Surface acoustic wave filter with a passband formed by a longitudinally coupled filter and a resonator inductance
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United States of America Patent
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Apr 29, 2003
Grant Date -
Apr 18, 2002
app pub date -
Aug 17, 2001
filing date -
Aug 31, 2000
priority date (Note) -
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Abstract
A surface acoustic wave filter includes a longitudinally-coupled resonator-type surface acoustic wave filter having at least two interdigital transducers disposed on a piezoelectric substrate along the propagation direction of a surface acoustic wave, and at least one surface acoustic wave resonator connected between an input terminal and/or an output terminal and the longitudinally-coupled resonator-type surface acoustic wave filter. In this surface acoustic wave filter, a pass band is formed by utilizing at least one of the resonant modes of the longitudinally-coupled resonator-type surface acoustic wave filter and the inductance of the surface acoustic wave resonator.
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