Abstract
The design of planar surface acoustic wave convolvers is discussed, specifically with respect to beam compressor, waveguide, and output circuitry. It is shown that wide-band beam compression with a few tenths of a decibel in lossesand low excitation of undesired guide& modes may be implemented by multistrip structures. Further it is demonstrated how metal strip acoustic waveguides can be designed with only a few degrees of phase distortion over a 30 percent relative band- width in convolvers with timebandwidth products exceeding 3000. The convolver output configuration is modeled as a lossy coplanar electromagnetic waveguide, and it is shown how the output circuit should be designed to maintain the required bandwidth with aminimum of circuit losses. Measured data for several convolvers are presented.
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