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  • 1. Andersson, M
    et al.
    Goransson, B
    Skarin, Ingvar
    From, K
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    Manholm, L
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Antennas with fast beam steering for high spectral efficiency in broadband cellular systems2006Conference paper (Refereed)
  • 2. Bartnitzek, T
    et al.
    Schönlinner, B
    Gautier, W
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Purtova, T
    Vähä-Veikkilä, T
    Ziaei, A
    Ceramic systems in package for RF and microwave2008In: IMAPS Advanced Technology Workshop on RF and Microwave Packaging, 2008Conference paper (Refereed)
  • 3.
    Brenner, Richard
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Multigigabit wireless transfer of trigger data through millimetre wave technology2010In: Journal of Instrumentation, E-ISSN 1748-0221, Vol. 5, p. C07002-Article in journal (Refereed)
    Abstract [en]

    The amount of data that can be transferred from highly granular tracking detectors with several million channels is today limited by the available bandwidth in the readout links which again is limited by power budget, mass and the available space for services. The low bandwidth prevents the tracker from being fully read out in real time which is a requirement for becomming a part of the first level trigger. To get the tracker to contribute to the fast trigger decision the data transfer bandwidth from the tracker has either to be increased for all data to be read out in real time or the quantity of the data to be reduced by improving the quality of the data or a combination of the two. A higher data transfer rate can be achieved by increasing the the number of data links, the data transfer speed or a combination of both. The quantity of data read out from the detector can be reduced by introducing on-detector intelligence. Next generation multigigabit wireless technology has several features that makes the technology attractive for use in future trackers. The technology can provide both higher bandwidth for data readout and means to build on-detector intelligence to improve the quality of data. The emerging millimetre wave technology offers components that are small size, low power and mass thus well suited for integration in trackers. In this paper the feasibility of wireless transfer of trigger data using 60GHz radio in the future upgraded tracker at the Super Large Hadron Collider (SLHC) is investigated.

  • 4.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Compact integrated slot array antennas for the 79 GHz automotive band2009Conference paper (Refereed)
  • 5.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Integrated Antenna Solutions for Wireless Sensor and Millimeter-Wave Systems2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis presents various integrated antenna solutions for different types of systems and applications, e.g. wireless sensors, broadband handsets, advanced base stations, MEMS-based reconfigurable front-ends, automotive anti-collision radars, and large area electronics.

    For wireless sensor applications, a T-matched dipole is proposed and integrated in an electrically small body-worn sensor node. Measurement techniques are developed to characterize the port impedance and radiation properties. Possibilities and limitations of the planar inverted cone antenna (PICA) for small handsets are studied experimentally. Printed slot-type and folded PICAs are demonstrated for UWB handheld terminals.

    Both monolithic and hybrid integration are applied for electrically steerable array antennas. Compact phase shifters within a traveling wave array antenna architecture, on single layer substrate, is investigated for the first time. Radio frequency MEMS switches are utilized to improve the performance of reconfigurable antennas at higher frequencies. Using monolithic integration, a 20 GHz switched beam antenna based on MEMS switches is implemented and evaluated. Compared to similar work published previously, complete experimental results are here for the first time reported. Moreover, a hybrid approach is used for a 24 GHz switched beam traveling wave array antenna. A MEMS router is fabricated on silicon substrate for switching two array antennas on a LTCC chip.

    A concept of nano-wire based substrate integrated waveguides (SIW) is proposed for millimeter-wave applications. Antenna prototypes based on this concept are successfully demonstrated for automotive radar applications.

    W-band body-worn nonlinear harmonic radar reflectors are proposed as a means to improve automotive radar functionality. Passive, semi-passive and active nonlinear reflectors consisting of array antennas and nonlinear circuitry on flex foils are investigated.

    A new stretchable RF electronics concept for large area electronics is demonstrated. It incorporates liquid metal into microstructured elastic channels. The prototypes exhibit high stretchability, foldability, and twistability, with maintained electrical properties.

    List of papers
    1. Compact Reflective Microstrip Phase Shifter for Traveling Wave Antenna Applications
    Open this publication in new window or tab >>Compact Reflective Microstrip Phase Shifter for Traveling Wave Antenna Applications
    2006 (English)In: IEEE Microwave and Wireless Components Letters, ISSN 1531-1309, E-ISSN 1558-1764, Vol. 16, no 7, p. 431-433Article in journal (Refereed) Published
    Abstract [en]

    A varactor diode based microstrip phase shifter for 5.8 GHz is presented. It is designed for use in microstrip traveling Wave antennas where there is a strict limitation on the available space for the phase shifters. To meet all requirements, a reflective type phase shifter is chosen. Such a phase shifter includes a hybrid coupler. A compact branch line coupler is designed to make the phase shifter fit between the radiating elements in the antenna, while maintaining sufficient electrical performance. Phase shifters are designed with different types of stubs connecting the diodes to ground. A phase tuning range of 621 is measured for a phase shifter with parallel open stubs, and 92 degrees with shorted stubs. Insertion loss is in both cases less than 0.6 dB. A complete five-element array antenna is built and characterized. Measurements show beam scanning angles within 32 degrees from broadside.

    Keywords
    branch line coupler; hybrid; reflective type phase shifter (RTPS); traveling wave antenna; varactor
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-94863 (URN)10.1109/LMWC.2006.877126 (DOI)000238865400015 ()
    External cooperation:
    Available from: 2006-09-22 Created: 2006-09-22 Last updated: 2017-12-14Bibliographically approved
    2. Electrically-steerable single-layer microstrip traveling wave antenna with varactor diode based phase shifters
    Open this publication in new window or tab >>Electrically-steerable single-layer microstrip traveling wave antenna with varactor diode based phase shifters
    Show others...
    2007 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 55, no 9, p. 2451-2460Article in journal (Refereed) Published
    Abstract [en]

    The design of electrically steerable traveling wave microstrip antenna arrays is presented. Varactor diode based phase shifters implemented on the same metallic layer as the patch elements are used to provide a variable progressive phase shift in the array. Two antennas for the 5.8 GHz ISM band, manufactured as single layer printed designs on a standard PTFE soft substrate, are demonstrated. A ten-element beam-tilting vertical array using transmission type phase shifters is realized, yielding between 11.8 to 13.9 dBi gain for the 0deg to 11deg beam tilt tuning range. Using wide phase tuning range reflection type phase shifters a five-element horizontally scanning array with -32deg to 32deg steering range and 10.9-11.3 dBi gain has been realized.

    Keywords
    Microstrip antennas, microwave phase shifters, phased arrays, traveling wave antennas
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-13375 (URN)10.1109/TAP.2007.904104 (DOI)000249213900004 ()
    Available from: 2008-01-22 Created: 2008-01-22 Last updated: 2017-12-11Bibliographically approved
    3. Modified planar inverted code antenna for mobile communication handsets
    Open this publication in new window or tab >>Modified planar inverted code antenna for mobile communication handsets
    2007 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 6, p. 472-475Article in journal (Refereed) Published
    Abstract [en]

    The planar inverted cone antenna (PICA) is an antenna type that shows remarkably wideband performance. In its basic configuration, it is mounted on an infinite ground plane, and protrudes lambda/4 above it. This letter presents a study of the possibilities of integrating a PICA in a mobile terminal handset by modifying the ground plane and the radiating element. Port impedance and radiation performance are studied in both simulations and measurement.

    Keywords
    Antennas, Monopole antennas, telephone sets
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-13374 (URN)10.1109/LAWP.2007.907051 (DOI)000252622000126 ()
    Available from: 2008-01-22 Created: 2008-01-22 Last updated: 2017-12-11Bibliographically approved
    4. Printed slot planar inverted cone antenna for ultrawideband applications
    Open this publication in new window or tab >>Printed slot planar inverted cone antenna for ultrawideband applications
    2008 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 7, p. 18-21Article in journal (Refereed) Published
    Abstract [en]

    A novel ultrawideband (UWB) printed wide-slot antenna is presented. The design is based on the planar inverted cone antenna (PICA), introduced by Suh. The presented design comprises PICA-like structures, etched from a double-layer substrate. Compared to the original PICA, it is lower in profile, more compact and maintains comparable performance. A prototype integrated in a printed circuit board and fed by a microstrip line is fabricated and measured. The results show that the proposed antenna provides at least 13:1 impedance bandwidth at 10-dB return loss.

    Keywords
    microstrip line, planar inverted cone antenna (PICA), printed circuit board (PCB), slot antenna, ultrawideband (UWB) antenna
    National Category
    Engineering and Technology
    Research subject
    Signal Processing
    Identifiers
    urn:nbn:se:uu:diva-109127 (URN)10.1109/LAWP.2007.914115 (DOI)000258586000005 ()
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13Bibliographically approved
    5. Substrate Integrated Waveguides (SIW) in a Flexible Printed Circuit Board for Millimeter Wave Applications
    Open this publication in new window or tab >>Substrate Integrated Waveguides (SIW) in a Flexible Printed Circuit Board for Millimeter Wave Applications
    2009 (English)In: Journal of microelectromechanical systems, ISSN 1057-7157, E-ISSN 1941-0158, Vol. 18, no 1, p. 154-162Article in journal (Refereed) Published
    Abstract [en]

    Substrate integrated waveguides (SIWs) are presented and demonstrated in a flexible printed circuit board (flex PCB) for application in the 77-81 GHz range. The vertical walls of the SIWs presented in this paper consist of multiple electrodeposited metallic wires. The diameters of these wires and the spacing between them are on the order of hundreds of nanometers. Hence, the walls can be seen as continuous metallic walls, and the leakage losses through them become negligible. In turn, the SIWs presented in this paper can operate at higher frequencies compared with previously presented structures that are realized with PCB fabrication processes. The attenuation of the SIWs is comparable to that of microstrip lines on the same sample. The SIWs are successfully demonstrated in a SIW-based slot antenna. The antenna gain along the z-axis (normal-to-plane) was found to be around 2.8 dBi at 78 GHz which is in agreement with the simulated values. [2008-0047]

    Keywords
    Flexible printed circuit boards (flex PCB), millimeter-wave (mm-W) antennas, millimeter waves, polyimide foils, substrate integrated waveguides (SIWs)
    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-96879 (URN)10.1109/JMEMS.2008.2009799 (DOI)000263123100016 ()
    Available from: 2008-03-19 Created: 2008-03-19 Last updated: 2017-12-14Bibliographically approved
    6. 79 GHz Slot Antennas Based on Substrate Integrated Waveguides (SIW) in a Flexible Printed Circuit Board
    Open this publication in new window or tab >>79 GHz Slot Antennas Based on Substrate Integrated Waveguides (SIW) in a Flexible Printed Circuit Board
    2009 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, no 1, p. 64-71Article in journal (Refereed) Published
    Abstract [en]

    The design, fabrication and characterization of 79 GHz slot antennas based on substrate integrated waveguides (SIW) are presented in this paper. All the prototypes are fabricated in a polyimide flex foil using printed circuit board (PCB) fabrication processes. A novel concept is used to minimize the leakage losses of the SlWs at millimeter wave frequencies. Different losses in the SlWs are analyzed. SIW-based single slot antenna, longitudinal and four-by-four slot array antennas are numerically and experimentally studied. Measurements of the   antennas show approximately 4.7%, 5.4% and 10.7% impedance bandwidth (S-11 = -10 dB) with 2.8 dBi, 6.0 dBi and 11.0 dBi maximum antenna gain around 79 GHz, respectively. The measured results are in good agreement with the numerical simulations.

    Keywords
    Flexible printed circuit boards, microstrip-to-SIW transition, millimeter wave, slot array antenna, substrate integrated waveguides (SIW)
    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-96880 (URN)10.1109/TAP.2008.2009708 (DOI)000264246700008 ()
    Available from: 2008-03-19 Created: 2008-03-19 Last updated: 2017-12-14Bibliographically approved
    7. T-matched dipole antenna integrated in electrically small body-worn wireless sensor node
    Open this publication in new window or tab >>T-matched dipole antenna integrated in electrically small body-worn wireless sensor node
    Show others...
    2009 (English)In: IEE Proceedings - Microwaves Antennas and Propagation, ISSN 1350-2417, E-ISSN 1359-706X, Vol. 3, no 5, p. 774-781Article in journal (Refereed) Published
    Abstract [en]

    A 2.4 GHz antenna for an electrically small body-worn sensor node is   presented. Usually, unbalanced antennas are used in such applications. Implementing a balanced antenna in a small node deployed on the body is problematic from the points of view of both design and   characterisation. A solution using a T-matched dipole integrated in the   node housing is presented. Techniques for characterisation both in free space and on the body are described. Besides antenna port impedance and radiation efficiency, radiated power and radiation patterns of the active antenna fed by a transceiver in a fully functional sensor node are measured. The benefits and drawbacks of the chosen antenna design and characterisation techniques are discussed.

    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-111198 (URN)10.1049/iet-map.2008.0218 (DOI)000268003900008 ()
    Projects
    WISENETECUBES
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2017-12-12
    8. Liquid metal stretchable unbalanced loop antenna
    Open this publication in new window or tab >>Liquid metal stretchable unbalanced loop antenna
    2009 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 14, p. 144103-Article in journal (Refereed) Published
    Abstract [en]

    We present a 2.4 GHz unbalanced loop antenna that can be stretched along multiple dimensions simultaneously. It was realized by incorporating room temperature liquid metal alloy into microstructured channels in an elastic material. The demonstrated prototype exhibits a stretchability of up to 40% along two orthogonal orientations as well as foldability and twistability. Port impedance and radiation characteristics of the nonstretched and stretched antenna were studied numerically and experimentally. Measured results indicate a radiation efficiency of more than 80%.

    Keywords
    liquid metals, loop antennas, radiation effects, UHF antennas
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-111190 (URN)10.1063/1.3114381 (DOI)000265083700076 ()
    Projects
    WISENET
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2017-12-12Bibliographically approved
    9. Switched beam antenna based on RF MEMS SPDT switch on quartz substrate
    Open this publication in new window or tab >>Switched beam antenna based on RF MEMS SPDT switch on quartz substrate
    Show others...
    2009 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 8, p. 383-386Article in journal (Refereed) Published
    Abstract [en]

    This letter demonstrates a 20-GHz radio frequency  microelectromechanical system (RF MEMS)-based electrically switchable   antenna on a quartz substrate. Two quasi-Yagi antenna elements are   monolithically integrated with a single-pole double-throw (SPDT) MEMS   switch router network on a 21 mm x 8 mm chip. Electrical beam steering   between two opposite directions is achieved using capacitive MEMS SPDT  switches in the router. Port impedance and radiation patterns are studied numerically and experimentally. Measured results show that the   switched beam antenna features a 27% impedance bandwidth (S-11 = -10   dB), a gain of 4.6 dBi, and a front-to-back ratio of 14 dB at 20 GHz   when the control voltage is applied to one of the switch pairs of the SPDT switch.

    Keywords
    Front-to-back ratio, half-power beamwidth (HPBW), quasi-Yagi antenna, radio frequency microelectromechanical system (RF MEMS), single-pole double-throw (SPDT) switch
    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-111192 (URN)10.1109/LAWP.2009.2018712 (DOI)000267792700020 ()
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2017-12-12Bibliographically approved
    10. Foldable and stretchable liquid metal planar inverted cone antenna
    Open this publication in new window or tab >>Foldable and stretchable liquid metal planar inverted cone antenna
    Show others...
    2009 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, no 12, p. 3765-3771Article in journal (Refereed) Published
    Abstract [en]

    A mechanically flexible planar inverted cone antenna (PICA) for   ultrawideband (UWB) applications is presented. It can be both folded   and stretched significantly without permanent damage or loss of   electrical functionality. The antenna is manufactured with a process in   which conductors are realized by injecting room temperature liquid   metal alloy into micro-structured channels in an elastic dielectric   material. The elastic dielectric material together with the liquid   metal enables bending with a very small radius, twisting, and   stretching along any direction. Port impedance and radiation   characteristics of the non-stretched and stretched antenna are studied   in simulations and experiments. The presented antenna has a return loss   better than 10 dB within 3-11 GHz and a radiation efficiency of > 70%   over 3-10 GHz, also when stretched. Tests verify that stretching up to   40% is possible with maintained electrical performance. The presented   antenna is useful for example for body-worn antennas and in   applications in harsh environments where mechanical flexibility helps   improve durability.

    Keywords
    Liquid alloy, planar inverted cone antenna (PICA), polydimethylsiloxane (PDMS), stretchable electronics, ultrawideband (UWB)
    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-111193 (URN)10.1109/TAP.2009.2024560 (DOI)000272313500013 ()
    Projects
    wisenet
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2017-12-12Bibliographically approved
    11. Millimeter-wave tapered slot antenna for integration on micromachined low resistivity silicon substrates
    Open this publication in new window or tab >>Millimeter-wave tapered slot antenna for integration on micromachined low resistivity silicon substrates
    Show others...
    2009 (English)In: IEEE International Workshop on Antenna Technology, iWAT 2009: Small and Smart Antennas Metamaterials and Applications, 2009, p. 1-4Conference paper, Published paper (Refereed)
    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-111194 (URN)10.1109/IWAT.2009.4906949 (DOI)978-1-4244-4395-6 (ISBN)
    Conference
    IEEE International Workshop on Antenna Technology
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2016-04-14Bibliographically approved
    12. Array antenna for body-worn automotive harmonic radar tag
    Open this publication in new window or tab >>Array antenna for body-worn automotive harmonic radar tag
    2009 (English)Conference paper, Published paper (Refereed)
    National Category
    Signal Processing
    Research subject
    Engineering Science with specialization in Microwave Technology
    Identifiers
    urn:nbn:se:uu:diva-111195 (URN)
    Conference
    The 3rd European Conference on Antennas and Propagation (EuCAP)
    Projects
    WISENET
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2016-04-14
    13. Compact integrated slot array antennas for the 79 GHz automotive band
    Open this publication in new window or tab >>Compact integrated slot array antennas for the 79 GHz automotive band
    2009 (English)Conference paper, Published paper (Refereed)
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-111196 (URN)
    Conference
    The 39th European Microwave Conference
    Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2016-04-14Bibliographically approved
    Download full text (pdf)
    FULLTEXT01
  • 6.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Johnson, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Reduction of the coupling to external sources and modes of propagation by a nearly confocal resonator2007In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 55, no 10, p. 2257-2261Article in journal (Refereed)
    Abstract [en]

    This paper presents a numerical and experimental study of a nearly confocal resonator with spherical mirrors at 12 GHz. The geometry was chosen in order to have a large quality factor for the diffraction losses, and thereby a weak coupling to external parasitic TE and TM modes, that propagate in a pipe on which the resonator may be installed. In turn, this allows a significant improvement of its signal-to-noise ratio, e.g., when used as a beam monitor.

  • 7.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    Analysis of a nearly-confocal resonator for parasitic external modes rejection2007Conference paper (Refereed)
  • 8.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Hallbjoerner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Printed slot planar inverted cone antenna for ultrawideband applications2008In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 7, p. 18-21Article in journal (Refereed)
    Abstract [en]

    A novel ultrawideband (UWB) printed wide-slot antenna is presented. The design is based on the planar inverted cone antenna (PICA), introduced by Suh. The presented design comprises PICA-like structures, etched from a double-layer substrate. Compared to the original PICA, it is lower in profile, more compact and maintains comparable performance. A prototype integrated in a printed circuit board and fed by a microstrip line is fabricated and measured. The results show that the proposed antenna provides at least 13:1 impedance bandwidth at 10-dB return loss.

  • 9.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Array antenna for body-worn automotive harmonic radar tag2009Conference paper (Refereed)
  • 10.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Vanotterdijk, D
    van Engen, P
    T-matched dipole antenna integrated in electrically small body-worn wireless sensor node2009In: IEE Proceedings - Microwaves Antennas and Propagation, ISSN 1350-2417, E-ISSN 1359-706X, Vol. 3, no 5, p. 774-781Article in journal (Refereed)
    Abstract [en]

    A 2.4 GHz antenna for an electrically small body-worn sensor node is   presented. Usually, unbalanced antennas are used in such applications. Implementing a balanced antenna in a small node deployed on the body is problematic from the points of view of both design and   characterisation. A solution using a T-matched dipole integrated in the   node housing is presented. Techniques for characterisation both in free space and on the body are described. Besides antenna port impedance and radiation efficiency, radiated power and radiation patterns of the active antenna fed by a transceiver in a fully functional sensor node are measured. The benefits and drawbacks of the chosen antenna design and characterisation techniques are discussed.

  • 11.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Vanotterdijk, Dennis
    Philips Applied Technologies, Eindhoven, The Netherlands.
    van Engen, Piet
    Philips Applied Technologies, Eindhoven, The Netherlands.
    Design and characterization methods for a balanced antenna integrated in a small sensor node2009In: Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK, 2009Conference paper (Refereed)
  • 12.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rantakari, P
    Malmqvist, Robert
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Samuelsson, C
    Vähä-Heikkilä, T
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Varis, J
    Switched beam antenna based on RF MEMS SPDT switch on quartz substrate2009In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 8, p. 383-386Article in journal (Refereed)
    Abstract [en]

    This letter demonstrates a 20-GHz radio frequency  microelectromechanical system (RF MEMS)-based electrically switchable   antenna on a quartz substrate. Two quasi-Yagi antenna elements are   monolithically integrated with a single-pole double-throw (SPDT) MEMS   switch router network on a 21 mm x 8 mm chip. Electrical beam steering   between two opposite directions is achieved using capacitive MEMS SPDT  switches in the router. Port impedance and radiation patterns are studied numerically and experimentally. Measured results show that the   switched beam antenna features a 27% impedance bandwidth (S-11 = -10   dB), a gain of 4.6 dBi, and a front-to-back ratio of 14 dB at 20 GHz   when the control voltage is applied to one of the switch pairs of the SPDT switch.

  • 13.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Pettersson, L
    Salter, M
    Platt, D
    Millimeter-wave tapered slot antenna for integration on micromachined low resistivity silicon substrates2009In: IEEE International Workshop on Antenna Technology, iWAT 2009: Small and Smart Antennas Metamaterials and Applications, 2009, p. 1-4Conference paper (Refereed)
  • 14.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Liquid metal stretchable unbalanced loop antenna2009In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 14, p. 144103-Article in journal (Refereed)
    Abstract [en]

    We present a 2.4 GHz unbalanced loop antenna that can be stretched along multiple dimensions simultaneously. It was realized by incorporating room temperature liquid metal alloy into microstructured channels in an elastic material. The demonstrated prototype exhibits a stretchability of up to 40% along two orthogonal orientations as well as foldability and twistability. Port impedance and radiation characteristics of the nonstretched and stretched antenna were studied numerically and experimentally. Measured results indicate a radiation efficiency of more than 80%.

  • 15.
    Cheng, Shi
    et al.
    Advanced Technology, Laird Technologies, Kista.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    A Microfluidic, Reversibly Stretchable, Large-Area Wireless Strain Sensor2011In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 21, no 12, p. 2282-2290Article in journal (Refereed)
    Abstract [en]

    This article describes the implementation and characterization of a new self-contained large-area wireless strain sensor, operating around 1.5 GHz, based on the concept of multi-layer microfluidic stretchable radiofrequency electronics (mu FSRFEs). Compared to existing solutions, the presented integrated strain sensor is capable of remotely detecting repeated high tensile dynamic strains of up to 15% over very large surfaces or movable parts, and gets rid of all hardwiring to external storage or data processing equipment. Unlike conventional electronic devices, the major part of the sensor is a mechanically reconfigurable and reversibly deformable patch antenna, which consists of two layers of liquid metal alloy filled microfluidic channels in a silicone elastomer. A simplified radiofrequency (RF) transmitter composed of miniaturized rigid active integrated circuits (ICs) associated with discrete passive components was assembled on a flexible printed circuit board (FPCB) and then heterogeneously integrated to the antenna. The elastic patch antenna can withstand repeated mechanical stretches while still maintaining its electrical function to some extent, and return to its original state after removal of the stress. Additionally, its electrical characteristics at frequency of operation are highly sensitive to mechanical strains. Consequently, not only is this antenna a radiator for transmitting and receiving RF signals like any other conventional antennas, but also acts as a reversible large-area strain sensor in the integrated device. Good electrical performance of the standalone antenna and the RF transmitter sub-module was respectively verified by experiments. Furthermore, a personal computer (PC)-assisted RF receiver for receiving and processing the measured data was also designed, implemented, and evaluated. In the real-life demonstration, the integrated strain sensor successfully monitored periodically repeated human body motion, and wirelessly transmitted the measured data to the custom-designed receiver at a distance of 5m in real-time.

  • 16.
    Cheng, Shi
    et al.
    Radio Hardware Division at Ericsson.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Microfluidic electronics2012In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 12, no 16, p. 2782-2791Article in journal (Refereed)
    Abstract [en]

    Microfluidics, a field that has been well-established for several decades, has seen extensive applications in the areas of biology, chemistry, and medicine. However, it might be very hard to imagine how such soft microfluidic devices would be used in other areas, such as electronics, in which stiff, solid metals, insulators, and semiconductors have previously dominated. Very recently, things have radically changed. Taking advantage of native properties of microfluidics, advances in microfluidics-based electronics have shown great potential in numerous new appealing applications, e. g. bio-inspired devices, body-worn healthcare and medical sensing systems, and ergonomic units, in which conventional rigid, bulky electronics are facing insurmountable obstacles to fulfil the demand on comfortable user experience. Not only would the birth of microfluidic electronics contribute to both the microfluidics and electronics fields, but it may also shape the future of our daily life. Nevertheless, microfluidic electronics are still at a very early stage, and significant efforts in research and development are needed to advance this emerging field. The intention of this article is to review recent research outcomes in the field of microfluidic electronics, and address current technical challenges and issues. The outlook of future development in microfluidic electronic devices and systems, as well as new fabrication techniques, is also discussed. Moreover, the authors would like to inspire both the microfluidics and electronics communities to further exploit this newly-established field.

  • 17.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Microfluidic Reversibly Stretchable Large-Area Wireless Strain Sensor2011In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 21, no 12, p. 2282-2290Article in journal (Refereed)
  • 18.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Microfluidic stretchable RF electronics2010In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 10, no 23, p. 3227-3234Article in journal (Refereed)
    Abstract [en]

    Stretchable electronics is a revolutionary technology that will potentially create a world of radically different electronic devices and systems that open up an entirely new spectrum of possibilities. This article proposes a microfluidic based solution for stretchable radio frequency (RF) electronics, using hybrid integration of active circuits assembled on flex foils and liquid alloy passive structures embedded in elastic substrates, e. g. polydimethylsiloxane (PDMS). This concept was employed to implement a 900 MHz stretchable RF radiation sensor, consisting of a large area elastic antenna and a cluster of conventional rigid components for RF power detection. The integrated radiation sensor except the power supply was fully embedded in a thin elastomeric substrate. Good electrical performance of the standalone stretchable antenna as well as the RF power detection sub-module was verified by experiments. The sensor successfully detected the RF radiation over 5 m distance in the system demonstration. Experiments on two-dimensional (2D) stretching up to 15%, folding and twisting of the demonstrated sensor were also carried out. Despite the integrated device was severely deformed, no failure in RF radiation sensing was observed in the tests. This technique illuminates a promising route of realizing stretchable and foldable large area integrated RF electronics that are of great interest to a variety of applications like wearable computing, health monitoring, medical diagnostics, and curvilinear electronics.

  • 19.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Foldable and stretchable liquid metal planar inverted cone antenna2009In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, no 12, p. 3765-3771Article in journal (Refereed)
    Abstract [en]

    A mechanically flexible planar inverted cone antenna (PICA) for   ultrawideband (UWB) applications is presented. It can be both folded   and stretched significantly without permanent damage or loss of   electrical functionality. The antenna is manufactured with a process in   which conductors are realized by injecting room temperature liquid   metal alloy into micro-structured channels in an elastic dielectric   material. The elastic dielectric material together with the liquid   metal enables bending with a very small radius, twisting, and   stretching along any direction. Port impedance and radiation   characteristics of the non-stretched and stretched antenna are studied   in simulations and experiments. The presented antenna has a return loss   better than 10 dB within 3-11 GHz and a radiation efficiency of > 70%   over 3-10 GHz, also when stretched. Tests verify that stretching up to   40% is possible with maintained electrical performance. The presented   antenna is useful for example for body-worn antennas and in   applications in harsh environments where mechanical flexibility helps   improve durability.

  • 20.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    A highly stretchable microfluidic meandered monopole antenna2009In: 13th International Conference on Miniaturized Systems for Chemistry and Life Sciences µTAS 2009, 2009, p. 1946-1948Conference paper (Refereed)
  • 21.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Yousef, Hanna
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kratz, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    79 GHz Slot Antennas Based on Substrate Integrated Waveguides (SIW) in a Flexible Printed Circuit Board2009In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, no 1, p. 64-71Article in journal (Refereed)
    Abstract [en]

    The design, fabrication and characterization of 79 GHz slot antennas based on substrate integrated waveguides (SIW) are presented in this paper. All the prototypes are fabricated in a polyimide flex foil using printed circuit board (PCB) fabrication processes. A novel concept is used to minimize the leakage losses of the SlWs at millimeter wave frequencies. Different losses in the SlWs are analyzed. SIW-based single slot antenna, longitudinal and four-by-four slot array antennas are numerically and experimentally studied. Measurements of the   antennas show approximately 4.7%, 5.4% and 10.7% impedance bandwidth (S-11 = -10 dB) with 2.8 dBi, 6.0 dBi and 11.0 dBi maximum antenna gain around 79 GHz, respectively. The measured results are in good agreement with the numerical simulations.

  • 22. Cheng, Shi
    et al.
    Öjefors, E.
    Magrell, J.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Materials Science. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Materialvetenskap.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Inverted-F Antenna for 3D integrated wireless sensor applications2007Conference paper (Refereed)
  • 23.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group. Signals and systems.
    Öjefors, Erik
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Ogden, Sam
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Materials Science.
    Magrell, J
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Materials Science.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Body surface backed flexible antennas for 17 GHz wireless body area networks sensor applications2007Conference paper (Refereed)
  • 24.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Ogden, Sam
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Margell, J.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Body Surface backed flexible antennas for 17 GHz wireless body area networks sensor applications2007Conference paper (Refereed)
  • 25.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Compact reflective microstrip phase shifter for travelling wave antenna applications2006In: IEEE Microwave and wireless components letters, Vol. 16, no 7Article in journal (Refereed)
  • 26.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Varactor diode phase shifters for electrically steerable microstrip travelling wave antennas2006Conference paper (Refereed)
  • 27.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Öjefors, Erik
    Magrell, J
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Inverted-F antenna for 3D integrated wireless sensor applications2007Conference paper (Refereed)
  • 28.
    Cheng, Shi
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Öjefors, Erik
    Ogden, Sam
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Gain and efficiency enhanced flip-up antennas for 3D integrated wireless sensor applications2007Conference paper (Refereed)
  • 29.
    Ferrari, Arnaud
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Gourie, Gabriel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Johnson, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Results of the EUROTeV Confocal Beam Position Monitor (CPBM) Task2008Report (Other academic)
    Abstract [en]

    This paper is the deliverable of the EUROTeV Confocal Beam Position Monitor(CPBM) task and gives an overview of the published results.

  • 30.
    Hallbjörner, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing. Signals and systems.
    Reverberation chamber for accurate antenna measurements within 2-30 GHz2007Conference paper (Refereed)
  • 31.
    Hallbjörner, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Karlsson, K
    Modified planar inverted code antenna for mobile communication handsets2007In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 6, p. 472-475Article in journal (Refereed)
    Abstract [en]

    The planar inverted cone antenna (PICA) is an antenna type that shows remarkably wideband performance. In its basic configuration, it is mounted on an infinite ground plane, and protrudes lambda/4 above it. This letter presents a study of the possibilities of integrating a PICA in a mobile terminal handset by modifying the ground plane and the radiating element. Port impedance and radiation performance are studied in both simulations and measurement.

  • 32.
    Hu, Xin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Tripodi, Lorenzo
    Philips Research, Eindhoven, Nederländerna.
    Matters-Kammerer, Marion K
    Technical University of Eindhoven, Nederländerna.
    Cheng, Shi
    Integrated Antennas AB, Uppsala.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    65-nm CMOS Monolithically Integrated Subterahertz Transmitter2011In: IEEE Electron Device Letters, ISSN 0741-3106, E-ISSN 1558-0563, Vol. 32, no 9, p. 1182-1184Article in journal (Refereed)
    Abstract [en]

    This letter presents a transmitter for subterahertz radiation (up to 160 GHz), which consists of a nonlinear transmission line (NLTL) and an extremely wideband (EWB) slot antenna on a silicon substrate of low resistivity (10 Omega . cm). The fabrication was realized using a commercially available 65-nm CMOS process. On-wafer characterization of the whole transmitter, of the stand-alone EWB antenna, and of the stand-alone NLTL is presented. Reflection measurements show that the stand-alone EWB antenna has a -10-dB impedance bandwidth in the frequency bands of 75-100 GHz and 220-325 GHz, which agrees very well with the simulation results. The simulated radiation patterns of the antenna are also presented, indicating that the transmitter has an ominidirectional performance. The output power of the NLTL alone and of the transmitter is measured up to 160 GHz, from which the power gain of the on-chip antenna is derived and has a maximum value of -9.5 dBi between 90 and 120 GHz.

  • 33.
    Malmqvist, Robert
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rantakari, P
    Samuelsson, C
    Lahti, M
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Saijets, J
    Vähä-Heikkilä, T
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Varis, J
    RF Mems based impedance matching networks for tunable multi-band microwave low noise amplifiers2009In: 2009 International Semiconductor Conference (CAS 2009), Sinaia, Romania, 2009Conference paper (Refereed)
  • 34.
    Malmqvist, Robert
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Samuelsson, C
    Carlegrim, B
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hanke, U
    Holter, B
    Sagberg, H
    Rantakari, P
    Vähä-Heikkilä, T
    Varis, J
    A 20 GHz antenna integrated RF MEMS based router and switching networks made on quartz2009In: Smart System Integration Conference, Bryssels, Belgien, 2009Conference paper (Refereed)
  • 35.
    Malmqvist, Robert
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Samuelsson, C.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Rantakari, P.
    Vähä-Heikkilä, T.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Varis, J.
    RF MEMS matching networks for frequency tunable SiGe LNA2010Conference paper (Refereed)
  • 36.
    Ogden, Sam
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Öjefors, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
    Fabrication of wireless sensor flip-up antennas2008In: Micro System Workshop MSW08, 2008, p. 61-Conference paper (Refereed)
  • 37. Pettersson, Lars
    et al.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Salter, Michael
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Platt, Duncan
    Compact Integrated Slot Array Antennas for the 79 GHz Automotive Band2010In: International Journal of Microwave and Wireless Technologies, Vol. 2, no 3-4, p. 305-316Article in journal (Refereed)
    Abstract [en]

    This paper presents two compact slot array antennas for the 79 GHz automotive band integrated into a 28 um thick benzocyclobutene (BCB) substrate attached to a 325 um thick 5 20 Omega cm bulk resistivity silicon wafer. The two antennas are a transmit (TX) 1x8 slot array antenna with a size of 1x23 mm and a receive (RX) M slot array antenna with a size of 15x23 mm. Promising performance has been measured with the TX and RX sub-array antennas (gain >4 dBi) with good matching to 50 11 (RL>10 dB) in the frequency range 70-90 GHz. By using a metal cavity, mounted on the back of the antenna, parallel plate modes could be reduced and the gain could also be increased by 2dB. The measured and the simulated results are consistent.

  • 38.
    Rydberg, Anders
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Ogden, Sam
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Integrated antennas for RF MEMS routers2008In: GigaHertz Symposium 2008, 2008Conference paper (Refereed)
  • 39. Saebboe, J
    et al.
    Viikari, V
    Varpula, T
    Seppä, H
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Al-Nuaimi, Mustafa
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Harmonic automotive radar for VRU classification2009In: Proceedings of International Radar Conference 2009, Bordeaux, France, 2009Conference paper (Refereed)
  • 40. Tripodi, Lorenzo
    et al.
    Hu, Xin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Goetzen, Reiner
    Matters-Kammerer, Marion K.
    van Goor, Dave
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Broadband CMOS Millimeter-Wave Frequency Multiplier With Vivaldi Antenna in 3-D Chip-Scale Packaging2012In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 60, no 12, p. 3761-3768Article in journal (Refereed)
    Abstract [en]

    This paper describes a frequency multiplier able to emit a broadband signal with a frequency range from 70 GHz up to at least 170 GHz. The device is composed of a nonlinear transmission line (NLTL) implemented in commercial CMOS 65-nm technology and an off-chip Vivaldi antenna. These two elements are packaged together with a 3-D chip-scale packaging technology. Characterization of the whole device and of the standalone NLTL is presented at frequencies up to 170 GHz.

  • 41.
    van Doremalen, Ric
    et al.
    Philips Applied Technologies, Eindhoven, The Netherlands.
    van Engen, Piet
    Philips Applied Technologies, Eindhoven, The Netherlands.
    Jochems, W
    Rommers, A
    Maas, G
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Fritzsch, T
    Wolf, J
    De Raedt, W
    Jansen, R
    Muller, P
    Alarcon, E
    Sanduleanu, Mihai
    Philips Applied Technologies, Eindhoven, The Netherlands.
    Wireless activity monitor using 3D integration2009In: Proceedings of Symposium on Design, Test, Integration and Package of MEMS/MOEMS (DTIP 2009), Rome, Italy, 2009Conference paper (Refereed)
  • 42.
    van Engen, Piet
    et al.
    Philips Applied Technologies, Smart Sensor Systems, Vision, Optics & Sensors, High Tech Campus 7, Eindhoven, The Netherlands.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    van Doremalen, Ric
    Philips Applied Technologies, Smart Sensor Systems, Vision, Optics & Sensors, High Tech Campus 7, Eindhoven, The Netherlands.
    Sanduleanu, Mihai
    Philips Applied Technologies, Smart Sensor Systems, Vision, Optics & Sensors, High Tech Campus 7, Eindhoven, The Netherlands.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Body surface backed flexible antennas and 3D Si-level integrated wireless sensor nodes for 17 GHz wireless body area networks2009In: Seminar at Antennas and Propagation for Body-Centric Wireless Communications, London, UK, 2009Conference paper (Refereed)
  • 43. van Engen, Piet
    et al.
    van Doremalen, Ric
    Jochems, W
    Rommers, A
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Fritzsch, T
    Wolf, J
    De Raedt, W
    Muller, P
    3D Si-level integration in wireless sensor node2009In: Smart System Integration Conference 2009, 2009Conference paper (Refereed)
  • 44. Viikari, V
    et al.
    Saebboe, J
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Kantanen, M
    Al-Nuaimi, Mustafa
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Varpula, T
    Lamminen, A
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Alastalo, A
    Mattila, T
    Seppä, H
    Pursula, P
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Technical solutions for automotive intermodulation radar for detecting vulnerable road users2009In: IEEE Vehicular Technology Conference, Barcelona, 2009Conference paper (Refereed)
  • 45.
    Yousef, H
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Kratz, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Substrate integrated waveguides in flexible PCB2008In: IMAPS Advanced Technology Workshop on RF and Microwave Packaging, 2008Conference paper (Refereed)
  • 46.
    Yousef, Hanna
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Kratz, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Substrate Integrated Waveguides (SIW) in a Flexible Printed Circuit Board for Millimeter Wave Applications2009In: Journal of microelectromechanical systems, ISSN 1057-7157, E-ISSN 1941-0158, Vol. 18, no 1, p. 154-162Article in journal (Refereed)
    Abstract [en]

    Substrate integrated waveguides (SIWs) are presented and demonstrated in a flexible printed circuit board (flex PCB) for application in the 77-81 GHz range. The vertical walls of the SIWs presented in this paper consist of multiple electrodeposited metallic wires. The diameters of these wires and the spacing between them are on the order of hundreds of nanometers. Hence, the walls can be seen as continuous metallic walls, and the leakage losses through them become negligible. In turn, the SIWs presented in this paper can operate at higher frequencies compared with previously presented structures that are realized with PCB fabrication processes. The attenuation of the SIWs is comparable to that of microstrip lines on the same sample. The SIWs are successfully demonstrated in a SIW-based slot antenna. The antenna gain along the z-axis (normal-to-plane) was found to be around 2.8 dBi at 78 GHz which is in agreement with the simulated values. [2008-0047]

  • 47.
    Öjefors, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Cheng, Shi
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    From, K.
    Skarin, I.
    Hallbjörner, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Electrically-steerable single-layer microstrip traveling wave antenna with varactor diode based phase shifters2007In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 55, no 9, p. 2451-2460Article in journal (Refereed)
    Abstract [en]

    The design of electrically steerable traveling wave microstrip antenna arrays is presented. Varactor diode based phase shifters implemented on the same metallic layer as the patch elements are used to provide a variable progressive phase shift in the array. Two antennas for the 5.8 GHz ISM band, manufactured as single layer printed designs on a standard PTFE soft substrate, are demonstrated. A ten-element beam-tilting vertical array using transmission type phase shifters is realized, yielding between 11.8 to 13.9 dBi gain for the 0deg to 11deg beam tilt tuning range. Using wide phase tuning range reflection type phase shifters a five-element horizontally scanning array with -32deg to 32deg steering range and 10.9-11.3 dBi gain has been realized.

1 - 47 of 47
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