
    author = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    booktitle = {Mediterranean Microwave Symposium},
    cris = {abou-chahine_prize_2013},
    year = {2009},
    title = {Best student paper award},
    }
  • R. Weigel, IEEE Microwave Application Award, IEEE Microwave Theory and Techniques Society (MTT-S), 2007. [Bibtex]
    @prize{weigel_prize_2007,
    author = {Weigel, Robert},
    booktitle = {IEEE Microwave Theory and Techniques Society (MTT-S)},
    cris = {weigel_prize_2007},
    year = {2007},
    title = {IEEE Microwave Application Award},
    type = {8033-Preis / Ehrung},
    }
  • R. Weigel, Mitgliedschaft acatech - Deutsche Akademie der Technikwissenschaften, acatech - Deutsche Akademie der Technikwissenschaften. [Bibtex]
    @prize{weigel_prize_noyear,
    author = {Weigel, Robert},
    booktitle = {acatech - Deutsche Akademie der Technikwissenschaften},
    cris = {weigel_prize_noyear},
    title = {Mitgliedschaft acatech - Deutsche Akademie der Technikwissenschaften},
    type = {9146-Akademie-Mitgliedschaft},
    }

COPYRIGHT NOTICE: Copyright and all rights of the material above are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by the appropriate copyright. The material may not be reposted without the explicit permission of the copyright holder.

COPYRIGHT NOTICE FOR IEEE PUBLICATIONS: © IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

COPYRIGHT NOTICE FOR EUMA PUBLICATIONS: © EUMA. Personal use of this material is permitted. Permission from European Microwave Association(EUMA) must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Patente

  • F. Seifert, R. Weigel, and Z. Zhang, Codemoduliertes Uebertragungsverfahren und nach diesem Uebertragungsverfahren arbeitendes Uebertragungssystem, 1997. [Bibtex]
    @patent{seifert_patent_1997,
    abstract = {Die Erfindung betrifft ein codemoduliertes Uebertragungsverfahren und ein nach diesem Uebertragungsverfahren arbeitendes Uebertragungssystem gemaeß Oberbegriff des Patentanspruches 1 bzw. des Patentanspruches 7. Ein derartiges Uebertragungsverfahren und Uebertragungssystem sind bereits aus der deutschen Offenlegungsschrift DE 4333 396 A1 bekannt.},
    author = {Seifert, Franz and Weigel, Robert and Zhang, Zhongping},
    cris = {seifert_patent_1997},
    year = {1997},
    month = {08},
    day = {07},
    number = {EP0878064B1},
    title = {Codemoduliertes Uebertragungsverfahren und nach diesem Uebertragungsverfahren arbeitendes Uebertragungssystem},
    type = {patent},
    url = {http://ip.com/pat/EP0878064B1},
    }

COPYRIGHT NOTICE: Copyright and all rights of the material above are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by the appropriate copyright. The material may not be reposted without the explicit permission of the copyright holder.

COPYRIGHT NOTICE FOR IEEE PUBLICATIONS: © IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

COPYRIGHT NOTICE FOR EUMA PUBLICATIONS: © EUMA. Personal use of this material is permitted. Permission from European Microwave Association(EUMA) must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publikationen

2017

  • J. Rimmelspacher, A. Hagelauer, R. Weigel, and V. Issakov, "Experimental Study of Injected Interference Effects on Modulated Sidebands in CMOS LC VCO" in International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS) 2017, David Intercontinental Hotel, Tel Aviv, Israel, 2017 (to be published). [Bibtex]
    @inproceedings{rimmelspacher2017a,
    abstract = {This paper presents an experimental study on modulated sidebands in the output spectrum of a millimeterwave (mm-wave) CMOS voltage controlled oscillator (VCO). The results are used to calculate the injected current into the resonant tank in dependency on its locking range. The evaluated parameters are a measure of the oscillator’s sensitivity regarding injected periodic interferences. This is of interest when implemented in highly integrated systems, as e.g. in system-on-chip solutions.},
    author = {Rimmelspacher, Johannes and Hagelauer, Amelie and Weigel, Robert and Issakov, Vadim},
    language = {English},
    booktitle = {International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS) 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1071984},
    year = {2017},
    month = {11},
    day = {13},
    eventdate = {2017-11-13/2017-11-15},
    faupublication = {yes},
    keywords = {injection locking,injection pulling,interference,modulated sidebands,millimeter-wave oscillator,CMOS technolog},
    note = {unpublished},
    peerreviewed = {automatic},
    title = {Experimental Study of Injected Interference Effects on Modulated Sidebands in CMOS LC VCO},
    venue = {David Intercontinental Hotel, Tel Aviv, Israel},
    }
  • S. Mueller, S. Danzeca, R. Garcia Alía, M. Brugger, R. Weigel, and A. Koelpin, "Advanced In-Situ Instrumentation of RF Circuits for Mixed-Field Irradiation Testing Purpose" in European Conference on Radiation and its Effects on Components and Systems (RADECS), , Switzerland, 2017 (to be published). [Bibtex]
    @inproceedings{mueller2018,
    author = {Mueller, Steffen and Danzeca, Salvatore and Garcia Alía, Rubén and Brugger, Markus and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {European Conference on Radiation and its Effects on Components and Systems (RADECS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1067164},
    year = {2017},
    month = {10},
    day = {02},
    eventdate = {2017-10-02/2017-10-06},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {unknown},
    title = {Advanced In-Situ Instrumentation of RF Circuits for Mixed-Field Irradiation Testing Purpose},
    type = {Konferenzschrift},
    venue = {, Switzerland},
    }
  • F. Michler, S. Lindner, F. Lurz, S. Erhardt, R. Weigel, and A. Koelpin, "Zero-Bias Schottky Power Detector Design for Six-Port based Radar Systems" in European Microwave Conference, Nürnberg, 2017 (to be published). [Bibtex]
    @inproceedings{michler2017,
    author = {Michler, Fabian and Lindner, Stefan and Lurz, Fabian and Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061108},
    year = {2017},
    month = {10},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {automatic},
    title = {Zero-Bias Schottky Power Detector Design for Six-Port based Radar Systems},
    venue = {Nürnberg},
    }
  • A. Bauch, M. Dietz, R. Weigel, A. Hagelauer, and D. Kissinger, "A Broadband 10-95 GHz Variable Gain Amplifier in a 130 nm BiCMOS Technology" in European Microwave Week 2017, Nuremberg, Germany, 2017. [Bibtex]
    @inproceedings{bauch2017,
    author = {Bauch, Andreas and Dietz, Marco and Weigel, Robert and Hagelauer, Amelie and Kissinger, Dietmar},
    booktitle = {European Microwave Week 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1063469},
    year = {2017},
    month = {10},
    day = {08},
    eventdate = {2017-10-08/2017-10-13},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Broadband 10-95 GHz Variable Gain Amplifier in a 130 nm BiCMOS Technology},
    type = {Konferenzschrift},
    venue = {Nuremberg, Germany},
    }
  • M. Völkel, H. Hirsch, M. Dietz, R. Weigel, A. Hagelauer, and D. Kissinger, "A Low-Power 120-GHz Integrated Sixport Receiver Front-End with Digital Adjustable Gain in a 130-nm BiCMOS Technology" in BCTM, Florida, 2017 (to be published). [Bibtex]
    @inproceedings{voelkel2017b,
    abstract = {In this paper a 120GHz monolithic low-power
    sixport receiver front-end including two variable gain amplifiers,
    a passive sixport network, four detectors and a digital serial
    interface (SPI) is presented. The measurement principle is based
    on the additive superposition of two incident millimeter-wave
    signals, whereas the superposition must be fulfilled under special
    conditions. After power detection, the quadrature components
    can be extracted. The proposed measurement system is well
    suited for industrial radar applications, as well as for biomedical
    applications and it is further more well suited for communication
    systems. The receiver has been designed using a 0.13µm SiGe
    BiCMOS process from IHP (SG13G2). The whole integrated
    circuit has a size of 1560µm x 900µm and only consumes
    102.3mW from a 3.3V supply. The receiver exhibits a 1 dB
    compression point of -13dBm at the center frequency. The
    bandwidth is 15.5 GHz and covers the lower part of the D-Band.
    The gain of the input amplifier can be adjusted from 3 to 16 dB
    by a digital interface. The maximum power consumption of the
    VGA is 46.2mW.}, author = {Völkel, Matthias and Hirsch, Hartmut and Dietz, Marco and Weigel, Robert and Hagelauer, Amelie and Kissinger, Dietmar}, language = {English}, booktitle = {BCTM}, cris = {https://cris.fau.de/converis/publicweb/publication/1064977}, year = {2017}, month = {10}, day = {19}, eventdate = {2017-10-19/2017-10-21}, faupublication = {yes}, keywords = {industrial radar; communication receiver; interferometer; phase measurement; sixport; low power; SiGe BiCMOS; millimeter-wave}, note = {unpublished}, peerreviewed = {automatic}, title = {A Low-Power 120-GHz Integrated Sixport Receiver Front-End with Digital Adjustable Gain in a 130-nm BiCMOS Technology}, type = {undefined}, venue = {Florida}, }
  • S. Lindner, F. Lurz, S. Linz, R. Weigel, and A. Koelpin, "Mixer Assisted Interferometric Six-Port System for Accurate Distance Measurements" in European Radar Conference, Nürnberg, 2017 (to be published). [Bibtex]
    @inproceedings{lindner2017,
    author = {Lindner, Stefan and Lurz, Fabian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061126},
    year = {2017},
    month = {10},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {automatic},
    title = {Mixer Assisted Interferometric Six-Port System for Accurate Distance Measurements},
    venue = {Nürnberg},
    }
  • S. Mueller, R. Weigel, and A. Koelpin, "A Survey on Analog-to-Digital Converter Performance with Respect to Ionizing Radiation" in European Conference on Radiation and Its Effects on Components and Systems (RADECS), 2017 (to be published). [Bibtex]
    @inproceedings{mueller2017a,
    author = {Mueller, Steffen and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {European Conference on Radiation and Its Effects on Components and Systems (RADECS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1067677},
    year = {2017},
    month = {10},
    day = {31},
    eventdate = {2017-10-02/2017-10-06},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {unknown},
    title = {A Survey on Analog-to-Digital Converter Performance with Respect to Ionizing Radiation},
    type = {Konferenzschrift},
    }
  • M. Dietz, T. Girg, A. Bauch, K. Aufinger, A. Hagelauer, D. Kissinger, and R. Weigel, "Broadband Multi-Octave Receiver from 1-32 GHz for Monolithic Integrated Vector Network Analyzers (VNA) in SiGe-Technology" in European Microwave Week 2017, Nuremberg, Germany, 2017 (to be published). [Bibtex]
    @inproceedings{dietz2017,
    author = {Dietz, Marco and Girg, Thomas and Bauch, Andreas and Aufinger, Klaus and Hagelauer, Amelie and Kissinger, Dietmar and Weigel, Robert},
    booktitle = {European Microwave Week 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1064380},
    year = {2017},
    month = {10},
    day = {08},
    eventdate = {2017-10-08/2017-10-13},
    eventtitle = {European Microwave Week 2017},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {unknown},
    title = {Broadband Multi-Octave Receiver from 1-32 GHz for Monolithic Integrated Vector Network Analyzers (VNA) in SiGe-Technology},
    type = {Konferenzschrift},
    venue = {Nuremberg, Germany},
    }
  • E. Aguilar Mendoza, D. Kissinger, A. Hagelauer, and R. Weigel, "Design Optimization of a Low Power Wideband D-Band LNA in a 130 nm BiCMOS Technology for Imaging Applications" in IEEE Bipolar/BiCMOS Circuits and Technology Meeting, Miami, Florida, 2017 (to be published). [Bibtex]
    @inproceedings{aguilar2017,
    abstract = {This work presents a gain optimization technique
    for a D-Band Low Noise Amplifier manufactured in a 130 nm
    SiGe BiCMOS process for imaging applications. The architecture
    consists of a 3-stage cascode amplifier which achieves a maximum
    gain of 32.8 dB and a gain>20 dB in the frequency range from
    121 to 161 GHz with a DC power consumption of 39.6 mW.
    The measured noise figure varies from 6 to 9.7 dB within the
    range 130-140 GHz. To the best of the author’s knowledge, this
    circuit demonstrates the highest bandwidth achieved so far at DBand
    with a relatively low noise figure in a 130 nm node while
    maintaining a gain>20 dB over 70% of the whole D-Band}, author = {Aguilar Mendoza, Erick and Kissinger, Dietmar and Hagelauer, Amelie and Weigel, Robert}, language = {English}, booktitle = {IEEE Bipolar/BiCMOS Circuits and Technology Meeting}, cris = {https://cris.fau.de/converis/publicweb/publication/1064997}, year = {2017}, month = {10}, day = {19}, eventdate = {2017-10-19/2017-10-21}, faupublication = {yes}, keywords = {D-Band; Imaging; Radiometrie; LNA,SiGe,mm-wave}, note = {unpublished}, peerreviewed = {automatic}, title = {Design Optimization of a Low Power Wideband D-Band LNA in a 130 nm BiCMOS Technology for Imaging Applications}, type = {Konferenzschrift}, venue = {Miami, Florida}, }
  • S. Erhardt, R. Weigel, and A. Koelpin, "Receiving GSM Broadcast Channels with an Ultra-Low Power Sub-GHz Transceiver" in European Microwave Conference, Nürnberg, 2017 (to be published). [Bibtex]
    @inproceedings{erhardt2017,
    author = {Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1062043},
    year = {2017},
    month = {10},
    day = {08},
    eventdate = {2017-10-08/2017-10-13},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {Receiving GSM Broadcast Channels with an Ultra-Low Power Sub-GHz Transceiver},
    type = {Konferenzschrift},
    venue = {Nürnberg},
    }
  • V. Issakov, J. Rimmelspacher, S. Trotta, M. Tiebout, A. Hagelauer, and R. Weigel, "A 52-to-67 GHz Dual-Core Push-Push VCO in 40-nm CMOS" in European Microwave Week 2017, Nuremberg Convention Center, Nuremberg, Germany, 2017 (to be published). [Bibtex]
    @inproceedings{issakov2017a,
    abstract = {

    We present a continuously tunable 52-to-67 GHz push-push dual-core voltage-controlled oscillator (VCO) in a 40 nm bulk CMOS technology. The circuit is suitable for 60 GHz FMCW radar applications requiring a continuously tunable ultra-wide modulation bandwidth. The LC-tank inductor is used to couple the two VCO cores. The fundamental frequency of the VCO can be tuned from 26 GHz to 33,5 GHz, which corresponds to a frequency tuning range (FTR) of 25%. The second harmonic is extracted in a non-invasive way using a transformer. The primary side acts simultaneously as a second harmonic filter. The VCO achieves in measurement a low phase noise of 91,8 dBc=Hz at 1 MHz offset at 62 GHz and an output power of 20 dBm. The VCO including buffers dissipates in the dual-core operation mode 60 mA from a single 1,1 V supply and consumes a chip area of 0,58 mm2.}, author = {Issakov, Vadim and Rimmelspacher, Johannes and Trotta, Saverio and Tiebout, Marc and Hagelauer, Amelie and Weigel, Robert}, language = {English}, booktitle = {European Microwave Week 2017}, cris = {https://cris.fau.de/converis/publicweb/publication/1071962}, year = {2017}, month = {10}, day = {08}, eventdate = {2017-10-08/2017-10-13}, eventtitle = {European Microwave Week 2017}, faupublication = {yes}, keywords = {millimeter-wave,ultra-wideband,CMOS technology}, note = {unpublished}, peerreviewed = {Yes}, title = {A 52-to-67 GHz Dual-Core Push-Push VCO in 40-nm CMOS}, type = {Journal Article}, venue = {Nuremberg Convention Center, Nuremberg, Germany}, }

  • F. Lurz, S. Müller, S. Lindner, S. Linz, M. Gardill, R. Weigel, and A. Koelpin, "Smart Communication and Relative Localization System for Firefighters and Rescuers" in IEEE International Microwave Symposium, Honolulu, Hawaii, 2017 (to be published). [Bibtex]
    @inproceedings{lurz2017a,
    author = {Lurz, Fabian and Müller, Simon and Lindner, Stefan and Linz, Sarah and Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060854},
    year = {2017},
    month = {06},
    day = {04},
    eventdate = {2017-06-04/2017-06-09},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {Smart Communication and Relative Localization System for Firefighters and Rescuers},
    venue = {Honolulu, Hawaii},
    }
  • A. Koelpin, R. Weigel, and A. Talai, "Efficient Radar Front-end Implementation in LTCC Multilayer Cavity Technology" in Workshop on Recent Progresses in mmW Multilayer Circuit and System Design and Packaging (MCM/SoP), Honolulu, HI, USA, 2017. [Bibtex]
    @inproceedings{koelpin2017a,
    author = {Koelpin, Alexander and Weigel, Robert and Talai, Armin},
    editor = {IEEE},
    language = {English},
    booktitle = {Workshop on Recent Progresses in mmW Multilayer Circuit and System Design and Packaging (MCM/SoP)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1064744},
    year = {2017},
    month = {06},
    day = {09},
    eventdate = {2017-06-04/2017-06-09},
    eventtitle = {Imternational Microwave Symposium},
    faupublication = {yes},
    keywords = {LTCC; Radar},
    peerreviewed = {Yes},
    title = {Efficient Radar Front-end Implementation in LTCC Multilayer Cavity Technology},
    type = {Konferenzschrift},
    venue = {Honolulu, HI, USA},
    }
  • [DOI] 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, Phoenix, AZ, USA, 2017, pp. 144-146. [Bibtex]
    @inproceedings{haberl2017,
    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.},
    author = {Haberl, Matthias and Sanftl, Benedikt and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE MTT-S},
    booktitle = {IEEE Radio and Wireless Symposium 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060646},
    year = {2017},
    month = {06},
    day = {07},
    doi = {10.1109/RWS.2017.7885970},
    eventtitle = {IEEE Radio and Wireless Symposium 2017},
    faupublication = {yes},
    keywords = {ADC; I/Q signal processing; nonuniform sampling; subsampling},
    pages = {144--146},
    peerreviewed = {Yes},
    title = {A Direct RF-to-Baseband Quadrature Subsampling Receiver Using a Low Cost ADC},
    venue = {Phoenix, AZ, USA},
    }
  • [DOI] T. Fersch, R. Weigel, and A. Koelpin, "A CDMA Modulation Technique for Automotive Time-of-Flight LiDAR Systems", IEEE Sensors Journal, vol. 17, iss. 11, pp. 3507-3516, 2017. [Bibtex]
    @article{fersch2017,
    abstract = {We present the application of optical code division multiple access (OCDMA) modulation based on optical orthogonal codes for automotive time-of-flight light detection and ranging (LiDAR) system sensors using avalanche photodiode (APD) detectors. The modulation opens the possibility to discriminate single laser transmissions. This allows the realization of additional features like enhancing the systems’ interference robustness or accelerating their scanning rate. The requirements on automotive LiDAR OCDMA modulation differs from telecommunication’s demands in several ways: The sensor must guarantee absolute laser safety; front facing devices must be able to provide reliable long range results up to a distance of 150m and beyond; and the signal is transmitted through free space. After outlining the basic functionality of the sort of sensors in consideration, the properties of the optical orthogonal codes (OOC) modulation are compared with the state of the art theoretically. The influence of OOC parameters with respect to scanning LiDAR systems is examined. The modulation technique is then demonstrated experimentally with two examples: The detection and separation of coded and traditional signals is shown using a matched filter detection algorithm. In the same way, differently coded signals can be separated from each other. Impediments of the interference suppression quality are discussed. Finally, an overview of possible applications of the proposed technique in automotive LiDAR systems is given, which are enabled by the OCDMA modulation in the first place.},
    author = {Fersch, Thomas and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Intelligent Transportation Systems Transactions},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060643},
    year = {2017},
    month = {06},
    day = {01},
    doi = {10.1109/JSEN.2017.2688126},
    faupublication = {yes},
    issn = {1530-437X},
    journaltitle = {IEEE Sensors Journal},
    keywords = {LiDAR; CDMA},
    number = {11},
    pages = {3507--3516},
    peerreviewed = {Yes},
    shortjournal = {IEEE SENS J},
    title = {A CDMA Modulation Technique for Automotive Time-of-Flight LiDAR Systems},
    volume = {17},
    }
  • C. Söll, M. Reichenbach, J. Röber, A. Hagelauer, R. Weigel, and D. Fey, "Case Study on Memristor-Based Multilevel Memories", International Journal of Circuit Theory and Applications, 2017 (to be published). [Bibtex]
    @article{soell2017,
    abstract = {In this work, the benefits of memristor-based multilevel memories are described along with their design problems. Starting with measurements of discrete actual devices, a discrete memristor based multilevel memory is developed. It uses a printed circuit board in order to connect eight packaged memristors from Bio Inspired to test a ternary Arithmetic Logic Unit (ALU) on a field programmable gate array (FPGA). These circuits are then integrated in the second proposed memory system based on a 150nm CMOS process that can be equipped with memristors on top of the metal layers. This integrated solution includes proper read-out, erase and write circuits to control real memristors, and 32x32 memristive memory cells. It is compared to a common static random-access memory (SRAM) in terms of area, computation speed and power consumption showing benefits for memory sizes bigger than 70 words. Since yield and device variations are still a big issue in memristor fabrication, methods to counter these problems are also proposed in the end. An actual implementation should offer several trimming solutions to ensure proper functionality of a prototype memory as well as a power-on calibration, until these problems are solved. The development of the presented memories is not only based on different models but also measurements done with real devices.},
    author = {Söll, Christopher and Reichenbach, Marc and Röber, Jürgen and Hagelauer, Amelie and Weigel, Robert and Fey, Dietmar},
    publisher = {Wiley Online Library},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060638},
    year = {2017},
    month = {06},
    faupublication = {yes},
    journaltitle = {International Journal of Circuit Theory and Applications},
    keywords = {Memristor; Multi-Level Memory; Memory Interface; Memristive Computing; GRK-1773},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {Case Study on Memristor-Based Multilevel Memories},
    }
  • F. Trenz, R. Weigel, and D. Kissinger, "Validation of a Functional Principle for a Broadband Millimeter-Wave Power Detection Structure in a Recent BiCMOS Technology" in IEEE Radio Frequency Integrated Circuits Symposium, Honolulu, Hawaii, USA, 2017. [Bibtex]
    @inproceedings{trenz2017,
    abstract = {In this paper, a functional principle for a broadband thermal detector suited for a monolithical integration is shown. Two tantalum load resistors are heated by an input signal, while the temperature at a fixed distance is recorded on chip with a differential temperature sensing bridge. An integrated differential to single-ended stage amplifies the bridges differential voltage and makes an output voltage proportional to the input power of the detector available. The thermal resistance and capacitance between the load resistor and the sensing cell act as a low pass filter in the electrical regime. Based on this concept, a detector chip has been designed, which has been analyzed in thermal simulations. The realized detector has been characterized on-chip and bonded to a microwave substrate for a system performance estimation. Its input impedance is tuned to 50 Ohms and measured matching is better than -15dB from 10MHz to 43.5GHz. With a low supply voltage of 1.5V and its active area of around 80x36um2, the detector is suitable for an integrated power measurement solution.},
    author = {Trenz, Florian and Weigel, Robert and Kissinger, Dietmar},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE Radio Frequency Integrated Circuits Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058073},
    year = {2017},
    month = {06},
    day = {04},
    eventdate = {2017-06-04/2017-06-06},
    faupublication = {yes},
    keywords = {Detectors;Envelope detectors;Monolithic integrated circuits;BiCMOS integrated circuits;Thermodynamics},
    peerreviewed = {Yes},
    title = {Validation of a Functional Principle for a Broadband Millimeter-Wave Power Detection Structure in a Recent BiCMOS Technology},
    type = {Konferenzschrift},
    venue = {Honolulu, Hawaii, USA},
    }
  • [DOI] B. Sanftl, M. Trautmann, M. Kleinhenz, R. Weigel, and A. Koelpin, "Increased Data Rate using Higher-order Digital Modulation for Simultaneous Inductive Data and Power Transfer Systems" in IEEE MTT-S Wireless Power Transfer Conference 2017, Taipeh, Taiwan, 2017, pp. 1-3. [Bibtex]
    @inproceedings{sanftl2017,
    abstract = {This paper presents an improved communication architecture with increased data rate for inductive power transfer (IPT) systems. The main challenge is to enable robust and reliable communication within the noisy environment of the power transfer. Therefore the communication channel, consisting of the coupled pair of coils of the inductive power transfer system is analysed. From this a frequency band with an excellent available signal to noise ratio was identified and is exploited using higher-order digital modulation schemes as n-th quadrature amplitude modulation or phase shift keying to increase the data rate. Furthermore the bandwidth of the system shall be extended by the utilisation of an equalizer. The implemented system using a software defined radio approach will be presented and it will be shown that reliable and fast communication is possible in this harsh environment.},
    author = {Sanftl, Benedikt and Trautmann, Martin and Kleinhenz, Markus and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE MTT-S Wireless Power Transfer Conference 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061287},
    year = {2017},
    month = {06},
    day = {22},
    doi = {10.1109/WPT.2017.7953843},
    eventtitle = {2017 IEEE Wireless Power Transfer Conference (WPTC)},
    faupublication = {yes},
    keywords = {Inductive power transfer,inductive data communication,power filters,wireless communication,industrial electronics,digital modulation},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Increased Data Rate using Higher-order Digital Modulation for Simultaneous Inductive Data and Power Transfer Systems},
    type = {Konferenzschrift},
    venue = {Taipeh, Taiwan},
    }
  • V. Issakov, J. Rimmelspacher, A. Werthof, A. Hagelauer, and R. Weigel, "Experimental Study on Substrate Coupling in Bulk Silicon and RF-SOI CMOS up to 110 GHz" in IEEE MTT-S International Microwave Symposium 2017, Hawaii Convention Center, Honolulu, Hawaii, USA, USA, 2017 (to be published). [Bibtex]
    @inproceedings{issakov2017,
    abstract = {Interferences injected to an RF circuit may strongly deteriorate the electrical performance. Parasitic coupling via substrate is one of the dominant interference transmission mechanisms in highly integrated systems. The effect of substrate coupling becomes more critical at higher circuit frequencies. This poses a particular challenge for highly integrated millimeterwave systems, since isolation techniques become less efficient with an increasing operating frequency. This paper presents an experimental study on coupling via bulk silicon and RFSOI substrates. We investigate in measurement up to 110 GHz efficiency of several isolation techniques, such as triple-well, p+ and n+ guard-rings and use of undoped highly resistive region. Additionally, RF-SOI substrates are known to be beneficial for higher crosstalk isolation. However, also this isolation degrades at higher frequencies. Hence, we investigate in measurement up to 110 GHz the isolation via low-resistivity and high-resistivity trap-rich SOI substrate variants. Test structures were realized in 40 nm bulk CMOS and 45 nm RF-SOI technology nodes.},
    author = {Issakov, Vadim and Rimmelspacher, Johannes and Werthof, Andreas and Hagelauer, Amelie and Weigel, Robert},
    language = {English},
    booktitle = {IEEE MTT-S International Microwave Symposium 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1071923},
    year = {2017},
    month = {06},
    day = {04},
    eventdate = {2017-06-04/2017-06-09},
    eventtitle = {International Microwave Symposium 2017},
    faupublication = {yes},
    keywords = {millimeter-wave,Substrate-coupling effects,CMOS,Silicon-on-Insulator.},
    note = {unpublished},
    peerreviewed = {unknown},
    title = {Experimental Study on Substrate Coupling in Bulk Silicon and RF-SOI CMOS up to 110 GHz},
    type = {Journal Article},
    venue = {Hawaii Convention Center, Honolulu, Hawaii, USA, USA},
    }
  • J. Rimmelspacher, R. Weigel, A. Hagelauer, and V. Issakov, "36 % Frequency-Tuning-Range Dual-Core 60 GHz Push-Push VCO in 45 nm RF-SOI CMOS Technology" in IEEE MTT-S International Microwave Symposium 2017, Hawaii Convention Center, Honolulu, Hawaii, USA, USA, 2017, p. 3 (to be published). [Bibtex]
    @inproceedings{rimmelspacher2017,
    abstract = {This paper presents a millimeter-wave (mm-wave) push-push voltage-controlled oscillator (VCO) in a 45 nm RFSOI CMOS technology. The circuit aims to meet specifications for FMCW radar applications requiring an ultra-wide PLL modulation bandwidth. The fundamental output of the VCO can be tuned from 27 GHz to 39 GHz, which corresponds to frequency tuning range (FTR) of 36 %. We extract the 2nd harmonic in a non-invasive way using a transformer. The measured phase noise (PN) at 1 MHz offset from the fundamental carrier varies across the tuning range from -100 dBc/Hz to -90 dBc/Hz. The VCO including output buffers dissipates 65 mW DC power from a single 1 V supply and consumes a chip area of 0.12 mm2.},
    author = {Rimmelspacher, Johannes and Weigel, Robert and Hagelauer, Amelie and Issakov, Vadim},
    language = {English},
    booktitle = {IEEE MTT-S International Microwave Symposium 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1071916},
    year = {2017},
    month = {06},
    day = {04},
    eventdate = {2017-06-04/2017-06-09},
    eventtitle = {International Microwave Symposium 2017},
    faupublication = {yes},
    keywords = {millimeter-wave,ultra-wideband,CMOS technology,cutoff frequency,System-on-Chip,Silicon-on-Insulator},
    note = {unpublished},
    pages = {3},
    peerreviewed = {unknown},
    title = {36 % Frequency-Tuning-Range Dual-Core 60 GHz Push-Push VCO in 45 nm RF-SOI CMOS Technology},
    type = {Journal Article},
    venue = {Hawaii Convention Center, Honolulu, Hawaii, USA, USA},
    }
  • M. Völkel, M. Dietz, A. Hagelauer, R. Weigel, and D. Kissinger, "A 60-GHz Low-Noise Variable-Gain Amplifier in a 130-nm BiCMOS Technology for Sixport Applications" in ISCAS, Baltimore, 2017. [Bibtex]
    @inproceedings{voelkel2017,
    abstract = {Abstract—A monolithic low noise variable gain amplifier (LNA)
    operating at 60 GHz is presented. It is designed for a sixport
    receiver, which is completely integrated on a single chip. These
    chips are build in highly miniaturized sensors to measure
    distances with radar. Therefore a high performance LNA is
    indispensable. The circuit has been designed using a new 0.13 m
    SiGe BiCMOS process from IHP (SG13G2). For implementation
    a three stage architecture is chosen. Measurements show a
    tuneable gain from 16 to 24 dB at 60 GHz, an input matching of
    -17 dB and an output matching of -14 dB. The circuit consumes
    13mA from a 3.3V supply.}, author = {Völkel, Matthias and Dietz, Marco and Hagelauer, Amelie and Weigel, Robert and Kissinger, Dietmar}, language = {English}, booktitle = {ISCAS}, cris = {https://cris.fau.de/converis/publicweb/publication/1063453}, year = {2017}, month = {05}, day = {29}, eventdate = {2017-05-28/2017-05-31}, faupublication = {yes}, peerreviewed = {unknown}, title = {A 60-GHz Low-Noise Variable-Gain Amplifier in a 130-nm BiCMOS Technology for Sixport Applications}, type = {Konferenzschrift}, venue = {Baltimore}, }
  • [DOI] C. Schmidt, M. Luebcke, M. Dietz, R. Weigel, D. Kissinger, and A. Hagelauer, "Determination of Changes in NaCl Concentration in Aqueous Solutions Using an M-Sequence Based Sensor System" in First IEEE MTT-S International Microwave Bio-Conference, Göteborg, Sweden, 2017. [Bibtex]
    @inproceedings{schmidt2017a,
    author = {Schmidt, Christian and Luebcke, Maximilian and Dietz, Marco and Weigel, Robert and Kissinger, Dietmar and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {First IEEE MTT-S International Microwave Bio-Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061393},
    year = {2017},
    month = {05},
    day = {15},
    doi = {10.1109/IMBIOC.2017.7965786},
    eventdate = {2017-05-15/2017-05-17},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Determination of Changes in NaCl Concentration in Aqueous Solutions Using an M-Sequence Based Sensor System},
    type = {Konferenzschrift},
    venue = {Göteborg, Sweden},
    }
  • [DOI] C. Will, K. Shi, R. Weigel, and A. Koelpin, "Advanced Template Matching Algorithm for Instantaneous Heartbeat Detection using Continuous Wave Radar Systems" in IEEE MTT-S International Microwave Bio Conference (IMBioC), Göteborg, Sweden, 2017. [Bibtex]
    @inproceedings{will2017a,
    abstract = {Instantaneous heartbeat detection is a key parameter in modern vital sign monitoring. Continuous wave (CW) radar systems enable contactless measurements of the vibrations on the human skin effected by heartbeats. Since a high accuracy as well as robustness of the measurement sensor is appreciated, the belonging signal processing routine has to deal with challenging requirements. In this paper, an advanced template matching (ATM) algorithm is proposed to enhance the performance regarding instantaneous heartbeat detection using CW radar systems. Compared to common template matching algorithms, multiple heterogeneous templates are utilized in this approach, at which the appropriate template type is determined by prior feature detection. A 24 Ghz Six-Port microwave interferometer is used for vital sign measurements of a person-under-test. The functionality of the proposed algorithm is verified by a synchronous reference electrocardiogram (ECG) and its enhancement is shown by reducing the root-mean-square error (RMSE) of the interbeat intervals (IBI) compared to an ordinary template matching algorithm.},
    author = {Will, Christoph and Shi, Kilin and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Microwave Bio Conference (IMBioC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061648},
    year = {2017},
    month = {05},
    day = {15},
    doi = {10.1109/IMBIOC.2017.7965797},
    eventdate = {2017-05-15/2017-05-17},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Advanced Template Matching Algorithm for Instantaneous Heartbeat Detection using Continuous Wave Radar Systems},
    type = {Konferenzschrift},
    venue = {Göteborg, Sweden},
    }
  • M. Trautmann, M. Ohlendorf, B. Sanftl, R. Weigel, and A. Koelpin, "Dimensioning and Comparison of Common Compensation Topologies for IPT Systems" in 2017 IEEE International Symposium on Circuits and Systems (ISCAS), Baltimore, Maryland, 2017 (to be published). [Bibtex]
    @inproceedings{trautmann2017a,
    abstract = {This paper presents the dimensioning as well as the comparison of common compensation topologies for inductive power transfer (IPT) systems. A compensation is needed on the primary as well as the secondary side. It consists of a capacitor (parallel or series) in the simplest case or a combination of reactive components (like LCC). This work is the first compilation of the dimensioning, considering all potential combinations of these three compensation possibilities. The five most promising solutions are simulated and the results are compared for constant current- and voltage-operation with varying loads as well as different coupling factors. Finally the different topologies are compared by selected criteria and evaluated accordingly.},
    author = {Trautmann, Martin and Ohlendorf, Marius and Sanftl, Benedikt and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE CAS},
    booktitle = {2017 IEEE International Symposium on Circuits and Systems (ISCAS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060645},
    year = {2017},
    month = {05},
    eventtitle = {IEEE International Symposium on Circuits and Systems (ISCAS)},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {Dimensioning and Comparison of Common Compensation Topologies for IPT Systems},
    venue = {Baltimore, Maryland},
    }
  • [DOI] V. Chauhan, M. Mayer, C. Huck, M. Pitschi, R. Weigel, and A. Hagelauer, "Nonlinear behavior of RF Bulk Acoustic Wave cascaded components at high input power" in Nonlinear behavior of RF Bulk Acoustic Wave cascaded components at high input power, New Delhi, India, India, 2017, p. 4. [Bibtex]
    @inproceedings{chauhan2016a,
    abstract = {At high frequency, Bulk Acoustic Wave (BAW) devices are mainly used for filtering in front-ends of modern mobile transceivers. Furthermore, the transmitter filters are usually used at high input power levels of up to 33 dBm, which lead to nonlinearity and self-heating within the filter. In this work a thermo-electro-mechanical Mason model combined with a 3-dimensional electromagnetic finite element method (3D EM FEM) is used for modeling the nonlinear behavior of different BAW components. The impedance curve, filter response, second harmonics as well as inter-modulation distortion (IMD) of cascaded BAW resonators and filters due to the nonlinearities are explained. With the aid of the developed method, different cascading approaches for optimizing the nonlinear behavior are shown. Measurements of BAW components up to second order harmonics have been carried out using a nonlinear vector network analyzer (NVNA).},
    author = {Chauhan, Vikrant and Mayer, Markus and Huck, Christian and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    language = {English},
    publisher = {IEEE},
    booktitle = {Nonlinear behavior of RF Bulk Acoustic Wave cascaded components at high input power},
    cris = {https://cris.fau.de/converis/publicweb/publication/1066804},
    year = {2017},
    month = {05},
    day = {18},
    doi = {10.1109/APMC.2016.7931351},
    eventdate = {2016-12-05/2016-12-09},
    eventtitle = {2016 Asia-Pacific Microwave Conference (APMC)},
    faupublication = {yes},
    issn = {2165-4743},
    keywords = {Resonators;Harmonic analysis;Power harmonic filters;Power measurement;Frequency measurement;Area measurement;Bulk acoustic wave devices},
    pages = {4},
    peerreviewed = {Yes},
    title = {Nonlinear behavior of RF Bulk Acoustic Wave cascaded components at high input power},
    type = {Konferenzschrift},
    venue = {New Delhi, India, India},
    }
  • [DOI] L. Zimmermann, A. Götz, G. Fischer, and R. Weigel, "Performance Analysis of Time Difference of Arrival and Angle of Arrival Estimation Methods for GSM Mobile Phone Localization," in Communication, Signal Processing & Information Technology, De Gruyter, 2017, vol. 4, pp. 17-34. [Bibtex]
    @inbook{zimmermann2017,
    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.},
    author = {Zimmermann, Lars and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    language = {English},
    publisher = {De Gruyter},
    booktitle = {Communication, Signal Processing & Information Technology},
    cris = {https://cris.fau.de/converis/publicweb/publication/1063135},
    year = {2017},
    month = {04},
    doi = {10.1515/9783110448399-002},
    faupublication = {yes},
    isbn = {9783110448399},
    issn = {2365-7493},
    journaltitle = {Advances in systems, signals and devices},
    keywords = {Time difference of arrival estimation; Direction of arrival estimation; GSM; Maximum likelihood estimation; Multiple signal classification; Estimation of signal parameters via rotational invariance techniques},
    pages = {17--34},
    peerreviewed = {unknown},
    series = {Advances in Systems, Signals and Devices},
    title = {Performance Analysis of Time Difference of Arrival and Angle of Arrival Estimation Methods for GSM Mobile Phone Localization},
    type = {Buchkapitel},
    volume = {4},
    }
  • [DOI] M. Hierold, R. Weigel, and A. Koelpin, "Assessment of Transmitter Initiated Wake-Up Radio Versus Pure Wake-Up Receiver Decoding", IEEE Microwave and Wireless Components Letters, vol. 27, iss. 4, pp. 413-415, 2017. [Bibtex]
    @article{hierold2017,
    abstract = {Energy efficient data transmission is a crucial task in wireless sensor networks. Wake-up radio (WuR) communication offers big potential here, rendering pure asynchronous communication possible. Two different approaches of WuR communication are presented here and a dedicated hardware implementation is proposed. By assessing the performance concerning energy efficiency for both approaches, their impact on the number of payload data bits and the number of nodes in communication range is revealed. A decision guidance is provided based on the parameters of a specific application scenario.},
    author = {Hierold, Martin and Weigel, Robert and Koelpin, Alexander},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060298},
    year = {2017},
    month = {04},
    doi = {10.1109/LMWC.2017.2678446},
    faupublication = {yes},
    issn = {1531-1309},
    journaltitle = {IEEE Microwave and Wireless Components Letters},
    number = {4},
    pages = {413--415},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW WIREL CO},
    title = {Assessment of Transmitter Initiated Wake-Up Radio Versus Pure Wake-Up Receiver Decoding},
    volume = {27},
    }
  • [DOI] 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), Paris, France, 2017, pp. 2400-2404. [Bibtex]
    @inproceedings{frank2017,
    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.},
    author = {Frank, Martin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {European Conference on Antennas and Propagation (EuCAP)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060640},
    year = {2017},
    month = {03},
    day = {19},
    doi = {10.23919/EUCAP.2017.7928298},
    eventdate = {2017-03-16/2017-03-24},
    faupublication = {yes},
    pages = {2400--2404},
    peerreviewed = {Yes},
    title = {Design of a 24 GHz Reconfigurable Transmitarray Element with Continuous Phase Range},
    type = {Konferenzschrift},
    venue = {Paris, France},
    }
  • [DOI] P. Gröschel, S. Zarei, C. Carlowitz, M. Lipka, E. Sippel, A. Ali, R. Weigel, R. Schober, and M. Vossiek, "A System Concept for Online Calibration of Massive MIMO Transceiver Arrays for Communication and Localization", IEEE Transactions on Microwave Theory and Techniques, 2017. [Bibtex]
    @article{groeschel2017,
    abstract = {Massive multiple-input multiple-output (MIMO) techniques are being considered for the fifth generation (5G) mobile communication systems in order to deliver high multiplexing gain. However, hardware impairments like quadrature imbalance in mixers violate the requirement for channel reciprocity and may change, e.g., with temperature or while aging. In addition, advanced wireless localization techniques and the generation of predefined beam patterns require knowledge about all antenna phase center positions and the time and phase delay of all transmit and receive channels. Thus, an efficient online compensation method is needed that scales well for very large numbers of transceiver modules. We propose to extend the transmitter with a small measurement feature at the transmitter output based on one uncalibrated power detector per module as well as a single, external four-element backscatter array for the entire matrix. These enhancements facilitate a fast and efficient iterative calibration, which recognizes and mitigates all major error sources. Beside optimal communication throughput and energy efficiency, it thereby brings localization capabilities to mobile networks as an additional major benefit. For verification, a system of multiple cost-efficient 5.8-GHz massive MIMO transceivers with 150-MHz bandwidth and a backscatter array has been implemented. Measurement results demonstrate the capability of the proposed concept to efficiently compensate major error sources as well as its robustness.},
    author = {Gröschel, Patrick and Zarei, Shahram and Carlowitz, Christian and Lipka, Melanie and Sippel, Erik and Ali, Arslan and Weigel, Robert and Schober, Robert and Vossiek, Martin},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060652},
    year = {2017},
    month = {03},
    day = {01},
    doi = {10.1109/TMTT.2017.2663404},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {Backscatter transponder (BT),calibration,fifth generation (5G) mobile communication,massive multiple-input multiple-output (MIMO),wireless localization},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A System Concept for Online Calibration of Massive MIMO Transceiver Arrays for Communication and Localization},
    type = {online publication},
    url = {http://ieeexplore.ieee.org/document/7867061/},
    }
  • S. Fuchs and R. Weigel, "Octal-site Testing of a State-of-the-art LTE RF-Transceiver IC" in Tagungsband TuZ 2017, Park Inn Hotel, Lübeck, 2017, pp. 29-32. [Bibtex]
    @inproceedings{fuchs2017,
    abstract = {More and more complex RF-transceiver ICs demand a broad test coverage to ensure highest outgoing quality. At the same time test costs need to be reduced due to low margins in the transceiver chip business. To make more efficient usage of expensive ATE (Automated Test Environment), higher parallelism is mandatory. Quad-site testing for RF-transceiver ICs is well established in the Semiconductor-Industry. Most ATE-vendors have optimized their machines for quad-site application. Due to higher usage of built-in self-test (BIST) functionality, higher parallelism seems feasible and reasonable in economic considerations. Nevertheless for higher multi-site testing the software as well as the hardware design constraints need to be considered carefully. This paper describes the extension for Octal-site testing and the respective signal integrity constraints.},
    author = {Fuchs, Stephan and Weigel, Robert},
    editor = {Mentor Graphics, Universität Bremen},
    language = {English},
    booktitle = {Tagungsband TuZ 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1063399},
    year = {2017},
    month = {03},
    day = {05},
    eventdate = {2017-03-05/2017-03-07},
    eventtitle = {29th GI/GMM/ITG-Workshop Testmethoden und Zuverlässigkeit von Schaltungen und Systemen},
    faupublication = {yes},
    keywords = {Octal-site testing; LTE-transceiver; site-interference; signal integrity; multi-site efficiency},
    pages = {29--32},
    peerreviewed = {Yes},
    title = {Octal-site Testing of a State-of-the-art LTE RF-Transceiver IC},
    type = {Konferenzschrift},
    venue = {Park Inn Hotel, Lübeck},
    }
  • [DOI] F. Xie, R. Weiß, and R. Weigel, "Improved Mathematical Operations Based Calibration Method for Giant Magnetoresistive Current Sensor Applying B-Spline Modeling", Sensors and Actuators A-Physical, vol. 254, pp. 109-115, 2017. [Bibtex]
    @article{xie2016a,
    abstract = {Nowadays, giant magnetoresistance (GMR) based sensor technology is widely used in numerous industrial applications. However, an inexpensive and efficient method for compensating the nonlinearity of GMR spin valve sensor is still under the industrial expectation, which limits the applications of the GMR sensors. By applying the B-Spline modeling, excellent results were achieved; nevertheless, a calibration with several hundreds of measured data points over dozens of temperatures had to be conducted. In this paper an improved mathematical operations based calibration method for GMR spin valve type current sensors applying B-Spline modeling is introduced. This method allows a calibration for each further sensor applying B-Spline modeling with only two temperatures and per temperature only five measurement points. In comparison with the original calibration effort for B-Spline modeling, the new calibration method with minimized efforts showed an outstanding measurement accuracy of ±0.6% at a nominal current of 50~A in a temperature range from -20~°C to 80~°C. Due to the unexpected linear temperature behavior of the magnetic parameters, mainly of the uniaxial anisotropy to the exchange direction anisotropy ratio (Ku/Ked), only 5 measurement points at two different temperatures were necessary for our new calibration method.},
    author = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060282},
    year = {2017},
    month = {02},
    day = {01},
    doi = {10.1016/J.SNA.2016.11.034},
    faupublication = {yes},
    issn = {0924-4247},
    journaltitle = {Sensors and Actuators A-Physical},
    keywords = {Giant magnetoresistive (GMR); Current sensor; Current measurement; Sensor calibration; B -Spline modeling},
    pages = {109--115},
    peerreviewed = {Yes},
    shortjournal = {SENSOR ACTUAT A-PHYS},
    title = {Improved Mathematical Operations Based Calibration Method for Giant Magnetoresistive Current Sensor Applying B-Spline Modeling},
    volume = {254},
    }
  • [DOI] R. Weiss, R. Makuch, A. Itzke, and R. Weigel, "Crosstalk in Circular Arrays of Magnetic Sensors for Current Measurement", IEEE Transactions on Industrial Electronics, 2017. [Bibtex]
    @article{itzke2016,
    author = {Weiss, Roland and Makuch, Rory and Itzke, Alexander and Weigel, Robert},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060680},
    year = {2017},
    month = {02},
    day = {24},
    doi = {10.1109/TIE.2017.2674630},
    faupublication = {yes},
    issn = {0278-0046},
    journaltitle = {IEEE Transactions on Industrial Electronics},
    peerreviewed = {Yes},
    shortjournal = {IEEE T IND ELECTRON},
    title = {Crosstalk in Circular Arrays of Magnetic Sensors for Current Measurement},
    }
  • [DOI] 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 Conference on Wireless Sensors and Sensor Networks (WiSNet), Phoenix, Arizona, USA, 2017. [Bibtex]
    @inproceedings{will2017,
    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.},
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060634},
    year = {2017},
    month = {01},
    day = {15},
    doi = {10.1109/WISNET.2017.7878746},
    eventdate = {2017-01-15/2017-01-18},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Segmental Polynomial Approximation based Phase Error Correction for Precise Near Field Displacement Measurements using Six-Port Microwave Interferometers},
    type = {Konferenzschrift},
    venue = {Phoenix, Arizona, USA},
    }
  • [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, vol. 66, iss. 5, pp. 974-984, 2017. [Bibtex]
    @article{lurz2017,
    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.},
    author = {Lurz, Fabian and Lindner, Stefan and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060635},
    year = {2017},
    month = {01},
    day = {19},
    doi = {10.1109/TIM.2016.2642618},
    faupublication = {yes},
    issn = {0018-9456},
    journaltitle = {IEEE Transactions on Instrumentation and Measurement},
    number = {5},
    pages = {974--984},
    peerreviewed = {Yes},
    shortjournal = {IEEE T INSTRUM MEAS},
    title = {High-Speed Resonant Surface Acoustic Wave Instrumentation Based on Instantaneous Frequency Measurement},
    volume = {66},
    }
  • [DOI] 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. 207-210. [Bibtex]
    @inproceedings{kloc2017,
    author = {Kloc, Matej and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060636},
    year = {2017},
    month = {01},
    doi = {10.1109/RWS.2017.7885989},
    eventtitle = {IEEE Radio and Wireless Symposium (RWS)},
    faupublication = {yes},
    pages = {207--210},
    peerreviewed = {No},
    title = {SDR Implementation of an Adaptive Low-Latency IEEE 802.11p Transmitter System for Real-Time Wireless Applications},
    }
  • [DOI] S. N. Easwaran, S. Chellamuthu, S. K. Venugopal, and R. Weigel, "Voltage and Current Selector Based Biasing Topology for Multiple Supply Voltage Circuits", IEEE Transactions on Circuits and Systems Ii-Express Briefs, 2017. [Bibtex]
    @article{easwaran2017,
    abstract = {In Systems on Chip (SOC) there are Multiple Supply Voltage designs where a module is powered by several supply rails. For example these rails are at 40V, 5V and 3.3V. A safe biasing scheme is needed to ensure no tri-stated biasing conditions can exist, which can result in unintended activation of the power stages or output drivers leading to high currents. It is shown here a safe biasing scheme can be implemented under any power sequencing scheme in Multiple Supply Voltage designs by exploiting the voltage and current selector topologies. This circuit was implemented in a 40V, 0.35µm, BiCMOS process on a 4 channel airbag squib driver IC. The fabricated circuit’s quiescent current is less than 5mA even if the on chip junction temperature is 175°C and for various fault conditions that can occur in a multiple power supply domain.},
    author = {Easwaran, Sri Navaneethakrishnan and Chellamuthu, Shanmuganad and Venugopal, Sunil Kashyap and Weigel, Robert},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060351},
    year = {2017},
    month = {01},
    day = {27},
    doi = {10.1109/TCSII.2017.2660525},
    faupublication = {yes},
    issn = {1549-7747},
    journaltitle = {IEEE Transactions on Circuits and Systems Ii-Express Briefs},
    keywords = {Rails; Logic gates; System-on-chip; Photonic band gap; Generators; State of charge; Digital audio players},
    peerreviewed = {Yes},
    shortjournal = {IEEE T CIRCUITS-II},
    title = {Voltage and Current Selector Based Biasing Topology for Multiple Supply Voltage Circuits},
    }
  • [DOI] S. Linz, C. Will, F. Lurz, S. Lindner, S. Mann, R. Schober, R. Weigel, and A. Koelpin, "Detector Nonlinearity in Six-Port Radar" in IEEE Topical Conference on Wireless Sensors and Sensor Networks, Phoenix, AZ, USA, 2017, pp. 19-22. [Bibtex]
    @inproceedings{linz2017,
    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.},
    author = {Linz, Sarah and Will, Christoph and Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Schober, Robert and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060641},
    year = {2017},
    month = {01},
    day = {15},
    doi = {10.1109/WISNET.2017.7878745},
    eventdate = {2017-01-15/2017-01-18},
    faupublication = {yes},
    pages = {19--22},
    peerreviewed = {Yes},
    title = {Detector Nonlinearity in Six-Port Radar},
    type = {Konferenzschrift},
    venue = {Phoenix, AZ, USA},
    }
  • [DOI] 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), Phoenix, AZ, USA, 2017. [Bibtex]
    @inproceedings{pflaum2017,
    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.},
    author = {Pflaum, Felix and Erhardt, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060637},
    year = {2017},
    month = {01},
    day = {15},
    doi = {10.1109/WISNET.2017.7878758},
    eventdate = {2017-01-15/2017-01-18},
    faupublication = {yes},
    keywords = {wireless; wsn; lda; statistics; localization},
    peerreviewed = {Yes},
    title = {RSSI-based Localization With Minimal Infrastructure Using Multivariate Statistic Techniques},
    venue = {Phoenix, AZ, USA},
    }
  • 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 and Wireless Week, Phoenix, 2017. [Bibtex]
    @inproceedings{schmidt2017,
    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.},
    author = {Schmidt, Christian and Nehring, Johannes and Dietz, Marco and Weigel, Robert and Kissinger, Dietmar and Hagelauer, Amelie},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060639},
    year = {2017},
    month = {01},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A 10 Gb/s Highly-Integrated Adaptive Pseudo-Noise Transmitter for Biomedical Applications},
    venue = {Phoenix},
    }
  • M. Frank, R. Weigel, and A. Koelpin, "A Multilayer Reconfigurable Transmitarray in K-Band for Beam Steering Applications" in International Conference on Electromagnetics in Advanced Applications (ICEAA 2017), Verona, 2017 (to be published). [Bibtex]
    @inproceedings{frank2017a,
    abstract = {There are many different radar applications which require a change in the direction of the radiation beam, for example in order to separate signals coming from different directions or to track targets. A change in the main beam direction is usually realized by a mechanical rotation of the antenna or electronically by using phased array systems.
    The work presented in this paper is focused on a less common approach to realize beam steering functionality, the so called transmitarray.
    The transmitarray is built of several unit cells and is placed in front of a focal source. Each unit cell includes two radiation structures to receive the signal coming from the source on one side and to retransmit it on the other side with a distinct phase shift. The superposition of the signal contributions of all array elements leads to a certain radiation pattern of the whole structure. By individually adjusting the phase shifts of each unit cell the desired radiation pattern can be realized.
    The realization of a transmitarray can be done in two steps. First the design of a unit cell which provides the capability of performing the phase shifts has to be done. Afterwards the array synthesis is done by combining several unit cells.
    The unit cell used in this approach is derived from previous research with significant improvements and is supposed to work in the 24 GHz ISM band. A continuous phase range is obtained by loading patches with varactor diodes on the outer layers of a layer stack consisting of two thin laminates of RO4350 and a metal sheet in between. Both, metal sheet and second metal layer of the laminate have apertures inside to provide coupling from one patch to the other. By applying a voltage difference between patch and ground plane the capacity of the varactor diode is changed. This detunes the whole structure and leads to a change in the transmission phase. To obtain the desired continuous phase range of 360° several unit cells are placed in series resulting in a multilayer structure.
    The functionality of the designed unit cell has been verified in simulation and measurement.
    In the next step a 5 x 1 array has been synthesized and designed for a +/- 30° beam steering range with CST MWS. Measurements of the radiation pattern for several combinations of the five tuning voltages have been performed with a measurement setup consisting of two horn antennas and a rotation stage.
    A +/- 30° beam steering range has been successfully confirmed.
    The designed transmitarray at 24 GHz differs from previous approaches by combining a continuous phase range of the unit cells with a working frequency in the K-band.}, author = {Frank, Martin and Weigel, Robert and Koelpin, Alexander}, booktitle = {International Conference on Electromagnetics in Advanced Applications (ICEAA 2017)}, cris = {https://cris.fau.de/converis/publicweb/publication/1063513}, year = {2017}, faupublication = {yes}, keywords = {Transmitarray; Reconfigurable Antenna; Beam Steering}, note = {unpublished}, peerreviewed = {automatic}, title = {A Multilayer Reconfigurable Transmitarray in K-Band for Beam Steering Applications}, venue = {Verona}, }
  • F. X. Röhrl, R. Sammer, J. Jakob, W. Bogner, R. Weigel, U. Hassel, and S. Zorn, "Cost-Effective SIW Band-Pass Filters for Millimeter Wave Applications - A method to combine low tolerances and low prices on standard pcb substrates" , Nürnberg, Germany, 2017 (to be published). [Bibtex]
    @inproceedings{roehrl2017,
    abstract = {The fabrication of passive RF structures in the
    millimeter wave frequency range with conventional printed
    circuit technology is subjected to some disadvantages (available
    design rules, dimensional accuracy and tolerances) compared to
    ceramic circuit carriers. The here presented SPE (sequential pre
    etching) process technology allows a significant reduction of these
    disadvantages, without diminishing the robustness of the PCB
    against environmental influences (IPC-A-600 class 3). The
    tolerance of the up to now dominating etching process is reduced
    from ±15 µm (at a copper height of 35 µm) to ±5 µm (at a copper
    height of 15 µm). For filters the new technology provides two
    benefits. Due to the lower copper thickness, the permitted design
    rules are significantly improved (line/space 50/50 µm at all layers
    – even at electroplated copper layers). Therefore structures with
    minimized dimensions can be realized. In addition the reduced
    etching tolerance allows fabricating filters with accurate and
    constant filter edges. In order to demonstrate the advantages, a
    high-slope SIW (substrate integrated waveguide) band-pass filter
    in the V-Band is presented. It is shown how the characteristic
    and tolerances of the filter are changed positively by the SPE
    technology.}, author = {Röhrl, Franz Xaver and Sammer, Roman and Jakob, Johannes and Bogner, Werner and Weigel, Robert and Hassel, Uwe and Zorn, Stefan}, language = {English}, cris = {https://cris.fau.de/converis/publicweb/publication/1063483}, year = {2017}, faupublication = {yes}, keywords = {band-pass filter (BPF); substrate integrated waveguide (SIW); low loss substrate; impedance controlled PCB; signal integrity; millimeter wave; sequential pre etching (SPE)}, note = {unpublished}, peerreviewed = {Yes}, title = {Cost-Effective SIW Band-Pass Filters for Millimeter Wave Applications - A method to combine low tolerances and low prices on standard pcb substrates}, venue = {Nürnberg, Germany}, }
  • C. Söll, J. Röber, H. Milosiu, R. Weigel, and A. Hagelauer, "Area-Efficient Fully Integrated Dual-Band Class-E/F Power Amplifier with Switchable Output Power for a BPSK/OOK Transmitter" in IEEE International Symposium on Circuits and Systems (ISCAS), Baltimore, 2017. [Bibtex]
    @inproceedings{soell2017a,
    abstract = {This paper presents a novel area-efficient dual-band class-E/F power amplifier (PA) with switchable output power. It is targeted to work in a BPSK/OOK transmitter in smart facility applications like an autarkic asset-tracking system based on small sensor nodes. The amplifier is able to operate at both 434MHz and 868MHz without the need for additional inductors. The output power settings at 868MHz are controllable between -1.79dBm and -24.61dBm at 4.96mA and 1.43mA current consumption, respectively. The whole circuit including all inductors and the matching network in front of the antenna consumes only 0.9mm2 chip area and is fully integrated in a 180nm CMOS process together with a VCO and a PLL.},
    author = {Söll, Christopher and Röber, Jürgen and Milosiu, Heinrich and Weigel, Robert and Hagelauer, Amelie},
    booktitle = {IEEE International Symposium on Circuits and Systems (ISCAS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060644},
    year = {2017},
    faupublication = {yes},
    keywords = {Class-E/F Power Amplifier; Dual-Band; Switchable Output Power; Asset-Tracking System},
    peerreviewed = {Yes},
    title = {Area-Efficient Fully Integrated Dual-Band Class-E/F Power Amplifier with Switchable Output Power for a BPSK/OOK Transmitter},
    venue = {Baltimore},
    }

2016

  • [DOI] 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, Singapur, 2016, pp. 1-4. [Bibtex]
    @inproceedings{girg2016a,
    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.},
    author = {Girg, Thomas and Schrüfer, Daniel and Dietz, Marco and Hagelauer, Amelie and Kissinger, Dietmar and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {International Symposium on Integrated Circuits},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060257},
    year = {2016},
    month = {12},
    day = {12},
    doi = {10.1109/ISICIR.2016.7829729},
    eventdate = {2016-12-12/2016-12-14},
    eventtitle = {The 15th International Symposium on Integrated Circuits},
    faupublication = {yes},
    keywords = {SiGe; BiCMOS; simultaneous phase and amplitude regenrative sampling; high data rate; communication; self-mixing},
    pages = {1--4},
    peerreviewed = {No},
    title = {Low Complexity 60-GHz Receiver Architecture for Simultaneous Phase and Amplitude Regenerative Sampling Systems},
    type = {Konferenzschrift},
    url = {http://ieeexplore.ieee.org/document/7829729/},
    venue = {Singapur},
    }
  • T. Lieske, D. Shuklin, D. Hohnloser, M. Reichenbach, B. Pfundt, D. Fey, and R. Weigel, "Smart Sensor Framework: A Pressure Sensor for Smart Home Applications" in 1. E|HOME-CENTER SYMPOSIUM, Nürnberg, Germany, 2016. [Bibtex]
    @inproceedings{lieske2016,
    author = {Lieske, Tobias and Shuklin, Denis and Hohnloser, Daniel and Reichenbach, Marc and Pfundt, Benjamin and Fey, Dietmar and Weigel, Robert},
    language = {English},
    booktitle = {1. E|HOME-CENTER SYMPOSIUM},
    cris = {https://cris.fau.de/converis/publicweb/publication/1064093},
    year = {2016},
    month = {12},
    day = {30},
    eventdate = {2016-11-30/2016-12-01},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Smart Sensor Framework: A Pressure Sensor for Smart Home Applications},
    type = {Konferenzschrift},
    venue = {Nürnberg, Germany},
    }
  • V. A. Silva Cortes, 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, Puerto Vallarta, Mexico, 2016. [Bibtex]
    @inproceedings{silva2016b,
    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.},
    author = {Silva Cortes, Victor Arturo and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    publisher = {IEEE MTT-S},
    booktitle = {Latin America Microwave Conference 2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060283},
    year = {2016},
    month = {12},
    day = {12},
    eventdate = {2016-12-12/2016-12-14},
    eventtitle = {Latin America Microwave Conference 2016},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {High Power Effects on a MEMS-based Tunable Matching Network for Power Amplifier Reconfigurability},
    venue = {Puerto Vallarta, Mexico},
    }
  • [DOI] 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), Auckland, New Zealand, 2016. [Bibtex]
    @inproceedings{trautmann2016b,
    author = {Trautmann, Martin and Sanftl, Benedikt and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE PES},
    booktitle = {IEEE Southern Power Electronics Conference (SPEC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060319},
    year = {2016},
    month = {12},
    doi = {10.1109/SPEC.2016.7846000},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Frequency Separation Stage Design for a Reliable Data Link in an IPT System for Electric Vehicles},
    venue = {Auckland, New Zealand},
    volume = {2},
    }
  • [DOI] 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 Advances in Wireless and Optical Communications (RTUWO), 2016, pp. 167-172. [Bibtex]
    @inproceedings{kloc2016c,
    author = {Kloc, Matej and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {Advances in Wireless and Optical Communications (RTUWO)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060266},
    year = {2016},
    month = {11},
    doi = {10.1109/RTUWO.2016.7821877},
    eventtitle = {Advances in Wireless and Optical Communications (RTUWO)},
    faupublication = {yes},
    pages = {167--172},
    peerreviewed = {Yes},
    title = {Enhancing the Real-Time Performance of a Wireless Hardware-in-the-Loop Test System in ISM Bands},
    type = {Konferenzschrift},
    }
  • [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},
    language = {English},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060258},
    year = {2016},
    month = {11},
    doi = {10.1109/TMTT.2016.2612664},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {11},
    pages = {3918--3926},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Test Method for Contactless On-wafer MEMS Characterization and Production Monitoring},
    volume = {64},
    }
  • 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. [Bibtex]
    @inproceedings{shuklin2016,
    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.},
    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},
    booktitle = {VDE Kongress 2016: Internet der Dinge},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060293},
    year = {2016},
    month = {11},
    eventtitle = {VDE Kongress 2016: Internet der Dinge},
    faupublication = {yes},
    keywords = {Smart Home; Intelligent Sensor System; MEMS Sensor; Analog to Digital Converter; Digital Processing Unit},
    peerreviewed = {Yes},
    title = {Systemkonzept eines autarken und intelligenten Miniatur-Sensors für Smart Home},
    }
  • 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, Mannheim, Germany, 2016, pp. 1-6. [Bibtex]
    @inproceedings{wibbing2016b,
    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.},
    author = {Wibbing, Sascha and Mann, Sebastian and Lurz, Fabian and Frank, Martin and Weigel, Robert and Koelpin, Alexander},
    language = {German},
    publisher = {VDE},
    booktitle = {VDE Kongress 2016: Internet der Dinge},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060244},
    year = {2016},
    month = {11},
    day = {07},
    eventdate = {2016-11-07/2016-11-08},
    faupublication = {yes},
    isbn = {9783800743087},
    pages = {1--6},
    peerreviewed = {Yes},
    title = {Radarbasierte und vernetzte Umfeldsensorik zur autonomen Steuerung von Industrierobotern},
    venue = {Mannheim, Germany},
    }
  • [DOI] 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, Kuta, Bali, Indonesia, 2016. [Bibtex]
    @inproceedings{sanftl2016c,
    author = {Sanftl, Benedikt and Magel, Thomas and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE ComSoc},
    booktitle = {ApMediaCast2016 Asia Pacific Conference on Multimedia and Broadcasting},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060305},
    year = {2016},
    month = {11},
    doi = {10.1109/APMEDIACAST.2016.7878179},
    eventtitle = {ApMediaCast2016 Asia Pacific Conference on Multimedia and Broadcasting},
    faupublication = {yes},
    keywords = {IPT; Inductive Data Communication; protocol design; wireless communication; signal processing},
    peerreviewed = {Yes},
    title = {A Robust Light-Weight Protocol Stack for Data Transmission within Inductive Power Transfer Systems},
    venue = {Kuta, Bali, Indonesia},
    }
  • [DOI] J. Nehring, M. Schütz, I. Nasr, K. Aufinger, R. Weigel, and D. Kissinger, "Highly Integrated 4-32-GHz Two-Port Vector Network Analyzers for Instrumentation and Biomedical Applications", IEEE Transactions on Microwave Theory and Techniques, pp. 1-16, 2016. [Bibtex]
    @article{nehring2016a,
    abstract = {This paper addresses the miniaturization of microwave vector network analyzers (VNAs) and the future vision of the VNA on a chip. Therefore, a highly integrated two-port VNA with a multioctave bandwidth from 4 to 32 GHz is presented. The proposed system is based on a fully integrated radio-frequency frontend consisting of a two-port stimulus, a four-channel heterodyne receiver, and a wideband testset. The testset is comprised of on-chip multisection directional couplers. The chip is operated inside a hardware demonstrator using a 16-term calibration procedure. The measurement of arbitrary devices under test is in excellent agreement with commercial measurement equipment and showed a mean deviation from the reference measurement of 0.17 dB and 1.29° regarding the forward transmission of a coaxial 30-dB attenuator. The system and receiver dynamic ranges are 44-77 and 82-101 dB at a resolution bandwidth of 100 kHz over the full system bandwidth. The measurements are highly repeatable and are robust against drift over time. As a proof of concept, the developed integrated network analyzers are utilized in a biomedical sensing scenario with an external and an on-chip sensor. Both approaches showed good sensitivity regarding the mixture ratio of binary solutions of ethanol and methanol.},
    author = {Nehring, Johannes and Schütz, Martin and Nasr, Ismail and Aufinger, K. and Weigel, Robert and Kissinger, D.},
    language = {English},
    publisher = {Institute of Electrical and Electronics Engineers (IEEE)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1055677},
    year = {2016},
    month = {11},
    doi = {10.1109/TMTT.2016.2616873},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    pages = {1--16},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Highly Integrated 4-32-GHz Two-Port Vector Network Analyzers for Instrumentation and Biomedical Applications},
    }
  • M. Dietz, G. A. Guarin Aristizabal, 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, Mannheim, 2016, pp. 1-6. [Bibtex]
    @inproceedings{dietz2016a,
    author = {Dietz, Marco and Guarin Aristizabal, Gustavo Adolfo 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},
    publisher = {VDE},
    booktitle = {VDE Kongress 2016: Internet der Dinge},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060315},
    year = {2016},
    month = {11},
    day = {07},
    eventdate = {2016-11-07/2016-11-08},
    faupublication = {yes},
    pages = {1--6},
    peerreviewed = {unknown},
    title = {Wearables with integrated Microwave-Sensors for Internet-of-Things-Applications (IoT) in the sector of health-care: An overview},
    venue = {Mannheim},
    }
  • 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, London, 2016, p. 4. [Bibtex]
    @inproceedings{senega2016,
    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.},
    author = {Senega, Simon and Röber, Jürgen and Nassar, Ali and Weigel, Robert and Heuer, Christian and Lindenmeier, Stefan},
    publisher = {IEEE},
    booktitle = {European Microwave Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060263},
    year = {2016},
    month = {10},
    eventtitle = {European Microwave Week},
    faupublication = {yes},
    pages = {4},
    peerreviewed = {Yes},
    title = {Compact Scan-Phase Antenna Diversity Related System Considerations},
    venue = {London},
    }
  • [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},
    publisher = {IEEE},
    booktitle = {Advanced Technologies for Communications (ATC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060265},
    year = {2016},
    month = {10},
    doi = {10.1109/ATC.2016.7764816},
    eventtitle = {Advanced Technologies for Communications (ATC)},
    faupublication = {yes},
    pages = {407--412},
    peerreviewed = {Yes},
    title = {Making Real-Time Hardware-in-the-Loop Testing of Automotive Electronic Control Units Wireless},
    }
  • C. Erhart, S. Lutz, T. Walter, H. Mantz, P. Hügler, and R. Weigel, "Design and demonstration of a full polarimetric sensor for surface texture characterisation" in European Microwave Conference, London, UK, 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},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060274},
    year = {2016},
    month = {10},
    day = {05},
    eventdate = {2016-10-05/2016-10-07},
    eventtitle = {13th European Radar Conference (EuRAD)},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Design and demonstration of a full polarimetric sensor for surface texture characterisation},
    url = {http://ieeexplore.ieee.org/document/7811680/},
    venue = {London, UK},
    }
  • [DOI] S. Lindner, R. Weigel, and A. Koelpin, "A Low-Cost Laser Barrier Based Vectorial Velocity Measurement System" in IEEE Sensors, Orlando, FL, USA, 2016, pp. 289-291. [Bibtex]
    @inproceedings{lindner2016,
    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.},
    author = {Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Sensors},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060310},
    year = {2016},
    month = {10},
    day = {30},
    doi = {10.1109/ICSENS.2016.7808494},
    eventdate = {2016-10-30/2016-11-02},
    faupublication = {yes},
    isbn = {9781479982875},
    keywords = {angle of arrival; velocity measurement; laser barrier; crossed laser; table soccer},
    pages = {289--291},
    peerreviewed = {No},
    title = {A Low-Cost Laser Barrier Based Vectorial Velocity Measurement System},
    venue = {Orlando, FL, USA},
    }
  • [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, Orlando, FL, USA, 2016, pp. 1-3. [Bibtex]
    @inproceedings{hohnloser2016,
    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.},
    author = {Hohnloser, Daniel and Shuklin, Denis and Schmidt, Carsten and Kreitmaier, Michael and Blasini, Mario and Hagelauer, Amelie and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Sensors},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060246},
    year = {2016},
    month = {10},
    day = {30},
    doi = {10.1109/ICSENS.2016.7808655},
    eventdate = {2016-10-30/2016-11-02},
    faupublication = {yes},
    keywords = {MEMS; NEMS},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Feasibility Analysis of a Novel Production Method for Monolithic Integrated MEMS with Nanogaps},
    venue = {Orlando, FL, USA},
    }
  • [DOI] A. Gharib, R. Weigel, and D. Kissinger, "A Versatile 10–80-Gb/s PRBS-Based Broadband Transmitter With Arbitrary 20–60-GHz Spectrum Shifting", IEEE Transactions on Microwave Theory and Techniques, pp. 3654-3666, 2016. [Bibtex]
    @article{gharib2016,
    author = {Gharib, Ahmed and Weigel, Robert and Kissinger, Dietmar},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057794},
    year = {2016},
    month = {10},
    doi = {10.1109/TMTT.2016.2606629},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    pages = {3654--3666},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A Versatile 10–80-Gb/s PRBS-Based Broadband Transmitter With Arbitrary 20–60-GHz Spectrum Shifting},
    }
  • D. Fey, M. Reichenbach, C. Söll, M. Biglari, J. Röber, and R. Weigel, "Using Memristor Technology for Multi-value Registers in Signed-digit Arithmetic Circuits" in The International Symposium on Memory Systems (MEMSYS), Washington, USA, 2016. [Bibtex]
    @inproceedings{fey2016a,
    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.},
    author = {Fey, Dietmar and Reichenbach, Marc and Söll, Christopher and Biglari, Mehrdad and Röber, Jürgen and Weigel, Robert},
    publisher = {Association for Computing Machinery},
    booktitle = {The International Symposium on Memory Systems (MEMSYS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060323},
    year = {2016},
    month = {10},
    faupublication = {yes},
    keywords = {Signed-digit arithmetic multi-bit memristors memristive computing; multi-bit memristors; memristive computing; GRK},
    peerreviewed = {Yes},
    title = {Using Memristor Technology for Multi-value Registers in Signed-digit Arithmetic Circuits},
    venue = {Washington, USA},
    }
  • [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), Phoenix, USA, 2016. [Bibtex]
    @inproceedings{soell2016,
    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.},
    author = {Söll, Christopher and Shi, Lan and Röber, Jürgen and Reichenbach, Marc and Weigel, Robert and Hagelauer, Amelie},
    booktitle = {IEEE International Conference on Image Processing (ICIP)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060253},
    year = {2016},
    month = {09},
    doi = {10.1109/ICIP.2016.7533193},
    faupublication = {yes},
    keywords = {Smart Camera; CMOS Image Sensor; Analog Processing Circuits; Analog Sobel; GRK-1773},
    peerreviewed = {Yes},
    title = {Low-Power Analog Smart Camera Sensor for Edge Detection},
    venue = {Phoenix, USA},
    }
  • [DOI] V. A. Silva Cortes, 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, Tours, France, 2016, pp. 1-4. [Bibtex]
    @inproceedings{silva2016a,
    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.},
    author = {Silva Cortes, Victor Arturo and Chauhan, Vikrant and Weigel, Robert and Fischer, Georg and Hagelauer, Amelie},
    publisher = {International Ultrasonics Symposium},
    booktitle = {IEEE International Ultrasonics Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060284},
    year = {2016},
    month = {09},
    day = {18},
    doi = {10.1109/ULTSYM.2016.7728397},
    eventdate = {2016-09-18/2016-09-21},
    eventtitle = {IEEE International Ultrasonics Symposium},
    faupublication = {yes},
    keywords = {RF frontend; BAW; Nonlinear modeling},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Nonlinear BAW Filter Effects on the Performance of an LTE Receiver},
    venue = {Tours, France},
    }
  • 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, Bremen, 2016, pp. 28-32. [Bibtex]
    @inproceedings{soell2016c,
    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.},
    author = {Söll, Christopher and Mai, Timo and Shi, Lan and Röber, Jürgen and Ußmüller, Thomas and Weigel, Robert and Hagelauer, Amelie},
    booktitle = {15. ITG/GMM-Fachtagung Analog 2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060317},
    year = {2016},
    month = {09},
    faupublication = {yes},
    isbn = {9783800742653},
    keywords = {analog pre-processing; operational amplifier; low-power; high-gain; folded-cascode; GRK-1773},
    pages = {28--32},
    peerreviewed = {Yes},
    title = {Low-Power High-Gain Operational Amplifier for Analog Image Pre-Processing in Smart Sensor Systems},
    venue = {Bremen},
    }
  • 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, Miltenberg, 2016. [Bibtex]
    @inproceedings{will2016a,
    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.},
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {URSI},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060304},
    year = {2016},
    month = {09},
    day = {26},
    eventdate = {2016-09-26/2016-09-28},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation},
    type = {Abstract zum Vortrag},
    venue = {Miltenberg},
    }
  • [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 (IUS), Tours, 2016, pp. 1-4. [Bibtex]
    @inproceedings{chauhan2016,
    abstract = {In this work, the Poly-Harmonic Distortion (PHD) model has been used to characterize the nonlinearities of Bulk Acoustic Wave (BAW) solidly mounted resonators (SMR). The new approach of using X-parameters for characterization and simulation of nonlinearities is described. The amplitude and phase of the fundamental mode and its harmonics up to third order have been measured and simulated by using the X-parameter framework. The simulation and measurement results for phase and amplitude of X-parameters describing the relations between incident and reflected harmonics of the same as well as different orders are shown. The X-parameter measurements of BAW components up to third order harmonics have been carried out with a nonlinear vector network analyzer (NVNA). These measurements under large-signal operating conditions were used to determine the nonlinear material constants responsible for the nonlinearity in BAW resonators.},
    author = {Chauhan, Vikrant and Tag, Andreas and Mayer, Markus and Weigel, Robert and Hagelauer, Amelie},
    booktitle = {IEEE International Ultrasonics Symposium (IUS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060313},
    year = {2016},
    month = {09},
    day = {18},
    doi = {10.1109/ULTSYM.2016.7728406},
    eventdate = {2016-09-18/2016-09-21},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Modeling Nonlinear Behavior of RF Bulk Acoustic Wave Resonators},
    venue = {Tours},
    }
  • [DOI] R. Weigel, F. Lurz, S. Lindner, S. Mann, S. Linz, and A. Koelpin, "A Fast and Precise Six-Port-based IFM Technique for Wireless Resonant SAW Sensing" in IEEE International Ultrasonics Symposium (IUS), Tours, France, 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},
    publisher = {IEEE},
    booktitle = {IEEE International Ultrasonics Symposium (IUS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060247},
    year = {2016},
    month = {09},
    day = {18},
    doi = {10.1109/ULTSYM.2016.7728613},
    eventdate = {2016-09-18/2016-09-21},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A Fast and Precise Six-Port-based IFM Technique for Wireless Resonant SAW Sensing},
    venue = {Tours, France},
    }
  • J. Kirchner, J. Nehring, G. A. Guarin Aristizabal, 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), Changchun, 2016, pp. 77-78. [Bibtex]
    @inproceedings{kirchner2016a,
    author = {Kirchner, Jens and Nehring, Johannes and Guarin Aristizabal, Gustavo Adolfo and Nasr, Ismail and Lämmle, Benjamin and Dietz, Marco and Weigel, Robert and Kissinger, Dietmar and Hagelauer, Amelie},
    booktitle = {9th Sin-German Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC2016)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060314},
    year = {2016},
    month = {09},
    faupublication = {yes},
    pages = {77--78},
    peerreviewed = {unknown},
    title = {SiGe Integrated Broadband Wireless Sensors for Biomedical Applications},
    venue = {Changchun},
    }
  • [DOI] S. N. Easwaran, S. K. Venugopal, and R. Weigel, "Current Regulator with Energy Limitation in the Unpowered State Featuring Bipolar Discharge Path" in IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), New Brunswick, NJ, USA, 2016, pp. 82-85. [Bibtex]
    @inproceedings{easwaran2016,
    abstract = {A new technique for limiting the surge current during short to battery in the unpowered state of low side driver is presented. This technique does not affect the main current regulation behavior in the powered state. The energy is limited to 28 micron Joules in the unpowered state and regulates the current to 3A in the powered state of the driver.},
    author = {Easwaran, Sri Navaneethakrishnan and Venugopal, Sunil Kashyap and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060325},
    year = {2016},
    month = {09},
    day = {25},
    doi = {10.1109/BCTM.2016.7738950},
    eventdate = {2016-09-25/2016-09-27},
    faupublication = {yes},
    pages = {82--85},
    peerreviewed = {Yes},
    title = {Current Regulator with Energy Limitation in the Unpowered State Featuring Bipolar Discharge Path},
    venue = {New Brunswick, NJ, USA},
    }
  • [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 Ferroelectrics 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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060294},
    year = {2016},
    month = {08},
    doi = {10.1109/TUFFC.2016.2615109},
    faupublication = {yes},
    issn = {0885-3010},
    journaltitle = {IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control},
    number = {8},
    pages = {1--8},
    peerreviewed = {Yes},
    shortjournal = {IEEE T ULTRASON FERR},
    title = {A Method for Accurate Modeling of BAW Filters at High Power Levels},
    volume = {63},
    }
  • [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, vol. 64, iss. 1, pp. 7804-7809, 2016. [Bibtex]
    @article{xie2016,
    author = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060270},
    year = {2016},
    month = {08},
    doi = {10.1109/TIE.2016.2598520},
    edition = {62},
    faupublication = {yes},
    issn = {0278-0046},
    journaltitle = {IEEE Transactions on Industrial Electronics},
    number = {1},
    pages = {7804--7809},
    peerreviewed = {Yes},
    shortjournal = {IEEE T IND ELECTRON},
    title = {Hysteresis Compensation Method for Magnetoresistive (MR) Sensors Based on Single Polar Controlled Magnetic Field Pulses},
    volume = {64},
    }
  • 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},
    booktitle = {International Bat Research Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060297},
    year = {2016},
    month = {08},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Enabling encounter detection for small vertebrates - dynamically reconfigurable sensor nodes for BATS},
    }
  • 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, Nuremberg, Germany, 2016. [Bibtex]
    @inproceedings{trautmann2016a,
    author = {Trautmann, Martin and Sanftl, Benedikt and Pflaum, Felix and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Integration of Sustainable Energy Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060320},
    year = {2016},
    month = {07},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Coupling Filter Design for Data Transmission in an Inductive Power Transfer Systems},
    venue = {Nuremberg, Germany},
    }
  • [DOI] C. Beck, H. J. Ng, R. Agethen, S. 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,
    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.},
    author = {Beck, Christopher and Ng, Herman Jalli and Agethen, Roman and Pour Mousavi, Seyed Mehran and Forstner, Hans-Peter and Wojnowski, Maciej and Pressel, Klaus and Weigel, Robert and Hagelauer, Amelie and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060322},
    year = {2016},
    month = {07},
    day = {07},
    doi = {10.1109/JSEN.2016.2587731},
    faupublication = {yes},
    issn = {1530-437X},
    journaltitle = {IEEE Sensors Journal},
    keywords = {SiGe RFICs; SiP modules; millimeter-wave circuits; packaging; radar systems},
    number = {17},
    pages = {6566--6578},
    peerreviewed = {Yes},
    shortjournal = {IEEE SENS J},
    title = {Industrial mmWave Radar Sensor in Embedded Wafer-Level BGA Packaging Technology},
    volume = {16},
    }
  • 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, Nuernberg, 2016. [Bibtex]
    @inproceedings{sanftl2016b,
    author = {Sanftl, Benedikt and Pflaum, Felix and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Integration of Sustainable Energy Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060307},
    year = {2016},
    month = {07},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Digital Transceiver Design for Data Communication in Inductive Power Transfer Systems},
    venue = {Nuernberg},
    }
  • [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), Lisbon, Portugal, 2016. [Bibtex]
    @inproceedings{shi2016,
    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.},
    author = {Shi, Lan and Hadlich, David and Söll, Christopher and Ußmüller, Thomas and Weigel, Robert},
    booktitle = {12th International Conference on PhD Research in Microelectronics and Electronics (PRIME)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060238},
    year = {2016},
    month = {06},
    doi = {10.1109/PRIME.2016.7519457},
    faupublication = {yes},
    keywords = {Image Processing; Tone Mapping; CMOS Image Sensor; Analog Circuit; GRK 1773},
    peerreviewed = {Yes},
    title = {A Tone Mapping Algorithm Suited for Analog-Signal Real-Time Image Processing},
    venue = {Lisbon, Portugal},
    }
  • 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, Nürnberg, 2016. [Bibtex]
    @inproceedings{dietz2016,
    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.},
    author = {Dietz, Marco and Schmidt, Christian and Trenz, Florian and Nehring, Johannes and Hagelauer, Amelie and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {Medizin Innovativ - MedTech Summit 2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060303},
    year = {2016},
    month = {06},
    faupublication = {yes},
    keywords = {Dehydratation; nicht-invasive Sensorik; Gesundheitsförderung; integrierte Diagnostik},
    peerreviewed = {No},
    title = {Dehydratations-Erkennung im Alltag durch integrierte nicht-invasive Sensorik},
    venue = {Nürnberg},
    }
  • [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, Vancouver, 2016, pp. 1-4. [Bibtex]
    @inproceedings{girg2016,
    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.},
    author = {Girg, Thomas and Beck, Christopher and Dietz, Marco and Hagelauer, Amelie and Kissinger, Dietmar and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {2016 IEEE 14th International NEWCAS Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060285},
    year = {2016},
    month = {06},
    day = {26},
    doi = {10.1109/NEWCAS.2016.7604745},
    eventdate = {2016-06-26/2016-06-29},
    eventtitle = {2016 IEEE 14th International NEWCAS Conference},
    faupublication = {yes},
    keywords = {SiGe BiCMOS; high data rate communication; 180 GHz; simultaneous phase and amplitude regenerative sampling; transmitter; frequency multiplier},
    pages = {1--4},
    peerreviewed = {No},
    title = {A 180 GHz Frequency Multiplier in a 130 nm SiGe BiCMOS Technology},
    type = {Konferenzschrift},
    venue = {Vancouver},
    }
  • [DOI] F. Xie, R. Weiß, and R. Weigel, "Simple Mathematical Operation-Based Calibration Method for Giant Magnetoresistive Current Sensor Applying B-Spline Modeling", IEEE Sensors Journal, vol. 16, iss. 12, pp. 4733-4739, 2016. [Bibtex]
    @article{xie2016b,
    abstract = {Nowadays, giant magnetoresistance (GMR)-based sensor technology is widely used in numerous industrial applications. However, an inexpensive and efficient method for compensating the nonlinear output of GMR spin valve sensors is still under the industrial prospect, which limits the application of the GMR sensors. By applying the B-Spline modeling, excellent results can be achieved; nevertheless, the sensor has to be calibrated in the whole temperature range. In this paper, a simple mathematical operation-based calibration method for GMR spin valve-type current sensors applying B-Spline modeling is introduced. Instead to measure dozens of temperatures and per temperature several hundreds of points, this method allows a calibration for each further sensor applying B-Spline modeling with only two temperatures and per temperature only 15 points. In comparison with the original calibration measurement over temperature for B-Spline modeling, the new calibration with minimized efforts shows outstanding measurement accuracy of ±0.6% at a nominal current of 50 A in a temperature range from -20 °C to 80 °C.},
    author = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060365},
    year = {2016},
    month = {06},
    day = {15},
    doi = {10.1109/JSEN.2016.2558468},
    faupublication = {yes},
    issn = {1530-437X},
    journaltitle = {IEEE Sensors Journal},
    number = {12},
    pages = {4733--4739},
    peerreviewed = {Yes},
    shortjournal = {IEEE SENS J},
    title = {Simple Mathematical Operation-Based Calibration Method for Giant Magnetoresistive Current Sensor Applying B-Spline Modeling},
    volume = {16},
    }
  • [DOI] V. A. Silva Cortes, 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), Krakow, Poland, 2016. [Bibtex]
    @inproceedings{silva2016,
    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.},
    author = {Silva Cortes, Victor Arturo 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},
    booktitle = {International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060295},
    year = {2016},
    month = {05},
    day = {09},
    doi = {10.1109/MIKON.2016.7492025},
    eventdate = {2016-05-09/2016-05-11},
    eventtitle = {International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Evaluation of a Multiphysical RF MEMS Oscillator Based on LTE Receiver Performance Requirements},
    venue = {Krakow, Poland},
    }
  • [DOI] S. N. Easwaran, S. K. Venugopal, and R. Weigel, "Voltage clamping circuit with ±100 mV precision in high-voltage OTA", Electronics Letters, vol. 52, iss. 11, pp. 921-923, 2016. [Bibtex]
    @article{easwaran2016b,
    abstract = {It is shown that precise output voltage clamping levels can be achieved under any operating condition by clamping the input of operational transconductance amplifier to a process insensitive reference and multiplexing the levels based on comparator decision. This circuit was implemented in a 40 V bipolar CMOS process. The fabricated circuit clamps the output voltage at 5.4 V with a precision of ±100 mV at 175°C on-chip junction temperature on the die. The input range for this circuit is between 100 mV and 25 V.},
    author = {Easwaran, Sri Navaneethakrishnan and Venugopal, Sunil Kashyap and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060250},
    year = {2016},
    month = {05},
    doi = {10.1049/EL.2016.0571},
    faupublication = {yes},
    issn = {0013-5194},
    journaltitle = {Electronics Letters},
    number = {11},
    pages = {921--923},
    peerreviewed = {Yes},
    shortjournal = {ELECTRON LETT},
    title = {Voltage clamping circuit with ±100 mV precision in high-voltage OTA},
    volume = {52},
    }
  • [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, Krakow, Poland, 2016. [Bibtex]
    @inproceedings{trenz2016,
    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.},
    author = {Trenz, Florian and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {MIKON 2016 - International Conference on Microwave, Radar and Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060254},
    year = {2016},
    month = {05},
    day = {09},
    doi = {10.1109/MIKON.2016.7491935},
    eventdate = {2016-05-09/2016-05-09},
    eventtitle = {21st International Conference on Microwaves, Radar and Wireless Communications (MIKON)},
    faupublication = {yes},
    keywords = {Biomedical measurement; Microwave sensors; Biosensors; Reflectometry},
    peerreviewed = {Yes},
    title = {Evaluation of a Reflection Based Dehydration Sensing Method for Wristwatch Integration},
    type = {Konferenzschrift},
    venue = {Krakow, Poland},
    volume = {21},
    }
  • [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), Krakau, Poland, 2016, pp. 1-4. [Bibtex]
    @inproceedings{wibbing2016a,
    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.},
    author = {Wibbing, Sascha and Mann, Sebastian and Lurz, Fabian and Erhardt, Stefan and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {21st International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060243},
    year = {2016},
    month = {05},
    day = {09},
    doi = {10.1109/MIKON.2016.7491940},
    eventdate = {2016-05-09/2016-05-11},
    faupublication = {yes},
    isbn = {9781509022144},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A cost-efficient 61 GHz high-resolution radar sensor for industrial positioning and distance measurement},
    venue = {Krakau, Poland},
    }
  • [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,
    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.},
    author = {Steinhäußer, Frank and Talai, Armin and Koelpin, Alexander and Weigel, Robert and Bittner, Achim and Schmid, Ulrich},
    publisher = {Elsevier},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060271},
    year = {2016},
    month = {05},
    doi = {10.1016/J.CERAMINT.2016.02.149},
    faupublication = {yes},
    issn = {0272-8842},
    journaltitle = {Ceramics International},
    keywords = {LTCC; porosification},
    number = {7},
    pages = {8925--8931},
    peerreviewed = {Yes},
    shortjournal = {CERAM INT},
    title = {Permittivity Reduction and Surface Modification by Porosification of LTCC},
    volume = {42},
    }
  • [DOI] M. Sporer, R. Weigel, and A. Koelpin, "A Planar Reconfigurable Focal Plane Array Antenna for 24 GHz" in IEEE International Microwave Symposium, San Francisco, USA, 2016, pp. 1-3. [Bibtex]
    @inproceedings{sporer2016,
    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.},
    author = {Sporer, Michael and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060273},
    year = {2016},
    month = {05},
    day = {22},
    doi = {10.1109/MWSYM.2016.7540286},
    eventdate = {2016-05-22/2016-05-27},
    eventtitle = {IEEE International Microwave Symposium (IMS)},
    faupublication = {yes},
    keywords = {focal plane array; polarization control; pin-diode switches; aperture coupling},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A Planar Reconfigurable Focal Plane Array Antenna for 24 GHz},
    type = {Konferenzschrift},
    venue = {San Francisco, USA},
    }
  • [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), Taipei, Taiwan, 2016, pp. 369-374. [Bibtex]
    @inproceedings{lurz2016a,
    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.},
    author = {Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE International Instrumentation and Measurement Technology Conference (I2MTC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060252},
    year = {2016},
    month = {05},
    day = {23},
    doi = {10.1109/I2MTC.2016.7520390},
    eventdate = {2016-05-23/2016-05-26},
    faupublication = {yes},
    pages = {369--374},
    peerreviewed = {Yes},
    title = {Precise and Fast Frequency Determination of Resonant SAW Sensors by a Low-Cost Six-Port Interferometer},
    venue = {Taipei, Taiwan},
    }
  • [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), San Francisco, USA, 2016, pp. 1-4. [Bibtex]
    @inproceedings{roeber2016,
    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.},
    author = {Röber, Jürgen and Senega, Simon and Bänisch, Andreas and Hagelauer, Amelie and Weigel, Robert and Lindenmeier, Stefan},
    publisher = {IEEE},
    booktitle = {IEEE MTT International Microwave Symposium (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060289},
    year = {2016},
    month = {05},
    doi = {10.1109/MWSYM.2016.7540318},
    eventtitle = {IEEE MTT International Microwave Symposium (IMS)},
    faupublication = {yes},
    keywords = {SDARS; Diversity; LNA; Phase Shifter; Power Combiner; Integrated Circuit; RF Front-end},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Integrated Diversity Front-End for Digital Satellite Radio Reception},
    venue = {San Francisco, USA},
    }
  • [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, San Diego, USA, 2016. [Bibtex]
    @inproceedings{sanftl2016,
    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.},
    author = {Sanftl, Benedikt and Joffe, Christopher and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE MTT-S},
    booktitle = {IEEE MTT-S International Conference on Microwaves for Intelligent Mobility},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060256},
    year = {2016},
    month = {05},
    doi = {10.1109/ICMIM.2016.7533929},
    eventtitle = {IEEE MTT-S International Conference on Microwaves for Intelligent Mobility},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Reliabe Data Link for Power Transfer Control in an Inductive Charging System for Electric Vehicles},
    venue = {San Diego, USA},
    }
  • [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), Aveiro, Portugal, 2016, pp. 1-4. [Bibtex]
    @inproceedings{sanftl2016a,
    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.},
    author = {Sanftl, Benedikt and Pflaum, Felix and Trautmann, Martin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE MTT-S},
    booktitle = {Wireless Power Transfer Conference (WPTC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060306},
    year = {2016},
    month = {05},
    doi = {10.1109/WPT.2016.7498830},
    eventtitle = {Wireless Power Transfer Conference 2016 (WPTC)},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A Novel Approach for Reliable Communications within Inductive Power Transfer Systems},
    venue = {Aveiro, Portugal},
    }
  • 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,
    abstract = {Hochfrequenz-Radarsensoren sind eine viel\-versprechende 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.},
    author = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {Hüthig GmbH},
    booktitle = {elektronik industrie 04/2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060251},
    year = {2016},
    month = {04},
    faupublication = {yes},
    pages = {56--57},
    peerreviewed = {No},
    title = {Detektion und Auswertung: Labview-basierte Echtzeitsignalverarbeitung für die Radarsensorik},
    type = {Zeitungsartikel},
    url = {http://www.elektronik-industrie.de/2016/04/12/elektronik-industrie-042016/},
    }
  • [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 German Microwave Conference (GeMiC), Bochum, 2016, pp. 165-168. [Bibtex]
    @inproceedings{mann2016a,
    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.},
    author = {Mann, Sebastian and Linz, Sarah and Erhardt, Stefan and Lindner, Stefan and Lurz, Fabian and Maune, Holger and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060264},
    year = {2016},
    month = {03},
    day = {14},
    doi = {10.1109/GEMIC.2016.7461581},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    pages = {165--168},
    peerreviewed = {Yes},
    title = {Differential Measuring Dual Six-Port Concept and Antenna Design for an Inline Foil Thickness Sensor},
    venue = {Bochum},
    }
  • [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, Bochum, Germany, 2016, pp. 433-436. [Bibtex]
    @inproceedings{hsieh2016,
    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.},
    author = {Hsieh, Chia-Yu and Röber, Jürgen and Bänisch, Andreas and Hagelauer, Amelie and Ußmüller, Thomas and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {GeMiC 2016, German Microwave Conference 2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060248},
    year = {2016},
    month = {03},
    doi = {10.1109/GEMIC.2016.7461648},
    eventtitle = {GeMiC 2016, German Microwave Conference 2016},
    faupublication = {yes},
    keywords = {positioning; class-E},
    pages = {433--436},
    peerreviewed = {Yes},
    title = {A low power CMOS transmitter with Class-E power amplifiers for positioning application in multi-band},
    venue = {Bochum, Germany},
    }
  • [DOI] S. Fuchs and R. Weigel, "Advanced receiver testing in a high volume environment using pogo cross-talk a case study" in German Microwave Conference, Bochum, 2016, pp. 57-60. [Bibtex]
    @inproceedings{fuchs2016,
    abstract = {More and more frequency bands as well as receiver ports are integrated in a single silicon device. This is caused by the rapid development of cellular technologies towards highly integrated multimode transceivers capable of worldwide interoperability in multiple frequency bands. For ensuring highest quality standards in customer delivery, accurate testing and characterization of all these ports is essential. However, the high volume testing becomes increasingly more time consuming due to the number of ports and the respective tester interface PCB (printed circuit board) design. This paper demonstrates a feasible way to increase throughput by higher multisite efficiency with sharing one internal RF-source by using pogo cross-talk.},
    author = {Fuchs, Stephan and Weigel, Robert},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060308},
    year = {2016},
    month = {03},
    day = {14},
    doi = {10.1109/GEMIC.2016.7461555},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    pages = {57--60},
    peerreviewed = {Yes},
    title = {Advanced receiver testing in a high volume environment using pogo cross-talk a case study},
    venue = {Bochum},
    }
  • [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 German Microwave Conference (GeMiC), Bochum, 2016, pp. 389-392. [Bibtex]
    @inproceedings{wibbing2016,
    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.},
    author = {Wibbing, Sascha and Lurz, Fabian and Mann, Sebastian and Lindner, Stefan and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060278},
    year = {2016},
    month = {03},
    day = {14},
    doi = {10.1109/GEMIC.2016.7461637},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    pages = {389--392},
    peerreviewed = {Yes},
    title = {Determining Linearity of Wideband FMCW-Systems Based on Low-Cost Six-Port Technology},
    venue = {Bochum},
    }
  • [DOI] 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,
    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.},
    author = {Steinhäußer, Frank and Talai, Armin and Sandulache, Gabriela and Weigel, Robert and Koelpin, Alexander and Hansal, Wolfgang and Bittner, Achim and Schmid, Ulrich},
    publisher = {Elsevier},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060242},
    year = {2016},
    month = {03},
    doi = {10.1016/J.MICROREL.2016.02.010},
    faupublication = {yes},
    issn = {0026-2714},
    journaltitle = {Microelectronics Reliability},
    keywords = {LTCC; porosification},
    pages = {93--100},
    peerreviewed = {Yes},
    shortjournal = {MICROELECTRON RELIAB},
    title = {Pulse Plated Silver Metallization on Porosified Low Temperature Co-fired Ceramics for High Frequency Applications},
    volume = {60},
    }
  • [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), Bochum, 2016, pp. 457-460. [Bibtex]
    @inproceedings{talai2016,
    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.},
    author = {Talai, Armin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060309},
    year = {2016},
    month = {03},
    day = {14},
    doi = {10.1109/GEMIC.2016.7461654},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    keywords = {Antenna Array; Grounded CoplanarWaveguide; Differential Frequency; Electromagnetic Simulation; Floating Ground; Material Characterization; Relative Permittivity},
    pages = {457--460},
    peerreviewed = {Yes},
    title = {A Grounded Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor},
    venue = {Bochum},
    }
  • [DOI] T. Fersch, A. Buhmann, A. Koelpin, and R. Weigel, "The Influence of Rain on Small Aperture LiDAR Sensors" in German Microwave Conference, Bochum, 2016, pp. 84-87. [Bibtex]
    @inproceedings{fersch2016,
    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.},
    author = {Fersch, Thomas and Buhmann, Alexander and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060281},
    year = {2016},
    month = {03},
    day = {14},
    doi = {10.1109/GEMIC.2016.7461562},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    isbn = {9783981266870},
    keywords = {LiDAR},
    pages = {84--87},
    peerreviewed = {Yes},
    title = {The Influence of Rain on Small Aperture LiDAR Sensors},
    venue = {Bochum},
    }
  • [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", Advances in Radio Science : Kleinheubacher Berichte, vol. 13, pp. 269-278, 2016. [Bibtex]
    @article{krause2014,
    author = {Krause, David and John, Werner and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060292},
    year = {2016},
    month = {03},
    day = {21},
    doi = {10.5194/ARS-13-269-2016},
    faupublication = {yes},
    issn = {1684-9965},
    journaltitle = {Advances in Radio Science : Kleinheubacher Berichte},
    pages = {269--278},
    peerreviewed = {Yes},
    title = {Investigations on the Magnetic Field Coupling of Automotive High Voltage Systems to Determine Relevant Parameters for an EMR-optimized Designing},
    volume = {13},
    }
  • 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" in Ecology and Evolution, 2016. [Bibtex]
    @inproceedings{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},
    booktitle = {Ecology and Evolution},
    cris = {https://cris.fau.de/converis/publicweb/publication/1044704},
    year = {2016},
    month = {02},
    faupublication = {no},
    peerreviewed = {Yes},
    title = {Automated proximity sensing in small vertebrates: design of miniaturized sensor nodes and first field tests in bats},
    type = {Konferenzschrift},
    }
  • 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, Prague, 2016, pp. 1-6. [Bibtex]
    @inproceedings{fey2016,
    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.},
    author = {Fey, Dietmar and Reichenbach, Marc and Söll, Christopher and Weigel, Robert},
    booktitle = {HIPEAC Workshop on Memristor Technology, Design, Automation and Computing},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060268},
    year = {2016},
    month = {01},
    faupublication = {yes},
    keywords = {Memristor; GRK-1773},
    pages = {1--6},
    peerreviewed = {Yes},
    title = {Evaluating Signed-digit Arithmetic Circuits using Multi-level storing Memristors},
    venue = {Prague},
    }
  • [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), Austin, Texas, USA, 2016, pp. 31-34. [Bibtex]
    @inproceedings{will2016,
    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.},
    author = {Will, Christoph and Shi, Kilin and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060240},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444314},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    keywords = {Radar interferometry; Biomedical signal processing; Template matching},
    pages = {31--34},
    peerreviewed = {Yes},
    title = {Instantaneous Heartbeat Detection using a Cross-Correlation based Template Matching for Continuous Wave Radar Systems},
    venue = {Austin, Texas, USA},
    }
  • [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), Austin, Texas, USA, 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},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060290},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444321},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    pages = {56--59},
    peerreviewed = {Yes},
    title = {Digital Phase Correction for Multiplexed ADCs in Low-Cost Six-Port Interferometers},
    venue = {Austin, Texas, USA},
    }
  • [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), Austin, Texas, USA, 2016, pp. 60-63. [Bibtex]
    @inproceedings{staszek2016,
    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.},
    author = {Staszek, Kamil and Linz, Sarah and Lurz, Fabian and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE MTT-S},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060277},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444322},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    keywords = {six-port; reflectometer; radar; calibration; technique; displacement measurements},
    pages = {60--63},
    peerreviewed = {Yes},
    title = {Improved Calibration Procedure for Six-Port Based Precise Displacement Measurements},
    venue = {Austin, Texas, USA},
    }
  • [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,
    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.},
    author = {Kloc, Matej and Franchi, Norman and Gardill, Markus and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060267},
    year = {2016},
    month = {01},
    doi = {10.1109/WISNET.2016.7444307},
    eventtitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    faupublication = {yes},
    pages = {7--10},
    peerreviewed = {Yes},
    title = {Low Latency Evaluation of an Adaptive Industrial Wireless Communications System for ISM Bands},
    }
  • [DOI] 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, 2016. [Bibtex]
    @article{talai2016a,
    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.},
    author = {Talai, Armin and Gold, Gerald and Frank, Martin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {Walter de Gruyter GmbH},
    cris = {https://cris.fau.de/converis/publicweb/publication/1055791},
    year = {2016},
    month = {01},
    doi = {10.1515/FREQ-2016-0201},
    faupublication = {yes},
    issn = {0016-1136},
    journaltitle = {Frequenz},
    peerreviewed = {Yes},
    shortjournal = {FREQUENZ},
    title = {A Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor for Bulk and Metallized Dielectrics},
    }
  • [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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060302},
    year = {2016},
    month = {01},
    doi = {10.1109/MMM.2015.2487922},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {1},
    pages = {70--78},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Let's Make Them Cognitive! Cognitive Radio Technology Applied to Professional Wireless Microphone Systems},
    volume = {17},
    }
  • [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), Austin, Texas, USA, 2016, pp. 101-104. [Bibtex]
    @inproceedings{trautmann2016,
    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.},
    author = {Trautmann, Martin and Joffe, Christopher and Pflaum, Felix and Sanftl, Benedikt and Weigel, Robert and Heckel, Thomas and Koelpin, Alexander},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060269},
    year = {2016},
    month = {01},
    doi = {10.1109/WISNET.2016.7444333},
    faupublication = {yes},
    keywords = {data transfer; inductive power transmission; plugs; power filters; wireless communication},
    pages = {101--104},
    peerreviewed = {Yes},
    title = {Implementation of Simultaneous Energy and Data Transfer in a Contactless Connector},
    venue = {Austin, Texas, USA},
    }
  • [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), Austin, TX, USA, 2016, pp. 64-66. [Bibtex]
    @inproceedings{mann2016,
    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.},
    author = {Mann, Sebastian and Lurz, Fabian and Linz, Sarah and Lindner, Stefan and Will, Christoph and Wibbing, Sascha and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060299},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444323},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    keywords = {Interferometer; Six-Port; RADAR; phase measurement; nearfield sensor; millimeter-wave},
    number = {66},
    pages = {64--66},
    peerreviewed = {Yes},
    title = {Substrate Integrated Waveguide Fed Antenna for 61 GHz Ultra-Short-Range Interferometric Radar Systems},
    venue = {Austin, TX, USA},
    volume = {64},
    }
  • [DOI] L. Shi, C. Söll, B. Pfundt, A. Bänisch, M. Reichenbach, J. Seiler, T. Ussmueller, and R. Weigel, "A flexible mixed-signal image processing pipeline using 3D chip stacks", Journal of Real-Time Image Processing, pp. 1-18, 2016. [Bibtex]
    @article{shi2016b,
    abstract = {This work presents a highly flexible mixed-signal 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. Different aspects 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. Moreover, 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 carry out spatial operations, the state-of-the-art sensor is modified to be able to read out multiple pixels at the same time. This allows analog spatial filter operations which consume significantly less power. As an example, an averaging filter is described which 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.},
    author = {Shi, Lan and Söll, Christopher and Pfundt, Benjamin and Bänisch, Andreas and Reichenbach, Marc and Seiler, Jürgen and Ussmueller, Thomas and Weigel, Robert},
    publisher = {Springer Verlag (Germany)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1052889},
    year = {2016},
    doi = {10.1007/S11554-016-0628-5},
    faupublication = {yes},
    issn = {1861-8200},
    journaltitle = {Journal of Real-Time Image Processing},
    keywords = {3D chip stacking; Analog pre-processing; Application optimized image pipeline; Partitioning; Smart camera},
    pages = {1--18},
    peerreviewed = {Yes},
    shortjournal = {J REAL-TIME IMAGE PR},
    title = {A flexible mixed-signal image processing pipeline using 3D chip stacks},
    type = {undefined},
    url = {https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84982095381&origin=inward},
    }
  • 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},
    booktitle = {Weissbuch der ITG im VDE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060301},
    year = {2016},
    faupublication = {no},
    pages = {1--56},
    peerreviewed = {No},
    title = {Die Zukunft der Satellitenkommunikation},
    type = {Working Paper},
    }
  • 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},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1044712},
    year = {2016},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Low-weight Wireless Sensor Node for Animal Encounter Detection and Dual-band Localization},
    type = {Konferenzschrift},
    }
  • R. Löhr, F. Ohnhäuser, J. Röber, and R. Weigel, "Switch Bootstrapping in a 1.5 Bit Pipeline Stage" in Analog2016, Bremen, 2016, pp. 49-52. [Bibtex]
    @inproceedings{loehr2016,
    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.},
    author = {Löhr, Robert and Ohnhäuser, Frank and Röber, Jürgen and Weigel, Robert},
    booktitle = {Analog2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060272},
    year = {2016},
    eventtitle = {Analog2016},
    faupublication = {yes},
    keywords = {1.5 bit,switch bootstrapping,MDAC,charge injection,external reference,non-linearity},
    pages = {49--52},
    peerreviewed = {Yes},
    title = {Switch Bootstrapping in a 1.5 Bit Pipeline Stage},
    venue = {Bremen},
    }

2015

  • [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), Nanjing, China, 2015, pp. 1-3. [Bibtex]
    @inproceedings{mueller2015d,
    author = {Müller, Felix and Benesch, Sebastian and Steinbuch, W. and Walter, Thomas and Weigel, Robert},
    booktitle = {Asia-Pacific Microwave Conference (APMC2015)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060180},
    year = {2015},
    month = {12},
    day = {06},
    doi = {10.1109/APMC.2015.7413451},
    eventdate = {2015-12-06/2015-12-09},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Mitigation of Weak Targets’ Masking due to Nonlinearities in Chirp Sequence FMCW Automotive Radar at 77 GHz},
    venue = {Nanjing, China},
    }
  • A. Hagelauer, W. Akstaller, A. Tag, and R. Weigel, "Characterization and Modeling of Nonlinearities in RF BAW Components for Mobile Communication" in Sixth International Symposium on Acoustic Wave Devices for Future Mobile Communication, Chiba, Japan, 2015, pp. 18-23. [Bibtex]
    @inproceedings{hagelauer2015,
    author = {Hagelauer, Amelie and Akstaller, Wolfgang and Tag, Andreas and Weigel, Robert},
    booktitle = {Sixth International Symposium on Acoustic Wave Devices for Future Mobile Communication},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060155},
    year = {2015},
    month = {11},
    day = {24},
    eventdate = {2015-11-24/2015-11-25},
    faupublication = {yes},
    pages = {18--23},
    peerreviewed = {unknown},
    title = {Characterization and Modeling of Nonlinearities in RF BAW Components for Mobile Communication},
    venue = {Chiba, Japan},
    }
  • [DOI] A. Radwan, 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,
    abstract = {In this paper, two proposed bandwidth (BW) extension techniques are discussed and analytically analyzed. The capabilities of the proposed feedback techniques are demonstrated with two design examples of different circuitry, supported by simulation and measurement results. The first design example is a broadband low-power active balun, employing one of the presented feedback techniques. It is capable of operating with a gain of 2.2 dB and BW of more than 70 GHz. The amplitude imbalance is less than 2.4 dB, while the phase imbalance is below 7 ° up to 60 GHz and 14 ° up to 70 GHz, consuming a low-power of 29.7 mW. The second design example is a differential three-stage amplifier, incorporating the two techniques, where their combined performance achieves a gain of 54 dB and a 3-dB BW of 25 GHz, resulting in a gain-BW product (GBP) of 12.5 THz, with a power consumption of 180 mW from a 3.3-V supply. The chips are fabricated in a 0.35- µm SiGe:C bipolar technology with a ft/ fmax of 200/250 GHz.},
    author = {Radwan, Ahmed and Weigel, Robert and Kissinger, Dietmar},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060184},
    year = {2015},
    month = {11},
    doi = {10.1109/TMTT.2015.2481398},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {11},
    pages = {3701--3712},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Broadband Circuit Techniques for Multi-Terahertz Gain-Bandwidth-Product Low-Power Applications},
    volume = {63},
    }
  • [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), Nusa Dua, Bali, 2015. [Bibtex]
    @inproceedings{loehr2015,
    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.},
    author = {Löhr, Robert and Kempf, Markus and Ohnhäuser, Frank and Röber, Jürgen and Weigel, Robert and Bänisch, Andreas},
    booktitle = {International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060185},
    year = {2015},
    month = {11},
    doi = {10.1109/ISPACS.2015.7432788},
    eventtitle = {International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Implementation of a High-Speed Flash ADC for High Performance Pipeline ADCs in an 180nm CMOS Process},
    venue = {Nusa Dua, Bali},
    }
  • [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), Bali, Indonesia, 2015, pp. 279-284. [Bibtex]
    @inproceedings{soell2015b,
    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.},
    author = {Söll, Christopher and Shi, Lan and Bänisch, Andreas and Ußmüller, Thomas and Weigel, Robert},
    booktitle = {IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060227},
    year = {2015},
    month = {11},
    doi = {10.1109/ISPACS.2015.7432780},
    faupublication = {yes},
    keywords = {Smart Cameras; CMOS Image Sensors; Analog Processing Circuits; Filtering Algorithms; GRK-1773},
    pages = {279--284},
    peerreviewed = {Yes},
    title = {A CMOS Image Sensor with Analog Pre-Processing Capability Suitable for Smart Camera Applications},
    venue = {Bali, Indonesia},
    }
  • 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, Erlangen, 2015. [Bibtex]
    @inproceedings{schmidt2015,
    author = {Schmidt, Christian and Dietz, Marco and Trenz, Florian and Nehring, Johannes and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {Fußball 4.0 - Jahrestagung der dvs-Kommission Fußball},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060170},
    year = {2015},
    month = {11},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Miniaturisierte Dehydratations-Sensorik im Leistungssport},
    venue = {Erlangen},
    }
  • [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 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), Nusa Dua, Bali, Indonesia, 2015, pp. 483-487. [Bibtex]
    @inproceedings{will2015,
    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.},
    author = {Will, Christoph and Shi, Kilin and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060157},
    year = {2015},
    month = {11},
    day = {09},
    doi = {10.1109/ISPACS.2015.7432820},
    eventdate = {2015-11-09/2015-11-12},
    faupublication = {yes},
    keywords = {Six-Port; Interferometers; Biomedical signal processing; Heartbeat monitoring},
    pages = {483--487},
    peerreviewed = {Yes},
    title = {Intelligent Signal Processing Routine for Instantaneous Heart Rate Detection using a Six-Port Microwave Interferometer},
    venue = {Nusa Dua, Bali, Indonesia},
    }
  • 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,
    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.},
    author = {Kloc, Matej and Franchi, Norman and Gardill, Markus and Weigel, Robert},
    language = {English},
    booktitle = {Wireless Innovation Forum European Conference on Communication Technologies and Software Defined Radio (WInnComm-Europe)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060216},
    year = {2015},
    month = {10},
    eventtitle = {Wireless Innovation Forum European Conference on Communication Technologies and Software Defined Radio (WInnComm-Europe)},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Cognitive Multi-Radio as Enabler for Deterministic Dynamic Spectrum Access},
    }
  • 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), Karlsruhe, 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},
    booktitle = {Mikrosystemtechnik Kongress (MST)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060222},
    year = {2015},
    month = {10},
    day = {26},
    eventdate = {2015-10-26/2015-10-28},
    faupublication = {yes},
    isbn = {9783800741007},
    keywords = {LTCC},
    pages = {396--399},
    peerreviewed = {Yes},
    title = {Modellierung nass-chemischer Porosizierverahren auf LTCC für elektromagnetische Hochfrequenz Feldsimulation},
    venue = {Karlsruhe},
    }
  • 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), Karlsruhe, Germany, 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},
    language = {German},
    booktitle = {Mikrosystemtechnik-Kongress (MST)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060172},
    year = {2015},
    month = {10},
    day = {26},
    eventdate = {2015-10-26/2015-10-28},
    faupublication = {yes},
    isbn = {9783800741007},
    pages = {274--277},
    peerreviewed = {Yes},
    title = {System- und Schaltungskonzepte für Low-Power-Radarsensorik zur Anwesenheitsdetektion},
    venue = {Karlsruhe, Germany},
    }
  • [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, Taipei, Taiwan, 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},
    publisher = {IEEE},
    booktitle = {IEEE International Ultrasonics Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060160},
    year = {2015},
    month = {10},
    day = {21},
    doi = {10.1109/ULTSYM.2015.0115},
    eventdate = {2015-10-21/2015-10-24},
    eventtitle = {IEEE International Ultrasonics Symposium (IUS)},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Multiphysics Modeling of BAW Filter},
    venue = {Taipei, Taiwan},
    }
  • [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 Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC), Taormina, Italy, 2015, pp. 1-3. [Bibtex]
    @inproceedings{mueller2015c,
    abstract = {A method to determine the maximum allowable frequency error of a PLL generated FMCW radar slope is presented. Using the side lobe suppression as a metric, the maximum frequency error in a linear FMCW slope is defined based on the used window function. With higher distortion frequency a higher side lobe suppression is required. It is shown that for fast chirp sequence modulation in the absence of any additional counter measures, the minimum allowable frequency error is on the order of a few kHz, which is nearly impossible to be achieved by commercial radar systems.},
    author = {Müller, Felix and Steinbuch, Dirk and Steinhauer, Matthias and Walter, Thomas and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Integrated Nonlinear Microwave and Millimetre-wave Circuits Workshop (INMMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060178},
    year = {2015},
    month = {10},
    day = {01},
    doi = {10.1109/INMMIC.2015.7330384},
    eventdate = {2015-10-01/2015-10-02},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {unknown},
    title = {Defining Acceptable Phase-Modulated Nonlinearities in 77 GHz FMCW Automotive Radar Systems},
    venue = {Taormina, Italy},
    }
  • [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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060161},
    year = {2015},
    month = {10},
    doi = {10.1109/TUFFC.2015.007036},
    faupublication = {yes},
    issn = {0885-3010},
    journaltitle = {IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control},
    number = {10},
    pages = {1856--1864},
    peerreviewed = {Yes},
    shortjournal = {IEEE T ULTRASON FERR},
    title = {Impact of Spatial Distribution of Dissipated Power to Modeling of SMR BAW Resonators at High Power Levels},
    volume = {62},
    }
  • 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 Rahman; Heinze, Ed., VDE-Verlag, 2015, pp. 245-248. [Bibtex]
    @inbook{lurz2015a,
    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.},
    author = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    editor = {Jamal, Rahman; Heinze, Ronald},
    language = {German},
    publisher = {VDE-Verlag},
    booktitle = {Virtuelle Instrumente in der Praxis 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060173},
    year = {2015},
    month = {10},
    faupublication = {yes},
    isbn = {9783800736690},
    pages = {245--248},
    peerreviewed = {Yes},
    title = {LabVIEW basierte Echtzeit-Signalverarbeitung für Low-Power-Radarsensorik},
    type = {Band aus einer Reihe},
    url = {https://www.vde-verlag.de/buecher/483669/virtuelle-instrumente-in-der-praxis-2015.html},
    }
  • [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 International Conference on Electromagnetics in Advanced Applications (ICEAA), Karlsruhe, 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},
    publisher = {IEEE},
    booktitle = {International Conference on Electromagnetics in Advanced Applications (ICEAA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060159},
    year = {2015},
    month = {10},
    day = {12},
    doi = {10.1109/ICEAA.2011.6046404},
    eventdate = {2011-09-12/2011-09-16},
    faupublication = {yes},
    pages = {258--261},
    peerreviewed = {Yes},
    title = {Poröses LTCC als Substratmaterial für Höchstfrequenzradarsensoren},
    venue = {Karlsruhe},
    }
  • 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 Rahman; Heinze, Ed., VDE-Verlag, 2015, pp. 376-382. [Bibtex]
    @inbook{gardill2015,
    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.},
    author = {Gardill, Markus and Linz, Sarah and Fischer, Georg and Weigel, Robert},
    editor = {Jamal, Rahman; Heinze, Ronald},
    publisher = {VDE-Verlag},
    booktitle = {Virtuelle Instrumente in der Praxis 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060210},
    year = {2015},
    month = {10},
    faupublication = {yes},
    isbn = {9783800736690},
    pages = {376--382},
    peerreviewed = {Yes},
    title = {Praktikumsversuch CW/FMCW-Radar auf Basis von myRIO},
    type = {Band aus einer Reihe},
    }
  • [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 Conference (EuMC), Paris, France, 2015, pp. 566-569. [Bibtex]
    @inproceedings{erhart2015a,
    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.},
    author = {Erhart, Christian and Lutz, Steffen and Köhler, Johannes and Mantz, Hubert and Walter, Thomas and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060200},
    year = {2015},
    month = {09},
    day = {07},
    doi = {10.1109/EUMC.2015.7345826},
    eventdate = {2015-09-07/2015-09-10},
    faupublication = {yes},
    pages = {566--569},
    peerreviewed = {Yes},
    title = {Surface velocity estimation of uids using millimetre-wave radar},
    venue = {Paris, France},
    }
  • [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, Paris, France, 2015. [Bibtex]
    @inproceedings{trenz2015,
    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.},
    author = {Trenz, Florian and Hofmann, Maximilian and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {2015 European Microwave Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060171},
    year = {2015},
    month = {09},
    day = {06},
    doi = {10.1109/EUMC.2015.7345765},
    eventdate = {2015-09-06/2015-09-11},
    eventtitle = {The European Microwave Conference},
    faupublication = {yes},
    keywords = {Reflectometry; sixport; Microwave circuits; broadband},
    peerreviewed = {Yes},
    title = {A Broadband 3-29 GHz Reflectometer with a Frequency Compensated Multilayer Sixport Structure},
    type = {Konferenzschrift},
    venue = {Paris, France},
    }
  • [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 (EuMC), Paris, France, 2015, pp. 52-55. [Bibtex]
    @inproceedings{bauch2015,
    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.},
    author = {Bauch, Andreas and Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060193},
    year = {2015},
    month = {09},
    day = {07},
    doi = {10.1109/EUMC.2015.7345697},
    eventdate = {2015-09-07/2015-09-10},
    faupublication = {yes},
    pages = {52--55},
    peerreviewed = {Yes},
    title = {A 2-30 GHz Multi-Octave Planar Microwave Six-Port for Reflectometry Applications},
    venue = {Paris, France},
    }
  • [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), Taipei, Taiwan, 2015. [Bibtex]
    @inproceedings{trenz2015a,
    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.},
    author = {Trenz, Florian and Kalpen, Victoria and Weigel, Robert and Kissinger, Dietmar},
    language = {English},
    booktitle = {IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications(IMWS-Bio 2015)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060175},
    year = {2015},
    month = {09},
    day = {21},
    doi = {10.1109/IMWS-BIO.2015.7303761},
    eventdate = {2015-09-21/2015-09-23},
    eventtitle = {IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications},
    faupublication = {yes},
    keywords = {Biomedical measurement; Biomedical monitoring; Biological system modeling; Microwave sensors; Biosensors; Phantoms},
    peerreviewed = {Yes},
    title = {Modeling and Measurement of a Tissue-Equivalent Liquid for Noninvasive Dehydration Sensing in the 2.45 GHz ISM-Band},
    type = {Konferenzschrift},
    venue = {Taipei, Taiwan},
    }
  • 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), Siegen, Germany, 2015, pp. 107-114. [Bibtex]
    @inproceedings{lindner2015b,
    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 %.},
    author = {Lindner, Claus and Söll, Christopher and Röber, Jürgen and Bänisch, Andreas and Weigel, Robert},
    booktitle = {8. GMM/ITG/GI-Fachtagung Zuverlässigkeit und Entwurf (ZuE)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060202},
    year = {2015},
    month = {09},
    faupublication = {yes},
    isbn = {9783800740710},
    keywords = {Yield Analysis; Active Cmos Pixel; Image Sensor; Correlated Double Sampling; Double Sampling; Simulation Method; GRK-1773},
    pages = {107--114},
    peerreviewed = {Yes},
    title = {Yield Analysation and Optimization Methods for Active CMOS Pixels},
    venue = {Siegen, Germany},
    }
  • F. Müller, D. Steinbuch, T. Walter, and R. Weigel, "Modellierung und Simulation von Einschwingvorgängen bei Automobilradaren mit Chirp-Sequence-Modulation" in Kleinheubacher Tagung, Miltenberg, 2015. [Bibtex]
    @inproceedings{mueller2015b,
    author = {Müller, Felix and Steinbuch, Dirk and Walter, Thomas and Weigel, Robert},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060177},
    year = {2015},
    month = {09},
    day = {28},
    eventdate = {2015-09-28/2015-09-30},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Modellierung und Simulation von Einschwingvorgängen bei Automobilradaren mit Chirp-Sequence-Modulation},
    type = {Abstract zum Vortrag},
    venue = {Miltenberg},
    }
  • [DOI] J. Röber, C. Zwick, A. Bänisch, S. Dirauf, G. Roppenecker, R. Weigel, and S. Dirauf, "Novel Control Methods for Phase Lock Loops" in European conference on circuit theory and design (ECCTD), Trondheim, 2015. [Bibtex]
    @inproceedings{roeber2015a,
    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.},
    author = {Röber, Jürgen and Zwick, Christian and Bänisch, Andreas and Dirauf, Simon and Roppenecker, Günter and Weigel, Robert and Dirauf, Simon},
    publisher = {IEEE},
    booktitle = {European conference on circuit theory and design (ECCTD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060190},
    year = {2015},
    month = {08},
    doi = {10.1109/ECCTD.2015.7300091},
    eventtitle = {European conference on circuit theory and design (ECCTD)},
    faupublication = {yes},
    keywords = {PLL; Phase Lock Loop; Synthesizer; Control Theory; Behavioral Modeling},
    peerreviewed = {Yes},
    title = {Novel Control Methods for Phase Lock Loops},
    venue = {Trondheim},
    }
  • [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 (NEMO), Ottawa, Canada, 2015, pp. 1-4. [Bibtex]
    @inproceedings{talai2015b,
    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.},
    author = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Schwanke, Dieter and Rittweg, Thomas and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060223},
    year = {2015},
    month = {08},
    day = {11},
    doi = {10.1109/NEMO.2015.7415066},
    eventdate = {2015-08-11/2015-08-14},
    faupublication = {yes},
    keywords = {Dielectric Loss; Differential Amplitude; Embedded Cavity; LTCC; Material Characterization},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Embedded Cavity based Dielectric Loss Measurements for LTCC Substrates up to 110 GHz},
    venue = {Ottawa, Canada},
    }
  • [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), Trondheim, 2015, pp. 1-4. [Bibtex]
    @inproceedings{soell2015a,
    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.},
    author = {Söll, Christopher and Shi, Lan and Bänisch, Andreas and Röber, Jürgen and Ußmüller, Thomas and Weigel, Robert},
    booktitle = {IEEE European conference on circuit theory and design (ECCTD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060226},
    year = {2015},
    month = {08},
    doi = {10.1109/ECCTD.2015.7300039},
    faupublication = {yes},
    keywords = {analog computation; analog carry; pseudo-digital carry; pre-processing; GRK-1773},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Analog Computation Methods with the help of analog and pseudo-digital Carry Signals},
    venue = {Trondheim},
    }
  • [DOI] D. Kissinger, J. Nehring, A. Bauch, K. Borutta, I. Nasr, B. Lämmle, and R. Weigel, "Integrated Test Concepts for In-Situ Millimeter-Wave Device Characterization" in IEEE 13th International New Circuits and Systems Conference (NEWCAS), Grenoble, France, 2015, pp. 1-4. [Bibtex]
    @inproceedings{kissinger2015b,
    author = {Kissinger, Dietmar and Nehring, Johannes and Bauch, Andreas and Borutta, Karl and Nasr, Ismail and Lämmle, Benjamin and Weigel, Robert},
    booktitle = {IEEE 13th International New Circuits and Systems Conference (NEWCAS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060164},
    year = {2015},
    month = {07},
    day = {07},
    doi = {10.1109/NEWCAS.2015.7181980},
    eventdate = {2015-06-07/2015-08-10},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Integrated Test Concepts for In-Situ Millimeter-Wave Device Characterization},
    venue = {Grenoble, France},
    }
  • [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), Glasgow, 2015, pp. 220-223. [Bibtex]
    @inproceedings{soell2015,
    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.},
    author = {Söll, Christopher and Bänisch, Andreas and Röber, Jürgen and Shi, Lan and Weigel, Robert},
    booktitle = {IEEE Conference on PhD Research in Microelectronics and Electronics (PRIME)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060169},
    year = {2015},
    month = {06},
    doi = {10.1109/PRIME.2015.7251374},
    faupublication = {yes},
    keywords = {bandgap; reference; low power; high psrr; temperature coefficient; subregulation; GRK-1773},
    pages = {220--223},
    peerreviewed = {Yes},
    title = {A Multi-Functional Reconfigurable Low-Power Ultra-High PSRR CMOS Reference-System},
    venue = {Glasgow},
    }
  • [DOI] F. Xie, R. Weiß, and R. Weigel, "Giant-Magnetoresistance-Based Galvanically Isolated Voltage and Current Measurements", IEEE Transactions on Instrumentation and Measurement, vol. 64, iss. 8, pp. 2048-2054, 2015. [Bibtex]
    @article{xie2015,
    author = {Xie, Fei and Weiß, Roland and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060183},
    year = {2015},
    month = {06},
    day = {22},
    doi = {10.1109/TIM.2015.2440553},
    faupublication = {yes},
    issn = {0018-9456},
    journaltitle = {IEEE Transactions on Instrumentation and Measurement},
    number = {8},
    pages = {2048--2054},
    peerreviewed = {Yes},
    shortjournal = {IEEE T INSTRUM MEAS},
    title = {Giant-Magnetoresistance-Based Galvanically Isolated Voltage and Current Measurements},
    volume = {64},
    }
  • [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,
    abstract = {A new semi-physical memoryless computationally effective behavioral model (BM) capable of predicting amplitude-modulation-to-amplitude-modulation (AM-AM) and amplitude-modulation-to-phase-modulation (AM-PM) distortions is proposed. In recent years, AM-AM and AM-PM distortions have been separately studied in literature. Here, we investigate the correlation between AM-AM and AM-PM distortions first. Based on the observed correlation, a novel AM-PM model is derived from the well-known Rapp AM-AM model. On the basis of the close relationship between the AM-AM and AM-PM model, a highly accurate and computationally effective large-signal BM is obtained. The newly developed model addresses the current needs of the mobile industry that requires BMs of the power amplifier (PA), which can be interpreted by the designers. In addition, the models must be computationally effective due to the limited computation power in mobile handset. Therefore, only memoryless BMs can be taken into account and larger errors are accepted for the sake of computational effectiveness. In this paper, it is shown that the newly introduced model achieves excellent results, when it is applied to actual industrial applications of two GaAs-based class-AB PAs in 65-nm technology and one CMOS-based class AB PA in 28-nm technology, which are designed for mobile communications.},
    author = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060156},
    year = {2015},
    month = {06},
    doi = {10.1109/TMTT.2015.2418751},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {6},
    pages = {1826--1835},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A Memoryless Semi-Physical Power Amplifier Behavioral Model Based on the Correlation Between AM-AM and AM-PM Distortions},
    volume = {63},
    }
  • [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), Lisabon, 2015. [Bibtex]
    @inproceedings{roeber2015,
    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.},
    author = {Röber, Jürgen and Bänisch, Andreas and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE International Symposium on Circuits and Systems (ISCAS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060207},
    year = {2015},
    month = {05},
    doi = {10.1109/ISCAS.2015.7169187},
    eventtitle = {IEEE International Symposium on Circuits and Systems (ISCAS)},
    faupublication = {yes},
    keywords = {LNA; low noise; high gain; differential; distortion canceller; CCPDC},
    peerreviewed = {Yes},
    title = {A Low Noise Amplifier Chain for Digital Satellite Radio Applications},
    venue = {Lisabon},
    }
  • [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, Phoenix, USA, 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},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060162},
    year = {2015},
    month = {05},
    day = {17},
    doi = {10.1109/MWSYM.2015.7166954},
    eventdate = {2015-05-17/2015-05-22},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Polyharmonic Distortion Modeling of RF BAW Components},
    venue = {Phoenix, USA},
    }
  • [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 IEEE MTT-S International Microwave Symposium (IMS), Phoenix, CA, USA, 2015, pp. 1-4. [Bibtex]
    @inproceedings{talai2015a,
    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.},
    author = {Talai, Armin and Mann, Sebastian and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Microwave Symposium (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060224},
    year = {2015},
    month = {05},
    day = {17},
    doi = {10.1109/MWSYM.2015.7166937},
    eventdate = {2015-05-17/2015-05-22},
    faupublication = {yes},
    keywords = {Material Characterization; Phase Measurement; Ridged Waveguide; Relative Permittivity},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A Semi Double-Ridged quasi TE-Waveguide based Microwave Bulk Material Characterization System},
    venue = {Phoenix, CA, USA},
    }
  • [DOI] G. A. Guarin Aristizabal, 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 Aristizabal, Gustavo Adolfo and Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060199},
    year = {2015},
    month = {05},
    doi = {10.1109/MMM.2015.2394024},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {4},
    pages = {71--86},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Miniature Microwave Biosensors: Noninvasive Applications},
    volume = {16},
    }
  • [DOI] M. Richter, A. Koelpin, T. Bosselman, and R. Weigel, "Electrical Fiber Optical Sensor for High-Voltage Applications" in Proceedings SENSOR 2015, Nürnberg, 2015, pp. 804-806. [Bibtex]
    @inproceedings{richter2015,
    abstract = {Controlling the energy transfer in high voltage grids implies using sophisticated instrumentation, which has to ensure effective insulation for 150kV to 800kV. Several solutions were previously proposed to facilitate power supply for instrumentation operating at this potential. Most of them exploit the energy dissipated by alternating current grids, which is not possible for the recently emerging direct current grids. There, no alternating electric or alternating magnetic fields are available such that power supply by fiber optical power transmission is a commonly chosen solution. However, most of these systems involve high power laser diodes that lead to a considerable amount of problems and risks. In this paper, an electrical circuit design is proposed that reduces the amount of required energy such that alternative optical power sources can be used. It has been shown that an electrical circuit can measure a temperature and transmit the results, while it is supplied with less than 180µW of power through the fiber used for data transmission. The energy necessary for measurement and transmission of a single temperature value could be reduced to 15µJ. A combination of selected components, energy saving optimized design and programming was used to cut down the energy demands such that light emitting diodes coupled to a standard multi mode fiber are sufficient for power supply.},
    author = {Richter, Markus and Koelpin, Alexander and Bosselman, Thomas and Weigel, Robert},
    booktitle = {Proceedings SENSOR 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060191},
    year = {2015},
    month = {05},
    day = {19},
    doi = {10.5162/SENSOR2015/P5.3},
    eventdate = {2015-05-19/2015-05-21},
    eventtitle = {Sensor+Test},
    faupublication = {yes},
    isbn = {9783981348484},
    pages = {804--806},
    peerreviewed = {unknown},
    title = {Electrical Fiber Optical Sensor for High-Voltage Applications},
    venue = {Nürnberg},
    }
  • [DOI] W. Akstaller, A. Tag, C. Musolff, R. Weigel, and A. Hagelauer, "Measurement Setup for X-Parameter Characterization of Bulk Acoustic Wave Resonators" in 85th Microwave Measurement Conference (ARFTG), Phoenix, AZ, USA, 2015, pp. 1-3. [Bibtex]
    @inproceedings{akstaller2015,
    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.},
    author = {Akstaller, Wolfgang and Tag, Andreas and Musolff, Christian and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {85th Microwave Measurement Conference (ARFTG)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060217},
    year = {2015},
    month = {05},
    day = {22},
    doi = {10.1109/ARFTG.2015.7162919},
    eventdate = {2015-05-22/2015-05-22},
    faupublication = {yes},
    keywords = {X-Parameter; BAW},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Measurement Setup for X-Parameter Characterization of Bulk Acoustic Wave Resonators},
    venue = {Phoenix, AZ, USA},
    }
  • A. Koelpin, F. Lurz, and R. Weigel, "Introduction in High-Resolution and Ultra-Low Power Distance Measurements by Microwave Interferometry" in International Microwave Symposium, Phoenix, Arizona, USA, 2015. [Bibtex]
    @inproceedings{koelpin2015,
    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.},
    author = {Koelpin, Alexander and Lurz, Fabian and Weigel, Robert},
    language = {English},
    booktitle = {International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060220},
    year = {2015},
    month = {05},
    day = {17},
    eventdate = {2015-05-17/2015-05-22},
    faupublication = {yes},
    keywords = {Radar; Interferometry},
    peerreviewed = {unknown},
    title = {Introduction in High-Resolution and Ultra-Low Power Distance Measurements by Microwave Interferometry},
    venue = {Phoenix, Arizona, USA},
    }
  • [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, Phoenix, AZ, 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},
    booktitle = {IEEE MTT-S International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060163},
    year = {2015},
    month = {05},
    doi = {10.1109/MWSYM.2015.7166712},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {No},
    title = {Integrated millimeter-wave transceiver concepts and technologies for wireless multi-Gbps communication},
    type = {Konferenzschrift},
    venue = {Phoenix, AZ},
    }
  • [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" in IEEE International Microwave Symposium, Phoenix, AZ, USA, 2015. [Bibtex]
    @inproceedings{linz2015a,
    abstract = {This work introduces a precise measurement setup for displacement analysis in the near field of a tapered slot-line antenna from 0mm up to 20mm distance. Enhanced accuracy is achieved by a dedicated spiral reconstruction algorithm accounting for the near field effects. Moreover, the precision of the system in the micrometer range is guaranteed by four synchronous 24 bit analog-to-digital converters and a decimation factor of 10, leading to an overall update rate of 1 kHz.},
    author = {Linz, Sarah and Lurz, Fabian and Sporer, Michael and Lindner, Stefan and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060233},
    year = {2015},
    month = {05},
    day = {17},
    doi = {10.1109/MWSYM.2015.7167116},
    eventdate = {2015-05-17/2015-05-22},
    faupublication = {yes},
    isbn = {9781479982752},
    issn = {0149-645X},
    peerreviewed = {Yes},
    title = {Ultra-Short-Range Precise Displacement Measurement Setup with a Near Field Slot-Line Antenna and a Dedicated Spiral Calibration},
    venue = {Phoenix, AZ, USA},
    }
  • [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), Monterey, CA, USA, 2015, p. XT4.1--XT4.4. [Bibtex]
    @inproceedings{cattaneo2015,
    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.},
    author = {Cattaneo, Andrea and Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE International Reliability Physics Symposium (IRPS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060228},
    year = {2015},
    month = {04},
    day = {19},
    doi = {10.1109/IRPS.2015.7112835},
    eventdate = {2015-04-19/2015-04-23},
    faupublication = {yes},
    pages = {XT4.1--XT4.4},
    peerreviewed = {unknown},
    title = {Impact of DC and RF non-conducting stress on nMOS reliability},
    venue = {Monterey, CA, USA},
    }
  • [DOI] S. Mueller, 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 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), Lisbon, Portugal, 2015, pp. 1-8. [Bibtex]
    @inproceedings{mueller2015a,
    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.},
    author = {Mueller, Steffen and Dennerlein, Jürgen and Janke, Iryna and Weber, Johannes and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060179},
    year = {2015},
    month = {04},
    doi = {10.1109/ANIMMA.2015.7465532},
    faupublication = {yes},
    keywords = {Power Line Communication; PLC; radiation hard electronics; radhard; sensor networks; online monitoring; OLM; monitoring and diagnostics; M&D},
    pages = {1--8},
    peerreviewed = {No},
    title = {In-Containment Signal Conditioning and Transmission via Power Lines within High Dose Rate Areas of Nuclear Power Plants},
    type = {Konferenzschrift},
    venue = {Lisbon, Portugal},
    }
  • [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 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), Heidelberg, 2015, pp. 1-4. [Bibtex]
    @inproceedings{lutz2015,
    abstract = {In this contribution a novel concept for a lens based 8 channel MIMO radar is presented. Hereby the sensor concept deals with a combination of optical beamforming based on a dielectric lens and the classical MIMO radar approach to increase the angular resolution. The sensor architecture is presented, the antenna concept introduced and characterized by measurements. After a brief formulation of the signal model, the evaluation of the angular performance based on the Cramer-Rao lower bound is introduced. The paper concludes with the comparison between MIMO and MISO radar processing in real world multiple target scenarios.},
    author = {Lutz, Steffen and Erhart, Christian and Walter, Thomas and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060197},
    year = {2015},
    month = {04},
    day = {27},
    doi = {10.1109/ICMIM.2015.7117955},
    eventdate = {2015-04-27/2015-04-29},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {8 Channel MIMO Long Range Radar Concept for Angular Estimation in Multi Target Scenarios},
    venue = {Heidelberg},
    }
  • [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, vol. 7, iss. 3-4, 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},
    publisher = {Cambridge University Press},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060218},
    year = {2015},
    month = {03},
    doi = {10.1017/S1759078715000483},
    faupublication = {yes},
    issn = {1759-0787},
    journaltitle = {International Journal of Microwave and Wireless Technologies},
    number = {3-4},
    pages = {251--260},
    peerreviewed = {Yes},
    title = {A Method for the Determination of the Complex Permittivity by Detuned Ring Resonators for Bulk Materials up to 110 GHz},
    volume = {7},
    }
  • M. Hierold, C. Hsieh, R. Weigel, and A. Koelpin, "Miniaturized sensor nodes with mutual detection and localization capability" in German Microwave Conference (GeMic), Nürnberg, 2015. [Bibtex]
    @inproceedings{hierold2015b,
    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.},
    author = {Hierold, Martin and Hsieh, Chia-Yu and Weigel, Robert and Koelpin, Alexander},
    booktitle = {German Microwave Conference (GeMic)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060165},
    year = {2015},
    month = {03},
    faupublication = {yes},
    keywords = {wireless sensor network; low power},
    peerreviewed = {No},
    title = {Miniaturized sensor nodes with mutual detection and localization capability},
    venue = {Nürnberg},
    }
  • [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, Nürnberg, 2015, pp. 402-405. [Bibtex]
    @inproceedings{tag2015,
    abstract = {A new, accurate, and fast approach for determining the temperature coefficients of the thin film materials used in RF BAW components has been developed allowing the precise modeling of BAW components at different ambient temperatures. The presented method is based on the investigation of several resonance frequencies of the resonators with different layer-stacks. The problem of determining the temperature coefficients from broadband resonator simulations and measurements was formulated as an overdetermined linear system of equations and solved by using the weighted least square method. The presented approach has been verified by measurements.},
    author = {Tag, Andreas and Bader, Bernhard and Pitschi, Maximilian and Wagner, Karl Christian and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060211},
    year = {2015},
    month = {03},
    day = {16},
    doi = {10.1109/GEMIC.2015.7107838},
    eventdate = {2015-03-16/2015-03-18},
    eventtitle = {German Microwave Conference (GeMiC)},
    faupublication = {yes},
    pages = {402--405},
    peerreviewed = {Yes},
    title = {Determination of Temperature Coefficients of Materials in RF BAW Resonators},
    venue = {Nürnberg},
    }
  • [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, Nürnberg, 2015, pp. 343-346. [Bibtex]
    @inproceedings{kastenhuber2015,
    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.},
    author = {Kastenhuber, Tina and Röber, Jürgen and Bänisch, Andreas and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060234},
    year = {2015},
    month = {03},
    doi = {10.1109/GEMIC.2015.7107823||10.1109/GEMIC.2015.7107823},
    eventtitle = {German Microwave Conference},
    faupublication = {yes},
    keywords = {Phase shifter; vector modulated; PGA; constant gm-source; low-power; diversity},
    pages = {343--346},
    peerreviewed = {Yes},
    title = {A Miniaturized Very Low-Power Vector Modulated CMOS Phase Shifter for Wireless Receivers},
    venue = {Nürnberg},
    }
  • 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 DATE Friday Workshop on Heterogeneous Architectures and Design Methods for Embedded Image Systems, 2015. [Bibtex]
    @inproceedings{shi2015a,
    author = {Shi, Lan and Söll, Christopher and Bänisch, Andreas and Weigel, Robert and Seiler, Jürgen and Ußmüller, Thomas},
    booktitle = {DATE Friday Workshop on Heterogeneous Architectures and Design Methods for Embedded Image Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1053753},
    year = {2015},
    month = {03},
    day = {13},
    eventdate = {2015-03-13/2015-03-13},
    eventtitle = {Friday Workshop on Heterogeneous Architectures and Design Methods for Embedded Image Systems},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Concept for a CMOS Image Sensor Suited for Analog Image Pre-Processing},
    }
  • [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 (GeMiC), Nürnberg, 2015, pp. 252-255. [Bibtex]
    @inproceedings{erhart2015,
    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.},
    author = {Erhart, Christian and Lutz, Steffen and Mantz, Hubert and Walter, Thomas and Weigel, Robert},
    booktitle = {German Microwave Conference (GeMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060187},
    year = {2015},
    month = {03},
    day = {16},
    doi = {10.1109/GEMIC.2015.7107801},
    eventdate = {2015-03-16/2015-03-18},
    faupublication = {yes},
    pages = {252--255},
    peerreviewed = {Yes},
    title = {A highly modular 77 GHz multi-tone FMCW SiGe radar concept for industrial measurements},
    venue = {Nürnberg},
    }
  • [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,
    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.},
    author = {Mann, Sebastian and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060181},
    year = {2015},
    month = {03},
    doi = {10.1109/MMM.2014.2367860},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {Low Power; Radar},
    number = {2},
    pages = {99--105},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {A High-Sensitivity Radar System Featuring Low Weight and Power Consumption},
    volume = {16},
    }
  • [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), Nuremberg, Germany, 2015, pp. 217-220. [Bibtex]
    @inproceedings{mueller2015,
    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.},
    author = {Müller, Felix and Steinbuch, Dirk and Walter, Thomas and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMiC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060192},
    year = {2015},
    month = {03},
    day = {16},
    doi = {10.1109/GEMIC.2015.7107792},
    eventdate = {2015-03-16/2015-03-18},
    faupublication = {yes},
    pages = {217--220},
    peerreviewed = {Yes},
    title = {A method for the analysis of ramp-inherent linearity distortions in automotive radar applications},
    venue = {Nuremberg, Germany},
    }
  • [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), Nuremberg, Germany, 2015, pp. 382-385. [Bibtex]
    @inproceedings{hierold2015a,
    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.},
    author = {Hierold, Martin and Ripperger, Simon and Mayer, Frieder and Weigel, Robert and Koelpin, Alexander},
    booktitle = {German Microwave Conference 2015 (Gemic)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060166},
    year = {2015},
    month = {03},
    day = {16},
    doi = {10.1109/GEMIC.2015.7107833},
    eventdate = {2015-03-16/2015-03-18},
    faupublication = {yes},
    keywords = {wireless sensor network; low power},
    pages = {382--385},
    peerreviewed = {Yes},
    title = {System Design for Encounter Detection of Distributed Wireless Sensors},
    venue = {Nuremberg, Germany},
    }
  • [DOI] G. A. Guarin Aristizabal, M. Gardill, R. Weigel, G. Fischer, and D. Kissinger, "Ultra-wideband compressed sensing radar based on pseudo-random binary sequences" in German Microwave Conference, Nuremberg, Germany, 2015, pp. 233-236. [Bibtex]
    @inproceedings{guarin2015,
    author = {Guarin Aristizabal, Gustavo Adolfo and Gardill, Markus and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060195},
    year = {2015},
    month = {03},
    doi = {10.1109/GEMIC.2015.7107796},
    faupublication = {yes},
    pages = {233--236},
    peerreviewed = {Yes},
    title = {Ultra-wideband compressed sensing radar based on pseudo-random binary sequences},
    venue = {Nuremberg, Germany},
    }
  • [DOI] S. Lindner, F. Barbon, S. Linz, S. Mann, R. Weigel, and A. Koelpin, "Distance measurements and limitations based on guided wave 24 GHz 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,
    abstract = {In the following, a continuous wave 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. The system will be presented with measurement results at 24 GHz within a WR42 waveguide to prove the feasibility of the proposed concept. Furthermore, considerations on timing will show the potential as a low-latency system, capable of high measurement data update rates, and different influences on the system performance and limitations of such a system will be discussed in comparison to alternative setups.},
    author = {Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {Cambridge University Press},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060201},
    year = {2015},
    month = {02},
    doi = {10.1017/S1759078715000239},
    faupublication = {yes},
    issn = {1759-0795},
    journaltitle = {International Journal of Microwave and Wireless Technologies},
    number = {Special Issue 3-4},
    pages = {425--432},
    peerreviewed = {Yes},
    title = {Distance measurements and limitations based on guided wave 24 GHz dual tone Six-port radar},
    volume = {7},
    }
  • [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, San Diego, CA, 2015, pp. 11-13. [Bibtex]
    @inproceedings{hierold2015,
    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.},
    author = {Hierold, Martin and Ripperger, Simon and Josic, Darija and Mayer, Frieder and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Meeting on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060225},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127416},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    keywords = {energy efficiency; wireless sensor network},
    pages = {11--13},
    peerreviewed = {Yes},
    title = {Low-Weight Wireless Sensor Network for Encounter Detection of Bats},
    venue = {San Diego, CA},
    }
  • [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 (WiSNet), San Diego, CA, USA, 2015, pp. 29-31. [Bibtex]
    @inproceedings{lindner2015,
    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.},
    author = {Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Lurz, Fabian and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060219},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127396},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    keywords = {distance measurement; low-cost; radar; six-port; synchronous sampling; adc},
    pages = {29--31},
    peerreviewed = {Yes},
    title = {ADC Depending Limitations for Six-Port Based Distance Measurement Systems},
    venue = {San Diego, CA, USA},
    }
  • [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), San Diego, CA, USA, 2015, pp. 72-74. [Bibtex]
    @inproceedings{sporer2015,
    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).},
    author = {Sporer, Michael and Lurz, Fabian and Schlücker, Eberhard and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060186},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127405},
    eventdate = {2015-08-25/2015-08-28},
    faupublication = {yes},
    keywords = {underwater distance sensor; interferometer},
    pages = {72--74},
    peerreviewed = {Yes},
    title = {Underwater Interferometric Radar Sensor for Distance and Vibration Measurement},
    venue = {San Diego, CA, USA},
    }
  • [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, San Diego, CA, 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},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060167},
    year = {2015},
    month = {01},
    doi = {10.1109/WISNET.2015.7127397},
    faupublication = {yes},
    pages = {7--10},
    peerreviewed = {Yes},
    title = {Wireless integrated sensor nodes for indoor monitoring and localization (invited)},
    venue = {San Diego, CA},
    }
  • [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), San Diego, CA, USA, 2015, pp. 1-3. [Bibtex]
    @inproceedings{fuhrmann2015,
    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.},
    author = {Fuhrmann, Jörg and Obmann, Patrick and Dufrene, Krzysztof and Pretl, Harald and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060213},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/PAWR.2015.7139205},
    eventdate = {2015-01-25/2015-01-28},
    eventtitle = {IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A 28 nm standard CMOS watt-level power amplifier for LTE applications},
    venue = {San Diego, CA, USA},
    }
  • [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, San Diego, CA, USA, 2015, pp. 1-3. [Bibtex]
    @inproceedings{nehring2015,
    author = {Nehring, Johannes and Bartels, Melanie and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Topical Conference on Biomedical Wireless Technologies, Networks & Sensing Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060209},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/BIOWIRELESS.2015.7152114},
    eventdate = {2015-01-25/2015-01-28},
    eventtitle = {IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A Permittivity Sensitive Phase-Locked Loop Based on a Silicon-Integrated Capacitive Sensor for Microwave Biosensing Applications},
    venue = {San Diego, CA, USA},
    }
  • [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), San Diego, CA, USA, 2015, pp. 111-113. [Bibtex]
    @inproceedings{lurz2015,
    abstract = {This paper presents a low power 24GHz Doppler radar system for presence detection and occupancy monitoring. It is based on a minimalistic hardware approach 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. 0.2mW 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.},
    author = {Lurz, Fabian and Mann, Sebastian and Linz, Sarah and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Radio and Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060677},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/RWS.2015.7129719},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    journaltitle = {IEEE Radio and Wireless Symposium, RWS},
    keywords = {Doppler radar; low-power; occupancy sensor},
    pages = {111--113},
    peerreviewed = {Yes},
    title = {A Low Power 24 GHz Radar System for Occupancy Monitoring},
    type = {undefined},
    venue = {San Diego, CA, USA},
    }
  • [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 IEEE Topical Conference on Wireless Sensors and Sensor Networks, San Diego, USA, 2015, pp. 20-22. [Bibtex]
    @inproceedings{linz2015,
    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.},
    author = {Linz, Sarah and Oesterle, Florian and Talai, Armin and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060176},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127403},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    keywords = {MEMS; Six-Port; Microwave Interferometer; W-band; Contactless Testing; Pull-in; Mechanical Sensitivity},
    pages = {20--22},
    peerreviewed = {Yes},
    title = {100 GHz Reflectometer for Sensitivity Analysis of MEMS Sensors Comprising an Intermediate Frequency Six-port Receiver},
    venue = {San Diego, USA},
    }
  • [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), San Diego, CA, USA, 2015, pp. 44-46. [Bibtex]
    @inproceedings{mann2015,
    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.},
    author = {Mann, Sebastian and Erhardt, Stefan and Lindner, Stefan and Lurz, Fabian and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060215},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127415},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    keywords = {Detector; interferometer,; millimeter-wave; Six-Port; RADAR; phase measurement},
    pages = {44--46},
    peerreviewed = {Yes},
    title = {Diode Detector Design for 61 GHz Substrate Integrated Waveguide Six-Port Radar Systems},
    venue = {San Diego, CA, USA},
    }
  • 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},
    booktitle = {Positionspapier des VDE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060232},
    year = {2015},
    faupublication = {no},
    pages = {1--24},
    peerreviewed = {No},
    title = {Hidden Electronics},
    type = {Working Paper},
    url = {https://www.vde.com/de/fg/gmm/news/documents/vde_pp_hidden\%20electronics_rz_web.pdf},
    }
  • [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},
    booktitle = {SPIE Photonics West},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060206},
    year = {2015},
    doi = {10.1117/12.2210915},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Oxygen detection system consisting of a millimeter wave Fabry-Pérot resonator and an integrated SiGe front-end},
    }
  • F. Dressler, B. Blössl, 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 EEE International Conference on Communications (ICC 2015), 2015. [Bibtex]
    @inproceedings{dressler2015a,
    author = {Dressler, Falko and Blössl, Bastian and Hierold, Martin and Hsieh, Chia-Yu and Nowak, Thorsten and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {EEE International Conference on Communications (ICC 2015)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1043198},
    year = {2015},
    faupublication = {no},
    peerreviewed = {Yes},
    title = {Protocol Design for Ultra-Low Power Wake-Up Systems for Tracking Bats in the Wild},
    type = {Konferenzschrift},
    }

2014

  • [DOI] M. Hamouda, G. A. Guarin Aristizabal, 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, Mohamed and Guarin Aristizabal, Gustavo Adolfo and Gardill, Markus and Lämmle, Benjamin and Weigel, Robert and Kissinger, Dietmar and Ußmüller, Thomas},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060085},
    year = {2014},
    month = {12},
    doi = {10.1109/TMTT.2014.2364676},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {12},
    pages = {3549--3561},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A clock synchronization for M-sequence-based ultra-wideband systems},
    volume = {62},
    }
  • [DOI] S. Lutz, T. Walter, and R. Weigel, "Target Simulator concept for Chirp Modulated 77 GHz Automotive Radar Sensors" in European Radar Conference, Rome, Italy, 2014, pp. 65-68. [Bibtex]
    @inproceedings{lutz2014a,
    author = {Lutz, Steffen and Walter, Thomas and Weigel, Robert},
    booktitle = {European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060055},
    year = {2014},
    month = {10},
    day = {08},
    doi = {10.1109/EURAD.2014.6991208},
    eventdate = {2014-10-08/2014-10-10},
    faupublication = {yes},
    pages = {65--68},
    peerreviewed = {Yes},
    title = {Target Simulator concept for Chirp Modulated 77 GHz Automotive Radar Sensors},
    venue = {Rome, Italy},
    }
  • [DOI] E. Lourandakis, K. Karouzakis, P. Papadopoulos, J. A. Chicharro, and R. Weigel, "Integrated RF transformer and power combiner design in 150nm CMOS process" in European Microwave Integrated Circuit Conference (EuMIC), 2014 9th, Rom, Italy, 2014. [Bibtex]
    @inproceedings{lourandakis2014,
    author = {Lourandakis, Errikos and Karouzakis, Konstantinos and Papadopoulos, Padelis and Chicharro, José Antonio and Weigel, Robert},
    booktitle = {European Microwave Integrated Circuit Conference (EuMIC), 2014 9th},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057347},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMIC.2014.6997780},
    eventdate = {2014-10-06/2014-10-07},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Integrated RF transformer and power combiner design in 150nm CMOS process},
    type = {Konferenzschrift},
    venue = {Rom, Italy},
    }
  • [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), Rom, Italy, 2014, pp. 57-60. [Bibtex]
    @inproceedings{lindner2014,
    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.},
    author = {Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {11th European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060121},
    year = {2014},
    month = {10},
    day = {08},
    doi = {10.1109/EURAD.2014.6991206},
    eventdate = {2014-10-08/2014-10-10},
    faupublication = {yes},
    keywords = {distance measurement; interferometry; phase measurement; radar; Six-Port; Waveguide},
    pages = {57--60},
    peerreviewed = {Yes},
    title = {Distance Measurements Based on Guided Wave 24 GHz Dual Tone Six-Port Radar},
    venue = {Rom, Italy},
    }
  • [DOI] A. Bauch, 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, Rome, Italy, 2014, p. 4. [Bibtex]
    @inproceedings{oborovski2014,
    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.},
    author = {Bauch, Andreas and Hofmann, Maximilian and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {European Microwave Conference 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060071},
    year = {2014},
    month = {10},
    doi = {10.1109/EUMC.2014.6986373},
    faupublication = {yes},
    keywords = {Directional Coupler,Passive Microwave Circuits,Wideband},
    pages = {4},
    peerreviewed = {Yes},
    title = {Multi-Octave Planar Microwave Slot-Coupled Directional Coupler up to 28 GHz with Novel Phase Velocity Compensation},
    venue = {Rome, Italy},
    }
  • [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, Rom, Italy, 2014, pp. 746-749. [Bibtex]
    @inproceedings{linz2014b,
    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.},
    author = {Linz, Sarah and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Lurz, Fabian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060135},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMC.2014.6986542},
    eventdate = {2014-10-06/2014-10-09},
    faupublication = {yes},
    keywords = {Six-Port; Ellipse; IQ Imbalance; Interferometer},
    pages = {746--749},
    peerreviewed = {Yes},
    title = {I/Q Imbalance Compensation for Six-Port Interferometers in Radar Applications},
    venue = {Rom, Italy},
    }
  • [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, Germany, 2014. [Bibtex]
    @inproceedings{schwarzmeier2014a,
    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.},
    author = {Schwarzmeier, Andre and Roth, Nils and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {BMT 2014 - 48. Jahrestagung der DGBMT},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060072},
    year = {2014},
    month = {10},
    doi = {10.1515/BMT-2014-4100},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Fall Detection and Activity Monitoring Algorithm for a Tele-Care System Supporting Dementia and Alzheimer Patients},
    venue = {Germany},
    }
  • [DOI] J. Walk, J. Kolpak, 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,
    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.},
    author = {Walk, Jasmin and Kolpak, Jasmin and Söll, Christopher and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060053},
    year = {2014},
    month = {10},
    doi = {10.1109/JPROC.2014.2359517},
    faupublication = {yes},
    issn = {0018-9219},
    journaltitle = {Proceedings of the IEEE},
    keywords = {biological tissues; biomedical communication; biomedical power supplies; energy storage; frequency domain analysis; implantable biomedical devices; permittivity},
    number = {10},
    pages = {100--116},
    peerreviewed = {Yes},
    shortjournal = {P IEEE},
    title = {Remote powered medical implants for Telemonitoring (Invited Paper)},
    volume = {102},
    }
  • [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 44th European Microwave Conference (EuMC), Rom, Italy, 2014, pp. 124-127. [Bibtex]
    @inproceedings{talai2014f,
    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.},
    author = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {44th European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060127},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMC.2014.6986385},
    eventdate = {2014-10-06/2014-10-09},
    faupublication = {yes},
    keywords = {Bulk material; detuned resonator; frequency shift; material characterization; permittivity; ring resonator},
    pages = {124--127},
    peerreviewed = {Yes},
    title = {A Permittivity Characterization Method by Detuned Ring-Resonators for Bulk Materials up to 110 GHz},
    venue = {Rom, Italy},
    }
  • [DOI] M. Sporer, R. Weigel, and A. Koelpin, "Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage" in European Microwave Week, Rome, Italy, 2014, pp. 1683-1686. [Bibtex]
    @inproceedings{sporer2014a,
    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.},
    author = {Sporer, Michael and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Microwave Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060094},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMC.2014.6986779},
    eventdate = {2014-10-06/2014-10-09},
    eventtitle = {European Microwave Week},
    faupublication = {yes},
    pages = {1683--1686},
    peerreviewed = {Yes},
    title = {Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage},
    type = {Konferenzschrift},
    venue = {Rome, Italy},
    }
  • [DOI] M. Sporer, R. Weigel, and A. Koelpin, "Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage" in European Radar Conference, Rome, Italy, 2014, pp. 380-383. [Bibtex]
    @inproceedings{sporer2014,
    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.},
    author = {Sporer, Michael and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060080},
    year = {2014},
    month = {10},
    day = {08},
    doi = {10.1109/EURAD.2014.6991287},
    eventdate = {2014-10-08/2014-10-10},
    eventtitle = {European Radar Conference 2014},
    faupublication = {yes},
    pages = {380--383},
    peerreviewed = {Yes},
    title = {Open-Ended Dielectric-Filled Waveguide Antenna for Underwater Usage},
    type = {Konferenzschrift},
    venue = {Rome, Italy},
    }
  • [DOI] A. Radwan, A. Talai, R. Weigel, and D. Kissinger, "A 1.16 pJ/bit 80 Gb/s 2¹¹-1 PRBS generator in SiGe bipolar technology" in 9th European Microwave Integrated Circuit Conference (EuMIC), Rom, Italy, 2014, pp. 277-280. [Bibtex]
    @inproceedings{gharib2014b,
    abstract = {A 211-1, 80Gb/s pseudo-random bit sequence (PRBS) generator, employing parallel architecture is presented. The generator is optimized to provide a high bit rate as well as a long sequence length without any need of inductive peaking for a lower power consumption, compared to PRBS generators reported in literature. The PRBS generator consists of two parallel complementary rows of linear feedback shift registers (LFSR), operating up to 40Gb/s, where the generated PRBS from each are multiplexed to provide a bit-rate of double the clock frequency, reaching up to 80Gb/s. The clock distribution network was carefully optimized for a reduced amplitude and phase error to push the boundaries of the maximum achievable bit-rate. The PRBS generator is capable of generating bit-rates ranging from 10Gb/s up to 80Gb/s, with a power consumption of 576 mW to 1 W. The circuit is manufactured in an 0.35 µm SiGe-Bipolar technology with an ft of 200 GHz.},
    author = {Radwan, Ahmed and Talai, Armin and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {9th European Microwave Integrated Circuit Conference (EuMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060108},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMIC.2014.6997846},
    eventdate = {2014-10-06/2014-10-07},
    faupublication = {yes},
    isbn = {9782874870361},
    pages = {277--280},
    peerreviewed = {Yes},
    title = {A 1.16 pJ/bit 80 Gb/s 2¹¹-1 PRBS generator in SiGe bipolar technology},
    venue = {Rom, Italy},
    }
  • [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 European Microwave Conference, Rome, Italy, 2014, pp. 171-174. [Bibtex]
    @inproceedings{lurz2014,
    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).},
    author = {Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {EuMA},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060056},
    year = {2014},
    month = {10},
    day = {05},
    doi = {10.1109/EUMC.2014.6986397},
    eventdate = {2014-10-05/2014-10-10},
    faupublication = {yes},
    keywords = {Frequency measurement; Delay line; Six-Port},
    pages = {171--174},
    peerreviewed = {Yes},
    title = {A Low-Cost 2.4 GHz Frequency Measurement System for Microsecond Time Domain Pulses Based on Six-Port Technology},
    venue = {Rome, Italy},
    }
  • [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), South Lake Tahoe, USA, 2014, pp. 79-81. [Bibtex]
    @inproceedings{cattaneo2014a,
    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.},
    author = {Cattaneo, Andrea and Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {IEEE International Integrated Reliability Workshop Final Report (IIRW)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060100},
    year = {2014},
    month = {10},
    day = {12},
    doi = {10.1109/IIRW.2014.7049515},
    eventdate = {2014-10-12/2014-10-16},
    faupublication = {yes},
    pages = {79--81},
    peerreviewed = {Yes},
    title = {Frequency Response of Stress-Effects on CMOS Power Amplifiers},
    venue = {South Lake Tahoe, USA},
    }
  • [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 44th European Microwave Conference (EuMC), Rom, Italy, 2014, pp. 742-745. [Bibtex]
    @inproceedings{barbon2014a,
    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.},
    author = {Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Koelpin, Alexander and Weigel, Robert},
    publisher = {EUMA},
    booktitle = {44th European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060089},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMC.2014.6986541},
    eventdate = {2014-10-06/2014-10-09},
    faupublication = {yes},
    keywords = {Six-Port; Frequency estimation; long range; radar},
    pages = {742--745},
    peerreviewed = {Yes},
    title = {Extended Range Distance Measurements Based on Frequency and Power Compensated Six-Port Receiver},
    venue = {Rom, Italy},
    }
  • [DOI] A. Farabegoli, B. Sogl, J. Müller, and R. Weigel, "A Novel Crest Factor Reduction Technique using Memoryless Polynomials" in 44th European Microwave Conference (EuMC), Rom, Italy, 2014, pp. 825-828. [Bibtex]
    @inproceedings{farabegoli2014,
    author = {Farabegoli, Alessio and Sogl, Bernhard and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {44th European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060098},
    year = {2014},
    month = {10},
    day = {06},
    doi = {10.1109/EUMC.2014.6986562},
    eventdate = {2014-10-06/2014-10-09},
    faupublication = {yes},
    pages = {825--828},
    peerreviewed = {Yes},
    title = {A Novel Crest Factor Reduction Technique using Memoryless Polynomials},
    venue = {Rom, Italy},
    }
  • [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,
    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.},
    author = {Nasr, Ismail and Knapp, Herbert and Aufinger, Klaus and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060133},
    year = {2014},
    month = {09},
    doi = {10.1109/TMTT.2014.2337289},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {9},
    pages = {2118--2131},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A 50-100-GHz Highly Integrated Octave-Bandwidth Transmitter and Receiver Chipset in 0.35um SiGe Technology},
    volume = {62},
    }
  • [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), Venice, Italy, 2014, pp. 230-233. [Bibtex]
    @inproceedings{cattaneo2014,
    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.},
    author = {Cattaneo, Andrea and Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {44th European Solid State Device Research Conference (ESSDERC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060131},
    year = {2014},
    month = {09},
    day = {22},
    doi = {10.1109/ESSDERC.2014.6948802},
    eventdate = {2014-09-22/2014-09-26},
    faupublication = {yes},
    pages = {230--233},
    peerreviewed = {Yes},
    title = {MOSFET degradation under DC and RF Fowler-Nordheim stress},
    venue = {Venice, Italy},
    }
  • [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,
    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.},
    author = {Franchi, Norman and Kloc, Matej and Weigel, Robert},
    language = {English},
    publisher = {IEEE},
    booktitle = {6th IEEE International Symposium on Wireless Vehicular Communications (WiVeC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060078},
    year = {2014},
    month = {09},
    doi = {10.1109/WIVEC.2014.6953259},
    eventtitle = {6th IEEE International Symposium on Wireless Vehicular Communications (WiVeC)},
    faupublication = {yes},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {SDR-Proved Adaptive OFDM Guard Interval Scheme for Rapidly Varying Time-Dispersive Vehicular Broadcast Channels},
    }
  • [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), Rhine River, Germany, 2014, pp. 1-5. [Bibtex]
    @inproceedings{brendel2014a,
    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.},
    author = {Brendel, Johannes and Rieß, Steffen and Schröter, Simon and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE International Workshop on Cognitive Cellular Systems (CCS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060066},
    year = {2014},
    month = {09},
    day = {02},
    doi = {10.1109/CCS.2014.6933788},
    eventdate = {2014-09-02/2014-09-04},
    faupublication = {yes},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {Signal detection and cooperative sensing with sensor nodes with limited dynamic},
    venue = {Rhine River, Germany},
    }
  • [DOI] T. Ußmüller, A. Hagelauer, and R. Weigel, Technologies for RFID sensors and sensor tags, Cambridge University Press, 2014.. [Bibtex]
    @book{ussmueller2014,
    author = {Ußmüller, Thomas and Hagelauer, Amelie and Weigel, Robert},
    publisher = {Cambridge University Press},
    booktitle = {Green RFID Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060082},
    year = {2014},
    month = {09},
    doi = {10.1017/CBO9781139343459.005},
    faupublication = {yes},
    isbn = {9781107030404},
    peerreviewed = {No},
    title = {Technologies for RFID sensors and sensor tags},
    type = {Band aus einer Reihe},
    }
  • [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, Chicago, Illinois, USA, 2014, pp. 2627-2630. [Bibtex]
    @inproceedings{tag2014b,
    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.},
    author = {Tag, Andreas and Karolewski, Dominik and Bader, Bernhard and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {2014 IEEE International Ultrasonics Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060059},
    year = {2014},
    month = {09},
    day = {03},
    doi = {10.1109/ULTSYM.2014.0656},
    eventdate = {2014-09-03/2014-09-06},
    faupublication = {yes},
    pages = {2627--2630},
    peerreviewed = {Yes},
    title = {Influence of Dissipated Power Distribution on BAW Resonators},
    venue = {Chicago, Illinois, USA},
    }
  • [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 44th European Microwave Conference, Rom, Italy, 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},
    booktitle = {44th European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060101},
    year = {2014},
    month = {09},
    day = {06},
    doi = {10.1109/EUMC.2014.6986506},
    eventdate = {2014-09-06/2014-10-09},
    faupublication = {yes},
    pages = {604--607},
    peerreviewed = {Yes},
    title = {Challenges in RF-DPLL Design for Wideband Phase Modulation supporting SC-FDMA in LTE Uplink},
    venue = {Rom, Italy},
    }
  • [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,
    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.},
    author = {Nasr, Ismail and Nehring, Johannes and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060111},
    year = {2014},
    month = {09},
    doi = {10.1109/TMTT.2014.2337264},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {9},
    pages = {2168--2179},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Single- and Dual-Port 50-100-GHz Integrated Vector Network Analyzers With On-Chip Dielectric Sensors},
    volume = {62},
    }
  • 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), Lissabon, Portugal, 2014, pp. 969-973. [Bibtex]
    @inproceedings{gardill2014a,
    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.},
    author = {Gardill, Markus and Kay, D. and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Signal Processing Conference (EUSIPCO)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060129},
    year = {2014},
    month = {09},
    day = {01},
    eventdate = {2014-09-01/2014-09-05},
    faupublication = {yes},
    pages = {969--973},
    peerreviewed = {Yes},
    title = {Numerical Investigations on the Quasi-Stationary Response of Antennas to Wideband LFMCW Excitation},
    venue = {Lissabon, Portugal},
    }
  • [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 (APWC), Palm Beach, Aruba, 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},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060134},
    year = {2014},
    month = {08},
    doi = {10.1109/APWC.2014.6905552},
    eventtitle = {2014 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    faupublication = {yes},
    isbn = {9781467356923},
    pages = {300--303},
    peerreviewed = {Yes},
    title = {Evaluation of the Impact of Antenna Parameters on the Performance of Six-Port Radar},
    venue = {Palm Beach, Aruba},
    }
  • [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,
    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.},
    author = {Gabiger-Rose, Anna and Kube, Matthias and Weigel, Robert and Rose, Richard},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060130},
    year = {2014},
    month = {08},
    doi = {10.1109/TIE.2013.2284133},
    faupublication = {yes},
    issn = {0278-0046},
    journaltitle = {IEEE Transactions on Industrial Electronics},
    keywords = {Bilateral filter; field-programmable gate array (FPGA)},
    number = {8},
    pages = {4093--4104},
    peerreviewed = {Yes},
    shortjournal = {IEEE T IND ELECTRON},
    title = {An FPGA-Based Fully Synchronized Design of a Bilateral Filter for Real-Time Image Denoising},
    volume = {61},
    }
  • [DOI] A. Talai, B. Gmeiner, C. M. Wegener, A. Roosen, A. Koelpin, F. Steinhäußer, U. Deisinger, A. Bittner, U. Schmid, and R. Weigel, "Electromagnetic analysis of conductor track surface roughnesses from 1 GHz to 110 GHz" in Proceedings - 2014 International Conference on Electromagnetics in Advanced Applications, ICEAA 2014, Palm Beach, Aruba, 2014, pp. 415-418. [Bibtex]
    @inproceedings{talai2014d,
    abstract = {Conductor tracks comprise a frequency dependent attenuation of electromagnetic waves, since with increasing frequency the current flow is displaced to the near surface region due to the skin effect. Therefore, the effective length of the conductor is increased by the surface roughness, while its effective cross-section is decreased by current displacement, both leading to higher metallization loss. In this paper, surface topographies of typical conductor materials were recorded by confocal microscopy and rebuilt as 3D CAD models. Subsequent electromagnetic simulations reveal the influence due to roughness on high frequency characteristics for physical vapor deposited, thick film and photochemically etched microstrips.},
    author = {Talai, Armin and Gmeiner, Björn and Wegener, Carsten Moritz and Roosen, Andreas and Koelpin, Alexander and Steinhäußer, Frank and Deisinger, Ulrike and Bittner, Achim and Schmid, Ulrich and Weigel, Robert},
    language = {English},
    publisher = {Institute of Electrical and Electronics Engineers Inc.},
    booktitle = {Proceedings - 2014 International Conference on Electromagnetics in Advanced Applications, ICEAA 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1026284},
    year = {2014},
    month = {08},
    day = {03},
    doi = {10.1109/ICEAA.2014.6903887},
    eventdate = {2014-08-03/2014-08-08},
    eventtitle = {International Conference on Electromagnetics in Advanced Applications (ICEAA)},
    faupublication = {yes},
    pages = {415--418},
    peerreviewed = {Yes},
    title = {Electromagnetic analysis of conductor track surface roughnesses from 1 GHz to 110 GHz},
    type = {Konferenzschrift},
    url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6903887},
    venue = {Palm Beach, Aruba},
    }
  • [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, Melbourne, Australia, 2014, pp. 1516-1519. [Bibtex]
    @inproceedings{hamouda2014a,
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {IEEE International Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060084},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/ISCAS.2014.6865435},
    eventdate = {2014-06-01/2014-06-05},
    faupublication = {yes},
    keywords = {PLL,UWB,Radio,radar},
    pages = {1516--1519},
    peerreviewed = {Yes},
    title = {A 20-Gbps Low Jitter Analog Clock Recovery Circuit for Ultra Wide Band Radio Systems},
    venue = {Melbourne, Australia},
    }
  • [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, Waikoloa, HI, USA, 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},
    publisher = {IEEE},
    booktitle = {IEEE International Reliability Physics Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060113},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/IRPS.2014.6860669},
    eventdate = {2014-06-01/2014-06-05},
    faupublication = {yes},
    pages = {5C.5.1--5C.5.7},
    peerreviewed = {Yes},
    title = {Influence of Temperature Distribution on Behavior, Modeling, and Reliability of BAW Resonators},
    venue = {Waikoloa, HI, USA},
    }
  • [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 MTT-S International Microwave Symposium (IMS), Tampa, FL, USA, 2014, pp. 1-4. [Bibtex]
    @inproceedings{mann2014a,
    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.},
    author = {Mann, Sebastian and Lindner, Stefan and Lurz, Fabian and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Microwave Symposium (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060069},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/MWSYM.2014.6848655},
    eventdate = {2014-06-01/2014-06-06},
    faupublication = {yes},
    keywords = {Six-Port; position encoder; parallel plate waveguide; phase measurement},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A Microwave Interferometer Based Contactless Quasi-TEM Waveguide Position Encoder with Micrometer Accuracy},
    venue = {Tampa, FL, USA},
    }
  • [DOI] A. Radwan, 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, Tampa, FL, 2014, pp. 1-3. [Bibtex]
    @inproceedings{gharib2014,
    author = {Radwan, Ahmed and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE MTT-S International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060075},
    year = {2014},
    month = {06},
    doi = {10.1109/MWSYM.2014.6848528},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A 70 GHz bandwidth low-power active balun employing common-collector resisitive feedback in 0.35 um bipolar SiGe technology},
    venue = {Tampa, FL},
    }
  • [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 MTT-S International Microwave Symposium (IMS), Tampa Bay, FL, USA, 2014. [Bibtex]
    @inproceedings{nehring2014,
    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.},
    author = {Nehring, Johannes and Nasr, Ismail and Borutta, Karl and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE MTT-S International Microwave Symposium (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060109},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/MWSYM.2014.6848254},
    eventdate = {2014-06-01/2014-06-06},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Silicon Integrated Microwave Vector Network Analyzer for Biomedical Sensor Read-Out Applications},
    venue = {Tampa Bay, FL, USA},
    }
  • [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(ICC), Sydney, Australia, 2014. [Bibtex]
    @inproceedings{schroeter2014a,
    author = {Schröter, Simon and Brendel, Johannes and Weigel, Robert and Fischer, Georg},
    booktitle = {International Conference on Communications(ICC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059914},
    year = {2014},
    month = {06},
    day = {10},
    doi = {10.1109/ICC.2014.6884219},
    eventdate = {2014-06-10/2014-06-14},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Performance Improvement of UMTS Uplink Beamsteering with Limited Feedback at Higher Terminal Velocity by Designing Adapted Algorithms},
    venue = {Sydney, Australia},
    }
  • [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,
    abstract = {The demanding tasks for automotive radar systems in multitarget scenarios require an increased target separation performance and new sensor concepts. In this contribution, a highly integrated 77 GHz time domain multiplex (TDM) MIMO radar is presented. The sensor is feasible for advanced direction of arrival (DOA) estimation in azimuth and elevation. For efficient and high-quality measurements a fractional-n phased locked loop (PLL) with integrated waveform generator, enabling chirp and frequency modulated continous waveform (FMCW) modulations, is implemented. Spatial beamforming is done with series feed array patch antennas in combination with a dielectric cylindrical lens. For the improvement of the direction of arrival (DOA) estimation performance a new lens-based MIMO radar approach is introduced. Therefore the classical MIMO approach is combined with the advantages of an optical beamforming concept. Due to the usage of these techniques the sensor performance in accuracy, ambiguity suppression, and angular resolution can be significantly increased.},
    author = {Lutz, Steffen and Walter, Thomas and Weigel, Robert},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060095},
    year = {2014},
    month = {06},
    doi = {10.1017/S1759078714000506},
    faupublication = {yes},
    isbn = {9782874870330},
    issn = {1759-0787},
    journaltitle = {International Journal of Microwave and Wireless Technologies},
    keywords = {Radar applications; Radar architecture and systems},
    number = {3/4},
    pages = {397--404},
    peerreviewed = {Yes},
    title = {Lens-based 77 GHz MIMO Radar for Angular Estimation in Multitarget Environments},
    volume = {6},
    }
  • [DOI] A. Farabegoli, B. Sogl, J. Müller, and R. Weigel, "Advanced transmitters with combined crest factor reduction and digital predistortion techniques" in Radio and Wireless Symposium (RWS), 2014 IEEE, 2014. [Bibtex]
    @inproceedings{farabegoli2014a,
    author = {Farabegoli, Alessio and Sogl, Bernhard and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {Radio and Wireless Symposium (RWS), 2014 IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057374},
    year = {2014},
    month = {06},
    day = {19},
    doi = {10.1109/RWS.2014.6830153},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Advanced transmitters with combined crest factor reduction and digital predistortion techniques},
    type = {Konferenzschrift},
    }
  • [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, Gdansk, Poland, 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},
    booktitle = {MIKON},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060092},
    year = {2014},
    month = {06},
    day = {16},
    doi = {10.1109/MIKON.2014.6899880},
    eventdate = {2014-06-16/2014-06-18},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A 2-watt, 0.15-µm GaAs pHEMT stacked amplifier at 22 GHz},
    venue = {Gdansk, Poland},
    }
  • [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, Gdansk, Poland, 2014, pp. 1-4. [Bibtex]
    @inproceedings{mann2014b,
    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.},
    author = {Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {20th International Conference on Microwaves, Radar, and Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060070},
    year = {2014},
    month = {06},
    day = {16},
    doi = {10.1109/MIKON.2014.6899966},
    eventdate = {2014-06-16/2014-06-18},
    faupublication = {yes},
    keywords = {61 GHz; attenuator; bias network; p-i-n diode; reflection type; variable attenuator},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {61 GHz Millimeter Wave Voltage Variable Attenuator Based on Flip-Chip Mounted PIN-Diodes},
    venue = {Gdansk, Poland},
    }
  • [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 (MIKON), Gdansk, Poland, 2014. [Bibtex]
    @inproceedings{koelpin2014a,
    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.},
    author = {Koelpin, Alexander and Linz, Sarah and Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Lurz, Fabian and Weigel, Robert},
    booktitle = {20th International Conference on Microwaves, Radar, and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060088},
    year = {2014},
    month = {06},
    day = {16},
    doi = {10.1109/MIKON.2014.6899991},
    eventdate = {2014-06-16/2014-06-18},
    faupublication = {yes},
    keywords = {Six-Port; Selftest},
    peerreviewed = {Yes},
    title = {Selftest Strategies for Microwave Interferometry for High-Precision Industrial Distance Measurements},
    venue = {Gdansk, Poland},
    }
  • 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 Sensors and Measuring Systems; 17. ITG/GMA Symposium, Nürnberg, 2014, pp. 1-5. [Bibtex]
    @inproceedings{vinci2014,
    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.},
    author = {Vinci, Gabor and Linz, Sarah and Mann, Sebastian and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {VDE},
    booktitle = {Sensors and Measuring Systems; 17. ITG/GMA Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060106},
    year = {2014},
    month = {06},
    day = {03},
    eventdate = {2014-06-03/2014-06-04},
    faupublication = {yes},
    isbn = {9783800736225},
    keywords = {Six-Port; Radar; Vibration Monitoring; Industrial Environments; compact sensor},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {A Six-Port Radar System for Precise Distance Measurements and Vibration Monitoring in Industrial Environments},
    url = {http://ieeexplore.ieee.org/document/6856672},
    venue = {Nürnberg},
    }
  • [DOI] A. Koelpin and R. Weigel, "Six-Port Based Direction Finding and Ranging" in 20th International Conference on Microwaves, Radar, and Wireless Communications, Gdansk, Poland, 2014, pp. 1-5. [Bibtex]
    @inproceedings{koelpin2014b,
    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.},
    author = {Koelpin, Alexander and Weigel, Robert},
    booktitle = {20th International Conference on Microwaves, Radar, and Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060087},
    year = {2014},
    month = {06},
    day = {16},
    doi = {10.1109/MIKON.2014.6899826},
    eventdate = {2014-06-16/2014-06-18},
    faupublication = {yes},
    keywords = {Six-Port; Direction Finding; AoA; Ranging; Radar},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {Six-Port Based Direction Finding and Ranging},
    venue = {Gdansk, Poland},
    }
  • [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, Tampa Bay, Florida, 2014. [Bibtex]
    @inproceedings{hamouda2014b,
    abstract = {This paper presents a cross correlation based synchronization architecture between the clock of the receiver and the transmitter for ultra-wideband radio systems. The designed architecture is based on M-sequence signals instead of the conventional impulse signals. The M-sequence generator and the analog correlation circuit are fabricated on chip using a low cost 0.25µm 95GHz fmax SiGe-HBT-BiCMOS process technology. The chip is mounted on a printed circuit board (PCB) with a commercial voltage controlled oscillator. The measurement results show a low phase noise of the VCO of -66dBc/Hz at 1KHz offset and an rms jitter of 1.6ps for a 10GHz frequency and a bit rate of 20Gb/s.},
    author = {Hamouda, Mohamed and Lämmle, Benjamin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060086},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/MWSYM.2014.6848541},
    eventdate = {2014-06-01/2014-06-06},
    eventtitle = {2014 IEEE MTT-S International Microwave Symposium (IMS2014)},
    faupublication = {yes},
    keywords = {UWB},
    peerreviewed = {Yes},
    title = {A Cross Correlation Based Clock Synchronization up to 10GHz for Ultra-Wideband Sensing Systems},
    url = {http://ieeexplore.ieee.org/document/6848541/},
    venue = {Tampa Bay, Florida},
    }
  • [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), Tampa, Florida, USA, 2014, pp. 1-4. [Bibtex]
    @inproceedings{trenz2014,
    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.},
    author = {Trenz, Florian and Hofmann, Maximilian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    language = {English},
    publisher = {IEEE},
    booktitle = {2014 IEEE MTT-S International Microwave Symposium (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060064},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/MWSYM.2014.6848660},
    eventdate = {2014-06-01/2014-06-06},
    eventtitle = {IEEE MTT-S International Microwave Symposium},
    faupublication = {yes},
    keywords = {Wilkinson power divider; broadband},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Compact 2-28 GHz Planar Multi-Octave Bandwidth Wilkinson Power Dividers},
    type = {Konferenzschrift},
    venue = {Tampa, Florida, USA},
    }
  • [DOI] A. Chakraborty, S. Trotta, J. Wuertele, and R. Weigel, "A D-band transceiver front-end for broadband applications in a 0.35μm SiGe bipolar technology" in Radio Frequency Integrated Circuits Symposium, 2014 IEEE, 2014. [Bibtex]
    @inproceedings{chakraborty2014b,
    author = {Chakraborty, Abhiram and Trotta, Saverio and Wuertele, Johann and Weigel, Robert},
    booktitle = {Radio Frequency Integrated Circuits Symposium, 2014 IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1057370},
    year = {2014},
    month = {06},
    day = {01},
    doi = {10.1109/RFIC.2014.6851753},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A D-band transceiver front-end for broadband applications in a 0.35μm SiGe bipolar technology},
    type = {Konferenzschrift},
    }
  • 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, Berlin, Germany, 2014. [Bibtex]
    @inproceedings{linz2014,
    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.},
    author = {Linz, Sarah and Barbon, Francesco and Mann, Sebastian and Lindner, Stefan and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {CST Computer Simulation Technology AG},
    booktitle = {CST European User Conference 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060067},
    year = {2014},
    month = {05},
    eventtitle = {CST European User Conference},
    faupublication = {yes},
    keywords = {Six-Port; Radar; Power Detector},
    peerreviewed = {No},
    title = {Detector Design for Six-Port Radar},
    type = {undefined},
    url = {https://www.cst.com/Content/Events/Downloads/euc2014/5.4.1.pdf},
    venue = {Berlin, Germany},
    }
  • [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, Montevideo, Uruguay, 2014, pp. 919-922. [Bibtex]
    @inproceedings{schwerthoeffer2014,
    author = {Schwerthöffer, Udo and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Instrumentation and Measurement Technology Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060051},
    year = {2014},
    month = {05},
    doi = {10.1109/I2MTC.2014.6860876},
    faupublication = {yes},
    pages = {919--922},
    peerreviewed = {Yes},
    title = {Highly sensitive microwave resonant near-field sensor for precise aqueous glucose detection in microfluidic medical applications},
    venue = {Montevideo, Uruguay},
    }
  • 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, Berlin, 2014, pp. 1-20. [Bibtex]
    @inproceedings{talai2014e,
    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.},
    author = {Talai, Armin and Gmeiner, Björn and Weigel, Robert and Koelpin, Alexander},
    publisher = {CST Computer Simulation Technology AG},
    booktitle = {Computer Simulation Technology - European User Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060126},
    year = {2014},
    month = {05},
    faupublication = {yes},
    pages = {1--20},
    peerreviewed = {unknown},
    title = {Electromagnetic Analysis of Fringed Microstrip Lines on Dense and Porosified LTCC},
    url = {https://www.cst.com/Content/Events/Downloads/euc2014/5.4.2.pdf},
    venue = {Berlin},
    }
  • [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,
    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.},
    author = {Hartmann, Alexander and Strzoda, Rainer and Schrobenhauser, Robert and Weigel, Robert},
    publisher = {Springer-Verlag},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060099},
    year = {2014},
    month = {05},
    doi = {10.1007/S00340-013-5599-7},
    faupublication = {yes},
    issn = {0946-2171},
    journaltitle = {Applied Physics B-Lasers and Optics},
    number = {2},
    pages = {263--268},
    peerreviewed = {Yes},
    shortjournal = {APPL PHYS B-LASERS O},
    title = {Ultra-compact TDLAS humidity measurement cell with advanced signal processing},
    volume = {115},
    }
  • [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, Den Haag, Netherlands, 2014, pp. 3629-3633. [Bibtex]
    @inproceedings{gardill2014,
    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.},
    author = {Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Conference on Antennas and Propagation},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060112},
    year = {2014},
    month = {04},
    day = {06},
    doi = {10.1109/EUCAP.2014.6902616},
    eventdate = {2014-04-06/2014-04-11},
    faupublication = {yes},
    pages = {3629--3633},
    peerreviewed = {Yes},
    title = {Ultra-Wideband Small Modular Array Antenna Based on Column-Coupled Vivaldi Subarrays},
    venue = {Den Haag, Netherlands},
    }
  • C. Blümm, C. Heller, and R. Weigel, "Wireless Aircraft Cabin Communication - An ISM Band Cognitive Radio Approach" in 8th Karlsruhe Workshop on Software radios, Karlsruhe, Germany, 2014, pp. 1-4. [Bibtex]
    @inproceedings{bluemm2014,
    author = {Blümm, Christian and Heller, Christoph and Weigel, Robert},
    booktitle = {8th Karlsruhe Workshop on Software radios},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060119},
    year = {2014},
    month = {03},
    day = {12},
    eventdate = {2014-03-12/2016-03-13},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {No},
    title = {Wireless Aircraft Cabin Communication - An ISM Band Cognitive Radio Approach},
    venue = {Karlsruhe, Germany},
    }
  • [DOI] M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "Ultra Wide Band Power Amplifier for Miniaturized Antennas" in International Wireless Symposium (IWS), Xian, China, 2014, pp. 1-4. [Bibtex]
    @inproceedings{hamouda2014,
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {International Wireless Symposium (IWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060079},
    year = {2014},
    month = {03},
    day = {24},
    doi = {10.1109/IEEE-IWS.2014.6864260},
    eventdate = {2014-03-24/2014-03-26},
    faupublication = {yes},
    keywords = {UWB,amplifier},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Ultra Wide Band Power Amplifier for Miniaturized Antennas},
    venue = {Xian, China},
    }
  • [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), Newport Beach, USA, 2014, pp. 1-4. [Bibtex]
    @inproceedings{thomas2014,
    author = {Thomas, Anthony and Bakalski, Winfried and Ußmüller, Thomas and Weigel, Robert},
    booktitle = {IEEE Radio and Wireless Symposium (RWW)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060115},
    year = {2014},
    month = {03},
    day = {14},
    doi = {10.1109/IMARC.2013.6777725},
    eventdate = {2013-12-14/2013-12-16},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A MIM-cap free digitally tunable NMOS pi-network},
    venue = {Newport Beach, USA},
    }
  • [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, Xi'an China, 2014, pp. 1-4. [Bibtex]
    @inproceedings{roeber2014,
    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.},
    author = {Röber, Jürgen and Bänisch, Andreas and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE International Wireless Symposium (IWS) 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060105},
    year = {2014},
    month = {03},
    day = {24},
    doi = {10.1109/IEEE-IWS.2014.6864267},
    eventdate = {2014-03-24/2014-03-26},
    eventtitle = {2014 IEEE International Wireless Symposium (IWS 2014)},
    faupublication = {yes},
    keywords = {PLL; Synthesizer; Mixed-Signal; VCO; AAC; Behavioral Modeling; Diversity},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Frequency Synthesizer for Digital Satellite Radio Receiving Systems},
    type = {Konferenzschrift},
    url = {http://ieeexplore.ieee.org/document/6864267/},
    venue = {Xi'an China},
    }
  • 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 (Gemic), Aachen, 2014, pp. 1-4. [Bibtex]
    @inproceedings{nehring2014a,
    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.},
    author = {Nehring, Johannes and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {VDE},
    booktitle = {German Microwave Conference (Gemic)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060136},
    year = {2014},
    month = {03},
    day = {10},
    eventdate = {2014-03-10/2014-03-24},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {An 8-32GHz Frequency Synthesizer based on a Wideband VCO Array with Bandwidth Extension Stage},
    venue = {Aachen},
    }
  • [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, Aachen, Germany, 2014, pp. 1-4. [Bibtex]
    @inproceedings{gottardo2014,
    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.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060096},
    year = {2014},
    month = {03},
    day = {10},
    doi = {10.1109/MMM.2013.2288713},
    eventdate = {2014-03-10/2014-03-12},
    faupublication = {yes},
    keywords = {Active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends},
    venue = {Aachen, Germany},
    }
  • 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, Wien, Austria, 2014, pp. 1-4. [Bibtex]
    @inproceedings{zeller2014a,
    author = {Zeller, Christian and Muenker, Christian and Weigel, Robert},
    booktitle = {Workshop Analogschaltungen},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060117},
    year = {2014},
    month = {02},
    day = {24},
    eventdate = {2014-02-24/2014-02-25},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {No},
    title = {Ein Inverter-basierter zeitkontinuierlicher Sigma-Delta-ADC mit 20MS/s und 11Bit ENOB in 65nm CMOS},
    venue = {Wien, Austria},
    }
  • [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 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications, Pavia, Italy, 2014, pp. 1-4. [Bibtex]
    @inproceedings{talai2014a,
    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.},
    author = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060123},
    year = {2014},
    month = {02},
    day = {14},
    doi = {10.1109/NEMO.2014.6995723},
    eventdate = {2014-05-14/2014-05-16},
    faupublication = {yes},
    keywords = {CAD Modeling; Effective Permittivity; Field Simulation; material characterization; Microstrip Structure; Ring-Resonator; Trapezoidal Conductor},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {The Influence by Trapezoidal Conductor Shapes on Ring-Resonator based Material Characterization up to 110 GHz},
    venue = {Pavia, Italy},
    }
  • 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, Bad Staffelstein, 2014. [Bibtex]
    @inproceedings{talai2014c,
    author = {Talai, Armin and Donati, Giovanni and Weigel, Robert and Koelpin, Alexander},
    booktitle = {TuZ 2014 Testmethoden und Zuverlässigkeit von Schaltungen und Systemen},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060124},
    year = {2014},
    month = {02},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Test of alternative LTCC manufacturing processes for HF applications with realistic modeling of thick film technologies},
    venue = {Bad Staffelstein},
    }
  • [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 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), Peking, China, 2014, pp. 1-4. [Bibtex]
    @inproceedings{talai2014b,
    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.},
    author = {Talai, Armin and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060125},
    year = {2014},
    month = {02},
    day = {16},
    doi = {10.1109/URSIGASS.2014.6929397},
    eventdate = {2014-08-16/2014-10-20},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A simplified equivalent model for microwave characteristics of porosified LTCC},
    venue = {Peking, China},
    }
  • 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), Banz, Germany, 2014. [Bibtex]
    @inproceedings{oesterle2014,
    author = {Oesterle, Florian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {26. ITG/GI/GMM-Workshop: Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060052},
    year = {2014},
    month = {02},
    day = {23},
    eventdate = {2014-02-23/2014-02-25},
    faupublication = {yes},
    keywords = {MEMS; Parallel Testing; Mechanical Sensitivity; Pull-In; Microphone; Tomographic Reconstruction},
    peerreviewed = {No},
    title = {Ein paralleles Verfahren zum Volumentest von kapazitiven MEMS Sensoren},
    venue = {Banz, Germany},
    }
  • 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), Bad Staffelstein, 2014. [Bibtex]
    @inproceedings{koelpin2014,
    author = {Koelpin, Alexander and Mann, Sebastian and Lindner, Stefan and Linz, Sarah and Barbon, Francesco and Weigel, Robert},
    booktitle = {Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060122},
    year = {2014},
    month = {02},
    day = {23},
    eventdate = {2014-02-23/2014-02-25},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Selbstteststrategien für Mikrowellen-Interferometrie zur hoch-genauen industriellen Abstandsmessung},
    type = {Abstract zum Vortrag},
    venue = {Bad Staffelstein},
    }
  • [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), Queenstown, New Zealand, 2014, pp. 75-78. [Bibtex]
    @inproceedings{schwarzmeier2014,
    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.},
    author = {Schwarzmeier, Andre and Besser, J. and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {2014 IEEE Sensors Applications Symposium (SAS 2014)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060074},
    year = {2014},
    month = {02},
    doi = {10.1109/SAS.2014.6798920},
    faupublication = {yes},
    keywords = {Index Terms--- remote health monitoring; medical information system; fall-detection; localization; sensor processing; data fusion},
    pages = {75--78},
    peerreviewed = {Yes},
    title = {A Compact Back-Plaster Sensor Node for Dementia and Alzheimer Patient Care},
    venue = {Queenstown, New Zealand},
    }
  • [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 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), New Port Beach, CA, USA, 2014, pp. 13-15. [Bibtex]
    @inproceedings{barbon2014,
    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.},
    author = {Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060104},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/WISNET.2014.6825501},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    keywords = {six-port; diode detector; power measurement; characterization; in-situ},
    pages = {13--15},
    peerreviewed = {Yes},
    title = {Fast In-Situ Diode Detector Characterization for Six-Port Interferometer Receivers},
    venue = {New Port Beach, CA, USA},
    }
  • [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, Newport Beach, USA, 2014, pp. 38-40. [Bibtex]
    @inproceedings{elmaghraby2014,
    author = {Elmaghraby, Ahmed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {IEEE Silicon Monolithic Integrated Circuits in RF Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060097},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/SIRF.2014.6828503},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {38--40},
    peerreviewed = {Yes},
    title = {An inductor-less LTE receiver using an 8-path filter for TX leakage suppression},
    venue = {Newport Beach, USA},
    }
  • [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 & Radiative Transfer, vol. 133, pp. 619-623, 2014. [Bibtex]
    @article{hartmann2014b,
    abstract = {The Arndt formula for Lorentzian signals broadened by modulation is enhanced for the usage on 2f WMS (wavelength modulation spectroscopy) signals produced by spectroscopic lines with high absorption (percent range). Next to the first order approach of the Beer–Lambert law, which is covered by the Arndt formula, a second order term is included for a better approximation of the damped Lorentzian line shape. This second order approximation of the 2f signal can be described by a combination of several components created by the Arndt formula. The error of a pure Arndt evaluation and the improvement of the Arndt extended technique are illustrated in the example of a humidity measurement performed at 100~°C and up to 100~vol%. The energy transition at ν=10,526.274910~cm-1 is used in this setup. With the presented technique, the error is reduced by a factor of 90.},
    author = {Hartmann, Alexander and Strzoda, Rainer and Schrobenhauser, Robert and Weigel, Robert},
    publisher = {Pergamon Press},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059998},
    year = {2014},
    month = {01},
    doi = {10.1016/J.JQSRT.2013.09.026},
    faupublication = {yes},
    issn = {0022-4073},
    journaltitle = {Journal of Quantitative Spectroscopy & Radiative Transfer},
    keywords = {Arndt extension; Wavelength modulation spectroscopy; High absorption; Optically thick conditions; TDLAS},
    pages = {619--623},
    peerreviewed = {Yes},
    shortjournal = {J QUANT SPECTROSC RA},
    title = {Extending the applicability of the Arndt formula in wavelength modulation spectroscopy for absorbance in the lower percent range},
    volume = {133},
    }
  • [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), Newport Beach, CA, USA, 2014, pp. 50-52. [Bibtex]
    @inproceedings{chakraborty2014,
    author = {Chakraborty, Abhiram and Trotta, Saverio and Aufinger, Klaus and Lachner, Rudolf and Weigel, Robert},
    booktitle = {IEEE Radio and Wireless Symposium (RWW)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060077},
    year = {2014},
    month = {01},
    doi = {10.1109/SIRF.2014.6828534},
    faupublication = {yes},
    pages = {50--52},
    peerreviewed = {Yes},
    title = {A low-power, low-noise, highly-linear receiver for 122 GHz applications in a SiGe BiCMOS technology},
    venue = {Newport Beach, CA, USA},
    }
  • [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 Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Newport Beach, CA, USA, 2014, pp. 4-6. [Bibtex]
    @inproceedings{mann2014,
    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.},
    author = {Mann, Sebastian and Lindner, Stefan and Linz, Sarah and Barbon, Francesco and Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060116},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/WISNET.2014.6825512},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    keywords = {Six-Port; Interferometer; tank; level monitoring; parallel plate waveguide,; RADAR; microwave measurement},
    pages = {4--6},
    peerreviewed = {Yes},
    title = {A Tank Level Sensor Based on Six-Port Technique Comprising a quasi-TEM Waveguide},
    venue = {Newport Beach, CA, USA},
    }
  • [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, Newport Beach, CA, USA, 2014, pp. 1-3. [Bibtex]
    @inproceedings{glock2014,
    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.},
    author = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060054},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/PAWR.2014.6825726},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A Semi-Physical Power Amplifier Behavioral Model Capable of Predicting Gain Expansion Effects},
    venue = {Newport Beach, CA, USA},
    }
  • [DOI] A. Talai, S. Mann, R. Weigel, and A. Koelpin, "Water Temperature Measurement by Microwave Six-Port Interferometry at 24 GHz" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), New Port Beach, CA, USA, 2014, pp. 10-12. [Bibtex]
    @inproceedings{talai2014,
    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.},
    author = {Talai, Armin and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060120},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/WISNET.2014.6825498},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {10--12},
    peerreviewed = {Yes},
    title = {Water Temperature Measurement by Microwave Six-Port Interferometry at 24 GHz},
    venue = {New Port Beach, CA, USA},
    }
  • [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), Newport Beach, CA, USA, 2014, pp. 28-30. [Bibtex]
    @inproceedings{schwarzmeier2013,
    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.},
    author = {Schwarzmeier, Andre and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060073},
    year = {2014},
    month = {01},
    doi = {10.1109/BIOWIRELESS.2014.6827736},
    faupublication = {yes},
    keywords = {Index Terms--- semi active UHF RFID; remote fall monitoring; sensor tag; localization; Ambient Assisted Living (AAL); sensor processing},
    pages = {28--30},
    peerreviewed = {Yes},
    title = {A Low-Power Fall Detection and Activity Monitoring System for Nursing Facilities and Hospitals},
    venue = {Newport Beach, CA, USA},
    }
  • [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), Newport Beach, USA, 2014, pp. 244-246. [Bibtex]
    @inproceedings{schroeter2014,
    abstract = {So called open loop transmit diversity algorithms for the uplink of UMTS use the power control commands as feedback to iteratively determine the antenna weights. The algorithms presented in literature so far are designed for continuous transmission. The UMTS standard, however, also allows discontinuous uplink transmission (DTX), which impairs the performance of these algorithms. This paper studies these impairments and proposes a method to design transmit diversity algorithms with improved performance in a DTX scenario. With such improved algorithms, the transmit power gain is 1.4 dB in DTX, which is an improvement of 0.7 dB over conventional non-DTX diversity algorithms.},
    author = {Schröter, Simon and Rieß, Steffen and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE Radio and Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060114},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/RWS.2014.6830142},
    eventdate = {2014-01-19/2014-01-23},
    faupublication = {yes},
    pages = {244--246},
    peerreviewed = {Yes},
    title = {Enhancing Open Loop Beamsteering Performance for the Uplink of UMTS/HSPA+ under Discontinuous Transmission},
    venue = {Newport Beach, USA},
    }
  • [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},
    publisher = {Springer-Verlag},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060083},
    year = {2014},
    doi = {10.1007/S00340-014-5791-4},
    faupublication = {yes},
    issn = {0946-2171},
    journaltitle = {Applied Physics B-Lasers and Optics},
    pages = {1023--1026},
    peerreviewed = {Yes},
    shortjournal = {APPL PHYS B-LASERS O},
    title = {CO2 sensor for mainstream capnography based on TDLAS},
    }
  • [DOI] J. Nehring, M. Schütz, R. Weigel, and D. Kissinger, "A microwave permittivity sensing system based on a hybrid heterodyne reflectometer circuit" in Microwave Conference (EuMC), 2014 44th European, 2014, pp. 159-162. [Bibtex]
    @inproceedings{nehring2014b,
    author = {Nehring, Johannes and Schütz, Martin and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {Microwave Conference (EuMC), 2014 44th European},
    cris = {https://cris.fau.de/converis/publicweb/publication/1047094},
    year = {2014},
    doi = {10.1109/EUMC.2014.6986394},
    faupublication = {yes},
    pages = {159--162},
    peerreviewed = {Yes},
    title = {A microwave permittivity sensing system based on a hybrid heterodyne reflectometer circuit},
    type = {Konferenzschrift},
    }
  • [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},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060110},
    year = {2014},
    doi = {10.1109/JSSC.2014.2321063},
    faupublication = {yes},
    issn = {0018-9200},
    journaltitle = {IEEE Journal of Solid-State Circuits},
    number = {7},
    pages = {1548--1560},
    peerreviewed = {Yes},
    shortjournal = {IEEE J SOLID-ST CIRC},
    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},
    volume = {49},
    }

2013

  • [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), Carrara, Australia, 2013, pp. 1-8. [Bibtex]
    @inproceedings{bluemm2013b,
    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.},
    author = {Blümm, Christian and Heller, Christoph and Fourestie, B. and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {7th International Conference on Signal Processing and Communication Systems (ICSPCS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060038},
    year = {2013},
    month = {12},
    day = {16},
    doi = {10.1109/ICSPCS.2013.6723935},
    eventdate = {2013-12-16/2013-12-18},
    faupublication = {yes},
    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},
    pages = {1--8},
    peerreviewed = {unknown},
    title = {Air-to-ground channel characterization for OFDM communication in C-Band},
    venue = {Carrara, Australia},
    }
  • [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,
    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.},
    author = {Nasr, Ismail and Lämmle, Benjamin and Aufinger, Klaus and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059977},
    year = {2013},
    month = {12},
    doi = {10.1109/TMTT.2013.2285280},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {12},
    pages = {4600--4612},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A 70 to 90 GHz High-Linearity Multi-Band Quadrature Receiver in 0.35 μm SiGe Technology},
    volume = {61},
    }
  • [DOI] T. Ußmüller, D. Brenk, J. Eßel, J. Heidrich, G. Fischer, and R. Weigel, "Remote Powered Medical Implants" in MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), , Singapore, 2013, pp. 1-3. [Bibtex]
    @inproceedings{ussmueller2013b,
    author = {Ußmüller, Thomas and Brenk, Daniel and Eßel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    booktitle = {MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060017},
    year = {2013},
    month = {12},
    day = {09},
    doi = {10.1109/IMWS-BIO.2013.6756186},
    eventdate = {2013-12-09/2013-12-11},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Remote Powered Medical Implants},
    venue = {, Singapore},
    }
  • N. Franchi, G. Fischer, and R. Weigel, "Adaptive Automobilfunksysteme" in Embedded Software Engineering Kongress, Sindelfingen, 2013, pp. 56-62. [Bibtex]
    @inproceedings{franchi2013c,
    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.},
    author = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    publisher = {Vogel Business Media},
    booktitle = {Embedded Software Engineering Kongress},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060013},
    year = {2013},
    month = {12},
    faupublication = {yes},
    keywords = {Software Defined Radio; Wireless Vehicular Communication Systems; Car-to-X; IEEE 802.11p},
    pages = {56--62},
    peerreviewed = {unknown},
    title = {Adaptive Automobilfunksysteme},
    venue = {Sindelfingen},
    }
  • 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), Bad Staffelstein, 2013. [Bibtex]
    @inproceedings{barbon2013,
    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.},
    author = {Barbon, Francesco and Lindner, Stefan and Mann, Sebastian and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {GMM, ITG},
    booktitle = {Testmethoden und Zuverlässigkeit von Schaltungen und Systemen (TuZ)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060023},
    year = {2013},
    month = {12},
    faupublication = {yes},
    keywords = {six-port; diode detector; power measurement; in-situ},
    peerreviewed = {Yes},
    title = {Characterization In-Situ of Diode Detectors for Six-Port receivers},
    venue = {Bad Staffelstein},
    }
  • [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,
    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.},
    author = {Linz, Sarah and Vinci, Gabor and Mann, Sebastian and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {Hindawi Publishing Corporation},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060046},
    year = {2013},
    month = {12},
    doi = {10.1155/2013/382913},
    faupublication = {yes},
    issn = {2090-0147},
    journaltitle = {Journal of Electrical and Computer Engineering},
    pages = {1--10},
    peerreviewed = {Yes},
    title = {A Compact, Versatile Six-Port Radar Module for Industrial and Medical Applications},
    volume = {2013},
    }
  • [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), New Delhi, India, 2013, pp. 1-4. [Bibtex]
    @inproceedings{glock2013c,
    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.},
    author = {Glock, Stefan and Rascher, Jochen and Sogl, Bernhard and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {International Microwave and RF Conference (IMaRC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059917},
    year = {2013},
    month = {12},
    doi = {10.1109/IMARC.2013.6777718},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A Novel Power Amplifier Behavioral Model for Improving the Linearity-Efficiency Tradeoff},
    venue = {New Delhi, India},
    }
  • [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, Baltimore, USA, 2013, pp. 1-4. [Bibtex]
    @inproceedings{oesterle2013b,
    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},
    author = {Oesterle, Florian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Sensors},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059950},
    year = {2013},
    month = {11},
    doi = {10.1109/ICSENS.2013.6688626},
    faupublication = {yes},
    keywords = {MEMS; Parallel Testing; Mechanical Sensitivity; Pull-In; Microphone; Tomographic Reconstruction},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A New Approach on MEMS Sensor Batch Testing Using an Analogue Parallel Test Methodology for Massive Reduction of Test Time},
    venue = {Baltimore, USA},
    }
  • [DOI] S. M. Pour Mousavi, M. Wojnowski, R. Agethen, R. Weigel, and A. Hagelauer, "Antenna Array in eWLB for 61 GHz FMCW Radar" in Asia-Pacific Microwave Conference Proceedings (APMC), Seoul, 2013, pp. 310-312. [Bibtex]
    @inproceedings{pourmousavi2013c,
    author = {Pour Mousavi, Seyed Mehran and Wojnowski, Maciej and Agethen, Roman and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {Asia-Pacific Microwave Conference Proceedings (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059995},
    year = {2013},
    month = {11},
    day = {05},
    doi = {10.1109/APMC.2013.6695129},
    eventdate = {2013-11-05/2013-11-08},
    faupublication = {yes},
    pages = {310--312},
    peerreviewed = {unknown},
    title = {Antenna Array in eWLB for 61 GHz FMCW Radar},
    venue = {Seoul},
    }
  • 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, Baltimore, USA, 2013. [Bibtex]
    @inproceedings{linz2013a,
    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.},
    author = {Linz, Sarah and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {IEEE Sensors},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060047},
    year = {2013},
    month = {11},
    eventtitle = {IEEE Sensors},
    faupublication = {yes},
    peerreviewed = {No},
    title = {A Compact, Versatile Six-Port Radar Sensor for Industrial and Medical Applications},
    type = {Abstract zum Poster},
    venue = {Baltimore, USA},
    }
  • [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,
    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.},
    author = {Steinhäußer, Frank and Talai, Armin and Steiger-Thirsfeld, A. and Koelpin, Alexander and Weigel, Robert and Bittner, Achim and Schmid, Ulrich},
    publisher = {Elsevier},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059940},
    year = {2013},
    month = {11},
    doi = {10.1016/J.JEURCERAMSOC.2014.01.021},
    faupublication = {yes},
    issn = {0955-2219},
    journaltitle = {Journal of the European Ceramic Society},
    keywords = {porosity; dielectric properties; glass ceramics; graphical method; wet etching},
    number = {11},
    pages = {2833--2838},
    peerreviewed = {Yes},
    shortjournal = {J EUR CERAM SOC},
    title = {Graphical based characterisation and modelling of material gradients in porosified LTCC},
    volume = {34},
    }
  • 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), Nuremberg, Germany, 2013, pp. 423-426. [Bibtex]
    @inproceedings{hamouda2013,
    author = {Hamouda, Mohamed and Scotto di Clemente, Francesco and Hein, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059993},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    pages = {423--426},
    peerreviewed = {Yes},
    title = {Ultra Wide Band Low-Power Amplifier Integrated on Miniaturized Antenna for Biomedical Applications},
    venue = {Nuremberg, Germany},
    }
  • 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, Nuremberg, Germany, 2013, pp. 304-307. [Bibtex]
    @inproceedings{milosiu2013,
    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.},
    author = {Milosiu, Heinrich and Oehler, Frank and Weigel, Robert},
    booktitle = {European Microwave Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059988},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-08},
    faupublication = {yes},
    pages = {304--307},
    peerreviewed = {Yes},
    title = {A 2.4-µA 868-MHz low latency wake-up receiver for strong interference channels},
    venue = {Nuremberg, Germany},
    }
  • [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, San Jose, USA, 2013, pp. 43-46. [Bibtex]
    @inproceedings{seler2013,
    author = {Seler, Ernst and Wojnowski, Maciej and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {IEEE Conference Electrical Performance of Electronic Packaging and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059942},
    year = {2013},
    month = {10},
    doi = {10.1109/EPEPS.2013.6703463},
    faupublication = {yes},
    pages = {43--46},
    peerreviewed = {Yes},
    title = {New Simulation Procedure for Accurate Package Modeling Considering Chip-Package Interaction},
    venue = {San Jose, USA},
    }
  • R. Agethen, S. 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, Nuremberg, Germany, 2013, pp. 121-124. [Bibtex]
    @inproceedings{agethen2013a,
    author = {Agethen, Roman and Pour Mousavi, Seyed Mehran and Mengs, P. and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059956},
    year = {2013},
    month = {10},
    faupublication = {yes},
    pages = {121--124},
    peerreviewed = {Yes},
    title = {FPGA-based signal control for highly integrated 60 GHz radar distance measurements},
    venue = {Nuremberg, Germany},
    }
  • 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), Nürnberg, 2013, pp. 165-168. [Bibtex]
    @inproceedings{zohny2013a,
    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},
    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},
    publisher = {IEEE},
    booktitle = {European Microwave Integrated Circuits Conference (EuMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060015},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-08},
    faupublication = {yes},
    keywords = {Power amplifier; Stacked FET; Stacked cascode; CMOS; linearization; ruggedness},
    pages = {165--168},
    peerreviewed = {Yes},
    title = {Analog Compensation of AM-AM and AM-PM effects for HighEfficiency Stacked-FET Power Amplifiers in 65-nm Standard CMOS},
    venue = {Nürnberg},
    }
  • [DOI] A. Radwan, 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, Bordeaux, France, 2013, pp. 115-118. [Bibtex]
    @inproceedings{gharib2013,
    author = {Radwan, Ahmed and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Bipolar/BiCMOS Circuits and Technology Meeting},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059939},
    year = {2013},
    month = {10},
    doi = {10.1109/BCTM.2013.6798157},
    faupublication = {yes},
    pages = {115--118},
    peerreviewed = {Yes},
    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},
    venue = {Bordeaux, France},
    }
  • 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 (MST), Aachen, 2013. [Bibtex]
    @inproceedings{steinhaeusser2013,
    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.},
    author = {Steinhäußer, Frank and Talai, Armin and Koelpin, Alexander and Weigel, Robert and Bittner, Achim and Schmid, Ulrich},
    publisher = {GMM VDE/VDI-Gesellschaft Mikroelektronik, Mikrosystem- und Feinwerktechnik},
    booktitle = {Mikrosystemtechnik-Kongress (MST)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059922},
    year = {2013},
    month = {10},
    day = {14},
    eventdate = {2013-10-14/2013-10-16},
    faupublication = {yes},
    isbn = {9783800735556},
    peerreviewed = {Yes},
    title = {The impact of the material distribution of porousified LTCC on the effective permittivity investigated by finite 3D field simulation},
    venue = {Aachen},
    }
  • S. Glock, R. Rosales, F. Reutelhuber, 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 Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference, Nuremberg, Germany, 2013, pp. 342-345. [Bibtex]
    @inproceedings{glock2013b,
    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. © 2013 European Microwave Association.},
    author = {Glock, Stefan and Rosales, Rafael and Reutelhuber, Franz and Glaß, Michael and Teich, Jürgen and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025889},
    year = {2013},
    month = {10},
    day = {07},
    eventdate = {2013-10-07/2013-10-10},
    eventtitle = {43rd European Microwave Conference (EuMC)},
    faupublication = {yes},
    pages = {342--345},
    peerreviewed = {Yes},
    title = {Scenario-Based Energy Estimation of Heterogeneous Integrated Systems at System Level},
    venue = {Nuremberg, Germany},
    }
  • 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},
    publisher = {VDE},
    booktitle = {German Microwave Conference 2014},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060034},
    year = {2013},
    month = {10},
    faupublication = {yes},
    pages = {1--2},
    peerreviewed = {Yes},
    title = {Microwave Sensor for Precise Permittivity Characterization of Liquids Used for Aqueous Glucose Detection in Medical Applications},
    }
  • J. Rascher, A. Zohny, and R. Weigel, "Integrated Reconfigurable CMOS Power Amplifiers" in European Microwave Conference (EuMC), Nuremberg, Germany, 2013. [Bibtex]
    @inproceedings{rascher2013a,
    abstract = {Technologies for Embedded Wireless Systems Workshop},
    author = {Rascher, Jochen and Zohny, Amr and Weigel, Robert},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059934},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Integrated Reconfigurable CMOS Power Amplifiers},
    venue = {Nuremberg, Germany},
    }
  • 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 (EuRAD), Nürnberg, 2013. [Bibtex]
    @inproceedings{mann2013,
    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.},
    author = {Mann, Sebastian and Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059980},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    keywords = {Six-Port; Direction-Of-Arrival; Phase measurement; Power Detector; pHEMT},
    peerreviewed = {Yes},
    title = {Improved Dual Six-Port Receiver Structure for Two-Dimensional Direction of Arrival Detection Using pHEMT Power Detectors},
    venue = {Nürnberg},
    }
  • S. 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, Nuremberg, Germany, 2013, pp. 444-447. [Bibtex]
    @inproceedings{pourmousavi2013b,
    author = {Pour Mousavi, Seyed Mehran and Wojnowski, Maciej and Agethen, Roman and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {IEEE European Microwave Integrated Circuit Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059996},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    pages = {444--447},
    peerreviewed = {Yes},
    title = {Antenna Design and Characterization for a 61 GHz Transceiver in eWLB Package},
    venue = {Nuremberg, Germany},
    }
  • 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, Nürnberg, 2013, pp. 460-463. [Bibtex]
    @inproceedings{lindner2013a,
    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.},
    author = {Lindner, Stefan and Vinci, Gabor and Barbon, Francesco and Linz, Sarah and Mann, Sebastian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059961},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    keywords = {delay lines; frequency measurement; Detectors; millimeter wave measurement; phase measurement},
    pages = {460--463},
    peerreviewed = {Yes},
    title = {Instantaneous frequency measurement based on low-cost Six-Port technology},
    url = {http://ieeexplore.ieee.org/document/6686691/},
    venue = {Nürnberg},
    }
  • 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, Nuremberg, Germany, 2013. [Bibtex]
    @inproceedings{schnabel2013a,
    author = {Schnabel, Raik and Steinbuch, Dirk and Weigel, Robert},
    booktitle = {European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059959},
    year = {2013},
    month = {10},
    day = {09},
    eventdate = {2013-10-09/2013-10-11},
    faupublication = {yes},
    isbn = {9781479902651},
    peerreviewed = {Yes},
    title = {An ISO 26262 compliant built-in self-test for 77 GHz automotive radar sensors},
    venue = {Nuremberg, Germany},
    }
  • 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, Miltenberg, 2013. [Bibtex]
    @inproceedings{koelpin2013c,
    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.},
    author = {Koelpin, Alexander and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Talai, Armin and Weigel, Robert},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060000},
    year = {2013},
    month = {10},
    day = {23},
    eventdate = {2013-09-23/2013-09-25},
    faupublication = {yes},
    keywords = {Six-Port; Interferometer},
    peerreviewed = {Yes},
    title = {The Six-Port Structure as a Precise Measurement Tool - A New Rise of an Old Concept},
    type = {Abstract zum Vortrag},
    venue = {Miltenberg},
    }
  • 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, Nuremberg, Germany, 2013, pp. 488-491. [Bibtex]
    @inproceedings{sandro2013,
    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.},
    author = {Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {European Microwave Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059923},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    pages = {488--491},
    peerreviewed = {Yes},
    title = {Extension of the Load-Line Theory by Investigating the Impact of the Knee-Voltage on Output-Power and Efficiency},
    venue = {Nuremberg, Germany},
    }
  • 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), Nürnberg, 2013, pp. 1587-1590. [Bibtex]
    @inproceedings{koelpin2013b,
    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.},
    author = {Koelpin, Alexander and Vinci, Gabor and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Linz, Sarah and Oesterle, Florian and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059999},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    pages = {1587--1590},
    peerreviewed = {Yes},
    title = {Six-Port Technology for Precise Geometrical Measurement Applications - an Overview},
    url = {http://ieeexplore.ieee.org/document/6686975/},
    venue = {Nürnberg},
    }
  • [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, Boston, MA, USA, 2013. [Bibtex]
    @inproceedings{gardill2013f,
    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.},
    author = {Gardill, Markus and Finkenzeller, Klaus and Hinz, Walter and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {ICST},
    booktitle = {8th International Conference on Body Area Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060009},
    year = {2013},
    month = {10},
    doi = {10.4108/ICST.BODYNETS.2013.253614},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Review and Comparative Study of On- and Off-Body Performance of Platform-Tolerant UHF RFID Tag Antennas},
    venue = {Boston, MA, USA},
    }
  • [DOI] S. Mueller, F. Lurz, R. Weigel, and A. Koelpin, "A High Performance Line Filter for Narrowband Power Line Communication Testbed Applications" in IEEE International Conference on Smart Grid Communications (SmartGridComm), Vancouver, Canada, 2013, pp. 690-695. [Bibtex]
    @inproceedings{mueller2013,
    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.},
    author = {Mueller, Steffen and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE International Conference on Smart Grid Communications (SmartGridComm)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059944},
    year = {2013},
    month = {10},
    day = {21},
    doi = {10.1109/SMARTGRIDCOMM.2013.6688039},
    eventdate = {2013-10-21/2013-10-24},
    faupublication = {yes},
    keywords = {Power Line Communication; Smart Grid; Line Filter; Electromagnetic Interference; Testbed},
    pages = {690--695},
    peerreviewed = {Yes},
    title = {A High Performance Line Filter for Narrowband Power Line Communication Testbed Applications},
    venue = {Vancouver, Canada},
    }
  • 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 Microwave Conference (EuMC), 2013 European, Nuremberg, Germany, 2013. [Bibtex]
    @inproceedings{oesterle2013a,
    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.},
    author = {Oesterle, Florian and Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Microwave Conference (EuMC), 2013 European},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059949},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    keywords = {MEMS; Mechanical Resonance; Mechanical Sensitivity; Contactless Testing; Microwave Reflectometry; Deflection Measurement; W-band; Microphone; Inline Integration},
    peerreviewed = {Yes},
    title = {Evaluation of a Microwave Based Contact-Free Testing Method for Mechanical Sensitivity Analysis of MEMS for Inline Integration of On-Wafer Measurements},
    venue = {Nuremberg, Germany},
    }
  • 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), Nürnberg, 2013. [Bibtex]
    @inproceedings{nehring2013,
    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.},
    author = {Nehring, Johannes and Nasr, Ismail and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {European Microwave Integrated Circuits Conference (EuMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059973},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-08},
    faupublication = {yes},
    keywords = {VCO; signal source; wideband; microwave; octave-wide bandwidth},
    peerreviewed = {Yes},
    title = {A Single-Chip 15-32 GHz Signal Source in SiGe Bipolar Technology},
    url = {http://ieeexplore.ieee.org/document/6687791/},
    venue = {Nürnberg},
    }
  • [DOI] J. Brendel, S. Rieß, R. Weigel, and G. Fischer, "A cognitive system for future‐proof wireless microphones: Concept, Implementation and Results" in 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS), Nis, Serbia, 2013. [Bibtex]
    @inproceedings{brendel2013a,
    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.},
    author = {Brendel, Johannes and Rieß, Steffen and Weigel, Robert and Fischer, Georg},
    booktitle = {11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059985},
    year = {2013},
    month = {10},
    day = {16},
    doi = {10.1109/TELSKS.2013.6704934},
    eventdate = {2013-10-16/2013-10-19},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A cognitive system for future‐proof wireless microphones: Concept, Implementation and Results},
    venue = {Nis, Serbia},
    }
  • 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 Radar Conference (EuRAD), Nürnberg, 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},
    publisher = {IEEE},
    booktitle = {European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060031},
    year = {2013},
    month = {10},
    day = {09},
    eventdate = {2013-10-09/2013-10-11},
    faupublication = {yes},
    pages = {1599--1602},
    peerreviewed = {Yes},
    title = {Six-Port Microwave Interferometer Radar for Mechanical Vibration Analysis},
    url = {http://ieeexplore.ieee.org/document/6689170},
    venue = {Nürnberg},
    }
  • 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), Nuremberg, DE, 2013, pp. 557-560. [Bibtex]
    @inproceedings{weigel2013a,
    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.},
    author = {Pinarello, Sandro and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059931},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-10},
    faupublication = {yes},
    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},
    pages = {557--560},
    peerreviewed = {Yes},
    title = {Comparative Evaluation of Different Current Saving Strategies for Power Amplifiers in Back-Off Operation},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686716},
    venue = {Nuremberg, DE},
    }
  • A. Esswein, C. Carlowitz, M. Vossiek, R. Weigel, and T. Ußmüller, "An Improved Switched Injection-Locked Oscillator for Ranging and Communication Systems" in European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference, Nuremberg, Germany, 2013, pp. 1563-1566. [Bibtex]
    @inproceedings{esswein2013a,
    abstract = {This paper describes an improved integrated switched injection-locked oscillator (SILO) circuit for use in pulsed angular modulated ultra wideband communication and radar systems, implemented in a 0.25 µm SiGe:C BiCMOS technology. The circuit consists of two active baluns for single-ended to differential and differential to single-ended conversion, a Schmitt-trigger with two pulse generators based on current-starved voltage controlled delay lines and inverter chains and a simple Q-degenerated cross-coupled oscillator for signal generation. It has an externally controllable pulse repetition rate and duration. The previous works of the authors [1] was severely improved in the area of required locking power and pulse duration control. Required injection power has been reduced to -65 dBm. During operation it consumes combined 40mA from 3.3V analog and 2.5V digital supply voltage, while generating a 370mV pp signal. The generated signal has a 10 dB-bandwidth ofs over 2.3 GHz at 6.8 GHz center frequency. Measurement results are shown. © 2013 European Microwave Association.},
    author = {Esswein, Alexander and Carlowitz, Christian and Vossiek, Martin and Weigel, Robert and Ußmüller, Thomas},
    language = {English},
    booktitle = {European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025696},
    year = {2013},
    month = {10},
    day = {07},
    eventdate = {2013-10-07/2013-10-10},
    eventtitle = {43rd European Microwave Conference},
    faupublication = {yes},
    isbn = {9782874870316},
    keywords = {Injection-Locking; Integrated Circuit; Pulse Generation; Pulsed Frequency Modulated Radar; Radar; VCO},
    pages = {1563--1566},
    peerreviewed = {Yes},
    title = {An Improved Switched Injection-Locked Oscillator for Ranging and Communication Systems},
    venue = {Nuremberg, Germany},
    }
  • 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, Nuremberg, DE, 2013, pp. 1543-1546. [Bibtex]
    @inproceedings{borutta2013,
    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.},
    author = {Borutta, Karl and Lämmle, Benjamin and Wagner, Christoph and Maurer, Linus and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {European Microwave Conference (EuMC), 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059924},
    year = {2013},
    month = {10},
    faupublication = {yes},
    keywords = {differential amplifiers; electric breakdown; millimetre wave bipolar transistors; millimetre wave power amplifiers; millimetre wave radar; programmable circuits; temperature measurement; Current measurement},
    pages = {1543--1546},
    peerreviewed = {Yes},
    title = {Design and Breakdown Behavior of 77GHz Variable Gain Power Amplifiers in SiGe- Technology},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6686964},
    venue = {Nuremberg, DE},
    }
  • A. Talai, R. Weigel, and A. Koelpin, "Field Distributions and Effective Permittivities Along Microstrip Structures on Homogeneous and Inhomogeneous Substrates up to 110 GHz" in European Microwave Conference Workshops, Nuremberg, Germany, 2013. [Bibtex]
    @inproceedings{talai2013d,
    abstract = {Rohde und Schwarz},
    author = {Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Microwave Conference Workshops},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060003},
    year = {2013},
    month = {10},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Field Distributions and Effective Permittivities Along Microstrip Structures on Homogeneous and Inhomogeneous Substrates up to 110 GHz},
    venue = {Nuremberg, Germany},
    }
  • A. Talai, R. Weigel, A. Koelpin, B. Gmeiner, U. Rüde, F. Steinhäußer, A. Bittner, and U. Schmid, "Electromagnetic field analysis with advanced structural modeling of microstrips on porosified LTCC" in European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference, Nürnberg, Germany, 2013, pp. 440-443. [Bibtex]
    @inproceedings{talai2013c,
    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. © 2013 European Microwave Association.},
    author = {Talai, Armin and Weigel, Robert and Koelpin, Alexander and Gmeiner, Björn and Rüde, Ulrich and Steinhäußer, Frank and Bittner, Achim and Schmid, Ulrich},
    language = {English},
    publisher = {IEEE},
    booktitle = {European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025919},
    year = {2013},
    month = {10},
    day = {07},
    eventdate = {2013-10-07/2013-10-10},
    eventtitle = {European Microwave Conference},
    faupublication = {yes},
    keywords = {Field simulation; inhomogeneous substrate; LTCC; porosification; reduction of permittivity; structural modeling},
    pages = {440--443},
    peerreviewed = {Yes},
    title = {Electromagnetic field analysis with advanced structural modeling of microstrips on porosified LTCC},
    type = {Konferenzschrift},
    venue = {Nürnberg, Germany},
    }
  • 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), Nuremberg, Germany, 2013, pp. 89-92. [Bibtex]
    @inproceedings{nasr2013a,
    author = {Nasr, Ismail and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {The European Microwave Integrated Circuits Conference (EuMIC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059976},
    year = {2013},
    month = {10},
    day = {06},
    eventdate = {2013-10-06/2013-10-08},
    faupublication = {yes},
    pages = {89--92},
    peerreviewed = {Yes},
    title = {A 50 to 100GHz frequency synthesizer with 17dB side-band suppression using a single VCO core},
    venue = {Nuremberg, Germany},
    }
  • [DOI] 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 39th European Solid State Circuits Conference, Bukarest, Romania, 2013, pp. 319-322. [Bibtex]
    @inproceedings{zeller2013,
    author = {Zeller, Christian and Muenker, Christian and Weigel, Robert},
    booktitle = {39th European Solid State Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060026},
    year = {2013},
    month = {09},
    day = {16},
    doi = {10.1109/ESSCIRC.2013.6649137},
    eventdate = {2013-09-16/2013-09-20},
    faupublication = {yes},
    isbn = {9781479906420},
    issn = {1930-8833},
    pages = {319--322},
    peerreviewed = {unknown},
    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},
    venue = {Bukarest, Romania},
    }
  • [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), Almaty, Kazakhstan, 2013, pp. 93-99. [Bibtex]
    @inproceedings{schroeter2013a,
    author = {Schröter, Simon and Weigel, Robert and Fischer, Georg},
    booktitle = {International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059915},
    year = {2013},
    month = {09},
    doi = {10.1109/ICUMT.2013.6798411},
    faupublication = {yes},
    pages = {93--99},
    peerreviewed = {unknown},
    title = {Employing Evolutionary Optimization for Designing Practical Beamsteering Algorithms for the Uplink of UMTS with Transmit Power Control Bits as Feedback},
    venue = {Almaty, Kazakhstan},
    }
  • [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 2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Turin, Italy, 2013, pp. 532-535. [Bibtex]
    @inproceedings{linz2013,
    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.},
    author = {Linz, Sarah and Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059932},
    year = {2013},
    month = {09},
    doi = {10.1109/APWC.2013.6624894},
    eventtitle = {2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    faupublication = {yes},
    isbn = {9781467356893},
    keywords = {Six-Port; multiband},
    pages = {532--535},
    peerreviewed = {Yes},
    title = {A Multiband 2-Port Vector Network Analyzer based on Six-Port Junctions for Biomedical Measurement Applications between 6 GHz and 33 GHz},
    venue = {Turin, Italy},
    }
  • [DOI] Z. Abou-Chahine, T. Felgentreff, G. Fischer, and R. Weigel, "An input amplitude modulated harmonic outphasing PA" in 13th Mediterranean Microwave Symposium (MMS), Saida, Lebanon, 2013, pp. 1-4. [Bibtex]
    @inproceedings{abou-chahine2013,
    author = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    booktitle = {13th Mediterranean Microwave Symposium (MMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059921},
    year = {2013},
    month = {09},
    day = {02},
    doi = {10.1109/MMS.2013.6663082},
    eventdate = {2013-09-02/2013-09-05},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {An input amplitude modulated harmonic outphasing PA},
    venue = {Saida, Lebanon},
    }
  • [DOI] C. Blümm, C. Heller, B. Fourestie, and R. Weigel, "Wideband aeronautical channel sounding and modeling for C-band telemetry" in 24th International Symposium on Personal indoor and Mobile Radio Communications (PIMRC), London, UK, 2013, pp. 264-269. [Bibtex]
    @inproceedings{bluemm2013a,
    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.},
    author = {Blümm, Christian and Heller, Christoph and Fourestie, Bertille and Weigel, Robert},
    booktitle = {24th International Symposium on Personal indoor and Mobile Radio Communications (PIMRC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060039},
    year = {2013},
    month = {09},
    day = {08},
    doi = {10.1109/PIMRC.2013.6666143},
    eventdate = {2013-09-08/2013-09-11},
    faupublication = {yes},
    keywords = {Aircraft; Chirp; Delays; Doppler shift; OFDM; Telemetry},
    pages = {264--269},
    peerreviewed = {unknown},
    title = {Wideband aeronautical channel sounding and modeling for C-band telemetry},
    venue = {London, UK},
    }
  • [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 Circuits and Technology Meeting (BCTM), Bordeaux, France, 2013, pp. 195-198. [Bibtex]
    @inproceedings{chakraborty2013,
    author = {Chakraborty, Abhiram and Trotta, Saverio and Weigel, Robert},
    booktitle = {IEEE Bipolar/BiCMOS Circuits and Technology Meeting (BCTM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059989},
    year = {2013},
    month = {09},
    day = {30},
    doi = {10.1109/BCTM.2013.6798174},
    eventdate = {2013-09-30/2013-10-03},
    faupublication = {yes},
    pages = {195--198},
    peerreviewed = {Yes},
    title = {A low-phase-noise monolithically integrated 60 GHz push-push VCO for 122 applications in a SiGe Bipolar technology},
    venue = {Bordeaux, France},
    }
  • [DOI] S. 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 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Torino, Italy, 2013, pp. 828-831. [Bibtex]
    @inproceedings{pourmousavi2013a,
    author = {Pour Mousavi, Seyed Mehran and Wojnowski, Maciej and Agethen, Roman and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059994},
    year = {2013},
    month = {09},
    day = {09},
    doi = {10.1109/APWC.2013.6624913},
    eventdate = {2013-09-09/2013-09-13},
    faupublication = {yes},
    pages = {828--831},
    peerreviewed = {Yes},
    title = {The Impact of embedded wafer level BGA Package on the Antenna Performance},
    venue = {Torino, Italy},
    }
  • [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 Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013, Torino, Italy, 2013, pp. 1189-1192. [Bibtex]
    @inproceedings{talai2013b,
    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. © 2013 IEEE.},
    author = {Talai, Armin and Steinhäußer, Frank and Gmeiner, Björn and Bittner, Achim and Rüde, Ulrich and Schmid, Ulrich and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025918},
    year = {2013},
    month = {09},
    day = {09},
    doi = {10.1109/ICEAA.2013.6632433},
    eventdate = {2013-09-09/2013-09-13},
    eventtitle = {International Conference on Electromagnetics in Advanced Applications (ICEAA)},
    faupublication = {yes},
    keywords = {cofired; Conductor edge; field simulation; fringed microstrip; inhomogeneous substrate; LTCC; porosification; reduction of permittivity; structural modeling},
    pages = {1189--1192},
    peerreviewed = {Yes},
    title = {Electromagnetic Analysis of Fringed Microstrip Lines on Porosified LTCC},
    type = {Konferenzschrift},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6632433&isnumber=6632166},
    venue = {Torino, Italy},
    }
  • [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, Torino, Italy, 2013. [Bibtex]
    @inproceedings{gardill2013e,
    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.},
    author = {Gardill, Markus and Schneider, J. and Oesterle, Florian and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060010},
    year = {2013},
    month = {09},
    day = {09},
    doi = {10.1109/APWC.2013.6624934},
    eventdate = {2013-09-09/2013-09-13},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Ultra-Wideband Small Antenna Subarray Module with Narrow Elevation Pattern},
    venue = {Torino, Italy},
    }
  • 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 (PIERS), Stockholm, Sweden, 2013, p. 1403. [Bibtex]
    @inproceedings{koelpin2013a,
    author = {Koelpin, Alexander and Lindner, Stefan and Mann, Sebastian and Barbon, Francesco and Linz, Sarah and Weigel, Robert},
    booktitle = {Progress In Electromagnetics Research Symposium (PIERS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060001},
    year = {2013},
    month = {08},
    day = {12},
    eventdate = {2013-08-12/2013-08-15},
    faupublication = {yes},
    pages = {1403},
    peerreviewed = {unknown},
    title = {Two-dimensional Angle-of-arrival Analysis by One Enhanced Six-port Structure},
    type = {Abstract zum Vortrag},
    venue = {Stockholm, Sweden},
    }
  • 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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059957},
    year = {2013},
    month = {07},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    pages = {36--46},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Tag, you're it},
    }
  • 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},
    booktitle = {2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060032},
    year = {2013},
    month = {07},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A Highly Sensitive Glucose Biosensor Based on a Microstrip Ring Resonator},
    }
  • [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, Newport Beach, 2013, pp. 22-24. [Bibtex]
    @inproceedings{grimminger2013,
    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.},
    author = {Grimminger, Florian and Kowalczyk, G. and Unterassinger, H. and Schwarzmeier, Andre and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE BioWireleSS},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059920},
    year = {2013},
    month = {07},
    doi = {10.1109/BIOWIRELESS.2014.6827732},
    faupublication = {yes},
    keywords = {Subthreshold; Asynchronouse; Event detector; Wireless sensor node},
    pages = {22--24},
    peerreviewed = {Yes},
    title = {Asynchronous Subthreshold CMOS Event Detector for Wireless BAN Sensor Nodes},
    venue = {Newport Beach},
    }
  • 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},
    booktitle = {2014 IEEE Topical Conference on Bio-medical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS2014)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060033},
    year = {2013},
    month = {07},
    faupublication = {yes},
    pages = {55--57},
    peerreviewed = {Yes},
    title = {A Microstrip Resonant Biosensor for Aqueous Glucose Detection in Microfluidic Medical Applications},
    }
  • [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), Osaka, Japan, 2013. [Bibtex]
    @inproceedings{hofmann2013d,
    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.},
    author = {Hofmann, Maximilian and Nehring, Johannes and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE Engineering in Medicine and Biology Conference (EMBC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059947},
    year = {2013},
    month = {07},
    doi = {10.1109/EMBC.2013.6610434},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Wideband Scalar Network Analyzer for Biomedical Dehydration Measurements},
    venue = {Osaka, Japan},
    }
  • 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, Seattle, WA, USA, 2013. [Bibtex]
    @inproceedings{nasr2013,
    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—},
    author = {Nasr, Ismail and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060019},
    year = {2013},
    month = {06},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Broadband Millimeter-Wave Receiver Front-Ends in Silicon-Germanium Technology for Multi-Band Communication Systems},
    venue = {Seattle, WA, USA},
    }
  • [DOI] 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, Seattle, WA, USA, 2013. [Bibtex]
    @inproceedings{oesterle2013,
    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.},
    author = {Oesterle, Florian and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059912},
    year = {2013},
    month = {06},
    doi = {10.1109/MWSYM.2013.6697701},
    faupublication = {yes},
    keywords = {Microelectromechanical Systems; Contactless Testing; Microphones; Mechanical Sensitivity; Microwave Interferometry; W-band},
    peerreviewed = {Yes},
    title = {A Novel, W-Band Microwave Based Contactless Test Method for Mechanical Sensitivity Analysis of MEMS},
    venue = {Seattle, WA, USA},
    }
  • [DOI] G. A. Guarin Aristizabal, 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, Seattle, WA, USA, 2013, pp. 1-3. [Bibtex]
    @inproceedings{guarin2013,
    author = {Guarin Aristizabal, Gustavo Adolfo and Hofmann, Maximilian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE MTT-S International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059954},
    year = {2013},
    month = {06},
    doi = {10.1109/MWSYM.2013.6697563},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Determination of sugar concentration in aqueous solutions using ultra-wideband microwave impedance spectroscopy},
    venue = {Seattle, WA, USA},
    }
  • [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 International Microwave Symposium, Seattle, WA, USA, 2013, pp. 1-4. [Bibtex]
    @inproceedings{lindner2013,
    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.},
    author = {Lindner, Stefan and Barbon, Francesco and Mann, Sebastian and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060041},
    year = {2013},
    month = {06},
    day = {02},
    doi = {10.1109/MWSYM.2013.6697581},
    eventdate = {2013-06-02/2013-06-07},
    faupublication = {yes},
    keywords = {distance measurement; radar interferometry; ;absolute position determination},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Dual Tone Approach for Unambiguous Six-Port Based Interferometric Distance Measurements},
    venue = {Seattle, WA, USA},
    }
  • [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, Darmstadt, 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},
    publisher = {IEEE},
    booktitle = {14th IEEE International Workshop on Signal Processing Advances in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060018},
    year = {2013},
    month = {06},
    day = {16},
    doi = {10.1109/SPAWC.2013.6612097},
    eventdate = {2013-06-16/2013-06-19},
    faupublication = {yes},
    pages = {485--489},
    peerreviewed = {unknown},
    title = {Measurement of Backscatter RFID-Transponders},
    venue = {Darmstadt},
    }
  • [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 Microwave Symposium Digest, Seattle, USA, 2013. [Bibtex]
    @inproceedings{carlowitz2013,
    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. © 2013 IEEE.},
    author = {Carlowitz, Christian and Esswein, Alexander and Weigel, Robert and Vossiek, Martin},
    language = {English},
    publisher = {Institute of Electrical and Electronics Engineers},
    booktitle = {IEEE MTT-S International Microwave Symposium Digest},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025723},
    year = {2013},
    month = {06},
    day = {02},
    doi = {10.1109/MWSYM.2013.6697569},
    eventdate = {2013-06-02/2013-06-07},
    eventtitle = {2013 IEEE MTT-S International Microwave Symposium Digest, MTT 2013},
    faupublication = {yes},
    issn = {0149-645X},
    journaltitle = {IEEE MTT-S International Microwave Symposium Digest},
    keywords = {Injection-locked oscillators; Receiver architectures; Signal sampling; Wideband communication},
    peerreviewed = {Yes},
    title = {Regenerative Sampling Self-Mixing Receiver: A Novel Concept for Low Complexity Phase Demodulation},
    type = {Konferenzschrift},
    venue = {Seattle, USA},
    }
  • [DOI] R. Agethen, S. 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, Seattle, WA, USA, 2013, pp. 1-3. [Bibtex]
    @inproceedings{agethen2013,
    author = {Agethen, Roman and Pour Mousavi, Seyed Mehran and Forstner, Hans-Peter and Wojnowski, Maciej and Pressel, Klaus and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE MTT-S international Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060027},
    year = {2013},
    month = {06},
    day = {02},
    doi = {10.1109/MWSYM.2013.6697731},
    eventdate = {2013-06-02/2013-06-07},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {60 GHz industrial radar systems in silicon-germanium technology},
    venue = {Seattle, WA, USA},
    }
  • [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 IEEE MTT-S International Microwave Symposium, Seattle, WA, USA, 2013, pp. 1-4. [Bibtex]
    @inproceedings{talai2013a,
    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.},
    author = {Talai, Armin and Steinhäußer, Frank and Schmid, Ulrich and Weigel, Robert and Bittner, Achim and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060004},
    year = {2013},
    month = {06},
    day = {02},
    doi = {10.1109/MWSYM.2013.6697583},
    eventdate = {2013-06-02/2013-06-07},
    faupublication = {yes},
    keywords = {Field simulation; LTCC; local reduction of permittivity; porosification; wet chemical etching; inhomogeneous substrate; permittivity gradient},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {A Finite 3D Field Simulation Method for Permittivity Gradient Implementation of a Novel Porosification Process in LTCC},
    venue = {Seattle, WA, USA},
    }
  • [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, Dresden, Germany, 2013. [Bibtex]
    @inproceedings{franchi2013b,
    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.},
    author = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE Vehicular Technology Society},
    booktitle = {5th IEEE International Symposium on Wireless Vehicular Communications - VTC Spring 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060012},
    year = {2013},
    month = {06},
    doi = {10.1109/WIVEC.2013.6698242},
    faupublication = {yes},
    keywords = {Software Defined Radio; Vehicular Wireless Communication; Wireless Automotive Sensor Networks; Hardware In-the-Loop; IEEE 802.11p; IEEE 802.11b; USRP; RadioHIL},
    peerreviewed = {unknown},
    title = {Radio Hardware In-the-Loop Emulation for Testing Vehicular Communication Systems},
    venue = {Dresden, Germany},
    }
  • [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 2013 IEEE MTT-S International Microwave Symposium Digest (IMS), Seattle, USA, 2013. [Bibtex]
    @inproceedings{hofmann2013c,
    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.},
    author = {Hofmann, Maximilian and Linz, Sarah and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    language = {English},
    booktitle = {2013 IEEE MTT-S International Microwave Symposium Digest (IMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059948},
    year = {2013},
    month = {06},
    doi = {10.1109/MWSYM.2013.6697658},
    eventtitle = {IEEE International Microwave Symposium},
    faupublication = {yes},
    isbn = {9781467361767},
    issn = {0149-645X},
    peerreviewed = {Yes},
    title = {A Multiband 2-Port VNA for Biomedical Applications based on two Six-Port-Junctions},
    venue = {Seattle, USA},
    }
  • [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), Dresden, 2013, pp. 1-5. [Bibtex]
    @inproceedings{sonner2013,
    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.},
    author = {Sonner, Daniel and Müller, Thomas and Duell, M. and Weigel, Robert},
    booktitle = {IEEE 77th Vehicular Technology Conference (VTC Spring)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060036},
    year = {2013},
    month = {06},
    doi = {10.1109/VTCSPRING.2013.6692535},
    faupublication = {yes},
    keywords = {active filters; amplitude modulation; broadcast communication; digital video broadcasting; electric vehicles; electromagnetic interference; filtering theory; interference suppression; frequency modulation},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {EMI Suppression Techniques for Broadcast Reception in Electric Vehicles},
    venue = {Dresden},
    }
  • [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, Grenoble, France, 2013. [Bibtex]
    @inproceedings{oesterle2013c,
    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.},
    author = {Oesterle, Florian and Fink, Franz and Dehe, Alfons and Kuhn, Harald and Weigel, Robert and Koelpin, Alexander},
    publisher = {SPIE},
    booktitle = {SPIE Microtechnologies, Smart Sensors, Actuators, and MEMS VI, Conference 8763},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059951},
    year = {2013},
    month = {05},
    doi = {10.1117/12.2016835},
    faupublication = {yes},
    keywords = {Inspection equipment; Manufacturing; Microelectromechanical systems; Silicon},
    peerreviewed = {Yes},
    title = {A Large Deflection Model of Silicon Membranes for Testing Intrinsic Stress of MEMS Microphones by Measuring Pull-In Voltage},
    venue = {Grenoble, France},
    volume = {8763},
    }
  • [DOI] 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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059991},
    year = {2013},
    month = {05},
    doi = {10.1109/TMTT.2013.2253792},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {5},
    pages = {2195--2204},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A 125-GHz permittivity sensor with read-out circuit in a 250-nm SiGe BiCMOS technology},
    volume = {61},
    }
  • 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, Gatineau, Canada, 2013, pp. 175-178. [Bibtex]
    @inproceedings{schwerthoeffer2013,
    author = {Schwerthöffer, Udo and Winter, M. and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Internation Symposium on Medical Measurement and Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059970},
    year = {2013},
    month = {05},
    faupublication = {yes},
    pages = {175--178},
    peerreviewed = {Yes},
    title = {Concentration detection in water-glucose mixtures for medical applications using ultrasonic velocity measurements},
    venue = {Gatineau, Canada},
    }
  • J. A. 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, Melbourne, Australia, 2013. [Bibtex]
    @inproceedings{chicharro2013,
    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.},
    author = {Chicharro, José Antonio and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    booktitle = {Asia-Pacific International Symposium and Exhibition on Electromagnetic Compatibility},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059960},
    year = {2013},
    month = {05},
    day = {20},
    eventdate = {2013-05-20/2013-05-23},
    faupublication = {yes},
    keywords = {Bipolar; Integrated circuits; broadband amplifier; low-impedance LNA; EMR measurements; multi-decade},
    peerreviewed = {Yes},
    title = {Low Impedance Multi-Decade Integrated Amplifier for EMR Measurements in Fully Electric Vehicles},
    venue = {Melbourne, Australia},
    }
  • [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, Beijing, China, 2013. [Bibtex]
    @inproceedings{hamouda2013a,
    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.},
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {IEEE International Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060002},
    year = {2013},
    month = {05},
    doi = {10.1109/ISCAS.2013.6572031},
    faupublication = {yes},
    keywords = {ultra wide band; delay; m-sequence},
    peerreviewed = {Yes},
    title = {A Compact Analog Active Time delay Line using SiGe BiCMOS Technology},
    venue = {Beijing, China},
    }
  • [DOI] 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, Orlando, Florida, USA, 2013. [Bibtex]
    @inproceedings{zohny2013,
    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.},
    author = {Zohny, Amr and Rascher, Jochen and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {International Conference on Wireless Information Technology and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059987},
    year = {2013},
    month = {04},
    day = {07},
    doi = {10.1109/WAMICON.2013.6572741},
    eventdate = {2013-04-07/2013-04-09},
    faupublication = {yes},
    keywords = {Power amplifier; Power-added efficiency; linearity; CMOS; long-term evolution; peak-to-average power ration},
    peerreviewed = {Yes},
    title = {A Comparison of State-of-the-Art Efficiency Enhancement Techniques of Fully Integrated CMOS Power Amplifiers for Handset LTE Applications},
    venue = {Orlando, Florida, USA},
    }
  • [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 14th Annual Wireless and Microwave Technology Conference (WAMICON), Orlando, FL, USA, 2013. [Bibtex]
    @inproceedings{rascher2013,
    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.},
    author = {Rascher, Jochen and Zohny, Amr and Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {14th Annual Wireless and Microwave Technology Conference (WAMICON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060030},
    year = {2013},
    month = {04},
    day = {07},
    doi = {10.1109/WAMICON.2013.6572754},
    eventdate = {2013-04-07/2013-04-09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Comparative Overview of High Power Handling CMOS Switches and their Recent Applications in RF Front-Ends},
    venue = {Orlando, FL, USA},
    }
  • R. Weigel, G. Fischer, M. Hofmann, and J. Nehring, "Design und Synthese breitbandiger Richtkoppler fuer die Vektorielle Netzwerkanalyse" in RADCOM, Hamburg, 2013. [Bibtex]
    @inproceedings{weigel2013,
    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.},
    author = {Weigel, Robert and Fischer, Georg and Hofmann, Maximilian and Nehring, Johannes},
    booktitle = {RADCOM},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059913},
    year = {2013},
    month = {04},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Design und Synthese breitbandiger Richtkoppler fuer die Vektorielle Netzwerkanalyse},
    venue = {Hamburg},
    }
  • A. Talai, R. Weigel, and A. Koelpin, "Electromagnetic Field Analysis of Porosified LTCC" in Computer Simulation Technology - European User Conference, Stuttgart, 2013, pp. 1-9. [Bibtex]
    @inproceedings{talai2013,
    author = {Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    publisher = {CST Computer Simulation Technology AG},
    booktitle = {Computer Simulation Technology - European User Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060040},
    year = {2013},
    month = {04},
    faupublication = {yes},
    pages = {1--9},
    peerreviewed = {unknown},
    title = {Electromagnetic Field Analysis of Porosified LTCC},
    url = {https://www.cst.com/Content/Events/downloads/euc2013/3-1-3_CST_EUC.pdf},
    venue = {Stuttgart},
    }
  • M. Kuba, A. Oeder, K. Ronge, and R. Weigel, "Automatische Erkennung von Kommunikationsstandards im Sub-GHz-Bereich" in RADCOM 2013, Hamburg, Germany, 2013. [Bibtex]
    @inproceedings{kuba2013,
    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.},
    author = {Kuba, Matthias and Oeder, Andreas and Ronge, Karlheinz and Weigel, Robert},
    booktitle = {RADCOM 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059955},
    year = {2013},
    month = {04},
    day = {24},
    eventdate = {2013-04-24/2013-04-25},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Automatische Erkennung von Kommunikationsstandards im Sub-GHz-Bereich},
    venue = {Hamburg, Germany},
    }
  • S. 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), Sweden, Sweden, 2013. [Bibtex]
    @inproceedings{pourmousavi2013,
    author = {Pour Mousavi, Seyed Mehran and Wojnowski, Maciej and Roehr, S. and Sommer, Grit and Weigel, Robert},
    booktitle = {European Conference of Antennas and Propagation (EuCAP)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059983},
    year = {2013},
    month = {04},
    day = {08},
    eventdate = {2013-04-08/2013-04-12},
    faupublication = {yes},
    peerreviewed = {No},
    title = {The impact of embedded wafer level BGA package on the antenna hemispherical lens characterization for wireless applications at 61 GHz},
    venue = {Sweden, Sweden},
    }
  • N. Franchi, G. Fischer, and R. Weigel, "Design von adaptiven Automobil-Funksystemen mittels Rapid-SDR-Prototyping" in RADCOM 2013, Hamburg, DE, 2013. [Bibtex]
    @inproceedings{franchi2013a,
    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.},
    author = {Franchi, Norman and Fischer, Georg and Weigel, Robert},
    booktitle = {RADCOM 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060011},
    year = {2013},
    month = {04},
    day = {24},
    eventdate = {2013-04-24/2013-04-25},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Design von adaptiven Automobil-Funksystemen mittels Rapid-SDR-Prototyping},
    venue = {Hamburg, DE},
    }
  • C. Blümm, A. Elefsiniotis, C. Heller, and R. Weigel, "Channel equalization for OFDM communication on a runtime-flexible SDR platform" in RADCOM, Hamburg, 2013. [Bibtex]
    @inproceedings{bluemm2013,
    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.},
    author = {Blümm, Christian and Elefsiniotis, Alexandros and Heller, Christoph and Weigel, Robert},
    booktitle = {RADCOM},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060037},
    year = {2013},
    month = {04},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Channel equalization for OFDM communication on a runtime-flexible SDR platform},
    venue = {Hamburg},
    }
  • 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, Stuttgart, Germany, 2013. [Bibtex]
    @inproceedings{gardill2013d,
    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.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {CST European User Group Meeting 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060006},
    year = {2013},
    month = {04},
    day = {23},
    eventdate = {2013-04-23/2013-04-25},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Receiving Mode CST MWS – Matlab Co-Simulations for Time and Frequency Domain UWB Small Antenna Array Characterization},
    venue = {Stuttgart, Germany},
    }
  • 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, Gothenburg, Sweden, 2013. [Bibtex]
    @inproceedings{gardill2013c,
    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.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {European Conference on Antennas and Propagation},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060005},
    year = {2013},
    month = {04},
    day = {08},
    eventdate = {2013-04-08/2013-04-12},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Design of an Ultra-Wideband Monocone Circular Antenna Array for Vehicle-Integrated Industrial Local Positioning Applications},
    venue = {Gothenburg, Sweden},
    }
  • 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, Monterey, CA, USA, 2013. [Bibtex]
    @inproceedings{gardill2013b,
    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.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Applied Computational Electromagnetics Society Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060008},
    year = {2013},
    month = {03},
    day = {24},
    eventdate = {2013-03-24/2013-03-28},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Receiving Mode Simulations for Ultra-Wideband Characterization of Small Antenna Arrays and a Novel Look on Mutual Coupling},
    venue = {Monterey, CA, USA},
    }
  • [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,
    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.},
    author = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Mann, Sebastian and Hofmann, Maximilian and Duda, Alexander and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060025},
    year = {2013},
    month = {03},
    doi = {10.1109/TMTT.2013.2247055},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {radars; radar systems; bio effects and med. appl. of RF/Microwave; biomedical applications; biomedical sensors},
    number = {5},
    pages = {2093--2100},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Six-Port Radar Sensor for Remote Respiration Rate and Heartbeat Vital-Sign Monitoring},
    volume = {61},
    }
  • 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, Aachen, Germany, 2013. [Bibtex]
    @inproceedings{maser2013,
    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.},
    author = {Maser, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {VDE Verlag GmbH},
    booktitle = {Analog 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059953},
    year = {2013},
    month = {03},
    day = {04},
    eventdate = {2013-03-04/2013-03-06},
    faupublication = {yes},
    keywords = {UWB; Local Positioning; VCO; Tuning Linearization},
    peerreviewed = {Yes},
    title = {Ein integrierter SiGe Bipolar VCO mit linearisierter Abstimmkennlinie und großem Abstimmbereich für UWB FMCW Nahbereichsortung},
    venue = {Aachen, Germany},
    }
  • S. Glock, G. Fischer, R. Weigel, and T. Ußmüller, "Modelling and Simulation of the Energy Efficiency of Heterogeneous Integrated Systems at System Level" in ITG-Fb. 239: Analog 2013, Aachen, 2013, pp. 1-6. [Bibtex]
    @inproceedings{glock2013a,
    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.},
    author = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {ITG-Fb. 239: Analog 2013},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059918},
    year = {2013},
    month = {03},
    day = {04},
    eventdate = {2013-03-04/2013-03-06},
    eventtitle = {13. ITG/GMM-Fachtagung Analog 2013},
    faupublication = {yes},
    isbn = {9783800734672},
    pages = {1--6},
    peerreviewed = {No},
    title = {Modelling and Simulation of the Energy Efficiency of Heterogeneous Integrated Systems at System Level},
    venue = {Aachen},
    }
  • [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, Intech, 2013.. [Bibtex]
    @book{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, Mohamed and Kraemer, Rolf and Scheytt, Christoph and Borokhovych, Yevgen},
    publisher = {Intech},
    booktitle = {Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059972},
    year = {2013},
    month = {03},
    doi = {10.5772/54987},
    faupublication = {yes},
    pages = {369--438},
    peerreviewed = {Yes},
    title = {HaLoS - Integrated RF-Hardware Components for Ultra-Wideband Localization and Sensing},
    type = {Band aus einer Reihe},
    }
  • [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,
    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).},
    author = {Hofmann, Maximilian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059945},
    year = {2013},
    month = {02},
    doi = {10.1109/TMTT.2013.2250516},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {5},
    pages = {2195--2204},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Microwave-Based Noninvasive Concentration Measurements for Biomedical Applications},
    volume = {61},
    }
  • [DOI] A. Esswein, R. Weigel, C. Carlowitz, and M. Vossiek, Concepts and Components for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems, 1 ed., Intech, 2013.. [Bibtex]
    @book{esswein2013,
    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)".},
    author = {Esswein, Alexander and Weigel, Robert and Carlowitz, Christian and Vossiek, Martin},
    language = {English},
    publisher = {Intech},
    booktitle = {Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059930},
    year = {2013},
    month = {02},
    doi = {10.5772/2648},
    edition = {1},
    faupublication = {yes},
    isbn = {9789535109365},
    keywords = {Ultra Wideband},
    pages = {343--368},
    peerreviewed = {Yes},
    title = {Concepts and Components for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems},
    type = {Band aus einer Reihe},
    url = {http://www.intechopen.com/books/ultra-wideband-radio-technologies-for-communications-localization-and-sensor-applications},
    }
  • 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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059935},
    year = {2013},
    month = {02},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    number = {2},
    pages = {948--959},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Large-signal measurements and non-linear characterization of an analog frontend for passive UHF CMOS RFID transponders},
    volume = {61},
    }
  • N. Franchi, F. Spiteller, and R. Weigel, "Automotive meets Adaptive Wireless Communication" in 4. GMM-Fachtagung Automotive meets Electronics (AmE), Dortmund, Germany, 2013. [Bibtex]
    @inproceedings{franchi2013,
    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.},
    author = {Franchi, Norman and Spiteller, Florian and Weigel, Robert},
    publisher = {VDE-Verlag},
    booktitle = {4. GMM-Fachtagung Automotive meets Electronics (AmE)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059990},
    year = {2013},
    month = {02},
    day = {19},
    eventdate = {2013-02-19/2013-02-20},
    faupublication = {yes},
    keywords = {Software Defined Radio; Wireless Vehicular Communication Systems; Rapid-SDR-Prototyping; IEEE 802.11p; IEEE 802.11b; USRP},
    peerreviewed = {No},
    title = {Automotive meets Adaptive Wireless Communication},
    venue = {Dortmund, Germany},
    }
  • [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, 2013. [Bibtex]
    @article{hartmann2012,
    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.},
    author = {Hartmann, Alexander and Strzoda, Rainer and Weigel, Robert},
    publisher = {Springer-Verlag},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059809},
    year = {2013},
    month = {02},
    doi = {10.1007/S00340-012-5048-Z},
    faupublication = {yes},
    issn = {0946-2171},
    journaltitle = {Applied Physics B-Lasers and Optics},
    number = {2},
    pages = {195--202},
    peerreviewed = {Yes},
    shortjournal = {APPL PHYS B-LASERS O},
    title = {Automatic identification of wavelength range of VCSEL-based gas sensor using ratios of gas absorption lines},
    volume = {110},
    }
  • [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), Santa Clara, CA, 2013, pp. 28-30. [Bibtex]
    @inproceedings{farabegoli2013,
    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.},
    author = {Farabegoli, Alessio and Sogl, Bernhard and Müller, Jan-Erik and Weigel, Robert},
    booktitle = {IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060016},
    year = {2013},
    month = {01},
    doi = {10.1109/PAWR.2013.6490178},
    faupublication = {yes},
    keywords = {power amplifiers; cross-correlation; fractional delay mismatch estimation; mobile application; modular approach; power amplifier; reduced sampling rate; time alignment compensation},
    pages = {28--30},
    peerreviewed = {Yes},
    title = {A novel, fast, and precise Method to perform Time Alignment Estimation and Compensation},
    venue = {Santa Clara, CA},
    }
  • [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), Santa Clara, CA, USA, 2013, pp. 142-144. [Bibtex]
    @inproceedings{bakalski2013,
    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.},
    author = {Bakalski, Winfried and Thomas, Anthony and Weigel, Robert},
    booktitle = {IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059941},
    year = {2013},
    month = {01},
    doi = {10.1109/PAWR.2013.6490216},
    faupublication = {yes},
    keywords = {CMOS integrated circuits; UHF antennas; UHF integrated circuits; impedance matching; microwave switches; transformer windings; GSM band; Infineon bulk-CMOS RF switch process},
    pages = {142--144},
    peerreviewed = {Yes},
    title = {A fully integrated bulk-CMOS switch based tunable transformer for RF and antenna matching},
    venue = {Santa Clara, CA, USA},
    }
  • [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, Austin, TX, USA, 2013, pp. 112-114. [Bibtex]
    @inproceedings{gardill2013a,
    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.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060007},
    year = {2013},
    month = {01},
    day = {20},
    doi = {10.1109/RWS.2013.6486658},
    eventdate = {2013-01-20/2013-01-23},
    faupublication = {yes},
    pages = {112--114},
    peerreviewed = {Yes},
    title = {Design of a Robust and Low-Cost Monocone Antenna Element for Use in Vehicle Roof-Mounted Antenna Arrays},
    venue = {Austin, TX, USA},
    }
  • [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, Austin, TX, USA, 2013. [Bibtex]
    @inproceedings{glock2013,
    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.},
    author = {Glock, Stefan and Sogl, Bernhard and Vizaretta, P. and Ußmüller, Thomas and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059916},
    year = {2013},
    month = {01},
    doi = {10.1109/PAWR.2013.6490191},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {An Extension of Power Amplifier Behavioral Models for Optimizing Battery Current at System Level},
    venue = {Austin, TX, USA},
    }
  • [DOI] M. Hofmann, A. Bauch, R. Weigel, G. Fischer, and D. Kissinger, "A Microwave VNA for Biomedical In-line Concentration Measurements" in BioWireless Conference, Austin, TX, 2013. [Bibtex]
    @inproceedings{hofmann2013a,
    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.},
    author = {Hofmann, Maximilian and Bauch, Andreas and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {BioWireless Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059946},
    year = {2013},
    month = {01},
    doi = {10.1109/BIOWIRELESS.2013.6613670},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A Microwave VNA for Biomedical In-line Concentration Measurements},
    venue = {Austin, TX},
    }
  • [DOI] D. Kissinger, B. Lämmle, I. Nasr, and R. Weigel, "Millimeter-wave integrated reflectometer architectures for biomedical applications" in IEEE Topical Conference on Biomedical Wireless Technologies, Networks and Sensing Systems, Austin, TX, USA, 2013, pp. 1-3. [Bibtex]
    @inproceedings{kissinger2013,
    author = {Kissinger, Dietmar and Lämmle, Benjamin and Nasr, Ismail and Weigel, Robert},
    booktitle = {IEEE Topical Conference on Biomedical Wireless Technologies, Networks and Sensing Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059928},
    year = {2013},
    month = {01},
    doi = {10.1109/BIOWIRELESS.2013.6613675},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Millimeter-wave integrated reflectometer architectures for biomedical applications},
    venue = {Austin, TX, USA},
    }
  • [DOI] 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, Austin, TX, USA, 2013, pp. 129-131. [Bibtex]
    @inproceedings{laemmle2013,
    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.},
    author = {Lämmle, Benjamin and Schmalz, Klaus and Borngraeber, J. and Scheytt, Christoph and Weigel, Robert and Koelpin, Alexander and Kissinger, Dietmar},
    booktitle = {2013 IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059982},
    year = {2013},
    month = {01},
    day = {21},
    doi = {10.1109/SIRF.2013.6489455},
    eventdate = {2013-01-21/2013-01-23},
    faupublication = {yes},
    pages = {129--131},
    peerreviewed = {Yes},
    title = {A fully integrated 120-GHz six-port receiver front-end in a 130-nm SiGe BiCMOS technology},
    venue = {Austin, TX, USA},
    }
  • [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 : Kleinheubacher Berichte, vol. 11, 2013. [Bibtex]
    @article{gardill2013,
    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.},
    author = {Gardill, Markus and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {Copernicus},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060028},
    year = {2013},
    doi = {10.5194/ARS-11-297-2013},
    faupublication = {yes},
    issn = {1684-9965},
    journaltitle = {Advances in Radio Science : Kleinheubacher Berichte},
    peerreviewed = {Yes},
    title = {Single-Element Based Ultra-Wideband Antenna Array Concepts for Wireless High-Precision 2D Local Positioning},
    volume = {11},
    }
  • [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, vol. 2, iss. 4, pp. 1122-1135, 2013. [Bibtex]
    @article{jung2013,
    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.},
    author = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {MDPI AG},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059929},
    year = {2013},
    doi = {10.3390/IJGI2041122},
    faupublication = {yes},
    issn = {2220-9964},
    journaltitle = {ISPRS International Journal of Geo-Information},
    keywords = {fmcw; tdoa; ad hoc networking; pll; synthesizer; tspc; frequency divider},
    number = {4},
    pages = {1122--1135},
    peerreviewed = {Yes},
    title = {Low Power 24 GHz ad hoc Networking System Based on TDOA for Indoor Localization},
    volume = {2},
    }
  • C. Carlowitz, A. Esswein, R. Weigel, and M. Vossiek, "Concepts for Generation of Angle Modulated mm-Wave UWB Signals for Communication and Ranging" in IMS 2013 Workshop on RFICs/MMICs and Their Professional Wireless Sensing Applications, Seattle, USA, 2013. [Bibtex]
    @inproceedings{carlowitz2013a,
    author = {Carlowitz, Christian and Esswein, Alexander and Weigel, Robert and Vossiek, Martin},
    booktitle = {IMS 2013 Workshop on RFICs/MMICs and Their Professional Wireless Sensing Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025702},
    year = {2013},
    faupublication = {yes},
    title = {Concepts for Generation of Angle Modulated mm-Wave UWB Signals for Communication and Ranging},
    venue = {Seattle, USA},
    }
  • [DOI] A. Esswein, C. Carlowitz, R. Weigel, and M. Vossiek, "Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications," in Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications, InTech, 2013, pp. 343-368. [Bibtex]
    @inbook{esswein2013b,
    author = {Esswein, Alexander and Carlowitz, Christian and Weigel, Robert and Vossiek, Martin},
    publisher = {InTech},
    booktitle = {Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1029173},
    year = {2013},
    doi = {10.5772/55082},
    faupublication = {yes},
    pages = {343--368},
    peerreviewed = {Yes},
    title = {Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications},
    type = {Review Article},
    }
  • [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, Torino, Italy, 2013, pp. 818-821. [Bibtex]
    @inproceedings{mann2013a,
    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.},
    author = {Mann, Sebastian and Vinci, Gabor and Lindner, Stefan and Linz, Sarah and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059986},
    year = {2013},
    doi = {10.1109/APWC.2013.6624910},
    faupublication = {yes},
    keywords = {Six-Port; Radar Coupler},
    pages = {818--821},
    peerreviewed = {Yes},
    title = {61 GHz Six-Port Radar Frontend for High Accuracy Range Detection Applications},
    venue = {Torino, Italy},
    }

2012

  • L. Maurer, C. Ruppel, R. Weigel, and R. Vazny, "Future of SAW/BAW Devices in Mobile Radio" in International Symposium on Acoustic Wave Devices, Chiba, JP, 2012, pp. 61-64. [Bibtex]
    @inproceedings{maurer2012,
    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.},
    author = {Maurer, Linus and Ruppel, Clemens and Weigel, Robert and Vazny, Rastislav},
    booktitle = {International Symposium on Acoustic Wave Devices},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059738},
    year = {2012},
    month = {12},
    faupublication = {yes},
    pages = {61--64},
    peerreviewed = {unknown},
    title = {Future of SAW/BAW Devices in Mobile Radio},
    venue = {Chiba, JP},
    }
  • [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, Anaheim, CA, 2012, pp. 3104-3109. [Bibtex]
    @inproceedings{kuba2012a,
    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.},
    author = {Kuba, Matthias and Ronge, Karlheinz and Weigel, Robert},
    booktitle = {IEEE Global Communications Conference (GLOBECOM), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059780},
    year = {2012},
    month = {12},
    doi = {10.1109/GLOCOM.2012.6503591},
    faupublication = {yes},
    keywords = {Monte Carlo methods; error statistics; feature extraction; pattern classification; software radio; statistical analysis; home automation applications; software defined radio platform},
    pages = {3104--3109},
    peerreviewed = {unknown},
    title = {Development and Implementation of a Feature-Based Automatic Classification Algorithm for Communication Standards in the 868 MHz Band},
    venue = {Anaheim, CA},
    }
  • [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,
    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).},
    author = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059746},
    year = {2012},
    month = {12},
    doi = {10.1109/MMM.2012.2216707},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {7},
    pages = {14--21},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Depth and Rate of the Save},
    volume = {13},
    }
  • [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, Kaohsiung, Taiwan, 2012. [Bibtex]
    @inproceedings{zohny2012b,
    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.},
    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},
    publisher = {IEEE},
    booktitle = {Asia-Pacific Microwave Conference - APMC 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059753},
    year = {2012},
    month = {12},
    doi = {10.1109/APMC.2012.6421641},
    faupublication = {yes},
    keywords = {Power Amplifier; Linearity; ACPR; WCDMA; Distortion; Harmonic Balance},
    peerreviewed = {unknown},
    title = {Time-Efficient Adjacent Channel Power Ratio Simulation utilizing Overlap-add Signal Decomposition for UMTS Power Amplifiers},
    venue = {Kaohsiung, Taiwan},
    }
  • [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), Singapore, SG, 2012, pp. 99-102. [Bibtex]
    @inproceedings{seler2012,
    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.},
    author = {Seler, Ernst and Wojnowski, Maciej and Sommer, Grit and Weigel, Robert},
    booktitle = {IEEE 14th Electronics Packaging Technology Conference (EPTC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059736},
    year = {2012},
    month = {12},
    doi = {10.1109/EPTC.2012.6507059},
    faupublication = {yes},
    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},
    pages = {99--102},
    peerreviewed = {unknown},
    title = {Comparative Analysis of High-Frequency Transitions in Embedded Wafer Level BGA (eWLB) and Quad Flat no Leads (VQFN) Packages},
    venue = {Singapore, SG},
    }
  • [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, Wailea, HI, 2012. [Bibtex]
    @inproceedings{ussmueller2012a,
    author = {Ußmüller, Thomas and Brenk, Daniel and Essel, Jochen and Heidrich, Jürgen and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Conference on Wireless Information Technologies and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059819},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417725},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Roundtrip-Time-of-Flight Based Localization of Passive Multi-Standard RFID-Tags},
    venue = {Wailea, HI},
    }
  • [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,
    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.},
    author = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059791},
    year = {2012},
    month = {11},
    doi = {10.1109/MMM.2012.2216710},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {Automation; Displacement measurement; Feedback; Industrial plants; Machinery; Position measurement; Robot sensing systems; Sensors; Tracking; Six-Port},
    number = {7},
    pages = {41--49},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Promise of a Better Position},
    volume = {13},
    }
  • [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, Hawaii, USA, 2012. [Bibtex]
    @inproceedings{zohny2012a,
    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.},
    author = {Zohny, Amr and Rascher, Jochen and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {IEEE International Conference on Wireless Information Technology and Systems - ICWITS 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059752},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417770},
    faupublication = {yes},
    keywords = {Power Amplifier; Linearity; PAE; CMOS; Predistortion},
    peerreviewed = {unknown},
    title = {A Classification and Comparative Overview of State-of-the-Art Analog Linearization Techniques for Integrated CMOS Power Amplifiers},
    venue = {Hawaii, USA},
    }
  • [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, Maui, USA, 2012. [Bibtex]
    @inproceedings{schroeter2012a,
    author = {Schröter, Simon and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE International Conference on Wireless Information Technology and Systems (ICWITS), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059709},
    year = {2012},
    month = {11},
    doi = {10.1109/ICWITS.2012.6417806},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Beamsteering for the Uplink of UMTS using Transmit Power Control Bits to iteratively determine the Antenna Weights},
    venue = {Maui, USA},
    }
  • [DOI] G. Dehm-Andone, R. Mzyk, F. Langmann, 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, Potsdam, Germany, 2012, pp. 1-4. [Bibtex]
    @inproceedings{dehm-andone2012,
    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.},
    author = {Dehm-Andone, Gunther and Mzyk, Raphael and Langmann, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {International Symposium on Signals, Systems and Electronics 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059726},
    year = {2012},
    month = {10},
    doi = {10.1109/ISSSE.2012.6374312},
    faupublication = {yes},
    keywords = {Front-End; Filter design; RF; Filter bank; IF filter; Design aspects},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Filter Design Aspects in Analog Receiver Front-Ends for Frequency Scanning Applications},
    venue = {Potsdam, Germany},
    }
  • 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 42nd European Microwave Conference (EuMC), Amsterdam, Netherlands, 2012, pp. 896-899. [Bibtex]
    @inproceedings{lindner2012a,
    author = {Lindner, Stefan and Barbon, Francesco and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    booktitle = {42nd European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060382},
    year = {2012},
    month = {10},
    day = {29},
    eventdate = {2012-10-29/2012-10-01},
    faupublication = {yes},
    isbn = {9781467322157},
    pages = {896--899},
    peerreviewed = {Yes},
    title = {Initial Calibration Procedure of a Six-Port Receiver System for Complex Data Reception},
    url = {http://ieeexplore.ieee.org/document/6459216/},
    venue = {Amsterdam, Netherlands},
    }
  • [DOI] A. Radwan, 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, Portland, OR, 2012, pp. 72-75. [Bibtex]
    @inproceedings{gharib2012,
    author = {Radwan, Ahmed and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Bipolar/BiCMOS Technology and Devices Meeting},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059731},
    year = {2012},
    month = {10},
    doi = {10.1109/BCTM.2012.6352612},
    faupublication = {yes},
    pages = {72--75},
    peerreviewed = {unknown},
    title = {A broadband 1.33 THz GBP 120-mW common-collector feedback amplifier in SiGe technology},
    venue = {Portland, OR},
    }
  • 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), Amsterdam, Netherlands, 2012, pp. 570-573. [Bibtex]
    @inproceedings{lindner2012,
    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.},
    author = {Lindner, Stefan and Barbon, Francesco and Vinci, Gabor and Weigel, Robert and Koelpin, Alexander},
    booktitle = {9th European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059906},
    year = {2012},
    month = {10},
    day = {29},
    eventdate = {2012-10-29/2012-11-01},
    faupublication = {yes},
    keywords = {calibration; demodulation; radio receivers; signal reconstruction; baseband voltage digitization; binary data reconstruction; calibration procedure; complex data reception; constellation diagram; data symbol correction},
    pages = {570--573},
    peerreviewed = {Yes},
    title = {Initial Calibration Procedure of a Six-port Receiver System for Complex Data Reception},
    venue = {Amsterdam, Netherlands},
    }
  • [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), Potsdam, Germany, 2012, pp. 1-5. [Bibtex]
    @inproceedings{ferizi2012b,
    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.},
    author = {Ferizi, Alban and Baust, Philipp and Jung, Melanie and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {International Symposium on Signals, Systems, and Electronics (ISSSE)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059785},
    year = {2012},
    month = {10},
    doi = {10.1109/ISSSE.2012.6374292},
    faupublication = {yes},
    keywords = {Application specific integrated circuits,Baseband,Hardware,Radar,Random access memory,Wireless communication,Wireless sensor networks},
    pages = {1--5},
    peerreviewed = {unknown},
    title = {An area-efficient 130 nm CMOS baseband processing unit for 24 GHz FMCW radar positioning},
    venue = {Potsdam, Germany},
    }
  • 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, Amsterdam, 2012, pp. 508-511. [Bibtex]
    @inproceedings{jung2012a,
    author = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {The European Microwave Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059804},
    year = {2012},
    month = {10},
    faupublication = {yes},
    isbn = {9782874870262},
    pages = {508--511},
    peerreviewed = {unknown},
    title = {A 10 GHz Low-Power Multi-Modulus Frequency Divider using Extended True Single-Phase Clock (E-TSPC) Logic},
    venue = {Amsterdam},
    }
  • 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), Amsterdam, NL, 2012, pp. 262-265. [Bibtex]
    @inproceedings{kaiser2012,
    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.},
    author = {Kaiser, Markus and Hüttner, Jörg and Ziroff, Andreas and Weigel, Robert},
    booktitle = {9th European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059795},
    year = {2012},
    month = {10},
    faupublication = {yes},
    isbn = {9781467324717},
    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},
    pages = {262--265},
    peerreviewed = {unknown},
    title = {A High Accurarcy Post-Synchronization Method for Secondary Radar Systems},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6450618},
    venue = {Amsterdam, NL},
    }
  • [DOI] L. M. Reuter, R. Weigel, G. Fischer, and A. Schwarzmeier, "Energy budget in mobile health assistance systems" in BMT 2012, 46. DGBMT Jahrestagung, Jena, DE, 2012. [Bibtex]
    @inproceedings{reuter2012b,
    author = {Reuter, Lukas Michael and Weigel, Robert and Fischer, Georg and Schwarzmeier, Andre},
    booktitle = {BMT 2012, 46. DGBMT Jahrestagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059902},
    year = {2012},
    month = {09},
    doi = {10.1515/BMT-2012-4038},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Energy budget in mobile health assistance systems},
    venue = {Jena, DE},
    volume = {57},
    }
  • [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, Cape Town, South Africa, 2012. [Bibtex]
    @inproceedings{hein2012,
    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.},
    author = {Hein, Matthias and Helbig, Marko and Kmec, Martin and Sachs, Jürgen and Scotto di Clemente, Francesco and Stephan, Ralph and Hamouda, Mohamed and Ußmüller, Thomas and Weigel, Robert and Robens, Markus and Wunderlich, Ralf and Heinen, Stefan},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059735},
    year = {2012},
    month = {09},
    doi = {10.1109/APWC.2012.6324920},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ultra-wideband active array imaging for biomedical diagnostics},
    venue = {Cape Town, South Africa},
    }
  • 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, Kleinheubach, DE, 2012. [Bibtex]
    @inproceedings{kuehn2012,
    author = {Kuehn, M. and John, Werner and Weigel, Robert},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059815},
    year = {2012},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Validierung einer Messmethode zur Erfassung der magnetischen Schirmdaempfung eines Gehaeuses aus Drahtgeflecht und Vergleich mit einem analytischen Modell},
    venue = {Kleinheubach, DE},
    }
  • R. Weigel, A. Koelpin, G. Vinci, S. Lindner, and F. Barbon, "High Accuracy Industrial Positioning Sensors Based on Six-Port Technology" in Kleinheubacher Tagung, Miltenberg, 2012. [Bibtex]
    @inproceedings{weigel2012c,
    author = {Weigel, Robert and Koelpin, Alexander and Vinci, Gabor and Lindner, Stefan and Barbon, Francesco},
    publisher = {URSI},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059723},
    year = {2012},
    month = {09},
    day = {24},
    eventdate = {2012-09-24/2012-09-26},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {High Accuracy Industrial Positioning Sensors Based on Six-Port Technology},
    venue = {Miltenberg},
    }
  • [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), Grenoble, 2012, pp. 29-32. [Bibtex]
    @inproceedings{jung2012,
    author = {Jung, Melanie and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {International Semiconductor Conference Dresden - Grenoble (ISCDG)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059721},
    year = {2012},
    month = {09},
    doi = {10.1109/ISCDG.2012.6359997},
    faupublication = {yes},
    isbn = {9781467317177},
    pages = {29--32},
    peerreviewed = {unknown},
    title = {A CMOS divider family for high frequency wireless localization systems},
    venue = {Grenoble},
    }
  • [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,
    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.},
    author = {Lämmle, Benjamin and Vinci, Gabor and Maurer, Linus and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059807},
    year = {2012},
    month = {09},
    doi = {10.1109/JSSC.2012.2201271},
    faupublication = {yes},
    issn = {0018-9200},
    journaltitle = {IEEE Journal of Solid-State Circuits},
    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},
    number = {9},
    pages = {1966--1973},
    peerreviewed = {Yes},
    shortjournal = {IEEE J SOLID-ST CIRC},
    title = {A 77-GHz Six-Port Receiver Front-End for High-Precision Angle-of-Arrival Detection},
    volume = {47},
    }
  • [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, Grenoble, 2012, pp. 151-153. [Bibtex]
    @inproceedings{grimminger2012,
    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.},
    author = {Grimminger, Florian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {International Semiconductor Conference Dresden Grenoble},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059713},
    year = {2012},
    month = {09},
    doi = {10.1109/ISCDG.2012.6360033},
    faupublication = {yes},
    pages = {151--153},
    peerreviewed = {unknown},
    title = {Optimum Transistor Sizing for Low-Power Subthreshold Standard Cell Designs},
    venue = {Grenoble},
    }
  • [DOI] C. Carlowitz, A. Esswein, R. Weigel, and M. Vossiek, "Synthesis of Pulsed Frequency Modulated Ultra Wideband Radar Signals Based on Stepped Phase Shifting" in Proceedings - IEEE International Conference on Ultra-Wideband, Syracuse, USA, 2012, pp. 343-346. [Bibtex]
    @inproceedings{carlowitz2012a,
    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. © 2012 IEEE.},
    author = {Carlowitz, Christian and Esswein, Alexander and Weigel, Robert and Vossiek, Martin},
    booktitle = {Proceedings - IEEE International Conference on Ultra-Wideband},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025354},
    year = {2012},
    month = {09},
    day = {17},
    doi = {10.1109/ICUWB.2012.6340471},
    eventdate = {2012-09-17/2012-09-20},
    eventtitle = {2012 IEEE International Conference on Ultra-Wideband, ICUWB 2012},
    faupublication = {yes},
    issn = {2162-6588},
    keywords = {Injection locked oscillators; radar; signal sampling; transponders; ultra wideband technology},
    pages = {343--346},
    peerreviewed = {Yes},
    title = {Synthesis of Pulsed Frequency Modulated Ultra Wideband Radar Signals Based on Stepped Phase Shifting},
    venue = {Syracuse, USA},
    }
  • 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, Cape Town, South Africa, 2012. [Bibtex]
    @inproceedings{gardill2012a,
    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.},
    author = {Gardill, Markus and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059825},
    year = {2012},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Wideband Unidirectional Antenna Array Element With Stable Radiation Pattern},
    venue = {Cape Town, South Africa},
    }
  • 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, Hangzhou, China, 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},
    booktitle = {Joint Symposium on Opto- and Microelectronic Devices and Circuits},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059781},
    year = {2012},
    month = {09},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Microwave wideband spectroscopy techniques targeting biomedical sensing applications},
    venue = {Hangzhou, China},
    }
  • [DOI] A. Esswein, C. Carlowitz, G. Fischer, M. Vossiek, R. Weigel, and T. Ußmüller, "An Integrated Switched Injection-Locked Oscillator for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems" in Proceedings - IEEE International Conference on Ultra-Wideband, Syracuse, USA, 2012, pp. 270-273. [Bibtex]
    @inproceedings{esswein2012,
    abstract = {This paper describes an integrated switched injection-locked oscillator (SILO) circuit for use in pulsed angular modulated ultra wideband communication and radar systems. The circuit consists of two active baluns for single-ended to differential and differential to single-ended conversion, a Schmitt-trigger with modified current mirror load for current peak generation and a simple cross-coupled oscillator for signal generation. It has an externally controllable pulse repetition rate and a pulse duration of approx. 1ns. During operation it consumes 33mA at 3.3V supply voltage, while generating a 370 mVpp signal. The generated signal has a 10dB-bandwidth of over 2GHz at 7.5 GHz center frequency. Measurement results with an external baseband generator are shown. © 2012 IEEE.},
    author = {Esswein, Alexander and Carlowitz, Christian and Fischer, Georg and Vossiek, Martin and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {Proceedings - IEEE International Conference on Ultra-Wideband},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025324},
    year = {2012},
    month = {09},
    day = {17},
    doi = {10.1109/ICUWB.2012.6340458},
    eventdate = {2012-09-17/2012-09-20},
    eventtitle = {2012 IEEE International Conference on Ultra-Wideband, ICUWB 2012},
    faupublication = {yes},
    issn = {2162-6588},
    keywords = {Injection-Locking; Integrated Circuit; Pulse Generation; Pulsed Frequency Modulated Radar; Radar; VCO},
    pages = {270--273},
    title = {An Integrated Switched Injection-Locked Oscillator for Pulsed Angle Modulated Ultra Wideband Communication and Radar Systems},
    venue = {Syracuse, USA},
    }
  • [DOI] G. Vinci, F. Barbon, S. Lindner, R. Weigel, and A. Koelpin, "Six-Port Based High-Resolution Smart Antenna Alignment Sensor" in IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, Cape Town, South Africa, 2012, pp. 280-283. [Bibtex]
    @inproceedings{vinci2012e,
    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.},
    author = {Vinci, Gabor and Barbon, Francesco and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059792},
    year = {2012},
    month = {09},
    day = {02},
    doi = {10.1109/APWC.2012.6324912},
    eventdate = {2012-09-02/2012-09-07},
    faupublication = {yes},
    isbn = {9781467304047},
    keywords = {Antenna measurements; Microwave communication; Receiving antennas; Wireless sensor networks; Six-Port; Enhanced Six-Port; Smart Antenna},
    number = {13058997},
    pages = {280--283},
    peerreviewed = {Yes},
    title = {Six-Port Based High-Resolution Smart Antenna Alignment Sensor},
    venue = {Cape Town, South Africa},
    }
  • 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, Miltenberg, 2012. [Bibtex]
    @inproceedings{talai2012,
    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.},
    author = {Talai, Armin and Koelpin, Alexander and Weigel, Robert},
    publisher = {URSI},
    booktitle = {U.R.S.I. Kleinheubacher Tagung 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059905},
    year = {2012},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Erforschung geeigneter Modellierungstechniken für 3D Hochfrequenzstruktursimulationen zur Bestimmung der effektiven relativen Permittivität für porosizierte LTCC Substrate},
    venue = {Miltenberg},
    }
  • [DOI] A. Schwarzmeier, L. M. 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, Jena, Germany, 2012. [Bibtex]
    @inproceedings{schwarzmeier2012,
    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.},
    author = {Schwarzmeier, Andre and Reuter, Lukas Michael and Mena-Carrillo, Juan and Weber, Werner and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {46th annual conference of the German Society for Biomedical Engineering},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059904},
    year = {2012},
    month = {09},
    doi = {10.1515/BMT-2012-4103},
    faupublication = {yes},
    keywords = {Medical; Platform; Energy; Budget},
    peerreviewed = {unknown},
    title = {A Low-Power Embedded Communication Platform for Medical Applications},
    venue = {Jena, Germany},
    }
  • J. Bialek, F. Ohnhäuser, A. Wickmann, G. Fischer, and R. Weigel, "Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer" in Kleinheubacher Tagung, Kleinheubach, DE, 2012. [Bibtex]
    @inproceedings{bialek2012,
    author = {Bialek, Jan and Ohnhäuser, Frank and Wickmann, Andreas and Fischer, Georg and Weigel, Robert},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059730},
    year = {2012},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer},
    venue = {Kleinheubach, DE},
    }
  • [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 2012 IEEE MTT-S International Microwave Symposium Digest (MTT), Montreal, Canada, 2012. [Bibtex]
    @inproceedings{hofmann2012c,
    abstract = {This paper presents a novel parameterized Debye 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.},
    author = {Hofmann, Maximilian and Trenz, Florian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    language = {English},
    publisher = {IEEE},
    booktitle = {2012 IEEE MTT-S International Microwave Symposium Digest (MTT)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1061048},
    year = {2012},
    month = {08},
    day = {17},
    doi = {HTTP://DX.DOI.ORG/10.1109/MWSYM.2012.6259771},
    eventdate = {2012-06-17/2012-06-22},
    eventtitle = {IEEE International Microwave Symposium},
    faupublication = {yes},
    isbn = {9781467310864},
    issn = {0149-645X},
    keywords = {Diabetes;Electromagnetic reflection;Relaxation methods},
    peerreviewed = {Yes},
    title = {A Microwave Sensing System for Aqueous Concentration Measurements based on a Microwave Reflectometer},
    type = {Konferenzschrift},
    venue = {Montreal, Canada},
    }
  • 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, Montreal, Canada, 2012, pp. 1-3. [Bibtex]
    @inproceedings{laemmle2012a,
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE MTT-S International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059806},
    year = {2012},
    month = {06},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {unknown},
    title = {An integrated 125 GHz sensor with read-out circuit for permittivity measurement of liquids},
    venue = {Montreal, Canada},
    }
  • [DOI] B. Waldmann, R. Ebelt, M. Vossiek, and R. Weigel, "An Ultra-Wideband Local Positioning System for Highly Complex Indoor Environments" in 2012 International Conference on Localization and GNSS, ICL-GNSS 2012, Starnberg, Germany, 2012. [Bibtex]
    @inproceedings{waldmann2012,
    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. © 2012 IEEE.},
    author = {Waldmann, Benjamin and Ebelt, Randolf and Vossiek, Martin and Weigel, Robert},
    booktitle = {2012 International Conference on Localization and GNSS, ICL-GNSS 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1025328},
    year = {2012},
    month = {06},
    day = {25},
    doi = {10.1109/ICL-GNSS.2012.6253125},
    eventdate = {2012-06-25/2012-06-27},
    eventtitle = {International Conference on Localization and GNSS},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {An Ultra-Wideband Local Positioning System for Highly Complex Indoor Environments},
    venue = {Starnberg, Germany},
    }
  • [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, Montreal, Canada, 2012. [Bibtex]
    @inproceedings{nasr2012a,
    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.},
    author = {Nasr, Ismail and Dudek, Manuel and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Radio Frequency Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059782},
    year = {2012},
    month = {06},
    doi = {10.1109/RFIC.2012.6242286},
    faupublication = {yes},
    keywords = {Quadrature oscillator (QVCO); Colpitts; Wide tuning range; superharmonic coupling},
    peerreviewed = {unknown},
    title = {A 33% Tuning Range High Output Power V-Band Superharmonic Coupled Quadrature VCO in SiGe Technology},
    venue = {Montreal, Canada},
    }
  • 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, Mannheim, 2012. [Bibtex]
    @inproceedings{vinci2012c,
    author = {Vinci, Gabor and Barbon, Francesco and Lämmle, Benjamin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {CST European User Group Meeting (CST EUGM) 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059894},
    year = {2012},
    month = {06},
    faupublication = {yes},
    keywords = {Six-Port},
    peerreviewed = {unknown},
    title = {Six-Port Based Direction Finding and Micrometer-Accuracy Displacement Detection},
    venue = {Mannheim},
    }
  • [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, Montreal, Canada, 2012, pp. 1-3. [Bibtex]
    @inproceedings{vinci2012d,
    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.},
    author = {Vinci, Gabor and Barbon, Francesco and Lämmle, Benjamin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {International Microwave Symposium (IMS) 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059892},
    year = {2012},
    month = {06},
    doi = {10.1109/MWSYM.2012.6259622},
    faupublication = {yes},
    isbn = {9781467310857},
    keywords = {Calibration; Detectors; Microwave Circuits; Receiving Antennas; Silicon Germanium; Six-Port},
    pages = {1--3},
    peerreviewed = {unknown},
    title = {A Wide-Range 77 GHz Direction of Arrival Detector with Integrated Dual Six-Port Receiver},
    venue = {Montreal, Canada},
    }
  • [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, Montreal, QC, CA, 2012, pp. 1-3. [Bibtex]
    @inproceedings{gonser2012,
    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.},
    author = {Gonser, Markus and Keller, Christian and Hansen, Jan and Khilkevich, Victor and Radachenko, Andriy and Weigel, Robert and Pommerenke, David},
    booktitle = {IEEE MTT-S International Symposium Digest (IMS), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059794},
    year = {2012},
    month = {06},
    doi = {10.1109/MWSYM.2012.6259432},
    faupublication = {yes},
    keywords = {Antenna measurements; Electromagnetic compatibility; Integrated circuit modeling; Numerical models; Power cables; Stochastic processes},
    pages = {1--3},
    peerreviewed = {unknown},
    title = {Simulation of Automotive EMC Emission Test Procedures Based on Cable Bundle Measurements},
    venue = {Montreal, QC, CA},
    }
  • [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, Montreal, QC, CA, 2012, pp. 1-3. [Bibtex]
    @inproceedings{zorn2012,
    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.},
    author = {Zorn, Stefan and Gardill, Markus and Rose, Richard and Götz, Alexander and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE MTT-S International Microwave Symposium Digest (MTT), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059822},
    year = {2012},
    month = {06},
    doi = {10.1109/MWSYM.2012.6257769},
    faupublication = {yes},
    keywords = {GSM; Jamming; Mobile communication; Mobile handsets; Multiaccess communication; Radio frequency; Spread spectrum communication; FPGA},
    pages = {1--3},
    peerreviewed = {unknown},
    title = {A Smart Jamming System for UMTS/WCDMA Cellular Phone Networks for Search and Rescue Applications},
    venue = {Montreal, QC, CA},
    }
  • [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 International Microwave Symposium, Montreal, Canada, 2012. [Bibtex]
    @inproceedings{barbon2012a,
    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.},
    author = {Barbon, Francesco and Vinci, Gabor and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059742},
    year = {2012},
    month = {06},
    day = {17},
    doi = {10.1109/MWSYM.2012.6259624},
    eventdate = {2012-06-17/2012-06-22},
    faupublication = {yes},
    isbn = {9781467310864},
    keywords = {six-port; vibrometer; positioning; calibration; phase measurement; interferometer; radar},
    peerreviewed = {Yes},
    title = {A Six-Port Interferometer Based Micrometer-Accuracy Displacement and Vibration Measurement Radar},
    venue = {Montreal, Canada},
    }
  • [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), Warsaw, 2012, pp. 402-405. [Bibtex]
    @inproceedings{soell2012,
    author = {Söll, Christopher and Walk, Jasmin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {19th International Conference on Microwave, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059725},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233487},
    faupublication = {yes},
    pages = {402--405},
    peerreviewed = {unknown},
    title = {Implantable Antenna for Medical Sensor Platforms},
    venue = {Warsaw},
    }
  • 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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059789},
    year = {2012},
    month = {05},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    pages = {107--117},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Reflection, Refraction, and Self-Jamming},
    }
  • 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), Ulm, Germany, 2012. [Bibtex]
    @inproceedings{rascher2012a,
    author = {Rascher, Jochen and Zohny, Amr and Weigel, Robert},
    publisher = {GEROTRON COMMUNICATION GmbH},
    booktitle = {Electric and Electronic Engineering for Communication Workshop (EEEfCOM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059728},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Techniques for Reconfigurable Integrated Power Amplifiers with RF Switches},
    venue = {Ulm, Germany},
    }
  • [DOI] L. M. 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), Budapest, HU, 2012, pp. 1-4. [Bibtex]
    @inproceedings{reuter2012a,
    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.},
    author = {Reuter, Lukas Michael and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE International Symposium on Medical Measurements and Apllications Proceedings (MeMeA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059903},
    year = {2012},
    month = {05},
    doi = {10.1109/MEMEA.2012.6226652},
    faupublication = {yes},
    keywords = {Ambient Assisted Living (AAL); medical devices; power measurement; wireless health assistance; energy harvesting; energy consumption characterization},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 16-Channel Synchronous Sampling Power Measurement System For Wireless Health Assistance Devices},
    venue = {Budapest, HU},
    }
  • 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, Ulm, Germany, 2012. [Bibtex]
    @inproceedings{maser2012a,
    author = {Maser, Matthias and Gardill, Markus and Gulden, Peter and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {GEROTRON COMMUNICATION GmbH},
    booktitle = {Electrical and Electronic Engineering for Communication, EEEfCOM 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059817},
    year = {2012},
    month = {05},
    faupublication = {yes},
    keywords = {Local Positioning},
    peerreviewed = {unknown},
    title = {Local Positioning mit einem integrierten Breitband-FMCW System},
    venue = {Ulm, Germany},
    }
  • [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, Warsaw, Poland, 2012, pp. 641-646. [Bibtex]
    @inproceedings{schroeter2012,
    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.},
    author = {Schröter, Simon and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    booktitle = {19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059787},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233563},
    faupublication = {yes},
    pages = {641--646},
    peerreviewed = {unknown},
    title = {A practical beamsteering algorithm with low phase fluctuation for WCDMA/HSUPA uplink using transmit power control bits as feedback},
    venue = {Warsaw, Poland},
    volume = {2},
    }
  • [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, Warsaw, PL, 2012, pp. 85-88. [Bibtex]
    @inproceedings{wiehl2012a,
    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.},
    author = {Wiehl, Michael and Schwarzer, Stefan and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    booktitle = {19th International Conference on Microwave Radar and Wireless Communications (MIKON), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059757},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233474},
    faupublication = {yes},
    keywords = {UHF antennas; biomedical MRI; biomedical communication; biomedical telemetry; microwave antennas; radio links; transient response; wireless channels},
    pages = {85--88},
    peerreviewed = {unknown},
    title = {Channgel Impulse response Inside a Magnetic Resonance Imaging Device at 0.8 GHz to 27 GHz},
    venue = {Warsaw, PL},
    volume = {1},
    }
  • [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,
    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.},
    author = {Wojnowski, Maciej and Sommer, Grit and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059756},
    year = {2012},
    month = {05},
    doi = {10.1109/TMTT.2012.2195018},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {Calibration; microwave measurements; scattering parameters},
    number = {7},
    pages = {2203--2219},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Device Characterization Techniques Based on Causal Relationships},
    volume = {60},
    }
  • [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,
    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.},
    author = {Koelpin, Alexander and Vinci, Gabor and Lämmle, Benjamin and Lindner, Stefan and Barbon, Francesco and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059812},
    year = {2012},
    month = {05},
    doi = {10.1109/MMM.2012.2185390},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {six-port; AoA},
    number = {3},
    pages = {118--127},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Six-Port Technology for Traffic Safety},
    volume = {13},
    }
  • [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), Poland, Warsaw, 2012, pp. 483-486. [Bibtex]
    @inproceedings{hartmann2012a,
    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.},
    author = {Hartmann, Christian and Rascher, Jochen and Weigel, Robert and Fischer, Georg and Ußmüller, Thomas},
    booktitle = {19th International Conference on Microwaves, Radar and Wireless Communications (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059755},
    year = {2012},
    month = {05},
    doi = {10.1109/MIKON.2012.6233580},
    faupublication = {yes},
    pages = {483--486},
    peerreviewed = {unknown},
    title = {A CMOS RF Front-End IC for Multi Antenna Diversity Applications in the S-Band},
    venue = {Poland, Warsaw},
    }
  • [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, Graz, AT, 2012, pp. 254-258. [Bibtex]
    @inproceedings{kissinger2012b,
    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.},
    author = {Kissinger, Dietmar and Agethen, Roman and Weigel, Robert},
    booktitle = {IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059719},
    year = {2012},
    month = {05},
    doi = {10.1109/I2MTC.2012.6229244},
    faupublication = {yes},
    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},
    pages = {254--258},
    peerreviewed = {unknown},
    title = {A Versatile Built-In Test Architecture for Integrated Millimeter-Wave Radar Receiver Front-Ends},
    venue = {Graz, AT},
    }
  • [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, Baltimore, 2012, pp. 1-4. [Bibtex]
    @inproceedings{hagelauer2012,
    author = {Hagelauer, Amelie and Ußmüller, Thomas and Weigel, Robert},
    booktitle = {IEEE International Frequency Control Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059710},
    year = {2012},
    month = {05},
    doi = {10.1109/FCS.2012.6243630},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {SAW and CMOS RFID Transponder-based Wireless Systems and their Applications},
    venue = {Baltimore},
    }
  • 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, Ulm, 2012. [Bibtex]
    @inproceedings{zohny2012,
    author = {Zohny, Amr and Rascher, Jochen and Weigel, Robert},
    booktitle = {Electrical and Electronic Engineering for Communication EEEfCOM 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059800},
    year = {2012},
    month = {05},
    faupublication = {yes},
    keywords = {Linearity; Power Amplifier; CMOS; ACPR; Intermodulation},
    peerreviewed = {unknown},
    title = {Simulation and Implementation Demands for State-of-the-Art Integrated Linear Power Amplifiers},
    venue = {Ulm},
    }
  • T. Lautenbacher, C. Schmidt, M. Fehr, M. Kamper, R. Weigel, G. Fischer, and A. Koelpin, "Klasse-E Leistungsverstärker mit Lastmodulation" in EEEfCOM 2012, Ulm Germany, 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},
    booktitle = {EEEfCOM 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059907},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Klasse-E Leistungsverstärker mit Lastmodulation},
    venue = {Ulm Germany},
    }
  • [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, Orlando, FL, 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},
    booktitle = {6th Annual IEEE International Conference on RFID},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059737},
    year = {2012},
    month = {04},
    doi = {10.1109/RFID.2012.6193058},
    faupublication = {yes},
    isbn = {9781467303293},
    pages = {66--73},
    peerreviewed = {unknown},
    title = {A Multistandard HF/ UHF-RFID-Tag With Integrated Sensor Interface and Localization Capability},
    venue = {Orlando, FL},
    }
  • F. Langmann, 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, Karlsruhe, 2012. [Bibtex]
    @inproceedings{hausknecht2012,
    author = {Langmann, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Fischer, Georg and Weigel, Robert},
    booktitle = {7th Karlsruhe Workshop on Software Radios},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059715},
    year = {2012},
    month = {03},
    faupublication = {yes},
    keywords = {Digital; Platform; Multichannel; Scanning; Receiver; Architecture},
    peerreviewed = {unknown},
    title = {A Digital Platform for a Multichannel Digital Wideband Scanning Receiver},
    venue = {Karlsruhe},
    }
  • [DOI] F. Langmann, 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, Chemnitz, 2012. [Bibtex]
    @inproceedings{hausknecht2012a,
    author = {Langmann, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Trautwein, Uwe and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Conference on Communication and Signal Processing 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059739},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6197940},
    faupublication = {yes},
    keywords = {Scanning; Surveillance; Receiver; Firmware; Digital; Multichannel},
    peerreviewed = {unknown},
    title = {Efficient Firmware Implementation of a Multichannel Scanning Receiver for Surveillance Applications},
    venue = {Chemnitz},
    }
  • [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,
    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.},
    author = {Hasch, Jürgen and Topak, E. and Schnabel, Raik and Zwick, Thomas and Weigel, Robert and Waldschmidt, Christian},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059826},
    year = {2012},
    month = {03},
    doi = {10.1109/TMTT.2011.2178427},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {antennas; millimetre wave radar; packaging; road vehicle radar; advanced packaging concepts; antenna systems; Automotive radar; Sensors},
    number = {3},
    pages = {845--860},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {Millimeter-Wave Technology for Automotive Radar Sensors in the 77 GHz Frequency Band},
    volume = {60},
    }
  • [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), Chemnitz, AT, 2012, pp. 1-7. [Bibtex]
    @inproceedings{zimmermann2012a,
    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.},
    author = {Zimmermann, Lars and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    booktitle = {9th International Multi-Conference on Systems, Signals and Devices (SSD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059783},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6197970},
    faupublication = {yes},
    keywords = {cellular radio; direction-of-arrival estimation; mobile handsets; parameter estimation; radiowave propagation; signal classification; AOA; GSM mobile phone localization},
    pages = {1--7},
    peerreviewed = {unknown},
    title = {GSM Mobile Phone Localization using Time Difference of Arrival and Angle of Arrival Estimation},
    venue = {Chemnitz, AT},
    }
  • 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, Ilmenau, Germany, 2012, pp. 1-4. [Bibtex]
    @inproceedings{vinci2012b,
    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.},
    author = {Vinci, Gabor and Barbon, Francesco and Lämmle, Benjamin and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {German Microwave Conference (GeMiC) 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059893},
    year = {2012},
    month = {03},
    faupublication = {yes},
    isbn = {9781457720963},
    keywords = {Calibration; Detectors; Dynamic range; Phase measurement; Radio frequency; Receivers; Schottky diodes; Six-Port},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Wide-Range, Dual Six-Port based Direction-Of-Arrival Detector},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6185176},
    venue = {Ilmenau, Germany},
    }
  • C. Carlowitz, A. Esswein, R. Weigel, and M. Vossiek, "A low power Pulse Frequency Modulated UWB radar transmitter concept based on switched injection locked harmonic sampling" in 7th German Microwave Conference (GeMiC2012), Ilmenau, Germany, 2012. [Bibtex]
    @inproceedings{carlowitz2012,
    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.},
    author = {Carlowitz, Christian and Esswein, Alexander and Weigel, Robert and Vossiek, Martin},
    language = {English},
    booktitle = {7th German Microwave Conference (GeMiC2012)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1055485},
    year = {2012},
    month = {03},
    faupublication = {yes},
    isbn = {9781457720963},
    issn = {2167-8022},
    peerreviewed = {Yes},
    title = {A low power Pulse Frequency Modulated UWB radar transmitter concept based on switched injection locked harmonic sampling},
    venue = {Ilmenau, Germany},
    }
  • L. M. 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, Nuremberg, Germany, 2012, pp. 1-4. [Bibtex]
    @inproceedings{reuter2012,
    author = {Reuter, Lukas Michael and Agethen, Roman and Lurz, Fabian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {Embedded World Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059896},
    year = {2012},
    month = {03},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {No},
    title = {A mobile microcontroller platform for sensor fusion and communication},
    venue = {Nuremberg, Germany},
    }
  • R. Mzyk, G. Dehm-Andone, F. Langmann, G. Fischer, R. Weigel, and A. Koelpin, "Design Aspects of Scanning Receiver Systems" in IEEE German Microwave Conference, Ilmenau, Germany, 2012. [Bibtex]
    @inproceedings{mzyk2012,
    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.},
    author = {Mzyk, Raphael and Dehm-Andone, Gunther and Langmann, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059734},
    year = {2012},
    month = {03},
    faupublication = {yes},
    keywords = {Scanning receiver; frequency synthesis; reconfigurable filter; multi channel receiver},
    peerreviewed = {unknown},
    title = {Design Aspects of Scanning Receiver Systems},
    venue = {Ilmenau, Germany},
    }
  • [DOI] R. Mzyk, G. Dehm-Andone, F. Langmann, 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, Warsaw, Poland, 2012, pp. 45-49. [Bibtex]
    @inproceedings{mzyk2012a,
    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.},
    author = {Mzyk, Raphael and Dehm-Andone, Gunther and Langmann, Frank and Fischer, Georg and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE International Conference on Microwaves, Radar & Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059818},
    year = {2012},
    month = {03},
    doi = {10.1109/MIKON.2012.6233481},
    faupublication = {yes},
    keywords = {Scanning receiver; surveillance; clock distribution; frequency synthesis; reconfigurable filter},
    pages = {45--49},
    peerreviewed = {unknown},
    title = {Analysis of Key Modules in an Analog Front-End for Scanning Receiver Systems},
    venue = {Warsaw, Poland},
    }
  • [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 9th International Multi-Conference on Systems, Signals and Devices, Chemnitz, 2012, pp. 1-5. [Bibtex]
    @inproceedings{koelpin2012a,
    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.},
    author = {Koelpin, Alexander and Vinci, Gabor and Barbon, Francesco and Lindner, Stefan and Fischer, Georg and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {9th International Multi-Conference on Systems, Signals and Devices},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059811},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6198100},
    faupublication = {yes},
    isbn = {9781467315906},
    keywords = {Antenna measurements; Microwave circuits; Microwave integrated circuits; Microwave measurements; Receivers; direction-of-arrival estimation; Six-Port},
    number = {12726797},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {The Six-Port Technology: A Low-Cost Concept for Precise Position Measurements},
    venue = {Chemnitz},
    }
  • [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,
    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.},
    author = {Wojnowski, Maciej and Issakov, Vadim and Knoblinger, G. and Pressel, Klaus and Sommer, Grit and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059816},
    year = {2012},
    month = {03},
    doi = {10.1109/TCPMT.2012.2186963},
    faupublication = {yes},
    issn = {2156-3950},
    journaltitle = {IEEE Transactions on Components, Packaging and Manufacturing Technology},
    keywords = {Microwave measurements; packaging; passive circuits; phase noise; thin-film inductors; wafer-scale integration; voltage-controlled oscillators},
    number = {8},
    pages = {1280--1292},
    peerreviewed = {Yes},
    title = {High-Q Inductors Embedded in the Fan-Out Area of an eWLB},
    volume = {2},
    }
  • 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, Ilmenau, DE, 2012, pp. 1-4. [Bibtex]
    @inproceedings{hofmann2012e,
    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.},
    author = {Hofmann, Maximilian and Edelmann, Jan-Christoph and Bolz, Armin and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {The 7th German Microwave Conference (GeMiC), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059747},
    year = {2012},
    month = {03},
    faupublication = {yes},
    keywords = {HF antennas; biomechanics; biomedical measurement; cardiovascular system; compressibility; electromagnetic fields; feedback; antennas},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Modeling and Experimental Investigation of Microwave Cardiopulmonary Resuscitation Feedback Systems},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6185166},
    venue = {Ilmenau, DE},
    }
  • 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, Duesseldorf, DE, 2012, pp. 183-190. [Bibtex]
    @inproceedings{frick2012,
    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.},
    author = {Frick, Marco and Eidher, R. and Weigel, Robert},
    booktitle = {Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059813},
    year = {2012},
    month = {02},
    faupublication = {yes},
    pages = {183--190},
    peerreviewed = {unknown},
    title = {Einfluss der Ic-Pin-Impedanz auf die Ergebnisse der leitungsgefuehrten Stoerfestigkeit integrierter Schaltungen},
    venue = {Duesseldorf, DE},
    }
  • R. Weigel, Hochfrequenzsystemtechnik, Vieweg, 2012.. [Bibtex]
    @book{weigel2012b,
    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.},
    author = {Weigel, Robert},
    publisher = {Vieweg},
    booktitle = {Informationstechnik kompakt},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059722},
    year = {2012},
    month = {02},
    faupublication = {yes},
    isbn = {9783528038717},
    keywords = {Hochfrequenztechnik; Signale und Systeme; Filter; Informationstheorie und Quellencodierung; Kanalcodierung; Basisbandübertragung; Modulation; Transformationen},
    peerreviewed = {No},
    title = {Hochfrequenzsystemtechnik},
    type = {Band aus einer Reihe},
    }
  • R. Weigel and L. Reindl, Wireless Communication and Sensing Techniques Based on Surface Acoustic Wave Devices, URSI, 2012.. [Bibtex]
    @book{weigel2012a,
    author = {Weigel, Robert and Reindl, Leonhard},
    publisher = {URSI},
    booktitle = {Review of Radio Science: 1999-2002 URSI},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059724},
    year = {2012},
    month = {02},
    faupublication = {yes},
    isbn = {9780471268666},
    peerreviewed = {No},
    title = {Wireless Communication and Sensing Techniques Based on Surface Acoustic Wave Devices},
    type = {Band aus einer Reihe},
    }
  • [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 9th International Multi-Conference on Systems, Signals and Devices (SSD), Chemnitz, 2012, pp. 1-5. [Bibtex]
    @inproceedings{barbon2012,
    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.},
    author = {Barbon, Francesco and Vinci, Gabor and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {9th International Multi-Conference on Systems, Signals and Devices (SSD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059891},
    year = {2012},
    month = {02},
    day = {20},
    doi = {10.1109/SSD.2012.6197973},
    eventdate = {2012-03-20/2012-03-23},
    faupublication = {yes},
    keywords = {Direction-of-Arrival; Six-Port; Angle Measurement},
    pages = {1--5},
    peerreviewed = {Yes},
    title = {Signal Processing Strategies for Six-Port Based Direction of Arrival Detector Systems},
    venue = {Chemnitz},
    }
  • [DOI] R. Neumayer and R. Weigel, Challenges in Automotive Electromagnetics Compatibility Modeling and Simulation, Springer, 2012, vol. 96.. [Bibtex]
    @book{neumayer2012,
    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.},
    author = {Neumayer, Roland and Weigel, Robert},
    publisher = {Springer},
    booktitle = {Electromagnetics in a Complex World},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059824},
    year = {2012},
    month = {02},
    doi = {10.1007/978-3-642-18596-0_8},
    faupublication = {yes},
    peerreviewed = {Yes},
    series = {Springer Proceedings in Physics},
    title = {Challenges in Automotive Electromagnetics Compatibility Modeling and Simulation},
    type = {Band aus einer Reihe},
    volume = {96},
    }
  • [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, Santa Clara, CA, USA, 2012, pp. 247-250. [Bibtex]
    @inproceedings{vinci2012a,
    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.},
    author = {Vinci, Gabor and Lämmle, Benjamin and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {Radio-Wireless Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059895},
    year = {2012},
    month = {01},
    day = {15},
    doi = {10.1109/RWS.2012.6175346},
    eventdate = {2012-01-15/2012-01-18},
    faupublication = {yes},
    isbn = {9781457711534},
    keywords = {Antenna measurements; Antennas; Automotive engineering; Detectors; Microstrip; Radar; Receivers},
    number = {12639686},
    pages = {247--250},
    peerreviewed = {Yes},
    title = {A 77 GHz Direction of Arrival Detector System with SiGe Integrated Six-Port Receiver},
    venue = {Santa Clara, CA, USA},
    }
  • J. Walk, T. Ußmüller, R. Weigel, and G. Fischer, "Telemedicine at the example of sensor implants" in IEEE Radio and Wireless Symposium (RWS), Santa Clara, CA, USA, 2012. [Bibtex]
    @inproceedings{walk2012,
    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.},
    author = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {IEEE Radio and Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059711},
    year = {2012},
    month = {01},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Telemedicine at the example of sensor implants},
    venue = {Santa Clara, CA, USA},
    }
  • [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,
    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.},
    author = {Lourandakis, Errikos and Weigel, Robert and Mextorf, Henning and Knöchel, Reinhard},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059808},
    year = {2012},
    month = {01},
    doi = {10.1109/MMM.2011.2173987},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    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},
    number = {1},
    pages = {111--121},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Circuit Agility},
    volume = {13},
    }
  • [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), Santa Clara, CA, 2012, pp. 85-88. [Bibtex]
    @inproceedings{abou-chahine2012,
    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.},
    author = {Abou-Chahine, Zeid and Felgentreff, Tilman and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059714},
    year = {2012},
    month = {01},
    doi = {10.1109/PAWR.2012.6174930},
    faupublication = {yes},
    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},
    pages = {85--88},
    peerreviewed = {unknown},
    title = {Efficiency Analysis of the Asymmetric 2-Level Outphasing PA with Rayleigh Enveloped Signals},
    venue = {Santa Clara, CA},
    }
  • 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, Santa Clara, CA, 2012, pp. 45-48. [Bibtex]
    @inproceedings{laemmle2012,
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar and Weigel, Robert},
    booktitle = {IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059796},
    year = {2012},
    month = {01},
    faupublication = {yes},
    pages = {45--48},
    peerreviewed = {unknown},
    title = {A 62 GHz reflectometer for biomedical sensor readout in SiGe BiCMOS technology},
    venue = {Santa Clara, CA},
    }
  • [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, Las Vegas, NV, 2012, pp. 270-274. [Bibtex]
    @inproceedings{kuba2012,
    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).},
    author = {Kuba, Matthias and Klatt, M. and Ronge, Karlheinz and Weigel, Robert},
    booktitle = {IEEE Consumer Communications and Networking Conference (CCNC), 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059754},
    year = {2012},
    month = {01},
    doi = {10.1109/CCNC.2012.6181100},
    faupublication = {yes},
    keywords = {embedded systems; feature extraction; home networks; internetworking; network servers; open systems; protocols; radio networks},
    pages = {270--274},
    peerreviewed = {unknown},
    title = {Automatic Communication Standard Recognition in Wireless Smart Home Networks},
    venue = {Las Vegas, NV},
    }
  • [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, Santa Clara, USA, 2012, pp. 29-32. [Bibtex]
    @inproceedings{koelpin2012,
    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.},
    author = {Koelpin, Alexander and Lindner, Stefan and Vinci, Gabor and Lämmle, Benjamin and Weigel, Robert},
    booktitle = {IEEE Topical Meeting on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059802},
    year = {2012},
    month = {01},
    doi = {10.1109/WISNET.2012.6172143},
    faupublication = {yes},
    keywords = {enhanced six-port; microwave circuit},
    pages = {29--32},
    peerreviewed = {Yes},
    title = {The Enhanced Six-Port Architecture: A Measurement Based Proof of Concept},
    venue = {Santa Clara, USA},
    }
  • [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, Santa Clara, CA, USA, 2012, pp. 49-52. [Bibtex]
    @inproceedings{nasr2012,
    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.},
    author = {Nasr, Ismail and Lämmle, Benjamin and Knapp, Herbert and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE Topical Meeting Silicon Monolithic Integrated Circuits in RF Systems Digest},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059823},
    year = {2012},
    month = {01},
    doi = {10.1109/SIRF.2012.6160130},
    faupublication = {yes},
    isbn = {9781457713170},
    keywords = {VCO; Transformer; Frequency Dividers; Colpitts; FMCW},
    pages = {49--52},
    peerreviewed = {unknown},
    title = {A wide tuning range high output power 56-74 GHz VCO with on-chip transformer load in SiGe technology},
    venue = {Santa Clara, CA, USA},
    }
  • [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), Santa Clara, USA, 2012, pp. 21-24. [Bibtex]
    @inproceedings{rascher2012,
    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.},
    author = {Rascher, Jochen and Pinarello, Sandro and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    booktitle = {2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059788},
    year = {2012},
    month = {01},
    doi = {10.1109/SIRF.2012.6160157},
    faupublication = {yes},
    isbn = {9781457713170},
    pages = {21--24},
    peerreviewed = {unknown},
    title = {Highly linear robust RF switch with low insertion loss and high power handling capability in a 65nm CMOS technology},
    venue = {Santa Clara, USA},
    }
  • [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), Santa Clara (CA), USA, 2012, pp. 107-110. [Bibtex]
    @inproceedings{dudek2012,
    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.},
    author = {Dudek, Manuel and Nasr, Ismail and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {IEEE Radio Wireless Symposium (RWS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059908},
    year = {2012},
    month = {01},
    doi = {10.1109/RWS.2012.6175357},
    faupublication = {yes},
    pages = {107--110},
    peerreviewed = {unknown},
    title = {The Impact of Antenna Characteristics on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications},
    venue = {Santa Clara (CA), USA},
    }
  • [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},
    booktitle = {IEEE Topical Conference of Antennas and Propagation in Wireless Communications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059901},
    year = {2012},
    doi = {10.1109/APWC.2012.6324940},
    faupublication = {yes},
    pages = {856--860},
    peerreviewed = {unknown},
    title = {Robust Time and Frequency Synchronization for OFDM Systems with Maximum Spectrum Flexibility},
    }
  • [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, Syracuse, NewYork, USA, 2012. [Bibtex]
    @inproceedings{hamouda2012,
    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.},
    author = {Hamouda, Mohamed and Sachs, Jürgen and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {Internation Conference on Ultra-wide Band 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059803},
    year = {2012},
    doi = {10.1109/ICUWB.2012.6340420},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {High Precision Wireless Synchronization Receiver for M-Sequence UWB Radio Systems},
    venue = {Syracuse, NewYork, USA},
    }
  • M. Hofmann, M. Bloss, R. Weigel, G. Fischer, and D. Kissinger, "Non-Invasive Glucose Monitoring Using Open Electromagnetic Waveguides" in EuMA European Microwave Conference, Amsterdam, 2012. [Bibtex]
    @inproceedings{hofmann2012b,
    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.},
    author = {Hofmann, Maximilian and Bloss, M. and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {EuMA European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059750},
    year = {2012},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Non-Invasive Glucose Monitoring Using Open Electromagnetic Waveguides},
    venue = {Amsterdam},
    }
  • [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), Santa Clara, California, USA, 2012, pp. 25-28. [Bibtex]
    @inproceedings{goetz2012,
    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.},
    author = {Götz, Alexander and Rose, Richard and Zorn, Stefan and Fischer, Georg and Weigel, Robert},
    booktitle = {Topical Conference on Wireless Sensors and Sensor Networks (RWW / WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059777},
    year = {2012},
    doi = {10.1109/WISNET.2012.6172142},
    faupublication = {yes},
    keywords = {GSM; TDOA; Localization; Frequency Hopping},
    pages = {25--28},
    peerreviewed = {unknown},
    title = {Performance of Coherent Time Delay Estimation Techniques for Frequency Hopping GSM Signals},
    venue = {Santa Clara, California, USA},
    }
  • M. Hamouda, G. Fischer, R. Weigel, and T. Ußmüller, "A Low Power SiGe HBT LNA For UWB Applications" in German Microwave Conference, Ilmenau, Germany, 2012. [Bibtex]
    @inproceedings{hamouda2012a,
    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.},
    author = {Hamouda, Mohamed and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059741},
    year = {2012},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Low Power SiGe HBT LNA For UWB Applications},
    venue = {Ilmenau, Germany},
    }
  • [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, Warschau, Polen, 2012. [Bibtex]
    @inproceedings{lautenbacher2012,
    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.},
    author = {Lautenbacher, Thomas and Mzyk, Raphael and Weigel, Robert and Fischer, Georg and Koelpin, Alexander},
    booktitle = {Microwave and Radar Week MRW 2012 Warschau},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059740},
    year = {2012},
    doi = {10.1109/MIKON.2012.6233484},
    faupublication = {yes},
    keywords = {Split Ring Resonator; High-Q; Suspended Stripline; tuning; RF MEMS; varactor; balun; reconstruction filter},
    peerreviewed = {unknown},
    title = {High-Q Split Ring Resonators for Tuning and Balun Applications},
    venue = {Warschau, Polen},
    }
  • [DOI] S. 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), Poland, 2012. [Bibtex]
    @inproceedings{pourmousavi2012,
    author = {Pour Mousavi, Seyed Mehran and Wojnowski, Maciej and Pressel, Klaus and Sommer, Grit and Weigel, Robert},
    booktitle = {International Microwave Radar and Wireless Communications Symposium (MIKON)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059797},
    year = {2012},
    doi = {10.1109/MIKON.2012.6233595},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Passive components using quasi-CPW in eWLB package},
    venue = {Poland},
    }
  • R. Rosales, T. Klie, S. Glock, Y. Xu, B. Wang, R. Hasholzner, J. Teich, and R. Weigel, "Eine Aktor-Orientierte Methodik zur Power-Modellierung auf Systemebene", Design & Elektronik, pp. 1-9, 2012. [Bibtex]
    @article{rosales2012,
    author = {Rosales, Rafael and Klie, Torsten and Glock, Stefan and Xu, Yang and Wang, Bo and Hasholzner, Ralph and Teich, Jürgen and Weigel, Robert},
    publisher = {WEKA-Fachmedien},
    cris = {https://cris.fau.de/converis/publicweb/publication/1048510},
    year = {2012},
    faupublication = {yes},
    issn = {0933-8667},
    journaltitle = {Design & Elektronik},
    pages = {1--9},
    peerreviewed = {unknown},
    title = {Eine Aktor-Orientierte Methodik zur Power-Modellierung auf Systemebene},
    }
  • 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, Amsterdam, The Netherlands, 2012. [Bibtex]
    @inproceedings{nehring2012,
    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.},
    author = {Nehring, Johannes and Hofmann, Maximilian and Münker, Christian and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    publisher = {IEEE},
    booktitle = {IEEE European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059779},
    year = {2012},
    faupublication = {yes},
    keywords = {wideband directional coupler; wideband; coupler; non-uniform},
    peerreviewed = {unknown},
    title = {A Universal Method for the Design and Synthesis of Wideband Directional Couplers using Non-Uniform Coupled Transmission Lines},
    venue = {Amsterdam, The Netherlands},
    }
  • [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, Grenoble, France, 2012. [Bibtex]
    @inproceedings{maser2012,
    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%.},
    author = {Maser, Matthias and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {2012 International Semiconductor Conference Dresden - Grenoble},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059751},
    year = {2012},
    doi = {10.1109/ISCDG.2012.6359998},
    faupublication = {yes},
    keywords = {FMCW-radar; negative inductance; SiGe Bipolar; tuning linearization; ultra-wide continuous tuning range; voltage controlled oscillator},
    peerreviewed = {unknown},
    title = {An Integrated SiGe Bipolar VCO with Linearized Tuning Behavior and Ultra-Wide Tuning Range for UWB FMCW Local Positioning Systems},
    venue = {Grenoble, France},
    }
  • [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, Krakau, PL, 2012, pp. 1350-1353. [Bibtex]
    @inproceedings{weigel2012,
    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.},
    author = {Weigel, Robert and Hartmann, Alexander and Strzoda, Rainer and Schrobenhauser, Robert},
    booktitle = {European Conference on Solid-State Transducers, EUROSENSOR 2012},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059708},
    year = {2012},
    doi = {10.1016/J.PROENG.2012.09.406},
    faupublication = {yes},
    keywords = {Gas concentration; interference; fringe; rejection; elimination},
    pages = {1350--1353},
    peerreviewed = {unknown},
    title = {Arithmetical elimination of superimposed interference modulation in laser spectroscopic gas concentration measurements},
    venue = {Krakau, PL},
    volume = {47},
    }
  • C. Spratler, P. Hugelmann, and R. Weigel, "Fluessigmetallschleifkontakte in der EMV" in Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit, Duesseldorf, DE, 2012. [Bibtex]
    @inproceedings{spratler2012,
    author = {Spratler, Christian and Hugelmann, P. and Weigel, Robert},
    booktitle = {Internationale Fachmess und Kongress fuer Elektromagnetische Vertraeglichkeit},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059799},
    year = {2012},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Fluessigmetallschleifkontakte in der EMV},
    venue = {Duesseldorf, DE},
    }

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), Melbourne, Australia, 2011, pp. 1897-1900. [Bibtex]
    @inproceedings{rascher2011a,
    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.},
    author = {Rascher, Jochen and Pinarello, Sandro and Müller, Jan-Erik and Fischer, Georg and Weigel, Robert},
    booktitle = {Asia-Pacific Microwave Conference 2011 (APMC 2011)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059264},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1897--1900},
    peerreviewed = {unknown},
    title = {Methods for Low Insertion Loss RF Switches with Increased Power Handling Capability in 65nm CMOS},
    venue = {Melbourne, Australia},
    }
  • [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), Singapore, SG, 2011, pp. 423-429. [Bibtex]
    @inproceedings{wojnowski2011,
    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).},
    author = {Wojnowski, Maciej and Lachner, Rudolf and Böck, Josef and Wagner, Christoph and Starzer, Florian and Sommer, Grit and Pressel, Klaus and Weigel, Robert},
    booktitle = {IEEE 13th Electronics Packaging Technology Conference (EPTC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059321},
    year = {2011},
    month = {12},
    doi = {10.1109/EPTC.2011.6184458},
    faupublication = {yes},
    isbn = {9781457719813},
    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},
    pages = {423--429},
    peerreviewed = {unknown},
    title = {Embedded Wafer Level Ball Grid Array (eWLB) Technology for Millimeter-Wave Applications},
    venue = {Singapore, SG},
    }
  • 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, Melbourne, Australia, 2011, pp. 1-4. [Bibtex]
    @inproceedings{glock2011a,
    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.},
    author = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059238},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A Power-Aware Behavioral Model of a Five-State Phase-Frequency Detector},
    venue = {Melbourne, Australia},
    }
  • 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), Melbourne, Australia, 2011, pp. 1478-1481. [Bibtex]
    @inproceedings{dudek2011f,
    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.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {Asia-Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059246},
    year = {2011},
    month = {12},
    faupublication = {yes},
    pages = {1478--1481},
    peerreviewed = {unknown},
    title = {A Versatile System Simulation Environment for Millimeter-Wave Phased-Array FMCW-Radar Sensors for Automotive Applications},
    venue = {Melbourne, Australia},
    }
  • [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,
    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.},
    author = {Su, Tao and Unger, Markus and Steinecke, Thomas and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059317},
    year = {2011},
    month = {12},
    doi = {10.1109/TEMC.2011.2178098},
    faupublication = {yes},
    issn = {0018-9375},
    journaltitle = {IEEE Transactions on Electromagnetic Compatibility},
    keywords = {Electromagnetic compatibility; electromagnetic interference (EMI); integrated circuits (ICs); microcontrollers; oscillators},
    number = {4},
    pages = {772--784},
    peerreviewed = {Yes},
    shortjournal = {IEEE T ELECTROMAGN C},
    title = {Degradation of the Conducted Radio Frequency Immunity of Microcontrollers Due to Electromagnetic Resonances in Foot-Point Loops},
    volume = {54},
    }
  • 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, Melbourne, VIC, 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},
    booktitle = {Asia-Pacific Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059310},
    year = {2011},
    month = {12},
    faupublication = {yes},
    isbn = {9781457720345},
    pages = {1238--1241},
    peerreviewed = {unknown},
    title = {Design of a 12 ghz low-power extended true single phase clock (e-tspc) prescaler in 0.13 um cmos technology},
    venue = {Melbourne, VIC},
    }
  • A. Esswein, G. Dehm-Andone, A. Aleksieieva, C. Carlowitz, G. Fischer, M. Vossiek, R. Weigel, and T. Ussmueller, "Spannungsgesteuerter Colpitts-Oszillator mit weitem Abstimmbereich in Silizium-Germanium-Technologie und Ausgangsschalter zur Generierung gepulster frequenzmodulierter Ultrabreitband-Signale" in 12. GMM/ITG-Fachtagung Analog 2011, 2011. [Bibtex]
    @inproceedings{esswein2011,
    author = {Esswein, Alexander and Dehm-Andone, Gunther and Aleksieieva, Anna and Carlowitz, Christian and Fischer, Georg and Vossiek, Martin and Weigel, Robert and Ussmueller, Thomas},
    booktitle = {12. GMM/ITG-Fachtagung Analog 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1054431},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Spannungsgesteuerter Colpitts-Oszillator mit weitem Abstimmbereich in Silizium-Germanium-Technologie und Ausgangsschalter zur Generierung gepulster frequenzmodulierter Ultrabreitband-Signale},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, R. Weigel, and D. Kissinger, "Integrated dielectric millimeter-wave sensors for biomedical applications (invited)" in Analog, Erlangen, germany, 2011, pp. 177-181. [Bibtex]
    @inproceedings{laemmle2011c,
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {Analog},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059314},
    year = {2011},
    month = {11},
    faupublication = {yes},
    pages = {177--181},
    peerreviewed = {unknown},
    title = {Integrated dielectric millimeter-wave sensors for biomedical applications (invited)},
    venue = {Erlangen, germany},
    }
  • M. Jung, K. Schmid, G. Fischer, R. Weigel, and T. Ußmüller, "Vergleich verschiedener schaltungskonzepte für stromgebende ladungspumpen in phasenregelschleifen" in 12. GMM/ITGFachtagung Analog, Erlangen, 2011. [Bibtex]
    @inproceedings{jung2011c,
    author = {Jung, Melanie and Schmid, Konstantin and Fischer, Georg and Weigel, Robert and Ußmüller, Thomas},
    booktitle = {12. GMM/ITGFachtagung Analog},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059308},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Vergleich verschiedener schaltungskonzepte für stromgebende ladungspumpen in phasenregelschleifen},
    venue = {Erlangen},
    }
  • [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, Melbourne, Australia, 2011, pp. 4515-4520. [Bibtex]
    @inproceedings{gabiger-rose2011b,
    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.},
    author = {Gabiger-Rose, Anna and Kube, Matthias and Schmitt, Peter and Weigel, Robert and Rose, Richard},
    publisher = {IEEE},
    booktitle = {IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059315},
    year = {2011},
    month = {11},
    doi = {10.1109/IECON.2011.6120053},
    faupublication = {yes},
    pages = {4515--4520},
    peerreviewed = {unknown},
    title = {Image denoising using bilateral filter with noise-adaptive parameter tuning},
    venue = {Melbourne, Australia},
    }
  • 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, Erlangen, Germany, 2011, pp. 104-109. [Bibtex]
    @inproceedings{dudek2011e,
    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.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {12. GMM/ITG-Fachtagung ANALOG},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059245},
    year = {2011},
    month = {11},
    faupublication = {yes},
    isbn = {9783800733699},
    pages = {104--109},
    peerreviewed = {unknown},
    title = {An Advanced Millimeter-Wave FMCW-Radar System Simulation Environment for the Automotive Sector},
    venue = {Erlangen, Germany},
    }
  • 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, Erlangen, DE, 2011. [Bibtex]
    @inproceedings{dudek2011d,
    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.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059244},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Eine erweiterte Millimeterwellen FMCW-Radar Systemsimulationsumgebung fuer den Einsatz im Automobilbereich},
    venue = {Erlangen, DE},
    }
  • 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, Erlangen, DE, 2011. [Bibtex]
    @inproceedings{zeller2011b,
    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.},
    author = {Zeller, Sebastian and Münker, Christian and Weigel, Robert},
    booktitle = {ANALOG'11 Fachtagung Entwicklung von Analogschaltungen mit CAE-Methoden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059297},
    year = {2011},
    month = {11},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ein zeitkontinuierlicher Sigma-Delta-Wandler neunter Ordnung mit neuartigen kreuzgekoppelten Resonatoren},
    venue = {Erlangen, DE},
    }
  • [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, Palmerston North, New Zealand, 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},
    language = {English},
    booktitle = {Internation Conference on Sensing Technology},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059282},
    year = {2011},
    month = {11},
    day = {28},
    doi = {10.1109/ICSENST.2011.6137024},
    eventdate = {2011-11-28/2011-12-01},
    faupublication = {yes},
    pages = {496--499},
    peerreviewed = {Yes},
    title = {An online telemetering system for mobile health parameter monitoring and medical assistance},
    venue = {Palmerston North, New Zealand},
    }
  • [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},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059274},
    year = {2011},
    month = {11},
    doi = {10.1109/JSEN.2011.2156782},
    faupublication = {yes},
    issn = {1530-437X},
    journaltitle = {IEEE Sensors Journal},
    number = {11},
    pages = {2698--2710},
    peerreviewed = {Yes},
    shortjournal = {IEEE SENS J},
    title = {Energy-efficient wireless sensing using a generic ADC sensor interface within a passive multi-standard RFID transponder},
    volume = {11},
    }
  • [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},
    booktitle = {SDR-WinnComm Europe Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059302},
    year = {2011},
    month = {11},
    doi = {10.1007/S11265-011-0640-8},
    faupublication = {yes},
    pages = {11--21},
    peerreviewed = {unknown},
    title = {SDR OFDM Waveform Design for a UGV/UAV Communication Scenario},
    }
  • 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, Manchester, UK, 2011, pp. 265-268. [Bibtex]
    @inproceedings{vinci2011b,
    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.},
    author = {Vinci, Gabor and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {European Microwave Week (EuMW) 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059296},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781457711565},
    keywords = {Accuracy; Calibration; Detectors; Polynomials; Radio frequency; Receiving antennas},
    pages = {265--268},
    peerreviewed = {unknown},
    title = {A Novel, Wide Angle, High Resolution Direction-Of-Arrival Detector},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6101014},
    venue = {Manchester, UK},
    }
  • [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, Limerick, IE, 2011, pp. 1301-1304. [Bibtex]
    @inproceedings{zorn2011a,
    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.},
    author = {Zorn, Stefan and Bozsik, Gabor and Rose, Richard and Götz, Alexander and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Sensors},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059277},
    year = {2011},
    month = {10},
    doi = {10.1109/ICSENS.2011.6127162},
    faupublication = {yes},
    keywords = {cellular radio; disasters; earthquakes; geomorphology; mobile handsets; sensor placement; statistical analysis; GSM},
    pages = {1301--1304},
    peerreviewed = {unknown},
    title = {A power sensor unit for the localization of GSM mobile phones for search and rescue applications},
    venue = {Limerick, IE},
    }
  • R. Rose, S. Zorn, A. Götz, G. Fischer, and R. Weigel, "A new technique to improve AoA using dual polarization" in European Microwave Conference, Manchester, UK, 2011, pp. 420-423. [Bibtex]
    @inproceedings{rose2011a,
    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.},
    author = {Rose, Richard and Zorn, Stefan and Götz, Alexander and Fischer, Georg and Weigel, Robert},
    booktitle = {European Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059318},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781612842356},
    pages = {420--423},
    peerreviewed = {unknown},
    title = {A new technique to improve AoA using dual polarization},
    venue = {Manchester, UK},
    }
  • [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, Orlando, FL, USA, 2011, pp. 1829-1832. [Bibtex]
    @inproceedings{koch2011,
    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.},
    author = {Koch, Robert and Bauer, Christian and Kiwitt, Jürgen and Potschi, F.M. and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE International Ultrasonics Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059293},
    year = {2011},
    month = {10},
    doi = {10.1109/ULTSYM.2011.0457},
    faupublication = {yes},
    keywords = {3G mobile communication; Q-factor; bulk acoustic wave devices; code division multiple access; surface acoustic wave filters; BAW technology},
    pages = {1829--1832},
    peerreviewed = {unknown},
    title = {Ultra low-profile self-matched HTCC SAW-duplexer: manufacturing and performance challenges},
    venue = {Orlando, FL, USA},
    }
  • [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, Atlanta, GA, USA, 2011, pp. 219-222. [Bibtex]
    @inproceedings{laemmle2011b,
    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.},
    author = {Lämmle, Benjamin and Vinci, Gabor and Maurer, Linus and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Bipolar/BiCMOS Circuits and Technology Meeting (BCTM) 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059313},
    year = {2011},
    month = {10},
    doi = {10.1109/BCTM.2011.6082786},
    faupublication = {yes},
    isbn = {9781612841656},
    keywords = {Antenna measurements; Calibration; Detectors; Frequency measurement; Phase measurement; Radar; Six-Port},
    number = {12385847},
    pages = {219--222},
    peerreviewed = {unknown},
    title = {An Integrated 77-GHz Six-Port Receiver Frontend for Angle-of-Arrival Detection},
    venue = {Atlanta, GA, USA},
    }
  • 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, Waikoloa, HI, 2011, pp. 1-4. [Bibtex]
    @inproceedings{laemmle2011a,
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar and Weigel, Robert},
    booktitle = {IEEE Compound Semiconductor Integrated Circuits Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059312},
    year = {2011},
    month = {10},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 122 GHz multiprobe reflectometer for dielectric sensor readout in SiGe BiCMOS technology},
    venue = {Waikoloa, HI},
    }
  • 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), Manchester, UK, 2011, pp. 131-134. [Bibtex]
    @inproceedings{walk2011c,
    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.},
    author = {Walk, Jasmin and Ußmüller, Thomas and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {European Microwave Conference (EuMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059278},
    year = {2011},
    month = {10},
    faupublication = {yes},
    pages = {131--134},
    peerreviewed = {unknown},
    title = {Remote Powering Systems of Medical Implants for Maintenance Free Healthcare Applications},
    venue = {Manchester, UK},
    }
  • 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, Manchester, EN, 2011, pp. 272-275. [Bibtex]
    @inproceedings{kamper2011,
    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.},
    author = {Kamper, Michael and Ulbricht, Gerald and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {European Microwave Integrated Circuits Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059285},
    year = {2011},
    month = {10},
    faupublication = {yes},
    keywords = {UHF power amplifiers; current-mode circuits; intermodulation distortion; radiofrequency amplifiers; current mode class D power amplifier; reverse intermodulation distortion},
    pages = {272--275},
    peerreviewed = {unknown},
    title = {Comparison of class A and class D RF amplifier operation with focus on reverse intermodulation and efficiency performance},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6102785},
    venue = {Manchester, EN},
    }
  • 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), Manchester, UK, 2011, pp. 89-92. [Bibtex]
    @inproceedings{dudek2011c,
    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.},
    author = {Dudek, Manuel and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {European Radar Conference (EuRAD)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059243},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781457711565},
    pages = {89--92},
    peerreviewed = {unknown},
    title = {A millimeter-wave FMCW radar system simulator for automotive applications including nonlinear component models},
    venue = {Manchester, UK},
    }
  • 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, Barcelona, Spain, 2011, pp. 1-3. [Bibtex]
    @inproceedings{dehm-andone2011,
    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},
    author = {Dehm-Andone, Gunther and Wansch, Rainer and Gerhäuser, Heinz and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Metamaterials 2011: The Fifth International Congress on Advanced Elec-tromagnetic Materials in Microwaves and Optics},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059260},
    year = {2011},
    month = {10},
    faupublication = {yes},
    keywords = {electromagnetic bandgap; cross polarization; surface wave suppression; reflector},
    pages = {1--3},
    peerreviewed = {unknown},
    title = {A cross polarized antenna with reflector based on electromagnetic bandgap (EBG) material},
    venue = {Barcelona, Spain},
    }
  • [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, Chengdu, China, 2011, pp. 494-497. [Bibtex]
    @inproceedings{dudek2011b,
    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.},
    author = {Dudek, Manuel and Nasr, Ismail and Kissinger, Dietmar and Weigel, Robert and Fischer, Georg},
    booktitle = {CIE International Conference on Radar},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059242},
    year = {2011},
    month = {10},
    doi = {10.1109/CIE-RADAR.2011.6159587},
    faupublication = {yes},
    pages = {494--497},
    peerreviewed = {unknown},
    title = {The Impact of Phase Noise Parameters on Target Signal Detection in FMCW-Radar System Simulations for Automotive Applications},
    venue = {Chengdu, China},
    }
  • [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,
    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.},
    author = {Gierlich, Roland and Hüttner, Jörg and Ziroff, Andreas and Weigel, Robert and Huemer, Mario},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059273},
    year = {2011},
    month = {10},
    doi = {10.1109/TMTT.2011.2169079},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    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},
    number = {12},
    pages = {3228--3238},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A Reconfigurable MIMO System for High-Precision FMCW Local Positioning},
    volume = {59},
    }
  • 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, Berlin, DE, 2011. [Bibtex]
    @inproceedings{weigel2011g,
    author = {Weigel, Robert and Koelpin, Alexander and Rose, Richard and Zorn, Stefan and Götz, Alexander},
    booktitle = {Future Security},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059254},
    year = {2011},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A new System for Mobile Phone Localization for Search and Rescue Applications},
    venue = {Berlin, DE},
    }
  • [DOI] R. Weigel, Á. 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, Torino, IT, 2011, pp. 568-571. [Bibtex]
    @inproceedings{weigel2011f,
    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.},
    author = {Weigel, Robert and Leibinger, Árpád and Giese, M.},
    publisher = {IEEE},
    booktitle = {International Conference on Electromagnetics in Advanced Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059256},
    year = {2011},
    month = {09},
    doi = {10.1109/ICEAA.2011.6046404},
    faupublication = {yes},
    keywords = {DC motors; electromagnetic compatibility; CISPR 25; SABER; automated EMC analysis; circuit simulation model; device optimization; electromagnetic compatibility},
    pages = {568--571},
    peerreviewed = {unknown},
    title = {Automated extraction of conducted emission relevant parameters in the case of a DC motor},
    venue = {Torino, IT},
    }
  • 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, Berlin, 2011. [Bibtex]
    @inproceedings{hausknecht2011,
    author = {Hausknecht, Frank and Mzyk, Raphael and Dehm-Andone, Gunther and Fischer, Georg and Weigel, Robert},
    booktitle = {6th Future Security Research conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059247},
    year = {2011},
    month = {09},
    faupublication = {yes},
    keywords = {Multichannel; scanning; Receiver; surveillance},
    peerreviewed = {unknown},
    title = {A multichannel scanning receiver system for surveillance applications},
    venue = {Berlin},
    }
  • [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, Dresden, Germany, 2011. [Bibtex]
    @inproceedings{agethen2011a,
    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.},
    author = {Agethen, Roman and Lämmle, Benjamin and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    booktitle = {IEEE Semiconductor Conference Dresden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059283},
    year = {2011},
    month = {09},
    doi = {10.1109/SCD.2011.6068746},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Design of an integrated 60 GHz cross-coupled oscillator in SiGe technology},
    venue = {Dresden, Germany},
    }
  • [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, Dresden, Germany, 2011, pp. 1-4. [Bibtex]
    @inproceedings{glock2011,
    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.},
    author = {Glock, Stefan and Fischer, Georg and Weigel, Robert and Hasholzner, Ralf and Ußmüller, Thomas},
    publisher = {IEEE},
    booktitle = {Semiconductor Conference Dresden 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059236},
    year = {2011},
    month = {09},
    doi = {10.1109/SCD.2011.6068723},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A state-based power estimation methodology at system level for integrated RF front-ends},
    venue = {Dresden, Germany},
    }
  • [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,
    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.},
    author = {Su, Tao and Unger, Markus and Steinecke, Thomas and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059255},
    year = {2011},
    month = {09},
    doi = {10.1109/TEMC.2011.2165341},
    faupublication = {yes},
    issn = {0018-9375},
    journaltitle = {IEEE Transactions on Electromagnetic Compatibility},
    keywords = {Electromagnetic compatibility (EMC); electromagnetic interference; failure analysis; integrated circuits (ICs); microcontrollers; simulation},
    number = {3},
    pages = {634--645},
    peerreviewed = {Yes},
    shortjournal = {IEEE T ELECTROMAGN C},
    title = {Using Error-Source Switching (ESS) Concept to Analyze the Conducted Radio Frequency Electromagnetic Immunity of Microcontrollers},
    volume = {54},
    }
  • [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, Dresden, 2011, pp. 1-4. [Bibtex]
    @inproceedings{jung2011b,
    author = {Jung, Melanie and Ferizi, Alban and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {Semiconductor Conference Dresden},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059309},
    year = {2011},
    month = {09},
    doi = {10.1109/SCD.2011.6068760},
    faupublication = {yes},
    isbn = {9781457704314},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A digital trimmable comparator for high precision ADCs in wireless sensor nodes},
    venue = {Dresden},
    }
  • [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, Long Beach, CA, USA, 2011, pp. 850-854. [Bibtex]
    @inproceedings{weigel2011e,
    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.},
    author = {Weigel, Robert and Frick, Marco and Eidher, R.},
    publisher = {IEEE},
    booktitle = {IEEE International Symposium on Electromagnetic Compatibility},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059257},
    year = {2011},
    month = {08},
    doi = {10.1109/ISEMC.2011.6038427},
    faupublication = {yes},
    keywords = {S-parameters; electromagnetic compatibility; integrated circuit testing; printed circuits; IC Pin; S-parameters; conducted immunity EMC test; injected real power},
    pages = {850--854},
    peerreviewed = {unknown},
    title = {A Method to Determine the Injected Real Power into an IC Pin in Case of a Conducted Immunity EMC Test},
    venue = {Long Beach, CA, USA},
    }
  • [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, Seoul, KR, 2011, pp. 1-4. [Bibtex]
    @inproceedings{zeller2011a,
    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.},
    author = {Zeller, Sebastian and Münker, Christian and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE International Midwest Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059299},
    year = {2011},
    month = {08},
    doi = {10.1109/MWSCAS.2011.6026508},
    faupublication = {yes},
    keywords = {continuous time systems; differential amplifiers; integrating circuits; operational amplifiers; poles and zeros; conjugate complex zeros},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 9th-Order Continuous Time Sigma-Delta-ADC with X-Coupled Differential Single-Opamp Resonators},
    venue = {Seoul, KR},
    }
  • [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, Seoul, 2011, pp. 1-4. [Bibtex]
    @inproceedings{jung2011a,
    author = {Jung, Melanie and Ferizi, Alban and Ußmüller, Thomas and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE International Midwest Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059311},
    year = {2011},
    month = {08},
    doi = {10.1109/MWSCAS.2011.6026272},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {A 9.7 mW 0.13 um CMOS PLL for Use in 24 GHz Sensor Nodes},
    venue = {Seoul},
    }
  • 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, Istanbul, Turkey, 2011, pp. 1-4. [Bibtex]
    @inproceedings{laemmle2011,
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Kissinger, Dietmar and Weigel, Robert},
    booktitle = {URSI General Assembly Scientific Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059300},
    year = {2011},
    month = {08},
    faupublication = {yes},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Fast and accurate design methodology for millimeter-wave integrated circuits (invited)},
    venue = {Istanbul, Turkey},
    }
  • [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, Trento, IT, 2011, pp. 233-236. [Bibtex]
    @inproceedings{zeller2011,
    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.},
    author = {Zeller, Sebastian and Münker, Christian and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Conference on Ph.D. Research in Microelectronics and Electronics},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059288},
    year = {2011},
    month = {07},
    doi = {10.1109/PRIME.2011.5966276},
    faupublication = {yes},
    keywords = {differential amplifiers; feedback amplifiers; low-power electronics; operational amplifiers; resonator filters; sigma-delta modulation},
    pages = {233--236},
    peerreviewed = {unknown},
    title = {A X-coupled differential single-opamp resonator for low power continuous time Sigma-Delta-ADCs},
    venue = {Trento, IT},
    }
  • 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, Potsdam, Germany, 2011, pp. 306-309. [Bibtex]
    @inproceedings{gabiger-rose2011a,
    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.},
    author = {Gabiger-Rose, Anna and Rose, Richard and Kube, Matthias and Schmitt, Peter and Weigel, Robert},
    publisher = {Society of High Performance Computational Imaging (SHPCI)},
    booktitle = {11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059316},
    year = {2011},
    month = {07},
    faupublication = {yes},
    pages = {306--309},
    peerreviewed = {unknown},
    title = {Noise-adaptive bilateral filtering of projections for Computed Tomography},
    url = {http://www.fully3d.org/2011/Fully3D2011Proceedings.pdf},
    venue = {Potsdam, Germany},
    }
  • 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), Baltimore, USA, 2011. [Bibtex]
    @inproceedings{ferizi2011,
    author = {Ferizi, Alban and Jung, Melanie and Weigel, Robert},
    booktitle = {IMS 2011 Workshop: Smart Wireless Sensor Networks (MTT-S)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059262},
    year = {2011},
    month = {06},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A 24 GHz Wireless Sensor Network with High Precision Local Positioning Capability},
    venue = {Baltimore, USA},
    }
  • 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, Nuremberg, Germany, 2011. [Bibtex]
    @inproceedings{weigel2011d,
    author = {Weigel, Robert and Vinci, Gabor and Lämmle, Benjamin and Koelpin, Alexander},
    booktitle = {Sensor & Test},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059250},
    year = {2011},
    month = {06},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A New Concept for Aligning Automotive Long-Range Radar Modules Based on Wireless Microwave Sensing},
    venue = {Nuremberg, Germany},
    }
  • 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, Baltimore,MD, USA, 2011. [Bibtex]
    @inproceedings{ussmueller2011b,
    author = {Ußmüller, Thomas and Heidrich, Jürgen and Brenk, Daniel and Essel, Jochen and Fischer, Georg and Weigel, Robert},
    booktitle = {IEEE MTT-S International Microwave Symposium, Workshop on Innovative and Highly Accurate Local Positioning Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059324},
    year = {2011},
    month = {06},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Distance Measurement with UHF RFID Transponders},
    venue = {Baltimore,MD, USA},
    }
  • [DOI] J. Stellet, C. Kutzera, and R. Weigel, "Optimale Geradenschätzung für Time-of-Flight Umfeldsensoren", Tm-Technisches Messen, vol. 78, iss. 6, pp. 286-291, 2011. [Bibtex]
    @article{stellet2011,
    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.},
    author = {Stellet, J. and Kutzera, Christian and Weigel, Robert},
    publisher = {De Gruyter},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059259},
    year = {2011},
    month = {06},
    doi = {10.1524/TEME.2011.0114},
    faupublication = {yes},
    issn = {0171-8096},
    journaltitle = {Tm-Technisches Messen},
    number = {6},
    pages = {286--291},
    peerreviewed = {Yes},
    shortjournal = {TECH MESS},
    title = {Optimale Geradenschätzung für Time-of-Flight Umfeldsensoren},
    volume = {78},
    }
  • [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, Baltimore, MD, USA, 2011. [Bibtex]
    @inproceedings{koelpin2011,
    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.},
    author = {Koelpin, Alexander and Vinci, Gabor and Lämmle, Benjamin and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {International Microwave Symposium 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059307},
    year = {2011},
    month = {06},
    doi = {10.1109/MWSYM.2011.5972688},
    faupublication = {yes},
    isbn = {9781612847542},
    keywords = {Ad hoc networks; Antennas; Equations; Microwave Circuits; Microwave Communication; Receivers; Direction of arrival; Six-Port},
    peerreviewed = {unknown},
    title = {The enhanced six-port receiver: A new concept for simultaneous data reception and direction of arrival detection},
    venue = {Baltimore, MD, USA},
    }
  • [DOI] R. Agethen, L. M. 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), Bari, Italy, 2011, pp. 111-114. [Bibtex]
    @inproceedings{agethen2011,
    author = {Agethen, Roman and Reuter, Lukas Michael and Lurz, Fabian and Fischer, Georg and Weigel, Robert and Kissinger, Dietmar},
    language = {English},
    booktitle = {IEEE International Workshop on Medical Measurements and Applications Proceedings(MeMeA)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059289},
    year = {2011},
    month = {05},
    day = {30},
    doi = {10.1109/MEMEA.2011.5966696},
    eventdate = {2011-05-30/2011-05-31},
    faupublication = {yes},
    pages = {111--114},
    peerreviewed = {Yes},
    title = {A compact medical platform for mobile sensor fusion and data communication},
    venue = {Bari, Italy},
    }
  • 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, Ulm, DE, 2011. [Bibtex]
    @inproceedings{weigel2011c,
    author = {Weigel, Robert and Fischer, Georg and Zorn, Stefan and Rose, Richard and Götz, Alexander},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059251},
    year = {2011},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ortung von GSM Mobiltelefonen zur Vermissten- und Verschuettetensuche},
    venue = {Ulm, DE},
    }
  • 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, Ulm, DE, 2011. [Bibtex]
    @inproceedings{weigel2011b,
    author = {Weigel, Robert and Dudek, Manuel},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059252},
    year = {2011},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Advanced Millimeter-Wave FMCW Radar System Simulations for Automotive Applications},
    venue = {Ulm, DE},
    }
  • [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, Bari, Italy, 2011, pp. 39-42. [Bibtex]
    @inproceedings{hofmann2011b,
    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.},
    author = {Hofmann, Maximilian and Fersch, Thomas and Weigel, Robert and Fischer, Georg and Kissinger, Dietmar},
    booktitle = {IEEE International Workshop on Medical Measurements and Applications},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059275},
    year = {2011},
    month = {05},
    doi = {10.1109/MEMEA.2011.5966704},
    faupublication = {yes},
    isbn = {9781424493364},
    pages = {39--42},
    peerreviewed = {unknown},
    title = {A novel approach to non-invasive blood glucose measurement based on RF transmission},
    venue = {Bari, Italy},
    }
  • M. Jung, A. Ferizi, and R. Weigel, "Lokalisierung in Sensornetzwerken und deren Basisbandverarbeitung", HF-Praxis, vol. 16, pp. 33-37, 2011. [Bibtex]
    @article{jung2011,
    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 Lokalis