Surface acoustic wave device

摘要

A surface acoustic wave device includes a piezoelectric substrate having opposite flat surfaces. On one surface of the substrate, there are provided launching transducer for launching acoustic waves and receiving transducer for receiving the launched acoustic waves. On the other surface of the substrate, there are provided a plurality of grooves aligned in an angled relation with the direction of propagation of the acoustic waves. The grooves are divided into two or more groups in which the depth of the grooves in one group is different from that in any other group.