Surface acoustic wave resonator

摘要

A surface acoustic wave resonator includes a base plate made of glass and a layer of piezoelectric material which has a plurality of strips extending parallel to each other for forming a reflector. A surface acoustic wave excited from a transducer reflects at each of the strips. The reflectance of such surface acoustic wave is improved by the arrangement of the strips and the thickness of the layer. On the other hand, the temperature coefficient of the resonance frequency is also improved by the arrangement of the strips and the thickness of the layer, and by the amount of the alkali metal oxide contained in the base plate, and further by the thickness of silicon oxide film laminated on the surface of the base plate.