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Diffraction analysis of slanted finger interdigital transducers

For analysis, Slanted Finger Interdigital Transducers (SFIT) are usually divided into many channels in parallel to the propagation direction. Every channel is considered to be a subfilter. This procedure neglects the diffraction completely. The present paper introduces the diffraction in the SFIT analysis by use of the Angular Spectrum of Plane Waves (ASPW) approach. The analysis is based on a one component bulk wave model. The model is used for analyzing a unidirectional SFIT filter, the transducers of which are composed of SPUDT cells on 37/spl deg/ YX quartz. The simulated transmission behavior is compared with experimental results. Good agreement is found.