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Design and demonstration of acoustically optimized, fully-printed, BST MIM varactors for high power matching circuits

  • 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

This work addresses the piezoelectric induced reduction of quality factor in fully-printed metal-insulator-metal (MIM) barium strontium titanate (BST) thick film varactors designed for high power operation. An acoustically optimized varactor design is presented and compared to a non-optimized high-power varactor. The design is utilized to present a narrowband acoustic suppression technique based on defined weights. The acoustically optimized varactor consists of 162 varactor cells in a capacitive matrix. The cells in the matrix are interconnectable allowing for a variable unbiased capacitance and power rating. Due to this setup, surface acoustic waves are interrupted, and the reduced size of the cells allows for a reduced BST layer thickness, shifting the acoustic resonance away from the operational frequency. Therefore, an inverted behavior in comparison to the high-power varactor is observed with an increasing quality factor with biasing voltage. Compared to the high-power varactor, the acoustically optimized varactor design shows a 40% increased quality factor in biased state. By applying the narrowband acoustic suppression technique, an increase in quality factor of 145% is achieved compared to the unsuppressed design. In comparison to the high-power varactor, the acoustical suppressed design shows an increase in quality factor of 480% at the first acoustic resonance frequency.

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Copyright

Corresponding author

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

References

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