Equivalent networks for SAW gratings

Abstract- An equi~alen t network approa~h is deseribed for the anal-ys is or surface al:oustlc wave gra tings. Circuit parameters can be. the-oret ically determined by applying the finite·element method to a n in-finite array. In this approach, all of Ihe effects of piezoe ie~tdc perturbation, mechanical perturbation, and energy storage are taken into account. To show the "alidity and usefulness of this a pproach, examples are computed for groove and metallic gratings. Both short and open ci rcuited metallic gratings are treated. For grooves on iSD-tropic and Y-Z LlNbOj substrates, the dependence of renection char-acterisllcs on groove depth is investigated. For aluminum strips on X· lU " Y LlTaOl, 34 " Y · X quartz, Y-Z LiNbO j, and U S " Y-X LiNbOJ sub-strates, t he dependence on metallization rlll io is illvtstigated in detail. A N EQUIVALENT CIRCUIT of a step discontinuity in surface-acoustic-wave (SAW) gratings is of inter-est in many SAW devices such as delay lines, filters, re