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Switched beam antenna based on RF MEMS SPDT switch on quartz substrate
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology. (MicroWaveGroup)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microwave and Terahertz Technology. (MicroWaveGroup)
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2009 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 8, 383-386 p.Article 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.

Place, publisher, year, edition, pages
2009. Vol. 8, 383-386 p.
Keyword [en]
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
URN: urn:nbn:se:uu:diva-111192DOI: 10.1109/LAWP.2009.2018712ISI: 000267792700020OAI: oai:DiVA.org:uu-111192DiVA: diva2:279752
Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2016-04-14Bibliographically approved
In thesis
1. Integrated Antenna Solutions for Wireless Sensor and Millimeter-Wave Systems
Open this publication in new window or tab >>Integrated Antenna Solutions for Wireless Sensor and Millimeter-Wave Systems
2009 (English)Doctoral 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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 114 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 698
harmonic radar (HR), liquid alloy, millimeter-wave, micromachining, phase shifters, planar inverted cone antennas (PICA), printed circuit boards (PCB), quasi-Yagi antennas, radio frequency microelectromechanical system (RF MEMS), stretchable antennas, substrate integrate waveguides (SIW), T-matched dipole antennas, tapered slot antennas, traveling wave array antennas, ultrawideband (UWB), wireless sensor networks.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
urn:nbn:se:uu:diva-111197 (URN)978-91-554-7681-6 (ISBN)
Public defence
2010-01-29, Siegbhansalen, Lägerhyddsvägen 1, The Ångström Laboratory, Uppsala, 13:30 (English)
Available from: 2010-01-07 Created: 2009-12-06 Last updated: 2011-01-17Bibliographically approved

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