Staff

Prof. Dr.-Ing. Alexander Kölpin

Contact

About Alexander Kölpin

Curriculum Vitae

05/2015

Privatdozent (Assistant Professor/University Lecturer), Institute for Electronics Engineering, University of Erlangen-Nuremberg

02/2011 –

11/2014

Habilitand for Electronics Engineering, University of Erlangen-Nuremberg, Habilitation Thesis: „Six-Port Based Microwave Interferometry for Professional Metrology Applications“

Since 07/2010

Group Leader Circuits, Systems & Hardware Test, Institute for Electronics Engineering, University of Erlangen-Nuremberg

07/2010

Doctoral Degree: „Der erweiterte Sechstor-Empfänger“ ("The Enhanced Six-Port Receiver"), Grade: 1,0 „with honors“

10/2007 – 07/2010

Team Leader Circuits, Systems & Hardware Test, Institute for Electronics Engineering, University of Erlangen-Nuremberg

Since 04/2005

Research Assistant/Akademischer Rat, Institute for Electronics Engineering, University of Erlangen-Nuremberg

Research Topics

  • Electronics Systems
  • Planar Circuitry from DC to 122 GHz
  • Electronics Systems for Smart Grid
  • Wireless Ultra-Low-Power Sensornodes and -Networks
  • Metrology, Material Characterization, and Modeling
  • Microwave Interferometry

Publications

A summary of my publications can be found at the end of this page or here.

Awards

  • A. Koelpin, F. Lurz, S. Linz, S. Mann, C. Will, and S. Lindner, Preis der ITG 2017, Informationstechnische Gesellschaft im VDE (ITG), 2017. [Bibtex]
    @prize{koelpin_prize_2017,
    abstract = {Preis der ITG 2017 für die Publikation „Six-Port Based Interferometry for Precise Radar and Sensing Applications“},
    author = {Koelpin, Alexander and Lurz, Fabian and Linz, Sarah and Mann, Sebastian and Will, Christoph and Lindner, Stefan},
    booktitle = {Informationstechnische Gesellschaft im VDE (ITG)},
    cris = {koelpin_prize_2017},
    year = {2017},
    month = {11},
    day = {27},
    title = {Preis der ITG 2017},
    }
  • 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},
    }
  • A. Koelpin, IEEE MTT-S Outstanding Young Engineer Award, IEEE Microwave Theory and Techniques Society, 2016. [Bibtex]
    @prize{koelpin_prize_2016,
    abstract = {For Outstanding Early Career Contributions to the Microwave Profession},
    author = {Koelpin, Alexander},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {koelpin_prize_2016},
    year = {2016},
    month = {05},
    day = {01},
    title = {IEEE MTT-S Outstanding Young Engineer Award},
    }
  • 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},
    }
  • 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},
    }
  • 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},
    }

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.

Patents

  • F. Lurz, S. Lindner, A. Koelpin, G. Sept-Enzel, P. Dingler, and E. Halder, Elektrisches Messsystem und Betriebsverfahren hierfür, 2016. [Bibtex]
    @patent{lurz_patent_2016,
    author = {Lurz, Fabian and Lindner, Stefan and Koelpin, Alexander and Sept-Enzel, Gerold and Dingler, Peter and Halder, Ernst},
    cris = {lurz_patent_2016},
    year = {2016},
    month = {10},
    day = {13},
    number = {DE102016119562.6},
    title = {Elektrisches Messsystem und Betriebsverfahren hierfür},
    type = {patent},
    }
  • M. Trautmann, B. Sanftl, A. Koelpin, T. Heckel, L. Frey, S. Ditze, A. Endruschat, C. Joffe, A. Rosskopf, and T. Schriefer, System zur drahtlosen Übertragung von Energie und Daten, 2016. [Bibtex]
    @patent{trautmann_patent_2016,
    abstract = {Die Erfindung betrifft ein System zur drahtlosen Übertragung von Energie und Daten, bei dem mindestens zwei in einem Abstand zueinander angeordnete Spulen oder elektrische Leiterbahnen für die Übertragung von Energie vorhanden sind. Dabei ist jeweils mindestens eine elektrische Spule oder elektrische Leiterbahn zur Übertragung von Energie und/oder mindestens eine elektrische Spule oder elektrische Leiterbahn zur Übertragung von Daten an jeweils eine elektrische Wechselspannungsquelle angeschlossen. Dabei ist mindestens eine elektrische Wechselspannungsquelle modulierbar. Die elektrischen Spulen oder elektrischen Leiterbahnen zur Übertragung von Daten sind mit elektrischer Spannung mit einer Frequenz, die kleiner als die Frequenz mit der eine elektrische Spannung zur Übertragung von Energie mittels der elektrischen Spulen oder elektrischen Leiterbahnen zur Übertragung von Energie eingesetzt ist, betrieben.},
    author = {Trautmann, Martin and Sanftl, Benedikt and Koelpin, Alexander and Heckel, Thomas and Frey, Lothar and Ditze, Stefan and Endruschat, Achim and Joffe, Christopher and Rosskopf, Andreas and Schriefer, Thomas},
    cris = {trautmann_patent_2016},
    year = {2016},
    month = {09},
    day = {29},
    keywords = {Inductive Power Transfer},
    number = {102016206767.2},
    title = {System zur drahtlosen Übertragung von Energie und Daten},
    type = {patent},
    }
  • S. Lindner, A. Koelpin, S. Linz, S. Mann, F. Barbon, E. Halder, and P. Dingler, Verfahren zur Messung der Frequenz eines Signals sowie elektrisches Messsystem, 2013. [Bibtex]
    @patent{lindner_patent_2013,
    author = {Lindner, Stefan and Koelpin, Alexander and Linz, Sarah and Mann, Sebastian and Barbon, Francesco and Halder, Ernst and Dingler, Peter},
    cris = {lindner_patent_2013},
    year = {2013},
    month = {05},
    number = {DE102013209364A1},
    title = {Verfahren zur Messung der Frequenz eines Signals sowie elektrisches Messsystem},
    type = {patent},
    url = {http://ip.com/pat/DE102013209364A1},
    }
  • F. Oesterle, F. Fink, H. Kuhn, and A. Koelpin, Verfahren zum Testen von Bauelementen und Messanordnung, 2013. [Bibtex]
    @patent{oesterle_patent_2013,
    author = {Oesterle, Florian and Fink, Franz and Kuhn, Harald and Koelpin, Alexander},
    cris = {oesterle_patent_2013},
    year = {2013},
    month = {05},
    day = {05},
    number = {DE102013102155B4},
    title = {Verfahren zum Testen von Bauelementen und Messanordnung},
    type = {patent},
    url = {http://ip.com/pat/DE102013102155B4},
    }
  • A. Koelpin, S. Mann, G. Vinci, S. Lindner, F. Barbon, E. Halder, and P. Dingler, Elektrisches Messsystem, 2013. [Bibtex]
    @patent{koelpin_patent_2013,
    author = {Koelpin, Alexander and Mann, Sebastian and Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Halder, Ernst and Dingler, Peter},
    cris = {koelpin_patent_2013},
    year = {2013},
    month = {02},
    number = {DE102013202765B4},
    title = {Elektrisches Messsystem},
    type = {patent},
    url = {http://ip.com/pat/DE102013202765B4},
    }
  • G. Vinci and A. Koelpin, Elektronische Abstandserfassungsvorrichtung, 2012. [Bibtex]
    @patent{vinci_patent_2012,
    author = {Vinci, Gabor and Koelpin, Alexander},
    cris = {vinci_patent_2012},
    year = {2012},
    month = {06},
    keywords = {Six-Port,High-Resolution Radar},
    number = {EP12174439A1},
    title = {Elektronische Abstandserfassungsvorrichtung},
    type = {patent},
    url = {http://ip.com/pat/EP2680032A1},
    }
  • A. Koelpin and G. Vinci, Verfahren und Vorrichtung zur Ermittlung einer Ausrichtung von Sensoren eines Fahrzeugs, 2009. [Bibtex]
    @patent{koelpin_patent_2009,
    abstract = {Die Erfindung betrifft ein Verfahren zur Ermittlung einer Ausrichtung von Sensoren (1) eines Fahrzeugs, bei welchem mittels des Sensors (1) ein hochfrequentes Sensorsignal (S) ausgesendet wird, welches von zumindest zwei Referenzpunkten (RP1, RP2) empfangen wird, wobei aus einer interferometrisch ermittelten Phasendifferenz (ΔΦ) zwischen den zumindest zwei von den Referenzpunkten (RP1, RP2) hochfrequenten empfangenen Signalen (S1, S2) die Ausrichtung des Sensors (1) bez glich einer Sensor-Referenzachse (R) ermittelt wird. Die Erfindung betrifft weiterhin eine Vorrichtung (2) zur Ermittlung einer Ausrichtung von Sensoren (1) eines Fahrzeugs mit zumindest zwei Empfangseinheiten (3.1 bis 3.n), die zum Empfang von zumindest zwei hochfrequenten Signalen (S1, S2) vorgesehen sind, wobei die Empfangseinheiten (E1 bis En) an zumindest zwei Referenzpunkten (RP1, RP2) angeordnet sind. Die Vorrichtung (2) umfasst weiterhin eine Auswerteeinheit (6), mittels welcher aus einer interferometrisch ermittelten Phasendifferenz (ΔΦ) zwischen den zumindest zwei hochfrequenten empfangenen Signalen (S1, S2) die Ausrichtung des Sensors (1) bez glich einer Sensor-Referenzachse (R) ermittelbar ist.},
    author = {Koelpin, Alexander and Vinci, Gabor},
    cris = {koelpin_patent_2009},
    year = {2009},
    month = {04},
    keywords = {six-port,radar calibration},
    number = {DE102009017369A1},
    title = {Verfahren und Vorrichtung zur Ermittlung einer Ausrichtung von Sensoren eines Fahrzeugs},
    type = {patent},
    url = {http://ip.com/pat/DE102009017369A1},
    }

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.

Publications

2018

  • M. Frank, P. Ghesquiere, S. Kiefl, R. Weigel, and A. Koelpin, "Design and Characterization of Antenna Arrays in eWLB Package for 61 GHz Radar Applications" in IEEE Radio & Wireless Week 2018, Anaheim, USA, 2018 (to be published). [Bibtex]
    @inproceedings{frank2018,
    abstract = {This paper presents the design of several two element antenna arrays in an eWLB package for 61 GHz radar applications. The antenna arrays are either formed of dipoles or folded dipoles. Different feeding structures were developed in order to match MMICs with differential or single-ended ports. Measurements of both insertion loss and radiation pattern were performed for five different antenna arrays. The measurement results are in good agreement with the previously performed simulations.},
    author = {Frank, Martin and Ghesquiere, Pol and Kiefl, Stefan and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {IEEE Radio & Wireless Week 2018},
    cris = {https://cris.fau.de/converis/publicweb/publication/1071565},
    year = {2018},
    month = {02},
    day = {14},
    eventdate = {2018-01-14/2018-01-17},
    faupublication = {yes},
    keywords = {Antenna in package,dipole antenna,eWLB package,antenna array},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {Design and Characterization of Antenna Arrays in eWLB Package for 61 GHz Radar Applications},
    type = {Konferenzschrift},
    venue = {Anaheim, USA},
    }

2017

  • M. Frank, A. Talai, R. Weigel, and A. Koelpin, "In-Line Material Characterization Sensors Operating at 10 GHz and 77 GHz" in Asia Pacific Microwave Conference (APMC) 2017, Kuala Lumpur, Malaysia, 2017 (to be published). [Bibtex]
    @inproceedings{frank2017b,
    abstract = {This paper describes the design of two sensors for the in-line material characterization of bulk and metallized dielectrics around 10 GHz and 77 GHz in order to determine the relative permittivity of RF substrates. The sensors are based on a resonant grounded coplanar waveguide structure and can be applied on top of a material under test. The shift in the resonance frequency between loaded and unloaded resonator is evaluated by 3D full wave simulations in order to determine the relative permittivity. The basic sensor structure is improved for the in-line characterization of printed circuit boards by a clearance of the resonator area and the filling of the air gaps. Measurements with different MUTs were performed with both sensors followed by the evaluation of the relative permittivity. The results are in good agreement with the expected permittivity values and show high reproducibility.},
    author = {Frank, Martin and Talai, Armin and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {Asia Pacific Microwave Conference (APMC) 2017},
    cris = {https://cris.fau.de/converis/publicweb/publication/1067176},
    year = {2017},
    month = {12},
    day = {14},
    eventdate = {2017-11-13/2017-11-16},
    faupublication = {yes},
    keywords = {Material Characterization; Relative Permittivity; Grounded Coplanar Waveguide},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {In-Line Material Characterization Sensors Operating at 10 GHz and 77 GHz},
    type = {Konferenzschrift},
    venue = {Kuala Lumpur, Malaysia},
    }
  • C. Will, S. Mann, F. Michler, T. Reißland, F. Lurz, R. Weigel, and A. Koelpin, "Error Compensation of the Temperature Influence on Radar based Displacement Measurements" in 2017 IEEE Asia Pacific Microwave Conference (APMC), Kuala Lumpur, 2017 (to be published). [Bibtex]
    @inproceedings{will2017c,
    abstract = {Highly precise sensor systems for contactless displacement measurements play an important role within the industrial application field. Various radar based measurement systems utilizing different techniques have been published for this purpose, but the influence of the ambient temperature on the measurement results has only rarely been investigated, yet. Whereas many publications deal with research on temperature compensation of single components, this paper describes the influence of the ambient temperature on the entire RF front end of the sensor system, a 61 GHz Six-Port interferometer. After presenting the measurement system, the temperature influences on the four output voltages and the consequences for the measurement results are analyzed. Finally, a compensation algorithm is proposed to decrease the temperature induced impairments of the systematic measurement error.},
    author = {Will, Christoph and Mann, Sebastian and Michler, Fabian and Reißland, Torsten and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {2017 IEEE Asia Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060632},
    year = {2017},
    month = {11},
    day = {13},
    eventdate = {2017-11-13/2017-11-16},
    eventtitle = {IEEE Asia Pacific Microwave Conference (APMC)},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {Yes},
    title = {Error Compensation of the Temperature Influence on Radar based Displacement Measurements},
    type = {Konferenzschrift},
    venue = {Kuala Lumpur},
    }
  • 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},
    }
  • 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},
    }
  • 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},
    }
  • 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, 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},
    }
  • C. Will, M. Sporer, N. Sebald, J. Fuchs, R. Weigel, and A. Koelpin, "Radarbasiertes Structural Health Monitoring der Rotorblätter von Windkaftanlagen" in Kleinheubacher Tagung, Miltenberg, 2017 (to be published). [Bibtex]
    @inproceedings{will2017b,
    author = {Will, Christoph and Sporer, Michael and Sebald, Nina and Fuchs, Jonas and Weigel, Robert and Koelpin, Alexander},
    publisher = {URSI},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/1072900},
    year = {2017},
    month = {09},
    day = {25},
    eventdate = {2017-09-25/2017-09-27},
    faupublication = {yes},
    note = {unpublished},
    peerreviewed = {automatic},
    title = {Radarbasiertes Structural Health Monitoring der Rotorblätter von Windkaftanlagen},
    venue = {Miltenberg},
    }
  • F. Pflaum and A. Koelpin, "Smart Home low power wireless sensor network with localization functionality" in Workshop on Localization in Wireless Sensor Networks, Honolulu, HI, USA, 2017. [Bibtex]
    @inproceedings{pflaum2017a,
    author = {Pflaum, Felix and Koelpin, Alexander},
    editor = {IEEE},
    language = {English},
    booktitle = {Workshop on Localization in Wireless Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1067054},
    year = {2017},
    month = {06},
    day = {09},
    eventdate = {2017-06-04/2017-06-09},
    eventtitle = {International Microwave Symposium 2017},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Smart Home low power wireless sensor network with localization functionality},
    type = {Konferenzschrift},
    venue = {Honolulu, HI, USA},
    }
  • 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] 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},
    }
  • [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},
    }
  • A. Koelpin and J. Thielecke, "BATS: A system approach for animal tracking in resources limited wireless sensor networks" in Workshop on Localization in Wireless Sensor Networks, Honolulu, HI, USA, 2017. [Bibtex]
    @inproceedings{koelpin2017,
    author = {Koelpin, Alexander and Thielecke, Jörn},
    editor = {IEEE},
    language = {English},
    booktitle = {Workshop on Localization in Wireless Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1064735},
    year = {2017},
    month = {06},
    day = {09},
    eventdate = {2017-06-04/2017-06-09},
    eventtitle = {International Microwave Symposium 2017},
    faupublication = {yes},
    keywords = {BATS; Sensorknoten,Ortung},
    peerreviewed = {Yes},
    title = {BATS: A system approach for animal tracking in resources limited wireless sensor networks},
    type = {Konferenzschrift},
    venue = {Honolulu, HI, 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},
    }
  • [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},
    }
  • S. Mueller and A. Koelpin, "Challenges on COTS-based Radiation Tolerant Communication System Design" in DLR Bauteilekonferenz, Jena, Germany, 2017. [Bibtex]
    @inproceedings{mueller2017,
    author = {Mueller, Steffen and Koelpin, Alexander},
    language = {German},
    booktitle = {DLR Bauteilekonferenz},
    cris = {https://cris.fau.de/converis/publicweb/publication/1063560},
    year = {2017},
    month = {04},
    day = {04},
    eventdate = {2017-04-04/2017-04-05},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Challenges on COTS-based Radiation Tolerant Communication System Design},
    type = {Konferenzschrift},
    venue = {Jena, Germany},
    }
  • [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] 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. 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},
    }
  • 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}, language = {English}, 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}, }

2016

  • [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] 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},
    }
  • 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] 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. 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] 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. 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, Germany, 2016. [Bibtex]
    @inproceedings{will2016a,
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    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, Germany},
    }
  • [DOI] A. Koelpin, F. Lurz, S. Linz, S. Mann, C. Will, and S. Lindner, "Six-Port Based Interferometry for Precise Radar and Sensing Application", Sensors, vol. 16, iss. 10, pp. 1-26, 2016. [Bibtex]
    @article{koelpin2016,
    author = {Koelpin, Alexander and Lurz, Fabian and Linz, Sarah and Mann, Sebastian and Will, Christoph and Lindner, Stefan},
    publisher = {MDPI},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060312},
    year = {2016},
    month = {09},
    doi = {10.3390/S16101556},
    faupublication = {yes},
    issn = {1424-8220},
    journaltitle = {Sensors},
    number = {10},
    pages = {1--26},
    peerreviewed = {Yes},
    shortjournal = {SENSORS-BASEL},
    title = {Six-Port Based Interferometry for Precise Radar and Sensing Application},
    volume = {16},
    }
  • [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},
    }
  • 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},
    }
  • 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},
    }
  • 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] E. Boshkovska, A. Koelpin, D. W. Kwan Ng, N. Zlatanov, and R. Schober, "Robust Beamforming for SWIPT Systems with Non-linear Energy Harvesting Model" in IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Edinburgh, UK, 2016, pp. 1-5. [Bibtex]
    @inproceedings{boshkovska2016,
    abstract = {This paper investigates resource allocation for simultaneous wireless information and power transfer (SWIPT) downlink systems based on a non-linear energy harvesting model. The resource allocation algorithm design is formulated as a non-convex optimization problem for the maximization of the total harvested power. The proposed problem formulation not only takes into account imperfect channel state information (CSI) but also guarantees the quality-of-service (QoS) of information transfer. A novel iterative algorithm is proposed to obtain the globally optimal solution of the considered non-convex optimization problem. In each iteration, a rank-constrained semidefinite program (SDP) is solved optimally by SDP relaxation. Simulation results demonstrate the significant gains in harvested power and the robustness against CSI imperfection for the proposed optimal resource allocation, compared to a baseline scheme designed for perfect CSI and the conventional linear energy harvesting model.},
    author = {Boshkovska, Elena and Koelpin, Alexander and Kwan Ng, Derrick Wing and Zlatanov, Nikola and Schober, Robert},
    booktitle = {IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060296},
    year = {2016},
    month = {07},
    day = {03},
    doi = {10.1109/SPAWC.2016.7536860},
    eventdate = {2016-07-03/2016-07-06},
    faupublication = {yes},
    keywords = {Energy Harvesting; Diode Detector},
    pages = {1--5},
    peerreviewed = {unknown},
    title = {Robust Beamforming for SWIPT Systems with Non-linear Energy Harvesting Model},
    venue = {Edinburgh, UK},
    }
  • [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] 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},
    }
  • [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] 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},
    }
  • 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] 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] 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] 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] 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] 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},
    }
  • 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},
    }
  • [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. Dressler, S. Ripperger, M. Hierold, T. Nowak, C. Eibel, B. Cassens, F. Mayer, K. Meyer-Wegener, and A. Koelpin, "From Radio Telemetry to Ultra-Low Power Sensor Networks - Tracking Bats in the Wild", IEEE Communications Magazine, vol. 54, iss. 1, pp. 129-135, 2016. [Bibtex]
    @article{dressler2016,
    abstract = {Sensor networks have successfully been used for wildlife monitoring and tracking of different species. When it comes to small animals such as smaller birds, mammals, or even insects, the current approach is to use extremely lightweight RF tags located using radio telemetry. A new quantum leap in technology is needed to overcome this limitation and enable new ways to observe larger numbers of small animals. In an interdisciplinary team, we are working on the different aspects of such a new technology. In particular, we report on our findings on a sensor-network-based tracking solution for bats. Our system is based on integrated localization and wireless communication protocols for ultra-low-power systems. This requires coding techniques for improved reliability as well as ranging solutions for tracking hunting bats. We address the technological and methodical problems related to system design, software support, and protocol design. First field experiments have been conducted that showcase the capabilities of our system.},
    author = {Dressler, Falko and Ripperger, Simon and Hierold, Martin and Nowak, Thorsten and Eibel, Christopher and Cassens, Björn and Mayer, Frieder and Meyer-Wegener, Klaus and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE Institute of Electrical and Electronics},
    cris = {https://cris.fau.de/converis/publicweb/publication/1035187},
    year = {2016},
    month = {01},
    doi = {10.1109/MCOM.2016.7378438},
    faupublication = {yes},
    issn = {0163-6804},
    journaltitle = {IEEE Communications Magazine},
    number = {1},
    pages = {129--135},
    peerreviewed = {Yes},
    shortjournal = {IEEE COMMUN MAG},
    title = {From Radio Telemetry to Ultra-Low Power Sensor Networks - Tracking Bats in the Wild},
    type = {Article in Journal},
    url = {http://www.ccs-labs.org/bib/dressler2016bats/dressler2016bats.pdf},
    volume = {54},
    }
  • [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] 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] 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] 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] 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] G. Vinci and A. Koelpin, "Progress of Six-Port technology for industrial radar applications" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Austin, TX, USA, 2016, pp. 48-51. [Bibtex]
    @inproceedings{vinci2016,
    abstract = {Six-Port receivers are well-known in the microwave test and measurement community since decades. The basic network topology has been implemented for simple reflectometer applications as well as complex network analysis. In the last decade however, a new application area for this receiver technology has been explored: Radar. Year after year new applications have been covered by radar systems taking benefit of the complex additive mixing technique of Six-Port receivers. Especially, innovative radar measurement solutions for industrial applications have been addressed by developing new hardware based on this receiver topology. In this paper, an overview of Six-Port technology will be given focusing on industrial applications that benefit from this receiver technique, the advantages as well as the drawbacks of this technology.},
    author = {Vinci, Gabor and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060291},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444319},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    keywords = {Six-Port; Radar},
    pages = {48--51},
    peerreviewed = {Yes},
    title = {Progress of Six-Port technology for industrial radar applications},
    venue = {Austin, TX, USA},
    }
  • 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},
    }

2015

  • [DOI] C. Will, K. Shi, F. Lurz, R. Weigel, and A. Koelpin, "Intelligent Signal Processing Routine for Instantaneous Heart Rate Detection using a Six-Port Microwave Interferometer" in IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 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 = {IEEE 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},
    }
  • [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},
    }
  • 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},
    }
  • 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},
    }
  • T. Lenhard and A. Koelpin, "Sichere und interaktive Steuerung von Produktionsanlagen durch vernetzte Umfeldsensoren" in MikroSystemTechnik Kongress (MST), Karlsruhe, 2015, pp. 1-2. [Bibtex]
    @inproceedings{lenhard2015,
    abstract = {Im Rahmen der Initiative Industrie 4.0 ist eines der Hauptthemen das dynamische Reagieren von bislang unflexiblen Produktionseinrichtungen auf wechselnde Anforderungen und Umgebungseinflüsse. In Zusammenarbeit mit der Universität Erlangen-Nürnberg und den Industriepartnern Siemens CT und Schnaithmann GmbH entwickelt die InnoSenT GmbH ein cyber-physisches Sensorsystem, das alle Distanzinformationen liefert, um in Echtzeit eine Interaktion zwischen Mensch und Maschine oder zwischen mehreren Maschinen zu ermöglichen [1]. Basis des Sensorkonzeptes ist ein universeller interferometrischer Radarsensor mit konfigurierbarer Antenne und einer Messgenauigkeit im Sub-mm-Bereich. Die Arbeiten beinhalten die Entwicklung einer speziellen integrierten Schaltung (MMIC) und neuartiger Packaging-Konzepte.},
    author = {Lenhard, Thilo and Koelpin, Alexander},
    publisher = {VDE},
    booktitle = {MikroSystemTechnik Kongress (MST)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060168},
    year = {2015},
    month = {10},
    day = {26},
    eventdate = {2015-10-26/2015-10-28},
    faupublication = {yes},
    isbn = {9783800741007},
    keywords = {Radar; SAR},
    pages = {1--2},
    peerreviewed = {Yes},
    title = {Sichere und interaktive Steuerung von Produktionsanlagen durch vernetzte Umfeldsensoren},
    venue = {Karlsruhe},
    }
  • 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. 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] 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] 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. 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},
    }
  • 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] G. Vinci, T. Lenhard, C. Will, and A. Koelpin, "Microwave Interferometer Radar-Based Vital Sign Detection for Driver Monitoring Systems" in IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), Heidelberg, Germany, 2015. [Bibtex]
    @inproceedings{vinci2015,
    abstract = {Autonomous driving is a topic of great importance for our society and is expected to be introduced in the automotive market in a couple of decades. Today, vehicles can already autonomously brake and accelerate in order to avoid crashes with obstacles detected by camera and radar technology. The next step towards autonomous driving is the introduction of driver health monitoring systems. Intensive research is being conducted in this field with the goal of developing a ”biometric driver seat”. In this paper, an interferometric radar-based vital sign detection is presented. The aim is to investigate the applicability of radar technology for vital sign monitoring such as heartbeat and breath rate of the driver with sensors embedded in the seat. The proposed interferometric radar is based on the Six-Port receiver technique and shows excellent performance for the addressed application.},
    author = {Vinci, Gabor and Lenhard, Thilo and Will, Christoph and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060208},
    year = {2015},
    month = {04},
    doi = {10.1109/ICMIM.2015.7117940},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Microwave Interferometer Radar-Based Vital Sign Detection for Driver Monitoring Systems},
    type = {Konferenzschrift},
    venue = {Heidelberg, Germany},
    }
  • [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] 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},
    }
  • [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},
    }
  • 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] 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] 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] 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] 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] T. Nowak, A. Koelpin, F. Dressler, M. Hartmann, L. Patino-Studencki, and J. Thielecke, "Combined Localization and Data Transmission in Energy-Constrained Wireless Sensor Networks" in IEEE Topical Conference on Wireless Sensors and Sensor Networks, San Diego, CA, USA, 2015, pp. 4-6. [Bibtex]
    @inproceedings{nowak2015,
    author = {Nowak, Thorsten and Koelpin, Alexander and Dressler, Falko and Hartmann, Markus and Patino-Studencki, Lucila and Thielecke, Jörn},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1026315},
    year = {2015},
    month = {01},
    day = {25},
    doi = {10.1109/WISNET.2015.7127395},
    eventdate = {2015-01-25/2015-01-28},
    faupublication = {yes},
    pages = {4--6},
    title = {Combined Localization and Data Transmission in Energy-Constrained Wireless Sensor Networks},
    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] 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},
    }
  • [DOI] 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},
    doi = {10.1109/ICC.2015.7249335},
    faupublication = {no},
    peerreviewed = {Yes},
    title = {Protocol Design for Ultra-Low Power Wake-Up Systems for Tracking Bats in the Wild},
    type = {Konferenzschrift},
    url = {http://www.ccs-labs.org/bib/dressler2015protocol/dressler2015protocol.pdf},
    }

2014

  • [DOI] S. O. Tatu, A. Serban, M. Helaoui, and A. Koelpin, "Multiport Technology: The New Rise of an Old Concept", IEEE Microwave Magazine, vol. 15, iss. 7, pp. 34-44, 2014. [Bibtex]
    @article{tatu2014a,
    author = {Tatu, Serioja Ovidiu and Serban, Adriana and Helaoui, Mohamed and Koelpin, Alexander},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060062},
    year = {2014},
    month = {11},
    doi = {10.1109/MMM.2014.2356149},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {7},
    pages = {34--44},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Multiport Technology: The New Rise of an Old Concept},
    volume = {15},
    }
  • [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. 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] 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] 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] 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] 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] 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},
    }
  • 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] G. Vinci, S. Linz, and A. Koelpin, "Estimation Error Analysis and Compensation of Dual Six-Port based DOA Detection" in 2014 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Palm Beach, Aruba, 2014, pp. 217-220. [Bibtex]
    @inproceedings{vinci2014a,
    author = {Vinci, Gabor and Linz, Sarah and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {2014 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060118},
    year = {2014},
    month = {08},
    doi = {10.1109/APWC.2014.6905543},
    eventtitle = {2014 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)},
    faupublication = {yes},
    isbn = {9781467356909},
    keywords = {DOA; Dual Six-Port},
    pages = {217--220},
    peerreviewed = {Yes},
    title = {Estimation Error Analysis and Compensation of Dual Six-Port based DOA Detection},
    venue = {Palm Beach, Aruba},
    }
  • [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. 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] S. O. Tatu, A. Serban, A. Koelpin, and M. Helaoui, "Multiport Technology: New Perspectives and Applications", Journal of Electrical and Computer Engineering, vol. 2014, iss. Article ID 194649, pp. 1-4, 2014. [Bibtex]
    @article{tatu2014,
    author = {Tatu, Serioja Ovidiu and Serban, Adriana and Koelpin, Alexander and Helaoui, Mohamed},
    publisher = {Hindawi Publishing Corporation},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060057},
    year = {2014},
    month = {07},
    doi = {10.1155/2014/194649},
    faupublication = {yes},
    issn = {2090-0147},
    journaltitle = {Journal of Electrical and Computer Engineering},
    keywords = {Six-Port},
    number = {Article ID 194649},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Multiport Technology: New Perspectives and Applications},
    volume = {2014},
    }
  • 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] 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 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] 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},
    }
  • [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},
    }
  • 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},
    }
  • 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] 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},
    }
  • 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},
    }
  • 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},
    }
  • 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},
    }
  • [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},
    }
  • [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},
    }
  • [DOI] T. Nowak, M. Hierold, A. Koelpin, M. Hartmann, H. Tröger, and J. Thielecke, "System and Signal Design for an Energy-efficient Multi-frequency Localization System" in WiSNet 2014 - Proceedings: 2014 IEEE Topical Conference on Wireless Sensors and Sensor Networks, Newport, 2014, p. accepted. [Bibtex]
    @inproceedings{nowak2014,
    abstract = {In this paper a concept for an energy-efficient multi-frequency localization system is proposed. The system design aims at extremely light-weight, and thus energy-efficient tags. The localization system is realized by a Wireless Sensor Network comprising signal strength and phase measurements. The concept is based on signals for phase-based ranging. The proposed signals have to meet several constraints: low-power signal generation, efficient signal pro-cessing, and, most important, precise range estimation. The performance of the range estimation is assessed utilizing the Cramér-Rao Lower Bound. © 2014 IEEE.},
    author = {Nowak, Thorsten and Hierold, Martin and Koelpin, Alexander and Hartmann, Markus and Tröger, Hans-Martin and Thielecke, Jörn},
    publisher = {IEEE Computer Society},
    booktitle = {WiSNet 2014 - Proceedings: 2014 IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/1026052},
    year = {2014},
    month = {01},
    day = {19},
    doi = {10.1109/WISNET.2014.6825497},
    eventdate = {2014-01-19/2014-01-22},
    eventtitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    faupublication = {yes},
    keywords = {localization; multi-frequency; phase-based ranging; Wireless sensor network},
    pages = {accepted},
    title = {System and Signal Design for an Energy-efficient Multi-frequency Localization System},
    venue = {Newport},
    }
  • [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. 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] 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},
    }

2013

  • 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},
    }
  • 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. 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] 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},
    }
  • [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},
    }
  • 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},
    }
  • 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},
    }
  • 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},
    }
  • [DOI] 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},
    doi = {10.23919/EUMC.2013.6686691},
    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},
    venue = {Nürnberg},
    }
  • 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},
    }
  • 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},
    }
  • 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},
    }
  • [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},
    }
  • 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},
    }
  • 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, 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},
    }
  • [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},
    }
  • 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},
    }
  • [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] 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] 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] 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},
    }
  • 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. 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 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},
    }
  • A. Koelpin, "Industrial Modal Analysis: Measuring Vibrations in Harsh Environments by Six-Port Technology" in Radar, Communication and Measurement (RADCOM), Hamburg, Germany, 2013. [Bibtex]
    @inproceedings{koelpin2013,
    author = {Koelpin, Alexander},
    publisher = {GEROTRON COMMUNICATION GmbH},
    booktitle = {Radar, Communication and Measurement (RADCOM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059992},
    year = {2013},
    month = {04},
    day = {24},
    eventdate = {2013-04-24/2013-04-25},
    faupublication = {yes},
    keywords = {Six-Port; Vibration},
    peerreviewed = {No},
    title = {Industrial Modal Analysis: Measuring Vibrations in Harsh Environments by Six-Port Technology},
    venue = {Hamburg, Germany},
    }
  • 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},
    }
  • [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, "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] 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] 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

  • [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},
    }
  • G. Vinci, S. Lindner, F. Barbon, M. Hofmann, G. Fischer, D. Kissinger, and A. Koelpin, "24 GHz Six-Port Medical Radar for Contactless Respiration Detection and Heartbeat Monitoring" in 9th European Radar Conference, Amsterdam, Netherlands, 2012. [Bibtex]
    @inproceedings{vinci2012f,
    abstract = {For numerous medical applications it is of primary interest to monitor the breath rate and heartbeat of a patient over time. Especially important is to observe the respiration of a patient over night to detect potential sleep disorders. Furthermore, heartbeat frequency is also a precious informationwhich can help to improve diverse diagnosis procedures. In orderto better analyze these vital parameters an innovative contactlessrespiration detection and heartbeat monitoring technique hasbeen developed. This novel method is based on the six-portinterferometric radar and is capable of detecting breath rateas well as heartbeat frequency without applying sensors orelectrodes on the patients body.},
    author = {Vinci, Gabor and Lindner, Stefan and Barbon, Francesco and Hofmann, Maximilian and Fischer, Georg and Kissinger, Dietmar and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {9th European Radar Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059790},
    year = {2012},
    month = {10},
    faupublication = {yes},
    keywords = {Six-Port; Bioradar; Vital Sign Monitoring; Heartbeat Detection; Respiration Detection},
    peerreviewed = {Yes},
    title = {24 GHz Six-Port Medical Radar for Contactless Respiration Detection and Heartbeat Monitoring},
    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},
    }
  • [DOI] 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{lindner2012,
    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},
    doi = {10.23919/EUMC.2012.6459216},
    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},
    venue = {Amsterdam, Netherlands},
    }
  • [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},
    }
  • [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},
    }
  • 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] 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},
    }
  • 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},
    }
  • [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] 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},
    }
  • 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},
    }
  • A. Ferizi and A. Koelpin, "Baseband Signal Processing for Wireless Sensor Nodes with Capability of FMCW Local Positioning" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, DE, 2012. [Bibtex]
    @inproceedings{ferizi2012a,
    author = {Ferizi, Alban and Koelpin, Alexander},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059786},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Baseband Signal Processing for Wireless Sensor Nodes with Capability of FMCW Local Positioning},
    venue = {Ulm, DE},
    }
  • [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},
    }
  • A. Koelpin, "Ueberblick 6-Tor Technologie in der Positionstechnik" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, DE, 2012. [Bibtex]
    @inproceedings{koelpin2012c,
    author = {Koelpin, Alexander},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059810},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ueberblick 6-Tor Technologie in der Positionstechnik},
    venue = {Ulm, DE},
    }
  • 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] 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] 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},
    }
  • 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},
    }
  • 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] A. Ferizi, B. Höher, M. Jung, G. Fischer, and A. Koelpin, "Design and Implementation of a Fixed-Point Radix-4 FFT Optimized for Local Positioning in Wireless Sensor Networks" in 9th International Multi-Conference on Systems, Signals & Devices, Chemnitz, Germany, 2012. [Bibtex]
    @inproceedings{ferizi2012,
    author = {Ferizi, Alban and Höher, Bernhard and Jung, Melanie and Fischer, Georg and Koelpin, Alexander},
    booktitle = {9th International Multi-Conference on Systems, Signals & Devices},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059727},
    year = {2012},
    month = {03},
    doi = {10.1109/SSD.2012.6197958},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Design and Implementation of a Fixed-Point Radix-4 FFT Optimized for Local Positioning in Wireless Sensor Networks},
    venue = {Chemnitz, Germany},
    }
  • [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] 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] 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},
    }
  • [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] 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},
    }

2011

  • 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},
    }
  • 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},
    }
  • [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},
    }
  • S. Schröter, L. Zimmermann, O. Schwender, G. Fischer, and A. Koelpin, "Demonstrator of a Scanning Receiver Subsystem for Cognitive Professional Wireless Microphone Systems" in Technical Symposium at ITU Telecom World 2011, Geneva, Switzerland, 2011, pp. 193-198. [Bibtex]
    @inproceedings{schroeter2011,
    abstract = {ProfessionalWireless Microphone Systems (PWMS), transmitting voice and music in live events such as concerts or conferences, demand the highest level of sound quality and reliability. Dropouts, noise and interference have to be prevented at any moment of the transmission. At present, these requirements can be fulfilled as PWMS utilize locally unused TV channels and thus operate in a protected radio environment. However, in the near future, the “Digital Dividend” will open the spectrum to other users, leading to less spectrum allocation to PWMS. In order to maintain the high quality of service of the radio links, the Specialist Task Force STF386 on Cognitive Programme Making and Special Events (C-PMSE) of the European Telecommunications Standards Institute (ETSI) proposed a proactive cognitive approach. A major part of this proposition is a Scanning Receiver Subsystem (SCS) that monitors the current spectrum occupation according to which a Cognitive Engine can dynamically configure the radio links. The SCS is composed of multiple Scanning Receivers (SCR) that measure the spectrum occupation at different locations within an event site and one or more Scanning Receiver Controllers (SCC). The SCC combine these observations to determine positions of interferers and estimate their future locations as well as their impact on the microphone links. This paper reviews the current activities of ETSI for standardization of a cognitive wireless microphone system with an in depth focus on the scanning receiver subsystem. Furthermore, the hardware of a low-cost scanning receiver, which has been developed and tested at our institute, is presented. The proposed receiver architecture fulfills the spectrum sensing capabilities recommended by ETSI and can be built at an affordable price, allowing the described proactive cognitive radio system to be realized.},
    author = {Schröter, Simon and Zimmermann, Lars and Schwender, O. and Fischer, Georg and Koelpin, Alexander},
    booktitle = {Technical Symposium at ITU Telecom World 2011},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059292},
    year = {2011},
    month = {10},
    faupublication = {yes},
    isbn = {9781457711480},
    pages = {193--198},
    peerreviewed = {unknown},
    title = {Demonstrator of a Scanning Receiver Subsystem for Cognitive Professional Wireless Microphone Systems},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6100954},
    venue = {Geneva, Switzerland},
    }
  • 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] 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},
    }
  • 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},
    }
  • M. Gardill, S. Zorn, R. Weigel, and A. Koelpin, "Influencing Cell Reselection of UMTS User Equipment using Interference Injection" in RadCom, Hamburg, Germany, 2011. [Bibtex]
    @inproceedings{gardill2011a,
    author = {Gardill, Markus and Zorn, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {RadCom},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059327},
    year = {2011},
    month = {04},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Influencing Cell Reselection of UMTS User Equipment using Interference Injection},
    venue = {Hamburg, Germany},
    }
  • G. Vinci, B. Waldmann, R. Weigel, and A. Koelpin, "An ultrawideband antenna for FMCW-radar positioning systems" in 5th European Conference on Antennas and Propagation, Rome, Italy, 2011, pp. 372-374. [Bibtex]
    @inproceedings{vinci2011a,
    abstract = {The imminent widespread commercial deployment of ultra-wideband (UWB) systems has sparked renewed interest in the subject of ultra-wideband antennas. A field where UWB systems are required is local positioning. These solutions, based on Frequency Modulated Continuous Wave (FMCW) radar principle require a broadband RF system to allow the radar to sweep the entire frequency ramp. For these purposes, low-cost, compact and robust UWB antennas are needed. This document describes a novel planar UWB antenna of the type “Monopole-Over-Ground”, that delivers good performance in the large frequency range of interest, low cost, small dimensions and robustness},
    author = {Vinci, Gabor and Waldmann, Benjamin and Weigel, Robert and Koelpin, Alexander},
    booktitle = {5th European Conference on Antennas and Propagation},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059295},
    year = {2011},
    month = {04},
    faupublication = {yes},
    isbn = {9781457702501},
    pages = {372--374},
    peerreviewed = {unknown},
    title = {An ultrawideband antenna for FMCW-radar positioning systems},
    venue = {Rome, Italy},
    }
  • M. Gardill, S. Zorn, R. Weigel, and A. Koelpin, "Triggering UMTS user equipment inter-RAT cell reselection using noise jammers" in German Microwave Conference, Darmstadt, Germany, 2011, pp. 1-4. [Bibtex]
    @inproceedings{gardill2011,
    abstract = {In this work a strategy for triggering an interradio access technology cell reselection in UMTS user equipment is proposed. All mobile devices within the effective range of a transmitter radiating a noise-like RF signal on the UMTS downlink frequency bands are forced to leave the UMTS cells and camp on non-UMTS cells, such as e.g., GSM. This allows to use a GSM based localization technique even in areas with UMTS coverage. In contrast to classical RF communication jammers which focus on disrupting the communication link, our exclusive goal is to trigger the inter-RAT cell reselection to GSM. In particular we estimate the necessary jammer RF power by examining the cell reselection procedure running in the user equipment (UE) and using some exemplary geographical scenarios. We use a hardware system to proof the results. Index Terms IEEE Terms 3G mobile communication , GSM , Interference , Jamming , Mobile handsets , Noise , Radio frequency INSPEC Controlled Indexing 3G mobile communication , cellular radio , jamming , radio links , radio transmitters Non Controlled Indexing GSM based localization , RF communication jammer , UMTS cell , UMTS coverage , UMTS downlink frequency band , UMTS user equipment , communication link , geographical scenario , interRAT cell reselection , interradio access technology , jammer RF power , mobile device , noise jammer , noise-like RF signal , transmitter Author Keywords UMTS , cell reselection , jammer References S. Zorn, R. Rose, A. Goetz, and R. Weigel, "A novel technique for mobile phone localization for search and rescue applications," in 2010 International Conference on Indoor Positioning and Indoor Navigation (IPIN), Sep. 2010, pp. 1-4. Abstract |Full Text: PDF (1079KB) User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode, 3rd Generation Partnership Project Std. TS 25.304, Rev. 9.0.0, 2009. Physical layer - Measurements (FDD), 3rd Generation Partnership Project Std. TS 25.215, Rev. 9.0.0, 2009. S.-F. Su, The UMTS air-interface in RF engineering: design and operation of UMTS networks. Mcgraw-Hill Professional, 2007. ON THIS PAGE Abstract Index Terms References Brought to you by Universitatsbibliothek Erlangen Nurnberg Your institute subscribes to: IEEE/IET Electronic Library (IEL), VDE VERLAG Conference Proceedings What can I access? Terms of Use},
    author = {Gardill, Markus and Zorn, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059290},
    year = {2011},
    month = {03},
    faupublication = {yes},
    isbn = {9781424492251},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Triggering UMTS user equipment inter-RAT cell reselection using noise jammers},
    venue = {Darmstadt, Germany},
    }
  • M. Hofmann, S. Winkler, R. Weigel, K. Wu, and A. Koelpin, "Voltage controlled oscillator with frequency tripler in MHMIC technology for V-Band applications" in German Microwave Conference, Darmstadt, Germany, 2011, pp. 1-4. [Bibtex]
    @inproceedings{hofmann2011a,
    abstract = {A voltage controlled oscillator (VCO) for V-Band applications in miniaturized hybrid integrated circuit (MHMIC) technology is proposed. The introduced circuit is designed to provide its third harmonics in the unlicensed frequency band around 60 GHz. The underlying concept is based on a negative resistance oscillator (NRO), centered at 20 GHz and driven by a PHEMT Transistor. A 3 GHz tuning range is achieved by a voltage controlled load-network, which consists of a hybrid assembled varactor diode at the transistor drain electrode. The fundamental frequency is intended to drive a resistive frequency tripler. Two concepts, consisting of a single diode and a antiparallel diode multiplier are compared with -23 dB and -15.5 dB conversion gain, respectively.},
    author = {Hofmann, Maximilian and Winkler, S. and Weigel, Robert and Wu, Ke and Koelpin, Alexander},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059276},
    year = {2011},
    month = {03},
    faupublication = {yes},
    isbn = {9781424492251},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Voltage controlled oscillator with frequency tripler in MHMIC technology for V-Band applications},
    venue = {Darmstadt, Germany},
    }
  • G. Vinci, F. Barbon, R. Weigel, and A. Koelpin, "A high accuracy Direction-Of-Arrival and Misalignment Angle Detector" in German Microwave Conference, Darmstadt, 2011, pp. 1-3. [Bibtex]
    @inproceedings{vinci2011,
    abstract = {High-precision Direction-Of-Arrival measurements are often a challenge. The need to accurately detect the angle of incidence of an incoming electromagnetic wave with respect to a reference geometrical axis is very important for automotive and security applications. Furthermore, the ability to measure a misalignment angle of a transmitting antenna in respect to a reference is a task required by countless industrial applications. A high accuracy angle-detection system is hereby presented and measurement results from a prototype detecting a 24 GHz source are shown.},
    author = {Vinci, Gabor and Barbon, Francesco and Weigel, Robert and Koelpin, Alexander},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059287},
    year = {2011},
    month = {03},
    day = {14},
    eventdate = {2016-03-14/2016-03-16},
    faupublication = {yes},
    isbn = {9783981266832},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {A high accuracy Direction-Of-Arrival and Misalignment Angle Detector},
    venue = {Darmstadt},
    }

2010

  • G. Vinci, A. Koelpin, F. Barbon, and R. Weigel, "Six-Port-Based Direction-Of-Arrival Detection System" in Asia-Pacific Microwave Conference, Yokohama, Japan, 2010, pp. 1817-1820. [Bibtex]
    @inproceedings{vinci2010a,
    abstract = {Direction-Of-Arrival (DOA) detection is a fundamental procedure required by several monitoring and tracking systems for defense purposes and other security applications as well as industrial monitoring and measurement. The ability of a system to accurately determine the incident angle of an arbitrary electromagnetic wave incoming toward the observer device is an important as well as challenging task especially when low-cost and robustness are also key points for the overall tracking and detection or surveillance solution. Phase-measurement based DOA detection is commonly used in nowadays systems, but existing methods are based on traditional mixer architectures or expensive direct conversion devices increasing complexity and cost while compromising robustness. In this paper an innovative, robust and accurate technique is proposed to perform the DOA detection by means of Six-Port based Phase Measurement Detection.},
    author = {Vinci, Gabor and Koelpin, Alexander and Barbon, Francesco and Weigel, Robert},
    booktitle = {Asia-Pacific Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059036},
    year = {2010},
    month = {12},
    faupublication = {yes},
    isbn = {9781424475902},
    pages = {1817--1820},
    peerreviewed = {unknown},
    title = {Six-Port-Based Direction-Of-Arrival Detection System},
    venue = {Yokohama, Japan},
    }
  • [DOI] A. Koelpin, G. Vinci, B. Lämmle, D. Kissinger, and R. Weigel, "The Six-Port in Modern Society", IEEE Microwave Magazine, vol. 11, iss. 7, pp. 35-43, 2010. [Bibtex]
    @article{koelpin2010a,
    abstract = {Modern wireless sensing and communication systems are often based on high bandwidth and high carrier frequencies. In the range beyond 100 GHz, common receiver architectures, like active homodyne or heterodyne receivers, have an issue with the amplification needed for mixing. Also, high bandwidth is a problem for these systems. In this context, the six-port receiver is a good alternative, just as well as for lowvolume markets. The six-port concept is based on the additive superposition of the two RF input signals using four different relative phases leading to constructive or destructive interaction. The resulting signals are directly downconverted to baseband by diode circuits operated in detector or mixing mode. The complexvalued information can be easily reconstructed from the four baseband voltages. Historic evolution leads from the reflectometer approach for an alternative vector network analyzer to receivers for sensing and communications. A recent topic is the technology gap in automotive workshops for adjusting the long-range radar sensor of a car. Here, the six-port concept as alignment tool is a good choice, because of its excellent phase resolution. Currently, the integration of the six-port receiver on a MMIC for frequencies beyond 100 GHz is the focus of current work and will be intensified in the future. Will the six-port concept replace common active homodyne and heterodyne receivers? No, but it is a serious alternative for millimeter-wave frequencies and ultrahigh-bandwidth applications in wireless sensing and communication systems. This modern concept can tap new markets for both wireless sensors and sensor networks.},
    author = {Koelpin, Alexander and Vinci, Gabor and Lämmle, Benjamin and Kissinger, Dietmar and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059054},
    year = {2010},
    month = {12},
    doi = {10.1109/MMM.2010.938584},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {Antenna measurements; Bandwidth; Baseband; Digital signal processing; Mobile radio mobility management; Receivers; Wireless sensor networks},
    number = {7},
    pages = {35--43},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {The Six-Port in Modern Society},
    volume = {11},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, A. Koelpin, and R. Weigel, "Directional Couplers from 30 to 140 GHz in Silicon" in Asia-Pacific Microwave Conference (APMC 2010), Yokohama, Japan, 2010, pp. 806-809. [Bibtex]
    @inproceedings{laemmle2010c,
    abstract = {In this paper directional couplers with reduced size, by lumped elements, inverted microstrip, and broadside coupled lines at 61, 110, and 122 GHz center frequency and up to 156-GHz bandwidth have been designed. The couplers show an isolation up to 40 dB. Different SiGe BiCMOS technologies with 250-nm and 130-nm feature width and 5 to 7 metal layers have been used. The measurement results have been compared to simulation results and good agreement has been observed.},
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Asia-Pacific Microwave Conference (APMC 2010)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059047},
    year = {2010},
    month = {12},
    faupublication = {yes},
    isbn = {9781424475902},
    keywords = {Directional couplers; BiCMOS integrated circuits; SiGe BiCMOS technologies; broadside coupled lines; inverted microstrip; silicon; bandwidth; millimeter wave directional couplers; passive circuits},
    pages = {806--809},
    peerreviewed = {unknown},
    title = {Directional Couplers from 30 to 140 GHz in Silicon},
    url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5728463},
    venue = {Yokohama, Japan},
    }
  • B. Lämmle, K. Schmalz, C. Scheytt, A. Koelpin, and R. Weigel, "Future trends of integrated millimeter wave six-port receivers" in 6. Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC 2010), Berlin, Germany, 2010. [Bibtex]
    @inproceedings{laemmle2010b,
    author = {Lämmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Koelpin, Alexander and Weigel, Robert},
    booktitle = {6. Joint Symposium on Opto- and Microelectronic Devices and Circuits (SODC 2010)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059046},
    year = {2010},
    month = {10},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Future trends of integrated millimeter wave six-port receivers},
    venue = {Berlin, Germany},
    }
  • A. Koelpin, "Der erweiterte Sechstor-Empfänger – Ein systemübergreifender Ansatz für Kommunikations- und Messaufgaben", 2010. [Bibtex]
    @phdthesis{koelpin2010,
    author = {Koelpin, Alexander},
    institution = {FAU Erlangen-Nürnberg},
    language = {German},
    publisher = {Suedwestdeutscher Verlag fuer Hochschulschriften},
    cris = {https://cris.fau.de/converis/publicweb/publication/1060765},
    year = {2010},
    month = {10},
    day = {11},
    entrysubtype = {Dissertation},
    faupublication = {yes},
    isbn = {9783838120768},
    peerreviewed = {automatic},
    title = {Der erweiterte Sechstor-Empfänger – Ein systemübergreifender Ansatz für Kommunikations- und Messaufgaben},
    type = {Dissertation},
    }

2009

  • [DOI] G. Vinci, A. Koelpin, and R. Weigel, "Employing Six-Port Technology for Phase-Measurement-Based Calibration of Automotive Radar" in Asia Pacific Microwave Conference, , Singapore, 2009, pp. 329-332. [Bibtex]
    @inproceedings{vinci2009a,
    abstract = {Radar technology is today a key feature for the automotive industry and is becoming of greater importance among most car-producers. Its applications range from cruise control, to pre-crash and parking aid systems. Radar units are already being mounted on several automobiles. Such systems employ high-tech devices and state of the art technology, optimized for robustness and reliability. Specific techniques have been developed to build and install radar devices on board of the vehicles. In particular, precise calibration techniques are being used to set the devices and adjust them so to meet the wanted operation requirements. Radar devices used for adaptive cruise control, installed in front of the vehicle to scan the road ahead in the driving path need a particularly fine adjustment to be as reliable as required by the automotive security standards. Calibration issues in nowadays trimming techniques are causing major problems in the employment of such radar systems. In particular, misalignment of the radar cruise control sensor in respect to the driving axis of the vehicle is leading to false interpretations and reading errors. In this paper, a new, innovative and precise calibration technique is proposed to solve the current calibration problems, focusing on a special microwave measurement technique for enhanced accuracy and reliability.},
    author = {Vinci, Gabor and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Asia Pacific Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058970},
    year = {2009},
    month = {12},
    day = {07},
    doi = {10.1109/APMC.2009.5385312},
    eventdate = {2009-12-07/2009-12-10},
    faupublication = {yes},
    keywords = {Six-Port; Automotive Radar; Calibration; Phase Measurement; Interferometer},
    pages = {329--332},
    peerreviewed = {unknown},
    title = {Employing Six-Port Technology for Phase-Measurement-Based Calibration of Automotive Radar},
    venue = {, Singapore},
    }
  • G. Fischer, T. Lautenbacher, A. Koelpin, R. Mzyk, and R. Weigel, "Passive Metamaterial Structures for Use in Microwave and RF Applications" in ITG Topical Meeting New Microwave Materials, Non-Destructive Testing and Short-Range Imaging, Erlangen, 15. October 2009, Erlangen Germany, 2009. [Bibtex]
    @inproceedings{fischer2009a,
    abstract = {Possibilities for improving electrical system properties concerning size reduction, efficiency, multiband operation and tuning by using Metamaterial devices are presented. Two approaches in designing Metamaterial structures, i.e. the resonant type as well as the dual transmission line concept, are demonstrated by examples. With the dual transmission line concept, a dualband 90° Composite Right and Left Handed transmission line (CRLH TL) is implemented for use in dualband hybrid couplers and Wilkinson power dividers. Therefore new design guidelines for reliable functionality and superior performance were established for the stated implementation. The resonant type approach is based on resonant structures comprising of split ring resonators (SRR). Examples of using high-Q split ring resonators in duplex filters and in current switched class-S amplifiers are evaluated. Furthermore different aspects and possibilities in tuning SRRs by using MEMS devices are highlighted.},
    author = {Fischer, Georg and Lautenbacher, Thomas and Koelpin, Alexander and Mzyk, Raphael and Weigel, Robert},
    booktitle = {ITG Topical Meeting New Microwave Materials, Non-Destructive Testing and Short-Range Imaging, Erlangen, 15. October 2009},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058979},
    year = {2009},
    month = {10},
    faupublication = {yes},
    keywords = {Metamaterial; Composite Right and Left Handed CRLH; Dual Transmission Line Concept; Dualband; Hybrid Coupler; Wilkinson Power Divider; Split Ring Resonator SRR; High-Q; Duplex Filter; Class-S Amplifier; Tuning},
    peerreviewed = {unknown},
    title = {Passive Metamaterial Structures for Use in Microwave and RF Applications},
    venue = {Erlangen Germany},
    }
  • [DOI] A. Koelpin, B. Pape, and R. Weigel, "Introducing New Design Guidelines for Dualband CRLH Structures formed by Transmission Lines and Lumped Components" in IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID, Cavtat, Croatia, 2009, pp. 1-4. [Bibtex]
    @inproceedings{koelpin2009,
    abstract = {In this paper a new strategy for designing dualband composite right and left handed (CRLH) structures based on lumped elements is introduced. By using the presented formulars the desired metamaterial devices become easily scalable to arbitrary frequencies as the parasitic elements of the lumped components are considered resulting in three design guidelines. The practical use is shown by a dualband branch line coupler and a Wilkinson power divider operating at 2.5 GHz and 5.25 GHz.},
    author = {Koelpin, Alexander and Pape, Benedikt and Weigel, Robert},
    booktitle = {IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059003},
    year = {2009},
    month = {09},
    doi = {10.1109/IMWS2.2009.5307868},
    faupublication = {yes},
    keywords = {Wilkinson power divider; dualband CRLH structure design guideline; dualband branch line coupler; dualband composite-right-and-left-handed structure; lumped component; metamaterial device; parasitic element; transmission line; UHF couplers; lumped parameter networks; metamaterials; microwave materials; power dividers; telecommunication transmission lines},
    pages = {1--4},
    peerreviewed = {unknown},
    title = {Introducing New Design Guidelines for Dualband CRLH Structures formed by Transmission Lines and Lumped Components},
    venue = {Cavtat, Croatia},
    }
  • A. Wind and A. Koelpin, "Entwurf und Aufbau einer elektromagnetisch geschirmten Messkammer," Diplomarbeit , FAU Erlangen-Nürnberg, 2009. [Bibtex]
    @thesis{wind2009,
    author = {Wind, Adalbert and Koelpin, Alexander},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059006},
    year = {2009},
    entrysubtype = {Diplomarbeit},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Entwurf und Aufbau einer elektromagnetisch geschirmten Messkammer},
    type = {Diplomarbeit},
    }
  • S. Lechner and A. Koelpin, "Modernisieren des Praktikums "Systematischer Entwurf programmierbarer Logikbausteine (PLD)"," Diplomarbeit , FAU Erlangen-Nürnberg, 2009. [Bibtex]
    @thesis{lechner2009,
    author = {Lechner, S. and Koelpin, Alexander},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1059004},
    year = {2009},
    entrysubtype = {Diplomarbeit},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Modernisieren des Praktikums "Systematischer Entwurf programmierbarer Logikbausteine (PLD)"},
    type = {Diplomarbeit},
    }

2008

  • [DOI] S. Winter, A. Koelpin, and R. Weigel, "Six-Port Receiver Analog Front-End: Multilayer Design and System Simulation", IEEE Transactions on Circuits and Systems Ii-Express Briefs, vol. 55, iss. 3, pp. 254-258, 2008. [Bibtex]
    @article{winter2008a,
    abstract = {In this paper, a six-port receiver analog front-end structure based on a Wilkinson power divider and three hybrid couplers is presented, which has been implemented in a multilayered, meandered manner, yielding a size reduction of about 78% compared to a planar design. The measured S-parameters of the new design are in good accordance with simulated S-parameters of the planar structure. System simulations with an orthogonal frequency division multiplexing signal show the suitability of the design for six-port communications receivers.},
    author = {Winter, Sebastian and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058902},
    year = {2008},
    month = {03},
    doi = {10.1109/TCSII.2008.918999},
    faupublication = {yes},
    issn = {1549-7747},
    journaltitle = {IEEE Transactions on Circuits and Systems Ii-Express Briefs},
    keywords = {OFDM modulation; S-parameters; power dividers; radio receivers; S-parameters; Wilkinson power divider; hybrid couplers; planar structure},
    number = {3},
    pages = {254--258},
    peerreviewed = {Yes},
    shortjournal = {IEEE T CIRCUITS-II},
    title = {Six-Port Receiver Analog Front-End: Multilayer Design and System Simulation},
    volume = {55},
    }
  • S. Winter, H. Ehm, A. Koelpin, and R. Weigel, "Six-Port Receiver Local Oscillator Power Selection for Maximum Output SNR" in IEEE Radio Wireless Symposium, 2008, pp. 151-154. [Bibtex]
    @inproceedings{winter2008,
    author = {Winter, Sebastian and Ehm, Henning and Koelpin, Alexander and Weigel, Robert},
    booktitle = {IEEE Radio Wireless Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058900},
    year = {2008},
    month = {01},
    faupublication = {yes},
    pages = {151--154},
    peerreviewed = {unknown},
    title = {Six-Port Receiver Local Oscillator Power Selection for Maximum Output SNR},
    }

2007

  • [DOI] S. Winter, H. Ehm, A. Koelpin, and R. Weigel, "Diode power detector DC operating point in six-port communications receivers" in Microwave Conference, 2007. European, Muinch, 2007, pp. 795-798. [Bibtex]
    @inproceedings{winter2007a,
    abstract = {In this paper a diode power detector circuit is investigated for application in a six-port communications receiver. The diode behavior is modeled by the fundamental diode equation, which is solved for the output DC operating point applying an expansion theorem of modified Bessel functions for the exponential function. The results are compared with a Harmonic Balance system simulation and the closely matching results show that the assumptions made to find the numerical solution hold true.},
    author = {Winter, Sebastian and Ehm, Henning and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {Microwave Conference, 2007. European},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058292},
    year = {2007},
    month = {10},
    doi = {10.1109/EUMC.2007.4405312},
    faupublication = {yes},
    keywords = {DC operating point; Schottky diode frequency converters; Schottky diode power detectors; six-port communications receiver; Circuit simulation; Detectors; Equations; Filters; Frequency conversion; Microwave communication; RF signals; Radio frequency},
    pages = {795--798},
    peerreviewed = {unknown},
    title = {Diode power detector DC operating point in six-port communications receivers},
    venue = {Muinch},
    }
  • [DOI] S. Winter, H. Ehm, A. Koelpin, and R. Weigel, "Analysis of System Parameters of a Six-Port Communications Receiver with Analog I/Q Regeneration" in International Symposium on Signals, Systems and Electronics, 2007. ISSSE '07, 2007, pp. 375-378. [Bibtex]
    @inproceedings{winter2007,
    abstract = {In this paper system level parameters for the compression behavior as well as second and third order distortions of a six-port communications receiver with analog I/Q regeneration are determined by system simulations. The parameter values are qualified for a range of local oscillator (LO) signal powers. A recommendation for a well-suited LO signal power is derived from the resulting parameter plot. The recommended LO signal power is supported by investigation of the receiver's conversion efficiency. The results are also valid for other ways of I/Q regeneration based on passive mixing.},
    author = {Winter, Sebastian and Ehm, Henning and Koelpin, Alexander and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {International Symposium on Signals, Systems and Electronics, 2007. ISSSE '07},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058267},
    year = {2007},
    month = {08},
    doi = {10.1109/ISSSE.2007.4294491},
    faupublication = {yes},
    pages = {375--378},
    peerreviewed = {unknown},
    title = {Analysis of System Parameters of a Six-Port Communications Receiver with Analog I/Q Regeneration},
    }
  • [DOI] A. Koelpin, S. Winter, and R. Weigel, "A Six-Port Receiver's Analog Front-End of Reduced Size Based on a Multi-Layer Layout" in IEEE/MTT-S International Microwave Symposium, 2007, 2007, pp. 1011-1014. [Bibtex]
    @inproceedings{koelpin2007a,
    abstract = {In this paper a compact front-end of a six-port receiver is presented based on a multi-layer circuit topology. For higher frequencies the six-port receiver architecture offers a good alternative to common receiver concepts. One drawback is the occupied size of the microwave couplers used in the analog front-end depending normally directly on the wave length and is opposed to an implementation of the passive six-port structure on a MMIC. With the results of the investigations presented in this paper a reduction in size of the six-port's transmission line structure of about 79% is achievable. The performance of the proposed multi-layer structure is compared to the common planar topology and shows only slight degradation.},
    author = {Koelpin, Alexander and Winter, Sebastian and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE/MTT-S International Microwave Symposium, 2007},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058289},
    year = {2007},
    month = {07},
    doi = {10.1109/MWSYM.2007.380227},
    faupublication = {yes},
    pages = {1011--1014},
    peerreviewed = {unknown},
    title = {A Six-Port Receiver's Analog Front-End of Reduced Size Based on a Multi-Layer Layout},
    }
  • A. Koelpin, S. Winter, and R. Weigel, "A Compact Multi-Layer Analog Front-End of a Six-Port Receiver" in 23rd Annual Review of Progress in Applied Computational Electromagnetics, Verona, Italy, 2007, pp. 199-204. [Bibtex]
    @inproceedings{koelpin2007,
    abstract = {The focus of this work lies on a new compact layout of the analog front-end of a six-port receiver. One drawback of this receiver architecture is its large physical dimension, which makes it hard to fabricate it as a monolithic microwave circuit (MMIC). In this paper the theoretical aspects of the system concept will be shown and a new folded multi-layer layout of the passive analog structure will be presented. The new design is compared to the classic planar layout.},
    author = {Koelpin, Alexander and Winter, Sebastian and Weigel, Robert},
    booktitle = {23rd Annual Review of Progress in Applied Computational Electromagnetics},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058315},
    year = {2007},
    month = {03},
    faupublication = {yes},
    keywords = {six-port; multi-layer},
    pages = {199--204},
    peerreviewed = {unknown},
    title = {A Compact Multi-Layer Analog Front-End of a Six-Port Receiver},
    venue = {Verona, Italy},
    }

2006

  • A. Koelpin, "Six-Port Receiver Analog Front-End for Direct Conversion" in Proceedings of the 1st Chinese-German Summer School (Embedded Systems and Materials - Research for Advanced Applications), Shanghai, China, 2006, pp. 340-345. [Bibtex]
    @inproceedings{koelpin2006a,
    author = {Koelpin, Alexander},
    booktitle = {Proceedings of the 1st Chinese-German Summer School (Embedded Systems and Materials - Research for Advanced Applications)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058183},
    year = {2006},
    month = {09},
    faupublication = {yes},
    pages = {340--345},
    peerreviewed = {unknown},
    title = {Six-Port Receiver Analog Front-End for Direct Conversion},
    venue = {Shanghai, China},
    }
  • [DOI] A. Koelpin, S. Winter, T. Eireiner, and R. Weigel, "A Sixport Receiver's Analog Front-End for the K-Band Based on a Rapid-Prototyped PCB" in IEEE Mediterranean Electrotechnical Conference, Malaga, Spain, 2006, pp. 360-362. [Bibtex]
    @inproceedings{koelpin2006,
    abstract = {Within the scope of the research project presented in this paper an alternative architecture to mixing based receivers like hetero- or homodyne receivers is investigated: the sixport receiver. The theoretical aspects of the system concept are shown and the structure of the analog front-end is presented supported by measurement results. The analog front-end is based on a microwave circuit with a carrier frequency of 24 GHz and constructed as a PCB milled by a circuit board plotter.},
    author = {Koelpin, Alexander and Winter, Sebastian and Eireiner, Thomas and Weigel, Robert},
    publisher = {IEEE},
    booktitle = {IEEE Mediterranean Electrotechnical Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058228},
    year = {2006},
    month = {05},
    doi = {10.1109/MELCON.2006.1653113},
    faupublication = {yes},
    isbn = {9781424400874},
    keywords = {Six-Port; Frontend},
    number = {9054944},
    pages = {360--362},
    peerreviewed = {unknown},
    title = {A Sixport Receiver's Analog Front-End for the K-Band Based on a Rapid-Prototyped PCB},
    venue = {Malaga, Spain},
    }
  • A. Schedel, A. Koelpin, and R. Weigel, "Erstellen des Praktikums zu Architekturen der Digitalen Signalverarbeitung - Systemsimulation mit Matlab," , FAU Erlangen-Nürnberg, 2006. [Bibtex]
    @thesis{schedel2006,
    author = {Schedel, Andreas and Koelpin, Alexander and Weigel, Robert},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058235},
    year = {2006},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Erstellen des Praktikums zu Architekturen der Digitalen Signalverarbeitung - Systemsimulation mit Matlab},
    }
  • D. Glaser, A. Koelpin, and R. Weigel, "Ausarbeitung eines Praktikums zur Vorlesung Architekturen der Digitalen Signalverarbeitung, VHDL Programmierung, Simulation und Inbetriebnahme," , FAU Erlangen-Nürnberg, 2006. [Bibtex]
    @thesis{glaser2006,
    author = {Glaser, Daniel and Koelpin, Alexander and Weigel, Robert},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058189},
    year = {2006},
    faupublication = {yes},
    peerreviewed = {No},
    title = {Ausarbeitung eines Praktikums zur Vorlesung Architekturen der Digitalen Signalverarbeitung, VHDL Programmierung, Simulation und Inbetriebnahme},
    }

2005

  • A. Koelpin, S. Winter, and T. Eireiner, "Aufbau eines Sechtor-Empfängers als innovative Alternative zu mischerbasierten Konzepten für das K-Band", 2005. [Bibtex]
    @other{koelpin2005c,
    author = {Koelpin, Alexander and Winter, Sebastian and Eireiner, Thomas},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058127},
    year = {2005},
    month = {10},
    faupublication = {no},
    peerreviewed = {No},
    title = {Aufbau eines Sechtor-Empfängers als innovative Alternative zu mischerbasierten Konzepten für das K-Band},
    type = {Zeitungsartikel},
    }
  • A. Koelpin, S. Winter, T. Eireiner, and R. Weigel, "The Passive Structure of a Sixport-Receiver for the K-Band" in Mediterranean Microwave Symposium (MMS), Athens, Greece, 2005. [Bibtex]
    @inproceedings{koelpin2005b,
    author = {Koelpin, Alexander and Winter, Sebastian and Eireiner, Thomas and Weigel, Robert},
    booktitle = {Mediterranean Microwave Symposium (MMS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058125},
    year = {2005},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {The Passive Structure of a Sixport-Receiver for the K-Band},
    venue = {Athens, Greece},
    }
  • A. Koelpin, S. Winter, and R. Weigel, "A Six-port Receiver Analog Front-End for Direct Conversion Reception in the K-Band" in Proceedings of the European Microwave Association, 2005, pp. 156-161. [Bibtex]
    @inproceedings{koelpin2005a,
    abstract = {In modern radio communication systems high data rates are of great interest for home and business applications. Beside the use of novel techniques like MIMO the demand for bandwidth increases in order to deal with these requirements. Frequency allocation issues and technical aspects shift the carrier frequencies more and more toward microwave frequencies. With shrinking wavelengths and the high performance of today’s digital signal processing devices an alternative receiver architecture starts to compete with heterodyne and homodyne receiver concepts. In this paper the analog front-end of a so-called six-port receiver for the K-band is introduced. In difference to the heterodyne and homodyne concepts the conversion of the RF signal to baseband is done by additive superpositions of the local oscillator’s (LO) signal and the RF with different phase relations. The results are four output signals with different amplitudes generated by constructive and destructive superposition of the two input signals. By evaluating their powers the complex valued information of the sent RF signal can be recovered. The receiver’s hardware complexity is drastically reduced compared to other direct conversion concepts. Theoretical background, design process, practical tips for assembling and measurement results of the passive analog structure of a six-port receiver operating at 24GHz will be presented in this paper.},
    author = {Koelpin, Alexander and Winter, Sebastian and Weigel, Robert},
    booktitle = {Proceedings of the European Microwave Association},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058126},
    year = {2005},
    faupublication = {yes},
    keywords = {six port; direct conversion},
    pages = {156--161},
    peerreviewed = {unknown},
    title = {A Six-port Receiver Analog Front-End for Direct Conversion Reception in the K-Band},
    volume = {1},
    }
  • A. Koelpin, "Entwurf und Realisierung einer Sechstor-Empfänger-Platine für einen Frequenzbereich im K-Band," Diplomarbeit , FAU Erlangen-Nürnberg, 2005. [Bibtex]
    @thesis{koelpin2005,
    author = {Koelpin, Alexander},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/1058166},
    year = {2005},
    entrysubtype = {Diplomarbeit},
    faupublication = {yes},
    keywords = {Six-Port},
    peerreviewed = {No},
    title = {Entwurf und Realisierung einer Sechstor-Empfänger-Platine für einen Frequenzbereich im K-Band},
    type = {Diplomarbeit},
    }

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