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Surface acoustic wave filter and surface acoustic wave duplexer having the same
Surface acoustic wave filter and surface acoustic wave duplexer having the same
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机译:表面声波滤波器和具有该表面声波滤波器的表面声波双工器
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摘要
A surface acoustic wave filter includes a series-arm resonators and parallel-arm resonators that are connected in a ladder-like structure, each having an interdigital transducer formed on a piezoelectric substrate, and at least one of the series-arm resonators having a different static capacitance from the other series-arm resonators. In this surface acoustic wave filter, at least one of the series-arm resonators except the series-arm resonator located at the first stage in the ladder-like structure has a lower average resonant frequency than the other series-arm resonators.
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