Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate
Suppression of Acoustic Resonances in BST-Based Bulk-Ceramic Varactors by Addition of Magnesium Borate
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DOI：
10.3390/cryst11070786
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发表时间：
2021-07
期刊：
影响因子：
2.7
通讯作者：
Prannoy Agrawal;D. Kienemund;D. Walk;Stipo Matic;N. Bohn;Kevin Häuser;Thomas Fink;M. Abrecht;Walter Bigler;J. Binder;R. Jakoby;H. Maune
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文献类型：
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作者：
Prannoy Agrawal;D. Kienemund;D. Walk;Stipo Matic;N. Bohn;Kevin Häuser;Thomas Fink;M. Abrecht;Walter Bigler;J. Binder;R. Jakoby;H. Maune
本工作提出了一种用于减少铁电体陶瓷变容管中的声谐振的方法，该变容管能够在高功率匹配电路中工作。两个版本的平行板变容二极管在这里制造：一个纯BST和一个10体积%的硼酸镁，Mg3 B2 O 6（MBO）。每个变容二极管包括0.85毫米厚的铁电层。在纯BST变容管中存在的声共振在BST-MBO变容管中被强烈抑制，因此，通过添加少量的低介电常数（LDK）MBO，在宽的频率范围内增加Q因子。虽然由于不可调谐MBO的存在而降低了可调谐性，但是增加的Q因子扩展了变容二极管对于低损耗和高功率应用的可用性。
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.