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Low loss, fully-printed, ferroelectric varactors for high-power impedance matching at low ISM band frequency

Published online by Cambridge University Press:  23 May 2019

Daniel Kienemund ,
Nicole Bohn ,
Thomas Fink ,
Mike Abrecht ,
Walter Bigler ,
Joachim R. Binder ,
Rolf Jakoby  and
Holger Maune
Daniel Kienemund*
Affiliation:
Institut für Mikrowellentechnik und Photonik, Technische Universität Darmstadt, Darmstadt, Germany;
Nicole Bohn
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Thomas Fink
Affiliation:
COMET AG, Flamatt, Switzerland
Mike Abrecht
Affiliation:
COMET AG, Flamatt, Switzerland
Walter Bigler
Affiliation:
COMET AG, Flamatt, Switzerland
Joachim R. Binder
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Rolf Jakoby
Affiliation:
Institut für Mikrowellentechnik und Photonik, Technische Universität Darmstadt, Darmstadt, Germany;
Holger Maune
Affiliation:
Institut für Mikrowellentechnik und Photonik, Technische Universität Darmstadt, Darmstadt, Germany;
*
Author for correspondence: Daniel Kienemund E-mail: kienemund@imp.tu-darmstadt.de
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Abstract

Low loss, ferroelectric, fully-printed varactors for high-power matching applications are presented. Piezoelectric-induced acoustic resonances reduce the power handling capabilities of these varactors by lowering the Q-factor at the operational frequency of 13.56 MHz. Here, a quality factor of maximum 142 is achieved with an interference-based acoustic suppression approach utilizing double metal–insulator–metal structures. The varactors show a tunability of maximum 34% at 300 W of input power. At a power level of 1 kW, the acoustic suppression technique greatly reduces the dissipated power by 62% from 37 W of a previous design to 14.2 W. At this power level, the varactors remain tunable with maximum 18.2% and 200 V of biasing voltage.

Keywords

High powertunablefully-printedISM band
Type
EuMW 2018
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Special Issue 7: MIKON 2018 / EuMW 2018 (Part II) , September 2019 , pp. 658 - 665
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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