斜指形SAW滤波器中的衍射

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-10-22 DOI:10.1109/ULTSYM.2000.922533

H. Yatsuda

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引用次数: 4

摘要

本文的目的是描述斜指指间换能器(SFITs)的衍射效应。为了分析衍射效应，提出了两种计算SFIT辐射声表面波振幅分布的方法。一是计算不同中心频率的子滤波器在Smith等效电路中的声学端口的电功率，这些子滤波器是通过将sfit划分为若干通道而得到的。另一种方法是利用角谱法计算观测点处的声呐强度。采用角谱法计算了中心频率为40 MHz、带宽为6 MHz的SFIT滤波器的频率响应。理论与实验结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Diffraction in slanted finger SAW filters

The purpose of this paper is to describe diffraction effects on slanted finger interdigital transducers (SFITs). In order to analyze the diffraction effects, two methods to calculate SAW amplitude profiles radiated from an SFIT are presented. One is to calculate the electric power of the acoustic ports in the Smith's equivalent circuit for the sub-filters with different center frequencies, which were obtained by dividing SFITs into some channels. The other is to calculate the SAW intensity at an observation point using an angular spectrum method. The frequency responses of the SFIT filter with a center frequency of 40 MHz and a bandwidth of 6 MHz are calculated using the angular spectrum method. Good agreements between theoretical and experimental results are obtained.

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2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)

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