Band pass filter and duplexer
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United States of America Patent
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Jun 12, 2018
Issued Date -
N/A
app pub date -
Oct 11, 2016
filing date -
Oct 26, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A band pass filter includes a longitudinally coupled resonator elastic wave filter on a piezoelectric substrate and parallel arm resonators at parallel arms, each connected between a series arm connecting an antenna terminal and a receiving terminal and one of ground terminals. The parallel arm resonators include a first parallel arm resonator having the highest resonance frequency among the parallel arm resonators and a second parallel arm resonator. A second ground terminal that is one of the ground terminals connected to the second parallel arm resonator and a third ground terminal that is one of the ground terminals connected to the longitudinally coupled resonator elastic wave filter are connected to each other. A first ground terminal that is one of the ground terminals connected to the first parallel arm resonator is not connected to the second or third ground terminals.
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