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  • 1.
    Bjurman, Peter
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Li, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Automated scan station for 3D measurements of millimetre wave antennas2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As the importance of high frequency antennas increase in the world so does the needfor accurate measurements of the antenna performance.This project has endeavoured to create an automated scan station that can measurethe antenna performance from an EHF (extremely high frequency) antenna.These points are measured spherically around the antenna.A tested design from the Helsinki University that requires only two degrees offreedom to achieve spherical measurements was used. A network analyzer is used asthe measuring instrument along with the receiver antenna attached to the stationsarms. All components are controlled and monitored through a computer usingsoftware designed in LabVIEW.A backlash due to high tolerances on the two axle wedges was discovered duringassembly and a solution was devised using thread tape, however its effect has notbeen tested. The project was worked on during the summer holidays which resultedin delays on ordered parts, because of this the motor control from the LabVIEWprogram has not yet been implemented. This also means that the automated sequencethat performs the measurements has not been tested.With an implemented motor control and reduced backlash from the wedges the scanstation is expected to achieve high accuracy and reliability.

  • 2.
    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, 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.

  • 3. Bruce, Staffan
    et al.
    Vandamme, L. K. J.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Measurement of low-frequency base and collector current noise and coherence in SiGe heterojunction bipolar transistors using transimpedance amplifiers1999In: IEEE Transactions on Electron Devices, ISSN 0018-9383, E-ISSN 1557-9646, Vol. 46, no 5, p. 993-1000Article in journal (Refereed)
  • 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
  • 6.
    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)
  • 7.
    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.

  • 8.
    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)
  • 9.
    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.

  • 10.
    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)
  • 11.
    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%.

  • 12.
    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.

  • 13.
    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.

  • 14.
    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)
  • 15.
    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.

  • 16.
    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)
  • 17.
    Grudén, Mathias
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Westman, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Platbardis, Janis
    TNT-Elektronik AB, Säter.
    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.
    Reliability Experiments for Wireless Sensor Networks in Train Environment2009In: European Microwave Week (EuMWeek), Second European Wireless Technology Conference, EuWIT, 2009, p. 37-40Conference paper (Refereed)
  • 18. Hjerdt, J.
    et al.
    Grundén, Mathias
    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.
    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.
    Ekegren, T.
    Bergqvist, J.
    Near field terahertz imaging for biological tissue measurements2010Conference paper (Refereed)
  • 19.
    Hu, Xin
    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.
    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.
    Low-profile directive antenna using metamaterial slab for RFID tags2010Conference paper (Refereed)
  • 20.
    Jaff, Bestoon
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Jobs, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Lantz, Fredrik
    FOI Totalförsvarets forskningsinstitut, Linköping.
    Lewin, Britta
    FOI Totalförsvarets forskningsinstitut, Linköping.
    Jansson, Erik
    Hectronic AB, Uppsala.
    Antoni, Jonas
    Hectronic AB, Uppsala.
    Brunberg, Kjell
    Hectronic AB, Uppsala.
    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.
    A wireless body area network (WBAN) based tracking and monitoring application system2009In: Seminar on Antennas and Propagation for body-centric wireless communications, London, UK, 2009Conference paper (Refereed)
  • 21.
    Jobs, Magnus
    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.
    Grundén, Mathias
    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.
    Hallbjorner, Paul
    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.
    Antenna diversity with opportunistic combining for ASk systems with single channel receivers2010In: Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP), 2010, p. 1-5Conference paper (Refereed)
  • 22.
    Jobs, Magnus
    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.
    Grundén, Mathias
    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.
    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.
    Wireless body area networks (WBANs) and efficient energy conservative designs2010Conference paper (Refereed)
  • 23.
    Jobs, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Jaff, Bestoon
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Lantz, Fredrik
    FOI Totalförsvarets forskningsinstitut, Linköping.
    Lewin, Britta
    FOI Totalförsvarets forskningsinstitut, Linköping.
    Jansson, Erik
    Hectronic AB, Uppsala.
    Antoni, Jonas
    Hectronic AB, Uppsala.
    Brunberg, Kjell
    Hectronic AB, Uppsala.
    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.
    Wireless body area network (WBAN) monitoring application system (MASS) for personal monitoring2009In: 6th edition of the International Workshop on Wearable Micro and Nano Technologies for Personalised Health (pHealth 2009), Oslo, Norge, 2009Conference paper (Refereed)
  • 24.
    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)
  • 25.
    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)
  • 26.
    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)
  • 27.
    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)
  • 28.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Wireless sensor networks: The greatest innovation since internet2010In: Projects, no 14, p. 70-71Article in journal (Refereed)
  • 29.
    Rydberg, Anders
    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.
    Jobs, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Lantz, F.
    Lewin, B.
    Jansson, E.
    Brunberg, K.
    Wireless body area network (WBAN) systems for personal monitoring and biomedical regulation2010Conference paper (Other academic)
  • 30.
    Rydberg, Anders
    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.
    Westman, A.
    Grundén, Mathias
    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.
    Platbardis, J.
    Hallbjörner, Paul
    Techniques for communication robustness in train environment2010Conference paper (Refereed)
  • 31. 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)
  • 32. Sanchez-Heredia, Juan D.
    et al.
    Grudén, Mathias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    Valenzuela-Valdes, Juan F.
    Sanchez-Hernandez, David A.
    Sample-Selection Method for Arbitrary Fading Emulation Using Mode-Stirred Chambers2010In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 9, p. 409-412Article in journal (Refereed)
    Abstract [en]

    Mode-stirred chambers (MSCs) consist of one or more resonant cavities coupled in some way in order to allow the measurement of different antenna parameters such as antenna efficiency, correlation, diversity gain, or multiple-input-multiple-output (MIMO) capacity, among others. In a single-cavity MSC, also known as a reverberation chamber (RC), the environment is isotropic and the amplitude of the signal is Rayleigh distributed. Real environments, however, rarely follow an isotropic Rayleigh-fading scenario. Previous results have shown that a Rician-fading emulation can be obtained via hardware modification using an RC. The different methods lack from an accurate emulation performance and are strongly dependent upon chamber size and antenna configurations. With the innate complexity of more-than-one-cavity MSC, the coupling structure generates sample sets that are complex enough so as to contain different clusters with diverse fading characteristics. This letter presents a novel method to accurately emulate a more realistic Rician-fading distribution from a Rayleigh-fading distribution by selecting parts of the sample set that forms different statistical ensembles using a complex two-cavity multi-iris-coupled MSC. Sample selection is performed using a genetic algorithm. Results demonstrate the potential of MSCs for versatile MIMO fading emulation and over-the-air (OTA) testing. The method is patent protected by EMITE Ing., Murcia, Spain.

  • 33.
    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)
  • 34.
    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)
  • 35. 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)
  • 36. 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)
  • 37. Wennström, Mathias
    et al.
    Strandell, Jonas
    Öberg, Tommy
    Lindskog, Erik
    Rydberg,, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology.
    An Auto-Calibrating Adaptive Array for Mobile Telecommunications2000In: IEEE Transactions on Aerospace and Electronic Systems, ISSN 0018-9251, E-ISSN 1557-9603, Vol. 36, no 2, p. 729-736Article in journal (Refereed)
  • 38.
    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]

1 - 38 of 38
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