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Suppression of acoustic resonances in bst-based bulk-ceramic varactors by addition of magnesium borate

Agrawal, P.; Kienemund, D.; Walk, D.; Matic, S.; Bohn, N. 1; Häuser, K. ORCID iD icon 1; Fink, T.; Abrecht, M.; Bigler, W.; Binder, J. R. 1; Jakoby, R.; Maune, H.
1 Karlsruher Institut für Technologie (KIT)


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, Mg$_{3}$B$_{2}$O$_{6}$ (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.

Verlagsausgabe §
DOI: 10.5445/IR/1000136137
Veröffentlicht am 12.08.2021
DOI: 10.3390/cryst11070786
Zitationen: 1
Web of Science
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2073-4352
KITopen-ID: 1000136137
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Crystals
Verlag MDPI
Band 11
Heft 7
Seiten 786
Nachgewiesen in Scopus
Web of Science
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