Patent ID: 6828878
Filing Date: 2004-12-07
Classification: H03H

Abstract:
A surface acoustic wave device comprising:a piezoelectric substrate; at least one surface acoustic wave filter provided on the piezoelectric substrate and including at least two interdigital transducers arranged along a direction in which a surface acoustic wave propagates; and at least one surface acoustic wave resonator provided on the piezoelectric substrate and connected in series to said at least one surface acoustic wave filter; wherein said at least one surface acoustic wave resonator is arranged such that a resonant frequency thereof is located within a pass band of said at least one surface acoustic wave filter and such that an antiresonant frequency thereof is located outside the pass band, and a dummy electrode is disposed between an electrode finger and a bus bar of each of said at least one surface acoustic wave resonator such that a spurious response caused by a surface skimming bulk wave is located within the pass band.