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公开(公告)号：US20220368314A1
公开(公告)日：2022-11-17
申请号：US17868815
申请日：2022-07-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yasumasa TANIGUCHI , Ryo NAKAGAWA , Koji NOSAKA
Abstract: When a current flowing in a series circuit including an equivalent resistance, an equivalent inductor, and an equivalent capacitance in an electric equivalent circuit of a specific resonator in each filter is defined as an acoustic path current, under conditions that a phase of an acoustic path current of a first transmission filter at a side of a common terminal at a frequency within a first pass band is represented as θ1Tx1, a phase of an acoustic path current of the first transmission filter at the side of the common terminal at a frequency within a second pass band is represented as θ2Tx1, a phase of an acoustic path current of a second transmission filter at the side of the common terminal at a frequency within the first pass band is represented as θ1Tx2, and a phase of an acoustic path current of the second transmission filter at the side of the common terminal at a frequency within the second pass band is represented as θ2Tx2, a multiplexer satisfies a first condition: |(2·θ1Tx1−θ2Tx1)−(2·θ1Tx2−θ2Tx2)|=180°±90°, or a second condition: |(2·θ2Tx1−θ1Tx1)−(2·θ2Tx2−θ1Tx2)|=180°±90°.
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公开(公告)号：US20200220523A1
公开(公告)日：2020-07-09
申请号：US16824773
申请日：2020-03-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
IPC: H03H9/72 , H03H9/05 , H03H9/64 , H04B1/40 , H03H9/02 , H03H9/00 , H03F3/19 , H03H9/25 , H03H9/145
Abstract: A multiplexer (1) includes a plurality of filters connected to a common terminal (110). The multiplexer (1) includes: a low-frequency filter (11L) that is formed of at least one surface acoustic wave resonator arranged between the common terminal (110) and the input/output terminal (120) and has a first pass band; a high-frequency filter (12H) that is connected between the common terminal (110) and the input/output terminal (130) and has a second pass band located at a higher frequency than the first pass band; and a capacitor (CB1) that is serially arranged in a connection path between the common terminal (110) and the low-frequency filter (11L). The Q value of the capacitor (CB1) in the second pass band is higher than the Q value in the second pass band of a capacitance obtained by treating the at least one surface acoustic wave resonator of the low-frequency filter (11L) as a capacitance.
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3.发明申请公开(公告)号：US20200220522A1
公开(公告)日：2020-07-09
申请号：US16826324
申请日：2020-03-23
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A filter device includes a first input/output terminal and a second input/output terminal, as well as a series-arm circuit disposed on a path that connects the first input/output terminal and the second input/output terminal, and a parallel-arm circuit connected to a node on the path and a ground. At least one of the series-arm circuit or the parallel-arm circuit includes a resonance circuit, and the resonance circuit includes a first acoustic wave resonator, and a first capacitor connected in parallel to the first acoustic wave resonator, and having a greater electrostatic capacitance per unit area than that for the first acoustic wave resonator.
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公开(公告)号：US20190363698A1
公开(公告)日：2019-11-28
申请号：US16527639
申请日：2019-07-31
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A radio-frequency filter (10) includes a series arm circuit (11) and a parallel arm circuit (12). The series arm circuit (11) includes a series arm resonator (s1a) and a variable frequency circuit (11b) connected in parallel with the series arm resonator (s1a). The variable frequency circuit (11b) includes a series arm resonator (s1b) and a switch (SWb) connected in series with the series arm resonator (s1b). The variable frequency circuit (11b) is configured to change at least one of a resonant frequency that provides a pass band of the radio-frequency filter (10) and an anti-resonant frequency that provides an attenuation pole of the radio-frequency filter (10). A resonant frequency of the series arm resonator (s1b) is different from a resonant frequency of the series arm resonator (s1a).
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5.发明申请公开(公告)号：US20190222199A1
公开(公告)日：2019-07-18
申请号：US16367389
申请日：2019-03-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A filter includes a longitudinally coupled resonator device, a parallel arm resonator, and a variable frequency circuit. The parallel arm resonator is connected between a ground and a node provided on a path connecting input-output terminals. The variable frequency circuit is connected to the first parallel arm resonator. The longitudinally coupled resonator device includes three or more odd-number IDT electrodes, an odd-numbered IDT terminal, and an even-numbered IDT terminal. The even-numbered IDT terminal is a first signal terminal connected to at least one IDT electrode located at an even-numbered position from an edge of an arrangement order of the plural IDT electrodes. The odd-numbered IDT terminal is a second signal terminal connected to two or more IDT electrodes located at odd-numbered positions from the edge. The longitudinally coupled resonator device is disposed so that the even-numbered IDT terminal is connected to the node.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20190190496A1
公开(公告)日：2019-06-20
申请号：US16283865
申请日：2019-02-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
CPC classification number: H03H9/6489 , H01Q1/50 , H03H7/01 , H03H9/02637 , H03H9/145 , H03H9/14544 , H03H9/64 , H03H9/6483 , H04B1/40
Abstract: A filter includes a series-arm resonator connected on a path connecting an input/output terminal and an input/output terminal, and first and second parallel-arm resonators connected between the same node on the path and ground. A resonant frequency of the first parallel-arm resonator is lower than a resonant frequency of the second parallel-arm resonator, and an anti-resonant frequency of the first parallel-arm resonator is lower than an anti-resonant frequency of the second parallel-arm resonator. The first parallel-arm resonator is defined by an acoustic wave resonator, and includes an IDT electrode that excites an acoustic wave, and a reflector that reflects the acoustic wave excited by the IDT electrode. A pitch between the IDT electrode and the reflector is about 0.42λ or more and less than about 0.50λ.
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公开(公告)号：US20210143797A1
公开(公告)日：2021-05-13
申请号：US17156039
申请日：2021-01-22
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
IPC: H03H9/72 , H03H9/64 , H03H9/05 , H03H9/145 , H03H9/25 , H03F3/19 , H03H9/00 , H03H9/02 , H04B1/40
Abstract: A multiplexer (1) includes a plurality of filters connected to a common terminal (110). The multiplexer (1) includes: a low-frequency filter (11L) that is formed of at least one surface acoustic wave resonator arranged between the common terminal (110) and the input/output terminal (120) and has a first pass band; a high-frequency filter (12H) that is connected between the common terminal (110) and the input/output terminal (130) and has a second pass band located at a higher frequency than the first pass band; and a capacitor (CB1) that is serially arranged in a connection path between the common terminal (110) and the low-frequency filter (11L). The Q value of the capacitor (CB1) in the second pass band is higher than the Q value in the second pass band of a capacitance obtained by treating the at least one surface acoustic wave resonator of the low-frequency filter (11L) as a capacitance.
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8.发明申请公开(公告)号：US20210013871A1
公开(公告)日：2021-01-14
申请号：US17033949
申请日：2020-09-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A multiplexer includes a first filter located between a common terminal and a first terminal to pass a signal in a first passband, and a second filter located between the common terminal and a second terminal to pass a signal in a second passband. A first series arm circuit included in the first filter includes a first series arm resonator and a second series arm resonator. The first series arm circuit is connected to the common terminal not through a circuit including an elastic wave resonator and a connecting point of the circuit. The first series arm circuit has a first antiresonance frequency and a second antiresonance frequency higher than the first antiresonance frequency. The second antiresonance frequency is higher than a higher edge of the first passband. The first antiresonance frequency is at or lower than a higher edge of the second passband.
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9.发明申请公开(公告)号：US20200153412A1
公开(公告)日：2020-05-14
申请号：US16746996
申请日：2020-01-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A radio frequency (RF) filter having a first passband and including a first circuit connected to a first node and a second node disposed on a path that connects a first terminal and a second terminal, and a second circuit connected to the first node and the second node. The first circuit includes a first filter having a second passband that includes a portion of a frequency range of the first passband and a bandwidth narrower than a bandwidth of the first passband. The second circuit includes a second filter having a third passband that includes a portion of a frequency range of the first passband and has a bandwidth narrower than the bandwidth of the first passband. The RF filter also includes a first phase shifter connected to a first terminal of the second filter; and a second phase shifter connected to a second terminal of the second filter.
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10.发明申请公开(公告)号：US20190267970A1
公开(公告)日：2019-08-29
申请号：US16412491
申请日：2019-05-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: An acoustic wave filter includes series arm resonators, and a parallel arm resonator provided in a second path connecting a ground and a node connecting the series arm resonators. Each of the series arm resonators includes a piezoelectric body and an interdigital transducer electrode. One of the series arm resonators includes a second adjusting film that adjusts Ksaw. An anti-resonant frequency of the other one of the series arm resonators is higher than an anti-resonant frequency of the one of series arm resonators. An adjusting film that adjusts Ksaw is not provided in the other one of series arm resonators, or when a first adjusting film that adjusts Ksaw is provided in the other one of the series arm resonators, the first adjusting film is thinner than the second adjusting film.
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