Surface elastic wave device

摘要

A surface elastic wave device comprising a substrate of an insulating material, a thin film of a piezoelectric material provided on said substrate, input transducer means for transmitting surface elastic wave, and output transducer means for receiving the surface elastic wave. At least one of the input and output transducer means includes a comb-like electrode which comprises interdigital fingers, and a plurality of electrodes which extend across the interdigital fingers in opposing relationship with the comb-like electrode, with the thin film being interposed between the plurality of electrodes and the comb-like electrode. The output transducer means may be arranged to receive or eliminate only surface elastic wave which is permitted to propagate in a direction which is different from that perpendicular to the longitudinal direction of the aforementioned interdigital fingers.