Elastic wave filters and duplexers using same
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United States of America Patent
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May 2, 2017
Issued Date -
N/A
app pub date -
Jul 27, 2015
filing date -
Jul 31, 2014
priority date (Note) -
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Abstract
An elastic wave filter including a substrate, a signal line disposed on the substrate and connecting a first signal terminal to a second signal terminal, a plurality of series resonators connected to the signal line in series, and a plurality of parallel resonators connected to the signal line. At least one of the series resonator having an anti-resonant frequency closest to the passband of the filter among the plurality of series resonators, and/or the parallel resonator having a resonant frequency closest to the passband of the filter among the plurality of parallel resonators, is covered with a dielectric film that is relatively thicker than a dielectric film covering the other series and/or parallel resonators.
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