Mitarbeiter

Dipl.-Ing. (FH) Christian Musolff

Kontakt

Über Christian Musolff

Arbeitsgebiete

  • Hochfrequenzschaltungstechnik
  • Leistungsverstärker
  • Nichtlineare Netzwerkanalyse

Abschlussarbeiten

Bitte melden, falls Interesse an einem der genannten Arbeitsgebiete besteht.

Preise & Auszeichnungen

  • C. Musolff and M. Kamper, 1st Place High Efficiency Power Amplifier Student Design Competition, IEEE Microwave Theory and Techniques Society, 2015. [Bibtex]
    @prize{musolff_prize_2015,
    author = {Musolff, Christian and Kamper, Michael},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2015},
    year = {2015},
    month = {05},
    day = {22},
    title = {1st Place High Efficiency Power Amplifier Student Design Competition},
    type = {20773-Kleiner Preis},
    }
  • C. Musolff and M. Kamper, 1st Place High Efficiency Power Amplifier Student Design Competition, IEEE Microwave Theory and Techniques Society, 2014. [Bibtex]
    @prize{musolff_prize_2014,
    author = {Musolff, Christian and Kamper, Michael},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2014},
    year = {2014},
    month = {06},
    day = {04},
    title = {1st Place High Efficiency Power Amplifier Student Design Competition},
    type = {20773-Kleiner Preis},
    }
  • C. Musolff, M. Kamper, and Z. Abou-Chahine, Winner Student High Efficiency Power Amplifier Design Competition - International Microwave Symposium, IEEE Microwave Theory and Techniques Society, 2013. [Bibtex]
    @prize{musolff_prize_2013,
    author = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2013},
    year = {2013},
    month = {06},
    day = {21},
    title = {Winner Student High Efficiency Power Amplifier Design Competition - International Microwave Symposium},
    type = {20773-Kleiner Preis},
    }
  • C. Musolff, 1st Place Design Competition High Efficiency Power Amplifier - International Microwave Symposium, IEEE Microwave Theory and Techniques Society, 2012. [Bibtex]
    @prize{musolff_prize_2012,
    author = {Musolff, Christian},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2012},
    year = {2012},
    month = {06},
    day = {21},
    title = {1st Place Design Competition High Efficiency Power Amplifier - International Microwave Symposium},
    type = {20773-Kleiner Preis},
    }
  • C. Musolff, Second Place Student Competition for Low Noise Amplifier Design, IEEE Microwave Theory and Techniques Society, 2009. [Bibtex]
    @prize{musolff_prize_2009a,
    author = {Musolff, Christian},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2009a},
    year = {2009},
    month = {06},
    day = {12},
    title = {Second Place Student Competition for Low Noise Amplifier Design},
    type = {20773-Kleiner Preis},
    }
  • C. Musolff, 2nd Place ASH Receiver Student Design Competition 2010, IEEE Microwave Theory and Techniques Society, 2009. [Bibtex]
    @prize{musolff_prize_2009,
    author = {Musolff, Christian},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2009},
    year = {2009},
    month = {05},
    day = {27},
    title = {2nd Place ASH Receiver Student Design Competition 2010},
    type = {20773-Kleiner Preis},
    }
  • C. Musolff, 1st Place Student Competition for Low-Power Consumption FM Radio Received Design, IEEE Microwave Theory and Techniques Society, 2008. [Bibtex]
    @prize{musolff_prize_2008,
    author = {Musolff, Christian},
    booktitle = {IEEE Microwave Theory and Techniques Society},
    cris = {musolff_prize_2008},
    year = {2008},
    month = {06},
    day = {01},
    title = {1st Place Student Competition for Low-Power Consumption FM Radio Received Design},
    type = {20773-Kleiner Preis},
    }

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

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

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

Publikationen

2018

  • A. Hagelauer, W. Akstaller, C. Musolff, and R. Weigel, "X-Parameter Characterization of SAW and BAW Components - a Review" in Seventh International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems, Chiba, Japan, 2018. [Bibtex]
    @inproceedings{hagelauer2018a,
    abstract = {
    This paper surveys X-Parameter based characterization
    of surface acoustic wave (SAW) and bulk acoustic wave
    (BAW) components. Due to the increased integration of frontend
    modules in mobile devices, the power density in BAW and SAW
    components rises continuously. Furthermore, the demand for
    more frequency bands is required by advanced communication
    techniques. As a result, the probability of significant nonlinear
    emissions disturbing adjacent channels increases. Thus, the
    linearity of individual frontend components becomes more and
    more important. In order to comply with spectral emission masks
    and limitations on spurious emissions imposed by standards
    and specifications, accurate modeling of the device’s response
    is required. In this paper, two measurement setups which
    are based on a nonlinear vector network analyzer (NVNA) are
    utilized in order to characterize BAW and SAW filters. A high
    dynamic range is required because of the low power levels of the
    generated higher order harmonics. Two different measurement
    setup approaches are compared to each other. The application
    of frequency selective attenuators enables an increase of the
    dynamic range by more than 40 dB.
    }, author = {Hagelauer, Amelie and Akstaller, Wolfgang and Musolff, Christian and Weigel, Robert}, language = {English}, booktitle = {Seventh International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems}, cris = {https://cris.fau.de/converis/publicweb/publication/111006104}, year = {2018}, month = {03}, day = {07}, eventdate = {2018-03-06/2018-03-07}, faupublication = {yes}, peerreviewed = {No}, title = {X-Parameter Characterization of SAW and BAW Components - a Review}, type = {Konferenzschrift}, venue = {Chiba, Japan}, }

2017

  • W. Akstaller, C. Musolff, R. Weigel, and A. Hagelauer, "X-Parameter Characterization of TC SAW Filters with Enhanced Dynamic Range", IEEE Transactions on Microwave Theory and Techniques, vol. 65, iss. 11, pp. 4541-4549, 2017. [DOI] [Bibtex]
    @article{akstaller2017,
    abstract = {Increasing the integration of radio frequency frontend modules for mobile communication devices results in rising power densities within the components. Additionally, advanced communication techniques demand for more frequency bands to be supported. As a result, the probability of significant nonlinear emissions disturbing adjacent channels increases, and accurate modeling of the device’s response is required. The X-parameter-based modeling approach can be applied to this problem. In this paper, a measurement setup, which is based on a nonlinear vector network analyzer, is utilized in order to characterize a surface acoustic wave (SAW) filter. Due to the low power levels of the generated higher order harmonics and the demand for a power sweep, a high dynamic range (DR) is required. The application of frequency selective attenuators enables an increase of the effective DR by more than 40 dB. Based on this improved measurement setup, single-tone and two-tone X-parameter models of the SAW filter are created and evaluated for their ability to predict intermodulation distortion (IMD). Classic, scalar IMD measurements are used as a reference for the assessment of capabilities and limitations of both X-parameter approaches.},
    author = {Akstaller, Wolfgang and Musolff, Christian and Weigel, Robert and Hagelauer, Amelie},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/109703704},
    year = {2017},
    month = {11},
    doi = {10.1109/TMTT.2017.2751464},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {Attenuators;Frequency measurement;Harmonic analysis;Mathematical model;Power harmonic filters;Receivers;Surface acoustic waves;Intermodulation distortion (IMD);X-parameter;nonlinearity;surface acoustic wave (SAW) filter},
    number = {11},
    pages = {4541--4549},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {X-Parameter Characterization of TC SAW Filters with Enhanced Dynamic Range},
    type = {Article in Journal},
    volume = {65},
    }

2016

  • G. Donati, C. Musolff, G. Gottardo, D. Popp, and G. Fischer, "Physically inspired digital predistortion for doherty power ampliers and automatic in-situ identication" in Fifth International Conference on Telecommunications and Remote Sensing, Mailand, Italy, 2016. [DOI] [Bibtex]
    @inproceedings{donati2016,
    author = {Donati, Giovanni and Musolff, Christian and Gottardo, Giuseppe and Popp, Daniel and Fischer, Georg},
    language = {English},
    booktitle = {Fifth International Conference on Telecommunications and Remote Sensing},
    cris = {https://cris.fau.de/converis/publicweb/publication/203357639},
    year = {2016},
    month = {10},
    day = {10},
    doi = {10.5220/0006227100530060},
    eventdate = {2016-10-10/2016-10-11},
    faupublication = {yes},
    isbn = {9789897582004},
    peerreviewed = {Yes},
    title = {Physically inspired digital predistortion for doherty power ampliers and automatic in-situ identication},
    type = {Konferenzschrift},
    url = {http://www.ictrs.org/Documents/ProceedingsOfFifthICTRS.pdf},
    venue = {Mailand, Italy},
    }
  • G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends", Radio Science, vol. 51, iss. 8, pp. 1363-1376, 2016. [DOI] [Bibtex]
    @article{gottardo2016,
    abstract = {Duplex filters in modern base transceiver stations (BTS) provides the channel shape in order to perform common frequency division duplex (FDD) operation. Usually they are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. This solution provides the shaping of the signal spectrum directly at the output of the radio frequency (RF) power amplifiers (PAs) relaxing the transmitter design especially in the duplexer and the antenna sections. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. A model to describe the hybrid system is investigated and the relation between phase and resonance peaks in the resulting periodic band-pass transfer function is described. The stability condition of the system is analyzed using Nyquist criterion and defining a safe work region in order to avoid oscillation. A solution involving a number of digital feedback and forward branches is investigated defining recursive structure parameters of the hybrid filter. This last solution allows the closed loop system to show at the output of the RF amplifier a periodic band-pass with up to 500 KHz bandwidth. Moreover, the band-pass magnitude reaches up to 17 dB difference between maximum gain and attenuation.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    publisher = {AGU Journal - Wiley online Journal},
    cris = {https://cris.fau.de/converis/publicweb/publication/122839904},
    year = {2016},
    month = {08},
    doi = {10.1002/2016RS005969},
    faupublication = {yes},
    issn = {0048-6604},
    journaltitle = {Radio Science},
    keywords = {active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters},
    number = {8},
    pages = {1363--1376},
    peerreviewed = {Yes},
    title = {Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends},
    volume = {51},
    }

2015

  • G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends" in Mediterranean Microwave Symposium, Lecce, Italy, 2015, pp. 227-230. [DOI] [Bibtex]
    @inproceedings{gottardo2015a,
    abstract = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband feedback applied to the analog power RF amplifiers (hybrid filter) is presented and verified by measurements. The use of multiple digital feedback branches allows the closed loop system to show a periodic band-pass behavior at the output of the RF amplifier with a larger bandwidth up to 500 KHz. Moreover the band pass magnitude reaches up to 17 dB difference between maximum gain and attenuation.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    publisher = {IEEE},
    booktitle = {Mediterranean Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/108076364},
    year = {2015},
    month = {12},
    day = {30},
    doi = {10.1109/MMS.2015.7375476},
    eventdate = {2015-11-30/2015-12-02},
    faupublication = {yes},
    keywords = {active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {227--230},
    peerreviewed = {Yes},
    title = {Hybrid Recursive Active Filters for Duplexing in RF Transmitter Front-Ends},
    venue = {Lecce, Italy},
    }
  • G. Gottardo, G. Donati, C. Musolff, G. Fischer, and T. Felgentreff, "Hybrid Recursive Active Filters for High Selectivity in RF Transmitter Front-Ends" in 2nd International Scientific Symposium ”Sense. Enable. SPITSE.” 2015, St. Petersburg, Russia, 2015, pp. 15-18. [Bibtex]
    @inproceedings{gottardo2015,
    abstract = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. Thanks to the emerging digital technology and fast digital converters, it is possible to transfer the efforts of designing analog duplex filters into digital numeric algorithms applied to feedback structures, operating on power amplifiers in transmitters. The design of a digital baseband feedback applied to the analog power amplifiers is described making use of a model here verified by measurements. The design of hybrid filters allows the closed loop system to reach up to 20 dB difference between maximum gain and attenuation. Particular attention is dedicated to preserve stability conditions. The proposed architecture has the potential to reduce the cost and size of the RF front-ends.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Fischer, Georg and Felgentreff, Tilman},
    language = {English},
    publisher = {St. Petersburg Electrotechnical University "LETI" Symposium Proceedings - IEEE},
    booktitle = {2nd International Scientific Symposium ”Sense. Enable. SPITSE.” 2015},
    cris = {https://cris.fau.de/converis/publicweb/publication/108057444},
    year = {2015},
    month = {07},
    day = {22},
    eventdate = {2015-06-22/2015-07-03},
    eventtitle = {2nd International Scientific Symposium "Sense. Enable. SPITSE."},
    faupublication = {yes},
    keywords = {Active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {15--18},
    peerreviewed = {Yes},
    title = {Hybrid Recursive Active Filters for High Selectivity in RF Transmitter Front-Ends},
    type = {Konferenzschrift},
    url = {http://www.eltech.ru/ru/mezhdunarodnaya-deyatelnost/spitse},
    venue = {St. Petersburg, Russia},
    }
  • W. Akstaller, A. Tag, C. Musolff, R. Weigel, and A. Hagelauer, "Measurement Setup for X-Parameter Characterization of Bulk Acoustic Wave Resonators" in 85th Microwave Measurement Conference (ARFTG), Phoenix, AZ, USA, 2015, pp. 1-3. [DOI] [Bibtex]
    @inproceedings{akstaller2015,
    abstract = {In this work a modern measurement method has been utilized in order to characterize nonlinear behavior of bulk acoustic wave (BAW) solidly mounted resonators (SMR). Unlike typical nonlinearity characterization methods, the method which was employed here not only records amplitudes, but also the phase of generated harmonics. Furthermore, the relations between the harmonics of different order are given. The modeling approach being used is the poly harmonic distortion (PHD) modeling approach, realized by the measurement of X-Parameters. For that purpose it was necessary to extend a nonlinear vector network analyzer (NVNA) by external components in order to enable high power measurements. Afterwards, several optimization steps were required to perform phase calibration. This difficulty arose due to the high power incident tones and steep resonator impedance curves on the one hand and the limited power provided by the phase calibration standard on the other hand.},
    author = {Akstaller, Wolfgang and Tag, Andreas and Musolff, Christian and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {85th Microwave Measurement Conference (ARFTG)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108068004},
    year = {2015},
    month = {05},
    day = {22},
    doi = {10.1109/ARFTG.2015.7162919},
    eventdate = {2015-05-22/2015-05-22},
    faupublication = {yes},
    keywords = {X-Parameter; BAW},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Measurement Setup for X-Parameter Characterization of Bulk Acoustic Wave Resonators},
    venue = {Phoenix, AZ, USA},
    }
  • A. Tag, W. Akstaller, C. Musolff, B. Bader, M. Pitschi, R. Weigel, and A. Hagelauer, "Polyharmonic Distortion Modeling of RF BAW Components" in IEEE International Microwave Symposium, Phoenix, USA, 2015, pp. 1-3. [DOI] [Bibtex]
    @inproceedings{tag2015a,
    author = {Tag, Andreas and Akstaller, Wolfgang and Musolff, Christian and Bader, Bernhard and Pitschi, Maximilian and Weigel, Robert and Hagelauer, Amelie},
    publisher = {IEEE},
    booktitle = {IEEE International Microwave Symposium},
    cris = {https://cris.fau.de/converis/publicweb/publication/123888204},
    year = {2015},
    month = {05},
    day = {17},
    doi = {10.1109/MWSYM.2015.7166954},
    eventdate = {2015-05-17/2015-05-22},
    faupublication = {yes},
    pages = {1--3},
    peerreviewed = {Yes},
    title = {Polyharmonic Distortion Modeling of RF BAW Components},
    venue = {Phoenix, USA},
    }
  • C. Musolff, M. Kamper, and G. Fischer, "Linear Doherty PA at 5 GHz", IEEE Microwave Magazine, vol. 16, iss. 1, pp. 89-93, 2015. [DOI] [Bibtex]
    @article{musolff2015,
    author = {Musolff, Christian and Kamper, Michael and Fischer, Georg},
    publisher = {Institute of Electrical and Electronics Engineers Inc.},
    cris = {https://cris.fau.de/converis/publicweb/publication/202292904},
    year = {2015},
    doi = {10.1109/MMM.2014.2367862},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    number = {1},
    pages = {89--93},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Linear Doherty PA at 5 GHz},
    type = {Article in Journal},
    volume = {16},
    }

2014

  • G. Gottardo, G. Donati, C. Musolff, R. Weigel, and G. Fischer, "Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends" in German Microwave Conference, Aachen, Germany, 2014, pp. 1-4. [DOI] [Bibtex]
    @inproceedings{gottardo2014,
    abstract = {Duplex filters in modern base stations are designed as cavity filters, which are expensive and have big dimensions. In order to reduce the size of these filters a novel hybrid system using a power amplifier and a negative digital feedback for frequency band GSM900 is studied. A model to describe the hybrid system is investigated and the relation between phase and resonance peaks in the transfer function is described. An attenuation of 5.4 dB for the closed loop transfer function is reached. The stability condition of the system is here presented using Nyquist criterion as an important step for its future feasibility.},
    author = {Gottardo, Giuseppe and Donati, Giovanni and Musolff, Christian and Weigel, Robert and Fischer, Georg},
    publisher = {IEEE},
    booktitle = {German Microwave Conference},
    cris = {https://cris.fau.de/converis/publicweb/publication/119369184},
    year = {2014},
    month = {03},
    day = {10},
    doi = {10.1109/MMM.2013.2288713},
    eventdate = {2014-03-10/2014-03-12},
    faupublication = {yes},
    keywords = {Active filter; feedback amplifier; base station; stability analysis; interference suppression; band-pass filters; cavity resonators},
    pages = {1--4},
    peerreviewed = {Yes},
    title = {Novel Hybrid Recursive Active Filters in RF Transmitter Front-Ends},
    venue = {Aachen, Germany},
    }
  • C. Musolff, M. Kamper, Z. Abou-Chahine, and G. Fischer, "Linear and efficient Doherty PA Revisited", IEEE Microwave Magazine, vol. 15, iss. 1, pp. 73-79, 2014. [DOI] [Bibtex]
    @article{musolff2014,
    author = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/119987384},
    year = {2014},
    month = {02},
    doi = {10.1109/MMM.2013.2288713},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {power amplifier; doherty; linear; 3.5GHz; IMD; RFPA; PA; student design competition},
    number = {1},
    pages = {73--79},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {Linear and efficient Doherty PA Revisited},
    volume = {15},
    }

2013

  • C. Musolff, M. Kamper, Z. Abou-Chahine, and G. Fischer, "A linear and efficient Doherty PA at 3,5GHz", IEEE Microwave Magazine, vol. 14, iss. 1, pp. 95-101, 2013. [DOI] [Bibtex]
    @article{musolff2013,
    author = {Musolff, Christian and Kamper, Michael and Abou-Chahine, Zeid and Fischer, Georg},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/107982204},
    year = {2013},
    month = {02},
    doi = {10.1109/MMM.2012.2226998},
    faupublication = {yes},
    issn = {1527-3342},
    journaltitle = {IEEE Microwave Magazine},
    keywords = {power amplifier; Doherty; load modulation; linearity; IMD; cancellation; 3,5GHz; efficiency; backoff; twotone; harmonic balance},
    number = {1},
    pages = {95--101},
    peerreviewed = {Yes},
    shortjournal = {IEEE MICROW MAG},
    title = {A linear and efficient Doherty PA at 3,5GHz},
    volume = {14},
    }

2012

  • C. Musolff, "Aktuelle Ansaetze im Bereich der linearen HF Leisungsverstaerker" in Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse, Ulm, DE, 2012. [Bibtex]
    @inproceedings{musolff2012,
    author = {Musolff, Christian},
    booktitle = {Electrical and Electronic Engineering for Communication Workshop - Entwicklerforum - Fachmesse},
    cris = {https://cris.fau.de/converis/publicweb/publication/106900684},
    year = {2012},
    month = {05},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Aktuelle Ansaetze im Bereich der linearen HF Leisungsverstaerker},
    venue = {Ulm, DE},
    }

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.