Ladder-type surface acoustic wave filter including series and parallel resonators
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United States of America Patent
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Nov 14, 2017
Grant Date -
Feb 25, 2016
app pub date -
Oct 26, 2015
filing date -
Jun 23, 2011
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Abstract
A ladder-type surface acoustic wave filter assembly includes a plurality of series resonators formed on a substrate and connected between an input terminal and an output terminal. A first series resonator has a lowest resonance frequency among the plurality of series resonator. A parallel resonator formed on the substrate and connected between the plurality of series resonators and the ground terminal. A dielectric film is coupled to at least one of the plurality of series resonators and has an inverse temperature coefficient of frequency to that of the substrate. A film thickness of the dielectric film in a region where the second series resonator is formed is smaller than a film thickness of the dielectric film in a region where the first series resonator is formed.
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