Abstract
This paper will discuss a new focusing interdigital transducer (FIDT) design which can be utilized in a monolithic SAW convolver to compress the beamwidth of a surface acoustic wave propagating in the z direction of y cut lithium niobate. Due to the strong anisotropy of this crystal cut, a FIDT with constant radius curvature cannot be used. Instead, the curvature must be a function of the SAW phase and energy velocity properties of the crystal. To determine this function a simple theory has been developed and used together with published velocity data to computer generate the proper electrode shapes. Performance and optical laser probe data for two experimental FIDT's will be shown.
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