Double-mode surface-acoustic-wave device

摘要

A double-mode surface-acoustic-wave device, comprising: a piezoelectric substrate; first and second reflectors (10A, 10B) provided on said piezoelectric substrate along a propagation path of a surface acoustic wave on said piezoelectric substrate; first, second and third interdigital electrodes provided on said piezoelectric substrate consecutively from said first reflector to said second reflector; each of said first through third interdigital electrodes including first through third number of pairs of electrode fingers respectively; wherein said first number of pairs of electrode fingers for said first interdigital electrode is different from said third number of pairs of electrode fingers for said third interdigital electrode.