Acoustic wave filter
AssigneeMurata Manufacturing Co., Ltd.
InventorAkira Noguchi
Life of this patent
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Abstract
An acoustic wave filter includes a filter circuit connected to input-and-output terminals, and a canceling circuit connected in parallel to at least a portion of a first path connecting the input-and-output terminals. The filter circuit includes one or more series-arm resonators on the first path, and one or more parallel-arm resonators between the first path and a ground. The canceling circuit includes acoustic wave resonators in parallel or substantially in parallel in a propagation direction of an acoustic wave. At least one of the acoustic wave resonators is connected to the ground, and an anti-resonant frequency of the at least one of the acoustic wave resonators is in a pass band of the filter circuit.
Claims20
An acoustic wave filter comprising:
- a first circuit connected to a first terminal and a second terminal;
- and
- a second circuit connected in parallel to at least a portion of a first path connecting the first terminal and the second terminal;
- wherein
- the first circuit includes:
- one or more series-arm resonators on the first path;
- and
- one or more parallel-arm resonators between the first path and a ground;
- the second circuit includes a plurality of first acoustic wave resonators in parallel or substantially in parallel in a propagation direction of an acoustic wave;
- at least one of the plurality of first acoustic wave resonators is connected to a ground;
- and
- an anti-resonant frequency of the at least one of the plurality of first acoustic wave resonators is in a pass band of the first circuit.
Dependencies are inferred from the claim text.