Patent ID: 6424240
Filing Date: 2002-07-23
Classification: H03H

Abstract:
A surface acoustic wave filter device comprising:a plurality of surface acoustic wave filters formed on a common substrate, each of the surface acoustic wave filters comprising, as arranged on a surface of a piezoelectric layer formed at a surface layer portion of the substrate, at least one interdigital electrode and a grating reflector disposed at each of opposite sides of the interdigital electrode with respect to the direction of propagation of surface acoustic waves, the filter device being characterized in that at least two of the surface acoustic wave filters which are adjacent to each other share one grating reflector as the grating reflector to be disposed at one of the opposite sides of the interdigital electrode of each of the adjacent filters, each of the adjacent filters has one input terminal for receiving an input signal from outside of the substrate and one output terminal for delivering an output signal to outside of the substrate.