Synthesis of slanted and quasi-slanted SAW transducers
Synthesis of slanted and quasi-slanted SAW transducers
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倾斜和准倾斜声表面波换能器的合成
DOI：
10.1109/tuffc.2004.1324404
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Lee
中科院分区：
文献类型：
--
作者：
E. Bausk;R. Taziev;A. Lee
本文主要研究在声表面波传播方向上电极周期可变的叉指换能器的综合，包括直电极（倾斜或扇形叉指换能器）和阶梯电极（准倾斜叉指换能器）。电极的极性加权是在扇形（倾斜）换能器中实现高频选择性的唯一工具。准倾斜换能器（QST）提供了额外的机会：优化孔径，周期和声道的相对位移。此外，离散变迹为QST在实现期望的频率响应方面提供了额外的灵活性，而不增加SAW衍射灵敏度。原始的合成算法已经开发出用于优化SAW滤波器中具有广泛特性的倾斜和准倾斜叉指换能器。
This paper is devoted to the synthesis of interdigital transducers (IDTs) with variable electrode periodicity in the direction orthogonal to the SAW propagation, including straight electrodes (slanted or fan-shaped IDTs) and stepped electrodes (quasi-slanted IDTs). A polarity weighting of electrodes is the only tool for realization of high-frequency selectivity in fan-shaped (slanted) transducers. Quasi-slanted transducers (QST) offer additional opportunities: optimization of apertures, periods, and relative shifts of acoustic channels. Moreover, a discrete apodization gives an extra flexibility for QSTs in realization of desired frequency responses without increasing SAW diffraction sensitivity. Original synthesis algorithms have been developed for optimization of slanted and quasi-slanted IDTs in SAW filters with a wide range of characteristics.