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公开(公告)号：US20170272055A1
公开(公告)日：2017-09-21
申请号：US15617355
申请日：2017-06-08
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Manabu NAKAHORI , Masakazu TANI
CPC classification number: H03H9/542 , H03H7/0153 , H03H9/605 , H03H9/6403 , H03H9/6483 , H03H2210/012 , H03H2210/025
Abstract: A variable filter circuit includes: a series arm connected in series between a signal input terminal and a signal output terminal; a parallel arm connected between the series arm and a ground terminal that has a resonator; and a variable reactance portion in the parallel arm, and the resonator of a parallel arm at an initial stage connected to the signal input terminal that has a resonant frequency fr and an anti-resonant frequency fa that satisfy 100×(fn−fr)/(fa−fr)≦23.9(%) for communication bands for each of which a stop band is set so as to be close to a high-frequency side of a pass band, among the plurality of communication bands, where a resonant frequency is fr, an anti-resonant frequency is fa, and a cutoff frequency at a high-frequency side of a pass band of each communication band is fn.
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公开(公告)号：US20220302899A1
公开(公告)日：2022-09-22
申请号：US17117587
申请日：2020-12-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hirotsugu MORI , Masakazu TANI
Abstract: A multiplexer (1) includes: a filter (13L) that is arranged between a common terminal (100) and an input/output terminal (130) and that has a first pass band; a filter (12H) that is arranged between the common terminal (100) and an input/output terminal (120), that is formed of at least one acoustic wave resonator, and that has a second pass band located at a higher frequency than the first pass band; and a capacitor (C2) that is serially arranged on a connection path between the common terminal (100) and the filter (12H). When the filter (12H) is regarded as a capacitance, the Q value of the capacitor (C2) in the first pass band is higher than the Q value of the capacitance in the first pass band.
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公开(公告)号：US20220263535A1
公开(公告)日：2022-08-18
申请号：US17661771
申请日：2022-05-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI
IPC: H04B1/40
Abstract: In a radio-frequency circuit, a first switch is connected to an antenna terminal. A second switch is connected to the first switch and is connected to the antenna terminal via the first switch. A first filter is connected to the first switch without having the second switch interposed therebetween and allows a radio-frequency signal of a first communication band to pass through the first filter. A second filter is connected to the first switch via the second switch and allows a radio-frequency signal of a second communication band to pass through the second filter. The second communication band is higher than the first communication band. The radio-frequency circuit further includes an inductor. The inductor is not connected in series with the first filter and is connected in series with the first switch and the second switch between the first switch and the second switch.
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公开(公告)号：US20210359665A1
公开(公告)日：2021-11-18
申请号：US17390016
申请日：2021-07-30
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI
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.
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公开(公告)号：US20220263534A1
公开(公告)日：2022-08-18
申请号：US17661587
申请日：2022-05-02
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI
IPC: H04B1/40
Abstract: In a radio-frequency circuit, a first switch is connected to an antenna terminal. A second switch is connected to the antenna terminal via the first switch. A first filter is an acoustic wave filter that is connected to the first switch via the second switch and that allows a radio-frequency signal of a first communication band to pass through the first filter. A second filter is an acoustic wave filter that is connected to the first switch without necessarily having the second switch interposed therebetween and that allows a radio-frequency signal of a second communication band to pass through the second filter. The second communication band is higher than the first communication band. The radio-frequency circuit further includes a capacitor. The capacitor is connected in series with the first switch and the second switch between the first switch and the second switch.
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Patent Agency Ranking
公开(公告)号：US20220021407A1
公开(公告)日：2022-01-20
申请号：US17376167
申请日：2021-07-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Shigeru TSUCHIDA , Hiroki SHONAI , Masakazu TANI , Yukiya YAMAGUCHI , Morio TAKEUCHI
Abstract: A radio-frequency module includes a mounting substrate having a first main surface; a first power amplifier that is mounted on the first main surface and that amplifies a first transmission signal in a first frequency band; a second power amplifier that is mounted on the first main surface and that amplifies a second transmission signal in a second frequency band different from the first frequency band; a first output matching circuit that is mounted on the first main surface and that receives the first transmission signal amplified by the first power amplifier; and a second output matching circuit that is mounted on the first main surface and that receives the second transmission signal amplified by the second power amplifier. The first output matching circuit and the second output matching circuit are mounted along a second direction intersecting with the first direction.
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公开(公告)号：US20160204763A1
公开(公告)日：2016-07-14
申请号：US15079287
申请日：2016-03-24
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI
CPC classification number: H03H9/542 , H03H5/12 , H03H9/568 , H03H9/64 , H03H9/6403 , H03H9/6483 , H03H2009/02165
Abstract: A resonant circuit includes a resonator. An inductor is connected in parallel with the resonator. An inductor is connected in series with the parallel circuit formed of the resonator and the inductor. Further, a variable capacitor is connected in parallel with a series circuit formed of the inductor and the parallel circuit formed of the resonator and the inductor. The variable capacitor is connected in series with these circuits. As a result, a resonant circuit and a high-frequency filter supporting more communication signals are provided.
Abstract translation: 谐振电路包括谐振器。 电感器与谐振器并联连接。 电感器与由谐振器和电感器形成的并联电路串联连接。 此外，可变电容器与由电感器和由谐振器和电感器形成的并联电路形成的串联电路并联连接。 可变电容器与这些电路串联连接。 结果，提供了一种支持更多通信信号的谐振电路和高频滤波器。
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8.发明申请公开(公告)号：US20190149130A1
公开(公告)日：2019-05-16
申请号：US16244379
申请日：2019-01-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI
Abstract: Even when frequency characteristics are changed in association with multiple communication bands, an attenuation required for a specific frequency band outside a pass band is obtained. A frequency-variable filter (10) includes multiple series-arm resonators (111, 112, 113), multiple parallel-arm resonators (121, 122, 123), a variable capacitor (21), and an inductor (31) having a fixed inductance. The multiple series-arm resonators (111, 112, 113) and the multiple parallel-arm resonators (121, 122, 123) are connected in a ladder shape. The variable capacitor (21) is connected in series with the parallel-arm resonator (121). The fixed inductor (31) is connected in series with the parallel-arm resonator (123).
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公开(公告)号：US20190149121A1
公开(公告)日：2019-05-16
申请号：US16246822
申请日：2019-01-14
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI
CPC classification number: H03H7/465 , H03F3/189 , H03F3/24 , H03F3/68 , H03F2200/165 , H03F2200/171 , H03F2200/294 , H03F2200/451 , H03H7/0115 , H03H7/075 , H03H7/38 , H03H9/542 , H03H9/706 , H03H9/725 , H04B1/40 , H04B1/52
Abstract: Even when frequency characteristics are changed in association with multiple communication bands, an attenuation required for a specific frequency band outside a pass band is obtained. A multiplexer includes a transmission filter, a reception filter, and a common connection point. An antenna-side end of the transmission filter and an antenna-side end of the reception filter are connected to the common connection point. The transmission filter includes multiple resonators including a parallel-arm resonator and a variable capacitor that is connected in series with the parallel-arm resonator. An inductor for forming an attenuation pole is provided between the antenna-side end of the reception filter and the common connection point. By the inductor for forming an attenuation pole and the reception filter, which is capacitive, an attenuation pole at a frequency close to or equal to a specific frequency outside the pass band of a transmission signal is formed.
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公开(公告)号：US20160344370A1
公开(公告)日：2016-11-24
申请号：US15230666
申请日：2016-08-08
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masakazu TANI , Shouzo SUGIYAMA
CPC classification number: H03H9/64 , H03H7/0161 , H03H7/075 , H03H9/542 , H04B1/0064
Abstract: A variable filter circuit includes a serial arm connected between ports (P1-P2), a parallel arm having a resonator connected in series between ports (P1-P3), and another parallel arm having another resonator connected in series between ports (P2-P3). The serial arm includes an inductor connected between the ports (P1-P2), and the parallel arms include variable capacitances connected in series to the resonators.
Abstract translation: 可变滤波器电路包括连接在端口（P1-P2）之间的串联臂，具有在端口（P1-P3）之间串联连接的谐振器的并联臂，以及具有在端口（P2-P3）之间串联连接的另一谐振器的另一个并联臂 ）。 串联臂包括连接在端口（P1-P2）之间的电感器，并联臂包括与谐振器串联连接的可变电容。
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