Surface acoustic wave filter

摘要

A surface acoustic wave filter includes a longitudinally-coupled resonator-type surface acoustic wave filter having at least two interdigital transducers disposed on a dielectric substrate along the propagation direction of a surface acoustic wave, and at least one surface acoustic wave resonator connected between an input terminal and/or an output terminal and the longitudinally-coupled resonator-type surface acoustic wave filter. In this surface acoustic wave filter, a pass band is formed by utilizing at least one of the resonant modes of the longitudinally-coupled resonator-type surface acoustic wave filter and the inductance of the surface acoustic wave resonator.