Patent ID: 6606016
Filing Date: 2003-08-12
Classification: H03H

Abstract:
A surface acoustic wave device comprising:a first surface acoustic wave filter connected between an input terminal and an output terminal; a second surface acoustic wave filter having a different center frequency than that of said first surface acoustic wave filter, and which is connected between said input terminal and said output terminal and in parallel with said first surface acoustic wave filter; and at least one one-port surface acoustic wave resonator connected in series with the first surface acoustic wave filter or the second surface acoustic wave filter, on at least one side between said input terminal and at least one of said first and second surface acoustic wave filters, or between said output terminal and at least one of said first and second surface acoustic wave filters; wherein the anti-resonance frequency of said one one-port surface acoustic wave resonator is positioned on the side of higher frequencies than those of the pass band of the surface acoustic wave filter disposed on the side where said one-port surface acoustic wave resonator is connected in series; and in at least one one-port surface acoustic wave resonator of said one-port surface acoustic wave resonators, the interdigital transducers are weighted.