SAW device impulse response modeling using broadband diffraction theory

An approach to obtaining a two-dimensional impulse-response diffraction model valid for the broadband case has been developed by J.H. Hines (1988). This approach utilizes a double integral reduction technique to determine the tap to tap response, and has been used to analyze various tap configurations on both isotropic and anisotropic substrates. In the present work, the authors give an extension of this analysis technique to model the effects of diffraction on the impulse response of a complete SAW (surface acoustic wave) device. Both isotropic and anisotropic substrates are treated. Also considered are the implications of the two-dimensional nature of the mathematical formulation of the model, and how the results of this formulation influence the validity of the model. Comparison is made between theoretical and experimentally observed device performance. The potential exists for this analysis technique to be applied to broadband diffraction compensation.<>