Ladder filter and duplexer
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United States of America Patent
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Mar 19, 2019
Grant Date -
Jan 11, 2018
app pub date -
Sep 21, 2017
filing date -
Apr 30, 2015
priority date (Note) -
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Abstract
A ladder filter in which the pass band is defined by serial arm resonators and first and second parallel arm resonators includes the serial arm resonators, the first and second parallel arm resonators, and a third parallel arm resonator. The third parallel arm resonator is connected in parallel to the first parallel arm resonator, the electrostatic capacitance of the third parallel arm resonator is smaller than that of the first parallel arm resonator, and the anti-resonant frequency of the third parallel arm resonator is positioned outside the pass band of the ladder filter. The anti-resonant frequency of the first parallel arm resonator is positioned at the high frequency side of the anti-resonant frequencies of the second parallel arm resonators.
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