Microwave Network Analyses of Surface Acoustic Waveguides-I. Flat Overlay Guides.

摘要

A new approach is described for the systematic analysis of a variety of waveguides for surface acoustic waves on isotropic solids, and explicit results are presented which in most cases are either the only analytical solutions available or ones which furnish superior accuracy. This new approach adapts the techniques of microwave network theory to guided acoustic wave problems, so that many of the powerful methods developed in the context of electromagnetic microwaves can be applied to advantage. These methods utilize transmission lines and equivalent networks which look electrical but are actually purely acoustic. They furnish physical insight and are particularly helpful to those trained in transmission line theory. The basic elements of this new approach are explained in the paper. Waveguides for acoustic surface waves fall into two classes: overlay guides and topographic guides; the most important ones in each class are treated here. In Paper I, the strip and slot guides are discussed, and in Paper II, the topographic and overlay rectangular ridge guides are analyzed. For each of the waveguides treated, analytical (not simply numerical) results for the dispersion relations are presented, curves for the dispersion behavior are included, and comparisons with other theories and with measurements (where available) are indicated. (Author)