FILTER, BRANCHING FILTER, AND COMMUNICATION APPARATUS

摘要

The present invention comprises: an input unit; an output unit; and a plurality of serial resonators and a plurality of parallel resonators that comprise IDT electrodes and are connected in a ladder-type between the input unit and the output unit; wherein the plurality of parallel resonators comprises at least one first parallel resonator that has a resonance frequency lower than the resonance frequency of the plurality of serial resonators and at least one second parallel resonator that has a resonance frequency higher than the antiresonance frequency of the plurality of serial resonators.