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Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate

Agrawal, Prannoy ; Kienemund, Daniel ; Walk, Dominik ; Matic, Stipo ; Bohn, Nicole ; Häuser, Kevin ; Fink, Thomas ; Abrecht, Mike ; Bigler, Walter ; Binder, Joachim R. ; Jakoby, Rolf ; Maune, Holger (2021):
Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate. (Publisher's Version)
In: Crystals, 11 (7), MDPI, e-ISSN 2073-4352,
DOI: 10.26083/tuprints-00019437,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate
Language: English
Abstract:

This work presents a method for reducing acoustic resonances in ferroelectric barium strontium titanate (BST)-based bulk ceramic varactors, which are capable of operation in high-power matching circuits. Two versions of parallel-plate varactors are manufactured here: one with pure BST and one with 10 vol-% magnesium borate, Mg₃B₂O₆ (MBO). Each varactor includes a 0.85-mm-thick ferroelectric layer. Acoustic resonances that are present in the pure BST varactor are strongly suppressed in the BST-MBO varactor and, hence, the Q-factor is increased over a wide frequency range by the addition of small amounts of a low-dielectric-constant (LDK) MBO. Although the tunability is reduced due to the presence of non-tunable MBO, the increased Q-factor extends the varactor’s availability for low-loss and high-power applications.

Journal or Publication Title: Crystals
Journal volume: 11
Number: 7
Publisher: MDPI
Collation: 12 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics
Date Deposited: 03 Sep 2021 12:32
Last Modified: 03 Sep 2021 12:33
DOI: 10.26083/tuprints-00019437
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-194371
Additional Information:

Keywords: barium strontium titanate (BST); magnesium borate; acoustic resonances; electrostriction; bulk-ceramics

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19437
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