SURFACE ACOUSTIC WAVE FILTER

摘要

A surface acoustic wave filter comprises a piezoelectric substrate, a plurality of surface acoustic wave channels arranged on the piezoelectric susbtrate, and reflector arranged across the surface acoustic wave channels. An input interdigital transducer is arranged on at least one of the surface acoustic wave channels. An output interdigital transducer is arranged on at least one of the other surface acoustic wave channels. The input interdigital transducer and output interdigital transducer are arranged on the same side with respect to the reflector. As a result, this surface acoustic wave filter is short in the direction of propagation and has a frequency characteristic of good squareness ratio.