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31.发明申请公开(公告)号：US20190158062A1
公开(公告)日：2019-05-23
申请号：US16251257
申请日：2019-01-18
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Atsushi HORITA , Koji NOSAKA
CPC classification number: H03H9/6483 , H03H7/0161 , H03H7/075 , H03H9/605 , H03H9/6403 , H04B1/0057 , H04B1/40
Abstract: A filter (11) includes a series-arm circuit (10) connected between an input/output terminal (11m) and an input/output terminal (11n); and a parallel-arm circuit (20) connected between a ground and a path that connects the input/output terminal (11m) and the input/output terminal (11n). One circuit among the series-arm circuit (10) and the parallel-arm circuit (20) is constituted by a parallel-arm resonator (p1) and a parallel-arm resonator (p2) that are connected in parallel to each other and that are connected to a node (x1) on the path. The parallel-arm resonators (p1) and (p2) form a pass band, together with another circuit among the series-arm circuit (10) and the parallel-arm circuit (20). The parallel-arm resonator (p2) has a resonant frequency lower than a resonant frequency of the parallel-arm resonator (p1) and has an impedance higher than an impedance of the parallel-arm resonator (p1).
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公开(公告)号：US20190123722A1
公开(公告)日：2019-04-25
申请号：US16217254
申请日：2018-12-12
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
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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33.发明申请公开(公告)号：US20190089323A1
公开(公告)日：2019-03-21
申请号：US16192195
申请日：2018-11-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: An impedance matching circuit (31) includes inductors (311L and 312L) that are connected in series, a switch (311S) that includes a first terminal connected to an end of the inductor (311L) and a second terminal and that switches between connection and disconnection between the first terminal and the second terminal, a switch (312S) that includes a third terminal connected to a connection point of the other end of the inductor (311L) and an end of the inductor (312L) and a fourth terminal and that switches between connection and disconnection between the third terminal and the fourth terminal, a switch (313S) that includes a fifth terminal connected to the other end of the inductor (312L) and a sixth terminal and that switches between connection and disconnection between the fifth terminal and the sixth terminal. The second terminal, the fourth terminal, and the sixth terminal are connected to each other.
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34.发明申请公开(公告)号：US20190081613A1
公开(公告)日：2019-03-14
申请号：US16186839
申请日：2018-11-12
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
CPC classification number: H03H9/64 , H03F3/19 , H03F3/195 , H03F3/68 , H03F2200/111 , H03F2200/249 , H03F2200/417 , H03F2200/421 , H03F2200/451 , H03H7/075 , H03H7/461 , H03H9/14541 , H03H9/542 , H03H9/6403 , H03H9/703 , H03H9/72 , H03H2210/012 , H03H2210/036 , H03H2250/00 , H04B1/38 , H04B1/40 , H04B1/525
Abstract: A filter includes a series arm circuit connected between an input-output terminal and an input-output terminal and a parallel arm circuit connected between a ground and a node. The parallel arm circuit includes a first circuit and a second circuit. The first circuit has a parallel arm resonator. The second circuit is connected in parallel with the first circuit and has a parallel arm resonator. At least one of the first and second circuits includes a variable frequency circuit. The variable frequency circuit is connected in series with the parallel arm resonator or the parallel arm resonator included in the corresponding one of the first and second circuits. The variable frequency circuit has an impedance element and a switch connected in parallel with each other. The parallel arm resonator has a resonant frequency different from the parallel arm resonator and an anti-resonant frequency different from the parallel arm resonator.
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公开(公告)号：US20140368401A1
公开(公告)日：2014-12-18
申请号：US14475724
申请日：2014-09-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takashi MIYAKE , Koji NOSAKA , Ryo NAKAGAWA , Haruki KYOUYA
CPC classification number: H03H9/725 , H01Q1/50 , H03H9/0038 , H03H9/14576 , H03H9/542 , H03H9/703 , H03H9/706 , H03H9/72 , H04B1/50 , H04B1/525 , H04L5/14
Abstract: A communication device is provided with a band elimination filter that has one end connected to an antenna terminal, and a first multiplexer that is connected to the other end of the band elimination filter. The band elimination filter is configured to eliminate signals of a frequency band that is different from the frequencies of signals transmitted and received in the first multiplexer, and is configured from a filter circuit that includes a bulk wave element.
Abstract translation: 通信装置设置有一端连接到天线端子的带除滤波器，以及与带除滤波器的另一端连接的第一多路复用器。 带除滤波器被配置为消除与第一多路复用器中发送和接收的信号的频率不同的频带的信号，并且由包括体波元件的滤波器电路配置。
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Patent Agency Ranking
公开(公告)号：US20240088861A1
公开(公告)日：2024-03-14
申请号：US18507182
申请日：2023-11-13
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
IPC: H03H7/38 , H03K17/693 , H04B1/40
CPC classification number: H03H7/38 , H03K17/693 , H04B1/40
Abstract: A switch device includes a common terminal, a switch circuit configured to switch between states of conduction between terminals, a switch circuit configured to switch between states of conduction between terminals, and a switch circuit configured to switch between states of conduction between at least one of terminals and a terminal. Switch elements are provided which are disposed on a path connecting the terminals, a path connecting the terminals, a path connecting the terminal and one of the terminals, and a path connecting the terminal and the other one of the terminals, respectively. The above switch element is formed of one or more stacked semiconductor elements, and the number of stacks of the semiconductor elements in the switch element is smaller than that in the switch element.
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37.发明申请公开(公告)号：US20200235720A1
公开(公告)日：2020-07-23
申请号：US16843897
申请日：2020-04-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: An acoustic wave filter includes: a series-arm resonator disposed on a path that connects input/output terminals; and a parallel-arm circuit connected to a node on the path and a ground. The parallel-arm circuit includes a parallel-arm resonator and a capacitor connected in parallel to each other. The capacitor includes a comb-shaped electrode that includes electrode fingers. A frequency at which impedance of the capacitor has a local maximum value is located outside a passband of the acoustic wave filter. The comb-shaped electrode has at least two different electrode finger pitches or at least two different electrode finger duty ratios.
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38.发明申请公开(公告)号：US20190393861A1
公开(公告)日：2019-12-26
申请号：US16553315
申请日：2019-08-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A filter (10) includes a series arm circuit (11) and a parallel arm circuit (12). The parallel arm circuit (12) includes a parallel arm resonator (p1), a variable frequency circuit (12T), and a parallel arm resonator (p2) connected in parallel with a circuit in which the parallel arm resonator (p1) and the variable frequency circuit (12T) are connected in series. The variable frequency circuit (12T) includes a parallel arm resonator (p3) and a switch (SW) connected in parallel with the parallel arm resonator (p3), and is configured to change frequencies of a pass band and a frequency of an attenuation pole by switching between an on state and off state of the switch (SW). A resonant frequency and anti-resonant frequency of the parallel arm resonator (p1) are respectively different from a resonant frequency and anti-resonant frequency of the parallel arm resonator (p2).
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39.发明申请公开(公告)号：US20190341909A1
公开(公告)日：2019-11-07
申请号：US16515454
申请日：2019-07-18
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koji NOSAKA
Abstract: A radio-frequency filter (10) includes a series arm resonator (s1) connected between input/output terminals (11m and 11n) and parallel arm circuits (110 and 120) connected to a node (x1) and a ground. The parallel arm circuit (110) includes a parallel arm resonator (p1) and a variable frequency circuit (110A) connected in series with each other between the node (x1) and a ground. The variable frequency circuit (110A) changes the resonant frequency of the parallel arm circuit (110). The variable frequency circuit (110A) is connected in series with the parallel arm resonator (p1) and includes a capacitor (C1) and a switch (SW1) connected in parallel with each other. The parallel arm circuit (120) includes a capacitor (C2) and a switch (SW2) connected in series with each other between the node (x1) and a ground.
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公开(公告)号：US20190280669A1
公开(公告)日：2019-09-12
申请号：US16425149
申请日：2019-05-29
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hirotsugu MORI , Koji NOSAKA
Abstract: A filter includes a first resonant circuit having one or more first resonant frequencies, a second resonant circuit having one or more second resonant frequencies different from the first resonant frequency, and a switch connected to the first resonant circuit and the second resonant circuit. The switch switches between a first state in which a radio-frequency signal of the first resonant frequency flows from an IN terminal to an OUT terminal via the first resonant circuit and a radio-frequency signal of the second resonant frequency flows from the IN terminal to ground via the second resonant circuit and a second state in which a radio-frequency signal of the first resonant frequency flows from the IN terminal to ground via the first resonant circuit and a radio-frequency signal of the second resonant frequency flows from the IN terminal to the OUT terminal via the second resonant circuit.
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