Surface acoustic wave resonators and ladder-type surface acoustic wave filter

摘要

PROBLEM TO BE SOLVED: To provide a means that suppresses spurious radiation caused in a surface acoustic wave resonator. ;SOLUTION: In a surface acoustic wave element comprising an interleaved weighting IDT electrode and a grating reflector, a stimulation region where a stimulation phase of a surface acoustic wave is inverted is not included in the inside of the IDT electrode and the interleaving weighting of the IDT electrodes is differentiated horizontally with respect to a propagation direction of a surface acoustic wave.;COPYRIGHT: (C)2003,JPO