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公开(公告)号：US20230208468A1
公开(公告)日：2023-06-29
申请号：US18176602
申请日：2023-03-01
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA , Kazuhiro IKARASHI , Shunji YOSHIMI
IPC: H04B1/401
CPC classification number: H04B1/401
Abstract: Isolation between a first path and a second path is improved. A radio frequency module is capable of operating in a first mode in which simultaneous transmission, simultaneous reception, or simultaneous transmission and reception using both a first filter and a second filter is possible, and in a second mode in which transmission or reception using only the first filter is possible. A first switching element is provided in a first path that is usable between an antenna terminal and the first filter in the first mode, and a second switching element is provided between the first path and a ground. A third switching element is provided in a second path that is usable between the antenna terminal and the first filter in the second mode, and a fourth switching element is provided between the second path and the ground. The radio frequency module further includes a phase shifter.
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公开(公告)号：US20170373364A1
公开(公告)日：2017-12-28
申请号：US15686281
申请日：2017-08-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA
CPC classification number: H01P1/383 , H01P1/32 , H01P1/387 , H01Q1/2225 , H01Q7/06 , H04B5/0081
Abstract: A circulator includes: a ferrite plate; a permanent magnet that applies a direct current (DC) magnetic field to the ferrite plate; a first coil, a second coil, and a third coil arranged on the ferrite plate while being insulated from one another, the first coil, the second coil, and the third coil having coil axes intersecting one another; a first port that is electrically continuous with the first coil; a second port that is electrically continuous with the second coil; and a third port that is electrically continuous with the third coil. An inductance of the first coil or the second coil is different from an inductance of the third coil, and an impedance of the first port or the second port is not 50Ω.
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公开(公告)号：US20160344100A1
公开(公告)日：2016-11-24
申请号：US15160294
申请日：2016-05-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kengo ONAKA , Hiroya TANAKA , Hidenori OBIYA , Yuki NAKAIKE , Reiji NAKAJIMA
Abstract: A front end circuit and a wireless communication device capable of achieving matching with an antenna across a wide frequency band and capable of suppressing degradation in high-frequency characteristics caused by the influence of transmission signal harmonics is provided. A front end circuit includes a variable matching circuit connected to a low-frequency band transmission port side of a diplexer and a harmonic filter connected between the variable matching circuit and the diplexer. The harmonic filter has a pass band that overlaps with a low-frequency band-side communication band and a stop band that overlaps with a harmonic frequency of the low-frequency band-side communication band.
Abstract translation: 提供了能够实现与宽频带的天线匹配并且能够抑制由发送信号谐波的影响引起的高频特性的劣化的前端电路和无线通信装置。 前端电路包括连接到双工器的低频带传输端口侧的可变匹配电路和连接在可变匹配电路和双工器之间的谐波滤波器。 谐波滤波器具有与低频带侧通信频带和与低频带侧通信频带的谐波频率重叠的阻带重叠的通带。
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公开(公告)号：US20160173056A1
公开(公告)日：2016-06-16
申请号：US15018926
申请日：2016-02-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kazutaka MUKAIYAMA , Kenji SAITO , Takaya WADA , Reiji NAKAJIMA , Shingo YANAGIHARA
IPC: H03H7/52 , H04B1/3827 , H04B1/04
CPC classification number: H03H7/52 , H01P1/36 , H04B1/04 , H04B1/3827
Abstract: An isolator includes a core isolator, a main substrate and a circuit-defining section. The main substrate includes a first wiring portion, a second wiring portion and a third wiring portion and has the core isolator and the circuit-defining section mounted thereon. An input port of the core isolator is connected to the first wiring portion. An output port of the core isolator is connected to the second wiring portion. A ground port of the core isolator is connected to the third wiring portion. In the circuit-defining section, a conductor pattern includes a capacitor that is connected in parallel with the core isolator via the first wiring portion and the second wiring portion, and an impedance element that is connected to at least either of the first wiring portion and the second wiring portion.
Abstract translation: 隔离器包括芯隔离器，主基板和电路限定部分。 主基板包括第一布线部分，第二布线部分和第三布线部分，并且其上安装有芯隔离器和电路限定部分。 芯隔离器的输入端口连接到第一布线部分。 芯隔离器的输出端口连接到第二布线部分。 芯隔离器的接地端口连接到第三布线部分。 在电路定义部分中，导体图案包括经由第一布线部分和第二布线部分与芯隔离器并联连接的电容器，以及阻抗元件，其连接到第一布线部分和第二布线部分中的至少一个， 第二配线部。
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公开(公告)号：US20220376716A1
公开(公告)日：2022-11-24
申请号：US17881606
申请日：2022-08-05
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA
IPC: H04B1/04
Abstract: A radio-frequency module includes a module substrate; a power amplifier; a first switch connected to an input terminal of the power amplifier; a second switch connected to an output terminal of the power amplifier; and a switch control circuit that controls the first switch and the second switch. The first switch, the second switch, and the switch control circuit are included in a semiconductor IC being integrated into a single chip. The power amplifier and the semiconductor IC are mounted on or above the module substrate. When the module substrate is viewed in a plan view, in the semiconductor IC, the switch control circuit is disposed between the first switch and the second switch.
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Patent Agency Ranking
公开(公告)号：US20210384926A1
公开(公告)日：2021-12-09
申请号：US17239911
申请日：2021-04-26
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA
IPC: H04B1/04
Abstract: A radio-frequency module includes a module substrate; a power amplifier; a first switch connected to an input terminal of the power amplifier; a second switch connected to an output terminal of the power amplifier; and a switch control circuit that controls the first switch and the second switch. The first switch, the second switch, and the switch control circuit are included in a semiconductor IC being integrated into a single chip. The power amplifier and the semiconductor IC are mounted on or above the module substrate. When the module substrate is viewed in a plan view, in the semiconductor IC, the switch control circuit is disposed between the first switch and the second switch.
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公开(公告)号：US20210234521A1
公开(公告)日：2021-07-29
申请号：US17153299
申请日：2021-01-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hiroshi KOJIMA , Reiji NAKAJIMA , Hirotsugu MORI
Abstract: A radio frequency circuit includes: an amplifier circuit configured to amplify a first radio frequency signal using a first power supply voltage, and amplify a second radio frequency signal using a second power supply voltage. The first radio frequency signal is a signal in a first band for Long Term Evolution (LTE), the second radio frequency signal is a signal in a second band for 5th Generation New Radio (5G NR) or a wireless local area network (WLAN) signal, and in a state in which a first predetermined condition regarding the first radio frequency signal and the second radio frequency signal is satisfied, a value of the second power supply voltage is greater than a value of the first power supply voltage.
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公开(公告)号：US20200235760A1
公开(公告)日：2020-07-23
申请号：US16844181
申请日：2020-04-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA
Abstract: An antenna switch of a radio frequency module selectively switches at least between connection between a first connection terminal and a common terminal and connection between a second connection terminal and the common terminal. A first connection terminal receives a signal in a first communication band. A second connection terminal receives a signal in a second communication band. When the second connection terminal and the common terminal are in connection with each other, a variable capacitor (C1, C2) of a filter circuit shifts the attenuation band of the filter circuit to a higher band than that when the first connection terminal and the common terminal are in connection with each other.
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19.发明申请公开(公告)号：US20190036488A1
公开(公告)日：2019-01-31
申请号：US16145430
申请日：2018-09-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA , Hidenori OBIYA
CPC classification number: H03F1/12 , H03F1/26 , H03F3/19 , H03F3/193 , H03F3/24 , H03F3/245 , H03F2200/21 , H03F2200/222 , H03F2200/243 , H03F2200/318 , H03F2200/451 , H03F2203/21103 , H03F2203/21127 , H03F2203/21133 , H04B1/525
Abstract: A radio-frequency signal amplifier circuit that is used in a front-end circuit configured to propagate a radio-frequency transmission signal and a radio-frequency reception signal, includes an amplifier transistor configured to amplify the radio-frequency transmission signal, a bias circuit configured to supply a bias to a signal input terminal of the amplifier transistor, a resistor having one end connected to the bias circuit and the other end connected to the signal input terminal, and an LC series resonance circuit that has one end connected to a node n1 between the resistor and the signal input terminal and the other end connected to a grounding terminal. A resonant frequency fr of the LC series resonance circuit is included in a difference frequency band between the radio-frequency transmission signal and the radio-frequency reception signal.
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公开(公告)号：US20180212644A1
公开(公告)日：2018-07-26
申请号：US15937047
申请日：2018-03-27
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Reiji NAKAJIMA
Abstract: A radio frequency front-end circuit includes an antenna, a circulator, a signal transmission circuit, and first and second variable matching circuits. The first variable matching circuit is connected between the antenna and the signal transmission circuit and variably performs matching of impedance between the antenna and the signal transmission circuit. The second variable matching circuit is connected between the circulator and the signal transmission circuit, variably performs matching of impedance between the signal transmission circuit and the circulator, and further performs, if there is impedance for which matching has not been achieved by the first variable matching circuit, matching of the impedance for which matching has not been achieved.
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