Filter, multiplexer, and communication apparatus
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United States of America Patent
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Jul 30, 2019
Grant Date -
Jan 25, 2018
app pub date -
Jan 27, 2016
filing date -
Jan 27, 2015
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Abstract
An input port, an output port, and a plurality of serial resonators and a plurality of parallel resonators connected in a ladder type between the input port and the output port and including IDT electrodes are provided. The plurality of parallel resonators include at least one first parallel resonator having a resonance frequency lower than resonance frequencies of the plurality of serial resonators, and at least one second parallel resonator having a resonance frequency higher than antiresonance frequencies of the plurality of serial resonators.
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