Acoustic wave filter device and duplexer
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United States of America Patent
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May 12, 2009
Grant Date -
Oct 11, 2007
app pub date -
Jun 15, 2007
filing date -
Oct 3, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In an acoustic wave filter device, first and second longitudinally coupled resonator SAW filters are provided on a piezoelectric substrate. The first and second longitudinally coupled resonator SAW filters are connected in parallel to each other. The first and second longitudinally coupled resonator SAW filters are withdrawal-weighted. The withdrawal weighting in at least the longitudinally coupled resonator SAW filter is different from the withdrawal weighting in the other longitudinally coupled resonator SAW filter.
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