Resonator filter cascade
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United States of America Patent
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Feb 22, 2005
Grant Date -
Aug 28, 2003
app pub date -
Nov 25, 2002
filing date -
Dec 14, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A resonator filter cascade has resonator structures disposed adjacent to one another and form a waveguide for acoustic surface waves, and coupling transducers. The present invention changes resonator filter cascades so that the insertion attenuation is reduced by decreasing the attenuation of cascading, without using a coupling coil. A resonator filter cascade has resonator structures having coupling transducers which transversely couple resonator filters and the coupling transducers, belonging the same transversely coupled resonator filter, are not connected with one another. Coupling transducers of different transversely coupled resonator filters are each connected with one another over a pair of electrically conducting connections.
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