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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.
In: Crystals, 11 (7)
doi: 10.3390/cryst11070786
Article, Bibliographie

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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.

Item Type: Article
Erschienen: 2021
Creators: 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
Type of entry: Bibliographie
Title: Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate
Language: English
Date: 2021
Place of Publication: Darmstadt
Publisher: MDPI
Journal or Publication Title: Crystals
Volume of the journal: 11
Issue Number: 7
Collation: 12 Seiten
DOI: 10.3390/cryst11070786
Corresponding Links:
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.

Additional Information:

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

Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP)
Date Deposited: 06 Dec 2023 09:03
Last Modified: 06 Dec 2023 09:03
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