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, 2021, 11 (7)
doi: 10.26083/tuprints-00019437
Article, Secondary publication, Publisher's Version
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| Item Type: | Article |
|---|---|
| Type of entry: | Secondary publication |
| Title: | Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate |
| Language: | English |
| Date: | 3 September 2021 |
| Place of Publication: | Darmstadt |
| Year of primary publication: | 2021 |
| Publisher: | MDPI |
| Journal or Publication Title: | Crystals |
| Volume of the journal: | 11 |
| Issue Number: | 7 |
| Collation: | 12 Seiten |
| DOI: | 10.26083/tuprints-00019437 |
| Corresponding Links: | |
| Origin: | Secondary publication via sponsored Golden Open Access |
| 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. |
| Status: | Publisher's Version |
| URN: | urn:nbn:de:tuda-tuprints-194371 |
| 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 > Institute for Microwave Engineering and Photonics (IMP) |
| Date Deposited: | 03 Sep 2021 12:32 |
| Last Modified: | 06 Dec 2023 09:01 |
| URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/19437 |
| PPN: | 485289687 |
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