This thesis describes an innovative technique for determining the impulse response of a SAW device including the effects of diffraction on both isotropic and anisotropic substrates. The approach presented is unique in that it determines the point-to-point impulse response for the isotropic case using the two-dimensional wave equation, and utilizes a double integral reduction technique to determine the tap-to-tap response, thereby significantly reducing the complexity of the calculations involved. An extension is then made to describe the impulse response of two cascaded transducers of arbitrary geometry, along with some simplifying cases. Previous attempts to model diffraction effects generally utilized either the Fresnel Integral or the Angular Spectrum of Plane Waves approach. The Fresnel Integral technique is inherently adequate to describe diffraction effects accurately only for the narrowband case, while the Angular Spectrum of Plane Waves requires an integration over frequency if the broadband case is to be considered. The approach presented in this thesis provides an impulse response which is valid over a wide range of frequencies, which allows for an accurate description of diffraction effects for the broadband case. The isotropic impulse response is used as an approximation to the anisotropic response, taking into account the variation of surface wave speed and coupling coefficient with propagation direction.
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Master of Science (M.S.)
College of Engineering
Electrical Engineering and Communication Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Hines, Jacqueline Hanvey, "A New Method for Broadband Surface Acoustic Wave Diffraction Analysis" (1988). Retrospective Theses and Dissertations. 4289.