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Ultrasonic Transducers by K Nakamura

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11

Surface acoustic wave (SAW) devices

K. Hashimoto,     Chiba University, Japan

Abstract:

This chapter aims to give the basics of surface acoustic wave (SAW) devices. First, the basic operation of interdigital transducers (IDTs) is discussed. The delta-function model is introduced, and the coupling-of-modes theory is adopted to allow for the influence of SAW reflection in the analysis. Next, SAW transversal filters are discussed. We explain their basic operation and design, and then their achievable performances are discussed. It is also shown that some of the difficulties caused in traditional SAW transversal filters can be overcome by the use of unidirectional IDTs. Finally, SAW resonators are discussed. After giving their basics, an overview ...

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