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  • 1.
    Gong, Shaofang
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Truly Differential RF and Microwave Front-End Design2010In: IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON), Piscataway, NJ, USA: IEEE , 2010, p. 1-5Conference paper (Refereed)
    Abstract [en]

    New design methodology for truly differential RF and microwave front-ends has been presented in this paper. Baluns are avoided using this design methodology, while achieving differential signaling for high noise immunity. A case study on an ultra-wide band RF front-end in the frequency band 6-9 GHz has been performed using the new design methodology, indicating that both wide bandwidth and high performance can be achieved using this design methodology. A direct comparison between single-ended and differential designs of the RF filter has also been presented in order to verify the correctness of the design methodology.

  • 2.
    Gong, Shaofang
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Radio Architecture for Parallel Processing of Extremely High Speed Data2009In: IEEE International Conference on Ultra-Wideband, ICUWB, Vancouver, Canada, 9-11 Sept., IEEE , 2009, p. 433-437Conference paper (Refereed)
    Abstract [en]

    Using our own-developed frequency multiplexing network, a radio architecture for parallel radio signal processing has been proposed for achieving extremely high data rate above 10 Gbit/s. To meet the high requirement on phase linearity, amplitude balance and low noise figure in a very large bandwidth, our own-developed ultra-wideband six-port correlator has been utilized for the modulator and demodulator in the radio architecture.

  • 3.
    Karlsson, Magnus
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology, Physics and Electronics.
    Jobs, Magnus
    Uppsala University.
    Gruden, Mathias
    Uppsala University.
    Dipole Antenna With Integrated Balun For Ultra-wideband Radio 6-9 GHz2011In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 53, no 1, p. 180-184Article in journal (Refereed)
    Abstract [en]

    A fully integrated dipole antenna with a balun fot ulna wideband (UWB) radio in the band 6-9 GHz utilizing a flexible and rigid printed count board is presented in this at tide The balun utilizes broadside coupled microstrips and is integrated in the rigid part of the printed coma boat d whereas the radiator is placed in the flexible pat! The antenna with the balun covets the frequency band 6 0-8 5 GHz at voltage standing mate ratio (VSWR) andlt;2 0 and 55-110 GHz at VSWR andlt; 2 5 Moreover simulated and measured radiation patterns and antenna efficiency above 860% are observed

  • 4.
    Karlsson, Magnus
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Frequency Triplexer for Ultra-Wideband Systems (6–9 GHz)2013In: IEEE Transactions on Circuits and Systems Part 1: Regular Papers, ISSN 1549-8328, E-ISSN 1558-0806, Vol. 60, no 3, p. 540-547Article in journal (Refereed)
    Abstract [en]

    A triplexer for ultra-wideband radio implemented entirely with distributed microstrips is presented. The triplexer is composed of a triplex junction network and three bandpass filters. The circuit is integrated in a flex-rigid printed circuit board. Three flat 1 GHz sub-bands in the frequency band 6-9 GHz have been achieved. The group delay variation within each 1 GHz sub-band was measured to be less than 0.4 ns. A good agreement between simulation and measurement was obtained, e.g., less than 0.3 dB difference in the forward transmission in the majority of the frequency band.

  • 5.
    Mohsin, Imran
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Design and implementation of a UWB six-port correlator for 6-9 GHz frequency band2013In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 55, no 1, p. 190-193Article in journal (Refereed)
    Abstract [en]

    A compact size six-port correlator using bandwidth enhancing stubs for the 69 GHz ultra wideband radio is presented. The proposed six-port has a center frequency of 7.5 GHz with 50% relative bandwidth. The correlator is based entirely on microstrip technology for low cost and simple circuit implementation.

  • 6.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Six-port Radio Transceiver for Ultra-wideband and Wideband Antennas2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Requirement for high speed wireless connectivity is propelling research in advanced communication systems. Low power and wide bandwidth of the ultra-wideband technology makes it a potential candidate for high speed data transmission. The six-port based radio systems and wideband antennas have been studied and presented in this dissertation for ultra-wideband applications.

    The six-port modulator operation with carrier leakage suppression was demonstrated at a center frequency of 7.5 GHz. The six-port correlator utilizes a quarter wavelength transmission line for carrier leakage suppression, together with diodes or eld effect transistors as variable impedance terminations. Especially, a differential six-port modulator was designed and veried through simulation and measurement. The prototype shows its capability of carrier leakage suppression and high speed data transmission with 256-quadrature amplitude modulation at 50 Msymbol/s at the center frequency of 7.5 GHz. Furthermore, a differential six-port demodulator was demonstrated with the 16 quadrature amplitude modulation at a data rate of 0.8 Gbit/s at the center frequency of 7.5 GHz. It uses zero-bias anti-parallel Schottky diodes as power detectors.

    Flexible antennas were designed such that they can be housed by folding it around in space limited environment with stable performance over a wide operation bandwidth. Measurement, on a exible dipole antenna with integrated balun, shows that it covers a frequency band from 6 to 11 GHz at a voltage standing wave ratio lower than 2.5 with the antenna eciency above 86%. A miniaturized monopole antenna that is not only capable of operating over an ultra-wideband but also for lower frequency bands was invented and veried. It covers a frequency range from 1.35 to 11.5 GHz. It gives a quasi-omnidirectional radiation pattern and high eciency. The antenna has a patent pending status with the United States Patent and Trademark Oce.

    List of papers
    1. Differential Six-Port Demodulator
    Open this publication in new window or tab >>Differential Six-Port Demodulator
    Show others...
    2011 (English)In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 53, no 9, p. 2192-2197Article in journal (Refereed) Published
    Abstract [en]

    A differential six-port demodulator for the 7-8 GHz band is reported for the first time. It is composed of a differential six-port correlator on the two sides of the substrate and zero-bias antiparallel Schottky diodes acting as power detectors. It is theoretically analyzed and also simulated. A prototype has been fabricated and data transmission at 0.8 Gbit/s (but not the maximum) with the 16 quadrature amplitude modulation (QAM) is experimentally demonstrated.

    Place, publisher, year, edition, pages
    John Wiley and Sons, Ltd, 2011
    Keywords
    differential; six-port; direct conversion demodulator; antiparallel diode pair
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-69769 (URN)10.1002/mop.26191 (DOI)000292600900066 ()
    Available from: 2011-08-10 Created: 2011-08-08 Last updated: 2019-06-17Bibliographically approved
    2. Differential Six-Port Demodulator
    Open this publication in new window or tab >>Differential Six-Port Demodulator
    2011 (English)In: Proceedings on International Conference on Wireless Communications and Signal Processing, 2011Conference paper, Published paper (Other academic)
    Abstract [en]

    A differential six-port demodulator for the 7-8 GHz band is reported for the first time. It is composed of a differential six-port correlator on the two sides of the substrate and zero-bias antiparallel Schottky diodes acting as power detectors. It is theoretically analyzed and also simulated. A prototype has been fabricated and data transmission at 0.8 Gbit/s (but not the maximum) with the 16 quadrature amplitude modulation (QAM) is experimentally demonstrated.

    Keywords
    differential; six-port; direct conversion demodulator; antiparallel diode pair
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-71834 (URN)
    Conference
    International Conference on Wireless Communications and Signal Processing (WSPS2011), 9-11 November, Nanjing, China
    Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2011-11-07Bibliographically approved
    3. Differential Six-Port Transceiver
    Open this publication in new window or tab >>Differential Six-Port Transceiver
    Show others...
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    A differential six-port transceiver for the 7-8 GHz band is presented for the rst time. It is fabricated using double-sided parallel-strip lines. The transmitter is composed of a differential six-port correlator with a quarter wavelength arrangement for carrier suppression. Cold-mode field effect transistors are used as impedance terminations, controlled via baseband signals on the gate to source terminal. The receiver is comprised of a differential six-port correlator and diode detectors. The diodes on the front-side and the back-side are connected in antiparallel, resulting in a differential input and differential output six-port receiver. The main features of the transceiver are low complexity, low power consumption, and high data rate. Data transmission and reception with the transceiver is demonstrated with quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) with 100 and 200 M symbol / s , respectively.

    Keywords
    Dierential, six-port, six-port transmitter, six-port receiver, transceiver, carrier suppression
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-71835 (URN)
    Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2019-06-17Bibliographically approved
    4. Wideband Planar Antenna with Modified Ground Plane
    Open this publication in new window or tab >>Wideband Planar Antenna with Modified Ground Plane
    Show others...
    2010 (English)In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 52, no 11, p. 2581-2585Article in journal (Refereed) Published
    Abstract [en]

    In this article a miniaturized planar antenna is presented for broadband applications. Antenna miniaturization is achieved by modifying the ground plane that creates a different current path thus increasing the effective dimension of the antenna. In addition, dual chopping, slitting, and radiator position offsetting provide wideband behavior and relatively good impedance matching. The low profile antenna with its wide bandwidth, linear phase response and quasi-omnidirectional radiation pattern is attractive for the existing and future communication devices of small size. Simulated and measured results for the proposed antenna are presented and analyzed.

    Place, publisher, year, edition, pages
    John Wiley and Sons, Ltd, 2010
    Keywords
    planar antenna, miniaturization, wideband, ground plane extension, slit, offset radiator
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-66861 (URN)10.1002/mop.25519 (DOI)000281831500050 ()
    Available from: 2011-03-22 Created: 2011-03-21 Last updated: 2019-06-17Bibliographically approved
    5. Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage
    Open this publication in new window or tab >>Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage
    Show others...
    2011 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 59, no 3, p. 741-747Article in journal (Refereed) Published
    Abstract [en]

    This paper presents a direct carrier six-port modulator. To allow arbitrary load impedances to be used and for suppression of carrier leakage, a new circuit architecture with a technique to suppress carrier leakage is proposed and implemented. A theoretical model of the proposed modulator is derived. A prototype modulator utilizing diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz for verification of the proposed technique. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 100 Msymbol/s is generated, as well as good carrier leakage suppression.

    Place, publisher, year, edition, pages
    IEEE Institute of Electrical and Electronics, 2011
    Keywords
    Carrier leakage suppression, direct carrier modulator, six-port correlator
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-67308 (URN)10.1109/TMTT.2011.2104972 (DOI)000288460500026 ()
    Available from: 2011-04-08 Created: 2011-04-08 Last updated: 2019-06-17Bibliographically approved
    6. Six-port transceiver for 6-9 GHz ultrawideband systems
    Open this publication in new window or tab >>Six-port transceiver for 6-9 GHz ultrawideband systems
    Show others...
    2010 (English)In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 42, no 3, p. 740-746Article in journal (Refereed) Published
    Abstract [en]

    An ultrawideband 6-9 GHz six-port correlator is designed and manufactured.Based on this six-port correlator, behavioral models, and true component circuit designs of a transceiver are developed to study the performance of the proposed direct conversion ultrawideband transceiver topology. A new six-port modulator with controllable impedance terminations implemented with a field effect transistor in the linear operation region is presented

    Keywords
    Six-port transceiver, six-port transmitter, six-port receiver, UWB systems
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:liu:diva-53605 (URN)10.1002/mop.25021 (DOI)000274363700062 ()
    Note
    On the day of the defence day the status of this article was: Accepted.Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2019-06-17
    7. Dipole Antenna With Integrated Balun For Ultra-wideband Radio 6-9 GHz
    Open this publication in new window or tab >>Dipole Antenna With Integrated Balun For Ultra-wideband Radio 6-9 GHz
    Show others...
    2011 (English)In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 53, no 1, p. 180-184Article in journal (Refereed) Published
    Abstract [en]

    A fully integrated dipole antenna with a balun fot ulna wideband (UWB) radio in the band 6-9 GHz utilizing a flexible and rigid printed count board is presented in this at tide The balun utilizes broadside coupled microstrips and is integrated in the rigid part of the printed coma boat d whereas the radiator is placed in the flexible pat! The antenna with the balun covets the frequency band 6 0-8 5 GHz at voltage standing mate ratio (VSWR) andlt;2 0 and 55-110 GHz at VSWR andlt; 2 5 Moreover simulated and measured radiation patterns and antenna efficiency above 860% are observed

    Place, publisher, year, edition, pages
    John Wiley & Sons, 2011
    Keywords
    balun, broadside, coupled, dipole antenna, ultra wideband
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-64238 (URN)10.1002/mop.25656 (DOI)000285231200050 ()
    Available from: 2011-01-17 Created: 2011-01-17 Last updated: 2019-08-12Bibliographically approved
  • 7.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.
    Circular Monopole Antenna Stability with Regard to Ground Plane Size2008In: Proc. of the 2008 International Symposium on Antenna and Propagation (ISAP'08), Taiwan, Oct. 27-30, 2008., 2008, p. 1-4, article id 1645003Conference paper (Refereed)
    Abstract [en]

    Wireless communications for short range and high data rate require wideband operation that necessitates the demand for miniaturized, low cost and low profile antennas. Miniaturized planar monopole antennas provide wide impedance bandwidth for wireless personal area network applications [1]. Different monopole shapes have been considered and a lot of research has been made to improve the bandwidth and reduce the size by changing the antenna shape [2]-[4]. The radiator part has been the main focus of research to find a shape that provides wide bandwidth [3]-[4], as well on studying how the ground plane affects the bandwidth of antennas. Wide bandwidth has been obtained by bevelling the radiator [5] and use of a modified ground plane [6]. Planar monopoles with parasitic elements and slots give also a wideband [7]. It has been documented that the finite size of the ground plane is an important factor for the antenna performance [8]. Planar monopoles have a benefit of being low cost and compatible to printed circuit board (PCB) allowing compact design. Since the ground plane is coplanar with the antenna, it necessitates that its stability should not change when integrated in PCB with different ground plane size of adjoining circuits. To avoid pre-tuning and achieve cost effectiveness, system development requires a stable planar monopole antenna that can be integrated without depreciation of its performance. This paper studies in detail the effect of ground plane dimension, width and length, on the stability of the coplanar monopole antenna, by changing the ground plane size while keeping feedline and feedap constant. The parametric investigation supported by simulation and experimental results is conducted in this paper to give insights to the stability issue that have not been reported before.

  • 8.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ying, Zhinong
    Sony Ericsson Mobile Commun AB.
    Gruden, Mathias
    Sony Ericsson Mobile Commun AB.
    Job, Magnus
    Uppsala University.
    Wideband Planar Antenna with Modified Ground Plane2010In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 52, no 11, p. 2581-2585Article in journal (Refereed)
    Abstract [en]

    In this article a miniaturized planar antenna is presented for broadband applications. Antenna miniaturization is achieved by modifying the ground plane that creates a different current path thus increasing the effective dimension of the antenna. In addition, dual chopping, slitting, and radiator position offsetting provide wideband behavior and relatively good impedance matching. The low profile antenna with its wide bandwidth, linear phase response and quasi-omnidirectional radiation pattern is attractive for the existing and future communication devices of small size. Simulated and measured results for the proposed antenna are presented and analyzed.

  • 9.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Six-Port Demodulator2011In: Proceedings on International Conference on Wireless Communications and Signal Processing, 2011Conference paper (Other academic)
    Abstract [en]

    A differential six-port demodulator for the 7-8 GHz band is reported for the first time. It is composed of a differential six-port correlator on the two sides of the substrate and zero-bias antiparallel Schottky diodes acting as power detectors. It is theoretically analyzed and also simulated. A prototype has been fabricated and data transmission at 0.8 Gbit/s (but not the maximum) with the 16 quadrature amplitude modulation (QAM) is experimentally demonstrated.

  • 10.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Six-Port Demodulator2011In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 53, no 9, p. 2192-2197Article in journal (Refereed)
    Abstract [en]

    A differential six-port demodulator for the 7-8 GHz band is reported for the first time. It is composed of a differential six-port correlator on the two sides of the substrate and zero-bias antiparallel Schottky diodes acting as power detectors. It is theoretically analyzed and also simulated. A prototype has been fabricated and data transmission at 0.8 Gbit/s (but not the maximum) with the 16 quadrature amplitude modulation (QAM) is experimentally demonstrated.

  • 11.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Six-Port TransceiverManuscript (preprint) (Other academic)
    Abstract [en]

    A differential six-port transceiver for the 7-8 GHz band is presented for the rst time. It is fabricated using double-sided parallel-strip lines. The transmitter is composed of a differential six-port correlator with a quarter wavelength arrangement for carrier suppression. Cold-mode field effect transistors are used as impedance terminations, controlled via baseband signals on the gate to source terminal. The receiver is comprised of a differential six-port correlator and diode detectors. The diodes on the front-side and the back-side are connected in antiparallel, resulting in a differential input and differential output six-port receiver. The main features of the transceiver are low complexity, low power consumption, and high data rate. Data transmission and reception with the transceiver is demonstrated with quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) with 100 and 200 M symbol / s , respectively.

  • 12.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Six-Port Direct Carrier Modulator at 7.5 GHz2010In: Proceedings of GigaHertz 2010, 2010Conference paper (Refereed)
  • 13.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Six-Port Direct Carrier Modulator at 7.5 GHz for Ultra-Wideband  AppliationsManuscript (preprint) (Other academic)
    Abstract [en]

    A 7.5 GHz direct-carrier modulator for multi-level quadrature amplitude modulation (M-QAM) using a wideband 7-8 GHz six-port correlator and four controllable impedance terminations implemented with field-effect transistors (FET) is presented in this paper. The proposed encoding schemes of the reflection-type modulator is based on equal impedance values at I and Q ports, such that Γ3 = Γ4 and Γ5 = Γ6 for every symbol in the constellation diagram. The field-effect transistors are operated at zero drain-source voltage (cold-FET). The FET-impedance termination topology includes a source resistor (RS) and a gate resistor (RG) for symmetrical spreading of the reflection coefficients around the origin. In order to validate the 7.5 GHz six-port modulator with cold-FET impedance terminations, the six-port modulator prototype has been realized on a ROGERS4350B substrate of 0.254-mm thickness and tested with a six-port demodulator (receiver). The six-port modulator was measure to have symbol rates of 10 Msymbol/s with QPSK (= 20 Mbit/s) and 250 Msymbol/s with 16-QAM (= 1 Gbit/s).

  • 14.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Six-port transceiver for 6-9 GHz ultrawideband systems2010In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 42, no 3, p. 740-746Article in journal (Refereed)
    Abstract [en]

    An ultrawideband 6-9 GHz six-port correlator is designed and manufactured.Based on this six-port correlator, behavioral models, and true component circuit designs of a transceiver are developed to study the performance of the proposed direct conversion ultrawideband transceiver topology. A new six-port modulator with controllable impedance terminations implemented with a field effect transistor in the linear operation region is presented

  • 15.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Baseband complexity comparison of six-, five-, and four-port receivers2012In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 54, no 6, p. 1502-1506Article in journal (Refereed)
    Abstract [en]

    The use of six-port correlators to implement six-port receivers has been intensively studied. The six-port receiver can also be modified to a five-port or a four-port receiver. However, the six-, five-, or four-port receiver solution requires different baseband processing to recover the baseband In-phase (I) and Quadrature-phase (Q) data. A unified mathematical model for the six-, five- and four-port receivers is presented in this article. Possible solutions to recover the baseband data are discussed and compared. The investigation shows that the six-port receiver has advantages over the five- and four-port receivers in terms of complexity when analog baseband processing is used. Simulations are conducted to verify the model and to estimate the error vector magnitude versus frequency; the simulation also shows that the six-port receiver operates over a wider bandwidth than the five- or four-port receiver.

  • 16.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Performance Evaluation of Six-Port Receivers with Simplified Interface to Amplifier and Filter2011Conference paper (Refereed)
    Abstract [en]

    In six-port modulators a phase shifting network on specific ports can be used to suppress the carrier leakage that may be present if this network is not present. A model is derived to predict the carrier leakage suppression and error vector magnitude (EVM) as a function of the phase shifting network Sparameters. Both carrier leakage suppression and EVM can be expressed by the same error function. The error function can be used to find the allowed amplitude and phase mismatch in the phase shifting network, or to optimize the performance of a phase shifting network over a given frequency range. A broadband phase shifting network, based on a loaded transmission line, is designed and optimized to operate at a relative bandwidth of 60% for an EVM < 10%. This should be compared to a phase shifting network based on a single transmission line with a corresponding bandwidth of only 12%. The broadband phase shifting network is useful for six-port modulators with carrier leakage suppression, targeting UWB applications.

  • 17.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Schottky diode as high-speed variable impedance load in six-port modulators2011In: ICUWB 2011: 2011 IEEE International Conference on Ultra-Wideband (ICUWB), 2011, p. 68-71Conference paper (Refereed)
    Abstract [en]

    The use of Schottky diodes as high-speed variable impedance loads in six-port modulators are proposed and analyzed in this paper. The impedance dependency of diode parameters and local oscillator power are investigated by theoretical analysis and simulations. A prototype for a direct carrier six-port modulator using Schottky diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 300 Msymbol/s is generated, i.e., at a data rate of 1.2 Gbit/s, validating the use of Schottky diodes as high-speed variable impedance loads in six-port modulators.

  • 18.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Peter
    Sony Ericsson Mobile Communication AB.
    Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage2011In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 59, no 3, p. 741-747Article in journal (Refereed)
    Abstract [en]

    This paper presents a direct carrier six-port modulator. To allow arbitrary load impedances to be used and for suppression of carrier leakage, a new circuit architecture with a technique to suppress carrier leakage is proposed and implemented. A theoretical model of the proposed modulator is derived. A prototype modulator utilizing diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz for verification of the proposed technique. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 100 Msymbol/s is generated, as well as good carrier leakage suppression.

  • 19.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Data and Carrier Interleaving in Six-Port Receivers for Increased Data Rate2010In: 2010 IEEE International Conferenceon Ultra-Wideband (ICUWB2010: Proceedings - Volume 1, 2010, p. 1-4Conference paper (Refereed)
    Abstract [en]

    This paper proposes how antenna polarization can be utilized to increase the maximum data rate in a multiple six-port receiver system. By utilizing data and carrier interleaving, the total information bandwidth increases and therefore the maximum data rate. Prototype antennas were manufactured and the measured results were later used in a simulation model with three channels for verification of the concept.

  • 20.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Diode Configurations in Six-Port Receivers with Simplified Interface to Amplifier and Filter2010In: 2010 IEEE International Conferenceon Ultra-Wideband (ICUWB2010): Proceedings – Volume 1, Piscataway, NJ, USA: IEEE , 2010, p. 1-4Conference paper (Refereed)
    Abstract [en]

    This paper presents two new diode configurations for use with six-port based demodulators. The first proposed diode configuration allows a simplified diode to filter/amplifier interface. The second configuration allows for full-wave rectification and suppression of odd-order harmonics. A demodulator prototype utilizing the new diode concept is designed for a center frequency of 7.5 GHz and with a bandwidth of 1 GHz for verification. The demodulator includes the six-port correlator, diodes and amplifiers needed to recover the baseband data.

  • 21.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Commun AB.
    Karlsson, Peter
    Sony Ericsson Mobile Commun AB.
    Six-Port Gigabit Demodulator2011In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 59, no 1, p. 125-131Article in journal (Refereed)
    Abstract [en]

    This paper presents measurement results for a six-port-based demodulator designed for a center frequency of 7.5 GHz and with a bandwidth of 1 GHz for operation in the ultra-wideband band. The demodulator includes the six-port correlator, diodes, and amplifiers needed to recover the baseband data. Measurement results show that the prototype supports data rates at 1.7 Gbit/s with bit-error rate 5 . 10(-5) if a two-tap linear equalizer is used and bit-error rate 4 . 10(-3) if only threshold detection is used. The measured performance of the used six-port correlator including the amplifiers is presented and their influence on the overall system performance is discussed. Limitations in the present system and possible improvements are also considered.

1 - 21 of 21
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