Patent ID: 7102468

Claim:
A surface acoustic wave device having one or more stages of resonator-type electrode patterns arranged on a piezoelectric substrate along a propagation direction of a surface acoustic wave, and input and output terminals connected to said resonator-type electrode pattern, said resonator-type electrode pattern comprising: a plurality of IDT electrodes each including electrode fingers extended perpendicularly to the propagation direction of the surface acoustic wave; and a reflector interposed between a pair of IDT electrodes spaced from each other along said propagation direction of the surface acoustic wave, said reflector including four or more electrode fingers extended perpendicularly to said propagation direction of the surface acoustic wave and arranged with an electrode-finger pitch progressively decreased from the opposite ends of the reflector toward the center thereof wherein the maximum value of the electrode-finger pitch of said reflector is smaller than an average value of an electrode-finger pitch of said pair of IDT electrodes adjoining the reflector.