Saw resonator having transverse mode ripple at antiresonance point
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United States of America Patent
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Jan 13, 1998
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N/A
app pub date -
Mar 1, 1996
filing date -
Mar 3, 1995
priority date (Note) -
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Abstract
A SAW resonator for forming a frequency trap has a surface wave substrate and at least one interdigital transducer located on the surface wave substrate. The interdigital transducer includes a pair of comb-shaped electrodes each having a plurality of electrode fingers arranged so that the pair of comb-shaped electrodes interdigitates with each other. An overlapping width of the electrode fingers of the interdigital transducer is set such that in an impedance-frequency characteristic a transverse mode ripple occurring between a resonance point and an antiresonance point is located at the antiresonance point.
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