Multiplexer, transmission device, reception device, high-frequency front end circuit, communication device and impedance matching method for multiplexer
AssigneeMurata Manufacturing Co., Ltd.
InventorYuichi Takamine
Life of this patent
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Abstract
A multiplexer includes elastic wave filters with different pass bands, a common terminal to which an inductance element is serially connected in a connection path between an antenna element and the common terminal; and an inductance element. Among the elastic wave filters, a reception input terminal of a first reception filter is connected to the common terminal via the inductance element and is connected to a parallel resonator. Transmission output terminals of transmission filters and a reception input terminal of a second reception filter are connected to the common terminal, are connected to series resonators, and are not connected to parallel resonators.
Claims15
A multiplexer that transmits and receives a plurality of high-frequency signals via an antenna element, the multiplexer comprising:
- a plurality of elastic wave filters that have different pass bands from each other;
- a common terminal to which a first inductance element is serially connected in a connection path between the antenna element and the common terminal;
- and
- a second inductance element;
- wherein
- each of the plurality of elastic wave filters includes at least one series resonator that is connected between an input terminal and an output terminal of the respective elastic wave filter and at least one parallel resonator that is connected between a connection path, which connects the input terminal and the output terminal, and a reference terminal;
- an antenna-element-side terminal among the input terminal and the output terminal of one elastic wave filter among the plurality of elastic wave filters is connected to the common terminal via the second inductance element, which is connected to the antenna-element-side terminal and the common terminal, and is connected to the at least one parallel resonator;
- and
- antenna-element-side terminals among the input terminals and the output terminals of the plurality of elastic wave filters other than the one elastic wave filter are connected to the common terminal, and are each connected to the at least one series resonator.
A device that transmits and receives a plurality of high-frequency signals via an antenna element, the device comprising:
- a plurality of elastic wave filters that have different pass bands from each other;
- a common terminal to which a first inductance element is serially connected in a connection path between the antenna element and the common terminal;
- and
- a second inductance element;
- wherein
- each of the plurality of elastic wave filters includes at least one series resonator that is connected between an input terminal and an output terminal of the respective elastic wave filter and at least one parallel resonator that is connected between a connection path, which connects the input terminal and the output terminal, and a reference terminal;
- an antenna-element-side terminal among the input terminal and the output terminal of one elastic wave filter among the plurality of elastic wave filters is connected to the common terminal via the second inductance element, which is connected to the antenna-element-side terminal and the common terminal, and is connected to the at least one parallel resonator;
- and
- antenna-element-side terminals among the input terminals and the output terminals of the plurality of elastic wave filters other than the one elastic wave filter are connected to the common terminal, and are each connected to the at least one series resonator.
Dependencies are inferred from the claim text.