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Foldable and stretchable liquid metal planar inverted cone antenna
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, Microsystems Technology.
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, Microsystems Technology.
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2009 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 57, no 12, 3765-3771 p.Article 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.

Place, publisher, year, edition, pages
2009. Vol. 57, no 12, 3765-3771 p.
Keyword [en]
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: urn:nbn:se:uu:diva-111193DOI: 10.1109/TAP.2009.2024560ISI: 000272313500013OAI: oai:DiVA.org:uu-111193DiVA: diva2:279753
Projects
wisenet
Available from: 2009-12-06 Created: 2009-12-06 Last updated: 2017-12-12Bibliographically 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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 698
Keyword
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
Electronics
Identifiers
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)
Opponent
Supervisors
Projects
wisenet
Available from: 2010-01-07 Created: 2009-12-06 Last updated: 2011-01-17Bibliographically approved

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Cheng, ShiWu, ZhigangHallbjörner, PaulHjort, KlasRydberg, Anders

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