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US 10,833,651 B2Granted
Multiplexer, radio-frequency front end circuit, and communication apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorKoji Nosaka
Life of this patent
Estimating the term…
Abstract
A multiplexer includes a common terminal, a first terminal, a second terminal, and a third terminal, a first filter, a second filter, and a third filter. With a frequency f3 being defined as M×f1±N×f2 or M×f2±N×f1, M and N being natural numbers, f1 being a frequency included in a first passband of the first filter and f2 being a frequency included in a second passband of the second filter, at least a part of a range of frequency f3 overlaps a third passband of the third filter. No acoustic wave resonator is connected between the common terminal and a first parallel arm resonance circuit. A combined capacitance of the first parallel arm resonance circuit is higher than a minimum value of a combined capacitance of each of at least one first serial arm resonance circuit.
Claims19
A multiplexer comprising:
- a common terminal, a first terminal, a second terminal, and a third terminal;
- a first filter connected between the common terminal and the first terminal, the first filter having a first passband;
- a second filter connected between the common terminal and the second terminal, the second filter having a second passband not overlapping the first passband;
- and
- a third filter connected between the common terminal and the third terminal, the third filter having a third passband overlapping neither the first passband nor the second passband,
- with a frequency f3 being defined as M×f1±N×f2 or M×f2±N×f1, M and N being natural numbers, f1 being a frequency included in the first passband and f2 being a frequency included in the second passband, at least a part of a range of the frequency f3 overlapping the third passband,
- the first filter including
- at least one first serial arm resonance circuit connected between the common terminal and the first terminal, and
- a first parallel arm resonance circuit connected between the common terminal and a grounding point, the first parallel arm resonance circuit including at least one acoustic wave resonator,
- no acoustic wave resonator being connected between the common terminal and the first parallel arm resonance circuit, and
- a combined capacitance of the first parallel arm resonance circuit being higher than a minimum value of a combined capacitance of each of the at least one first serial arm resonance circuit.
8 more elements
A radio-frequency front end circuit comprising:
- a multiplexer including
- a common terminal, a first terminal, a second terminal, and a third terminal,
- a first filter connected between the common terminal and the first terminal, the first filter having a first passband,
- a second filter connected between the common terminal and the second terminal, the second filter having a second passband not overlapping the first passband, and
- a third filter connected between the common terminal and the third terminal, the third filter having a third passband overlapping neither the first passband nor the second passband,
- with a frequency f3 being defined as M×f1±N×f2 or M×f2±N×f1, M and N being natural numbers, f1 being a frequency included in the first passband and f2 being a frequency included in the second passband, at least a part of a range of the frequency f3 overlapping the third passband,
- the first filter including
- at least one first serial arm resonance circuit connected between the common terminal and the first terminal, and
- a first parallel arm resonance circuit connected between the common terminal and a grounding point, the first parallel arm resonance circuit including at least one acoustic wave resonator,
- no acoustic wave resonator being connected between the common terminal and the first parallel arm resonance circuit, and
- a combined capacitance of the first parallel arm resonance circuit being higher than a minimum value of a combined capacitance of each of the at least one first serial arm resonance circuit;
- and
- an amplification circuit electrically connected to the multiplexer.
10 more elements
A communication apparatus comprising:
- an antenna element;
- an RF signal processing circuit that processes a radio-frequency signal transmitted and received by the antenna element;
- and
- a radio-frequency front end circuit that transmits the radio-frequency signal between the antenna element and the RF signal processing circuit, the radio-frequency front end circuit including
- a multiplexer including
- a common terminal, a first terminal, a second terminal, and a third terminal,
- a first filter connected between the common terminal and the first terminal, the first filter having a first passband,
- a second filter connected between the common terminal and the second terminal, the second filter having a second passband not overlapping the first passband, and
- a third filter connected between the common terminal and the third terminal, the third filter having a third passband overlapping neither the first passband nor the second passband,
- with a frequency f3 being defined as M×f1±N×f2 or M×f2±N×f1, M and N being natural numbers, f1 being a frequency included in the first passband and f2 being a frequency included in the second passband, at least a part of a range of the frequency f3 overlapping the third passband,
- the first filter including
- at least one first serial arm resonance circuit connected between the common terminal and the first terminal, and
- a first parallel arm resonance circuit connected between the common terminal and a grounding point, the first parallel arm resonance circuit including at least one acoustic wave resonator,
- no acoustic wave resonator being connected between the common terminal and the first parallel arm resonance circuit, and
- a combined capacitance of the first parallel arm resonance circuit being higher than a minimum value of a combined capacitance of each of the at least one first serial arm resonance circuit, and
- an amplification circuit electrically connected to the multiplexer.
13 more elements
Dependencies are inferred from the claim text.