Equivalent Networks for Surface Acoustic Wave Metallic Gratings

Abstract
An equivalent network approach is described for the anlysis of surface acoustic wave metallic gratings. Circuit parameters can be theoretically determined by applying the finite-element method to an infinite array. To show the validity and usefulness of this approach, examples are computed for aluminum strips on 128°Y–X LiNbO3, ST–X quartz, X–112°Y LiTaO3, and 45°X–Z Li2B4O7 substrates. Results show that for the Al/45°X–Z Li2B4O7 structure, the reflection magnitude per strip is large and the influence of the change of strip-thickness on the center-frequency shift is small.

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