An efficient method of including electrode interactions in the Green's function model for SAW interdigital transducers

Abstract

Electrode interactions are a major cause of in-band ripples in SAW filters. In the past, the effect of these interactions has been modeled on devices with periodic electrodes either with the aid of Coupling of Modes (COM) theory, or by adopting the quasi-static Green's function method. In this paper, we extend the quasi-static Green's function to include electro-acoustic regeneration in transducers with non-periodic electrodes. The simulation of a dispersive delay line is given as an example.