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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Analysis and design of focused interdigital transducers
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Analysis and design of focused interdigital transducers

机译：聚焦叉指式换能器的分析与设计

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Focused interdigital transducers (FIDTs) can generate surface acoustic wave (SAW) with high intensity and high beamwidth compression ratio. Owing to these features, they are very suitable to be used as the sources of microacoustic channels or waveguides in the near future. The focusing properties of FIDTs are dominated solely by their geometric shapes. Therefore, to obtain optimal performance, it is essential to analyze the FIDTs with a variety of geometric shapes. However, among the existing studies concerning the diffraction of FIDTs, a detailed analysis and design of FIDTs is still in paucity. In this paper, we adopted the exact angular spectrum of plane wave theory (ASoW) to calculate the amplitude fields of FIDTs on Y-Z lithium niobate (LiNbO/sub 3/) with the shape as a concentric circular arc and the concentric wave surface. Based on the calculation results, we discussed the variations of the amplitude fields induced by changing number of pairs, degree of arc, and geometric focal length. In addition, the focusing properties of FIDTs on the (100)-oriented GaAs substrate were also analyzed and discussed. We also summarized the guiderules for designing a FIDT via four important factors. It is worth noting that the results of this study provide an important basis for designing various FIDTs to fit the desired applications.
机译：聚焦的叉指换能器（FIDT）可以产生具有高强度和高束宽压缩比的表面声波（SAW）。由于这些特征，它们非常适合在不久的将来用作微声通道或波导的源。 FIDT的聚焦特性仅由其几何形状决定。因此，为了获得最佳性能，必须分析具有​​各种几何形状的FIDT。但是，在有关FIDTs衍射的现有研究中，对FIDTs的详细分析和设计仍然很少。本文采用平面波理论的精确角谱（ASoW）来计算Y-Z铌酸锂（LiNbO / sub 3 /）上具有同心圆弧和同心波表面形状的FIDT的振幅场。根据计算结果，我们讨论了因线对数量，弧度和几何焦距的变化而引起的振幅场的变化。此外，还分析和讨论了FIDT在（100）取向GaAs衬底上的聚焦特性。我们还总结了通过四个重要因素设计FIDT的指南。值得注意的是，这项研究的结果为设计各种FIDT以适合所需的应用提供了重要的基础。

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