Filter device
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United States of America Patent
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Oct 22, 2019
Grant Date -
Oct 12, 2017
app pub date -
Jun 23, 2017
filing date -
Jan 7, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A composite filter device includes a first filter and a plurality of second filters with different passbands. End portions of the first filter and the plurality of second filters are connected to a common connection. The first filter includes a piezoelectric substrate made of LiNbO3, an IDT electrode provided on the piezoelectric substrate, and a dielectric layer provided on the piezoelectric substrate so as to cover the IDT electrode. The first filter utilizes a fundamental wave of Rayleigh waves. The passband of the first filter is arranged in a frequency band that is lower than any of the passbands of the plurality of second filters.
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