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

  • Daniel Kienemund (a1), Nicole Bohn (a2), Thomas Fink (a3), Mike Abrecht (a3), Walter Bigler (a3), Joachim R. Binder (a2), Rolf Jakoby (a1) and Holger Maune (a1)...

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.

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Corresponding author

Author for correspondence: Daniel Kienemund E-mail: kienemund@imp.tu-darmstadt.de

References

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Keywords

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

  • Daniel Kienemund (a1), Nicole Bohn (a2), Thomas Fink (a3), Mike Abrecht (a3), Walter Bigler (a3), Joachim R. Binder (a2), Rolf Jakoby (a1) and Holger Maune (a1)...

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