Multiplexer, front-end module, and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorMasakazu Tani
Life of this patent
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Abstract
A multiplexer includes a common terminal, a first reception output terminal, a second reception output terminal, a first filter that is connected between the common terminal and the first reception output terminal, a second filter that is connected between the common terminal and the second reception output terminal and that has a passband different from that of the first filter, and an impedance matching circuit that is disposed between the common terminal and the second filter. The impedance matching circuit includes a serial arm resonator disposed in series on a path connecting the common terminal to the second filter.
Claims12
A multiplexer comprising:
- a first common terminal, a first input/output terminal, and a second input/output terminal;
- a first filter that is connected between the first common terminal and the first input/output terminal;
- a second filter that is connected between the first common terminal and the second input/output terminal, the second filter having a passband that is different than a passband of the first filter;
- and
- an impedance matching circuit that is between the first common terminal and the second filter,
- wherein the impedance matching circuit comprises a first acoustic wave resonator that is in series on a path connecting the first common terminal to the second filter,
- wherein the second filter comprises an acoustic wave resonator, and
- wherein the impedance matching circuit further comprises a first inductor that is between the first common terminal and the first acoustic wave resonator, and that is connected to the first acoustic wave resonator in series.
A multiplexer comprising:
- a first common terminal, a first input/output terminal, and a second input/output terminal;
- a first filter that is connected between the first common terminal and the first input/output terminal;
- a second filter that is connected between the first common terminal and the second input/output terminal, the second terminal having a passband that is different than a passband of the first filter;
- and
- an impedance matching circuit that is between the first common terminal and the second filter,
- wherein the impedance matching circuit comprises a first acoustic wave resonator that is in series on a path connecting the first common terminal to the second filter, and
- wherein the impedance matching circuit further comprises an inductor that is between ground and a node on the path, the node being between the first common terminal and the first acoustic wave resonator.
Dependencies are inferred from the claim text.