Surface acoustic wave design fundamentals

Abstract

This paper will provide a fundamental approach to the design of SAW transducers and filters. Although SAW devices are often modeled with complex and large programs, the basic design principles can be analyzed with simple programs and commercially available analysis tools, such as Mathcad or Matlab. The beginning of the paper reviews the basis for the impulse response model. Design equations for fundamental window time functions as applied to apodized transducers will be presented. The development shows an analytical approach to the solution of apodized transducers. The solutions provide the SAW radiating beam profile as a function of frequency as well as the frequency dependent acoustic transducer parameters. The electrical network effects on the overall transducer response are presented which provides a complete first order analysis for fundamental SAW trandsucer design.