Patents by Inventor Shoji Nagumo
Shoji Nagumo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230261677Abstract: An RF module includes first and second filters having pass bands corresponding to a TDD band. One low-noise amplifier's input is connected to the first filter and output is connected to a first RF output to provide a TDD band downlink signal. Another low-noise amplifier's input is connected to the second filter and output is connected to a second RF output to provide a TDD band downlink signal. A first switch includes terminals respectively connected to a first antenna connection, the first filter, and an RF input to receive a TDD band uplink signal. A second switch includes terminals respectively connected to a second antenna connection terminal, the second filter, and the RF input. The switches are formed on different dies. The second switch is also connected to the first switch via wiring outside the dies, and the first switch is connected to the RF input via the second switch.Type: ApplicationFiled: April 19, 2023Publication date: August 17, 2023Applicant: Murata Manufacturing Co., Ltd.Inventors: Shoji NAGUMO, Hirotsugu MORI
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Patent number: 11336309Abstract: A front-end module includes: a first front-end circuit that transmits signals in a first band in a CA mode; and a second front-end circuit that transmits signals in a second band in the CA mode. The second front-end circuit includes a second quadplexer for the first and second bands. The first front-end circuit includes: a first quadplexer for the first and second bands; and an impedance variable circuit that is connected to a transmission terminal that is included in the first quadplexer and corresponds to the second band. In the CA mode, the impedance variable circuit serves as a reflection circuit that causes reflection of transmission waves in the second band. In a non-CA mode, the impedance variable circuit serves as a matching circuit that transmits or absorbs transmission waves in the second band.Type: GrantFiled: February 7, 2020Date of Patent: May 17, 2022Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shoji Nagumo, Kanta Motoki, Shiyunsuke Ootomo
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Patent number: 11276521Abstract: An electronic component includes a multilayer body including dielectric layers, a circuit pattern, and band-shaped conductor patterns. The circuit pattern includes a conductor pattern that is disposed inside the multilayer body and defines an inductor. The band-shaped conductor patterns are grounded and cover a portion of a shield surface. An internal surface is located between the circuit pattern and an upper surface. On a shield surface, a non-shielded area is provided which is not covered with any of the band-shaped conductor patterns, and through which magnetic flux generated from the inductor is able to pass.Type: GrantFiled: February 28, 2019Date of Patent: March 15, 2022Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kunihiro Miyahara, Yutaka Masuda, Kanta Motoki, Shoji Nagumo
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Patent number: 10979096Abstract: A high-frequency front-end circuit includes a diplexer, a duplexer, and a low-band-side multiple reflection prevention unit. The diplexer includes an antenna connection terminal, a low-band-side terminal, and a high-band-side terminal, and separates a low-band communication signal and a high-band communication signal. The duplexer separates a transmission signal and a reception signal of the low-band communication signal. The multiple reflection prevention unit is disposed between the low-band-side terminal and the duplexer and reduces or prevents multiple reflections of a leakage signal of the high-band communication signal which leaks to the low band side.Type: GrantFiled: March 21, 2019Date of Patent: April 13, 2021Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shoji Nagumo, Kanta Motoki, Yusaku Muroya
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Patent number: 10886951Abstract: A front-end module that uses a carrier aggregation scheme in which Band, which is selected from a low-frequency band group, and Band, which is selected from a high-frequency band group, are used simultaneously for communication includes a plurality of signal paths that connect a power amplifier module to an antenna element, and an antenna switch module that switches connection between the antenna element and the plurality of signal paths. Harmonics of Band have frequencies that are included in Band. The front-end module further includes a switch element disposed in a TDD transmission path.Type: GrantFiled: January 15, 2018Date of Patent: January 5, 2021Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shoji Nagumo, Kanta Motoki, Keiji Hiejima
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Publication number: 20200177214Abstract: A front-end module includes: a first front-end circuit that transmits signals in a first band in a CA mode; and a second front-end circuit that transmits signals in a second band in the CA mode. The second front-end circuit includes a second quadplexer for the first and second bands. The first front-end circuit includes: a first quadplexer for the first and second bands; and an impedance variable circuit that is connected to a transmission terminal that is included in the first quadplexer and corresponds to the second band. In the CA mode, the impedance variable circuit serves as a reflection circuit that causes reflection of transmission waves in the second band. In a non-CA mode, the impedance variable circuit serves as a matching circuit that transmits or absorbs transmission waves in the second band.Type: ApplicationFiled: February 7, 2020Publication date: June 4, 2020Inventors: Shoji NAGUMO, Kanta MOTOKI, Shiyunsuke OOTOMO
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Publication number: 20190222253Abstract: A high-frequency front-end circuit includes a diplexer, a duplexer, and a low-band-side multiple reflection prevention unit. The diplexer includes an antenna connection terminal, a low-band-side terminal, and a high-band-side terminal, and separates a low-band communication signal and a high-band communication signal. The duplexer separates a transmission signal and a reception signal of the low-band communication signal. The multiple reflection prevention unit is disposed between the low-band-side terminal and the duplexer and reduces or prevents multiple reflections of a leakage signal of the high-band communication signal which leaks to the low band side.Type: ApplicationFiled: March 21, 2019Publication date: July 18, 2019Inventors: Shoji NAGUMO, Kanta MOTOKI, Yusaku MUROYA
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Publication number: 20190198230Abstract: An electronic component includes a multilayer body including dielectric layers, a circuit pattern, and band-shaped conductor patterns. The circuit pattern includes a conductor pattern that is disposed inside the multilayer body and defines an inductor. The band-shaped conductor patterns are grounded and cover a portion of a shield surface. An internal surface is located between the circuit pattern and an upper surface. On a shield surface, a non-shielded area is provided which is not covered with any of the band-shaped conductor patterns, and through which magnetic flux generated from the inductor is able to pass.Type: ApplicationFiled: February 28, 2019Publication date: June 27, 2019Inventors: Kunihiro MIYAHARA, Yutaka MASUDA, Kanta MOTOKI, Shoji NAGUMO
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Patent number: 10084229Abstract: This disclosure provides an antenna apparatus in which stable antenna characteristics are maintained by detecting surrounding conditions that affect the antenna characteristics and appropriately compensating the antenna characteristics. More specifically, when surrounding condition such as a human body (e.g., a palm or fingers) approaches and enters an electric field of a pseudo dipole formed by an antenna element electrode, a stray capacitance is sensed and stable antenna characteristics are maintained by appropriately controlling an antenna matching circuit to compensate for a change in the antenna characteristics due to the approach of the surrounding condition.Type: GrantFiled: February 24, 2012Date of Patent: September 25, 2018Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoji Nagumo, Masaaki Takata, Noriyuki Ueki, Hiromasa Koyama
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Publication number: 20180138927Abstract: A front-end module that uses a carrier aggregation scheme in which Band, which is selected from a low-frequency band group, and Band, which is selected from a high-frequency band group, are used simultaneously for communication includes a plurality of signal paths that connect a power amplifier module to an antenna element, and an antenna switch module that switches connection between the antenna element and the plurality of signal paths. Harmonics of Band have frequencies that are included in Band. The front-end module further includes a switch element disposed in a TDD transmission path.Type: ApplicationFiled: January 15, 2018Publication date: May 17, 2018Inventors: Shoji NAGUMO, Kanta MOTOKI, Keiji HIEJIMA
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Patent number: 9866195Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: GrantFiled: July 11, 2017Date of Patent: January 9, 2018Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoji Nagumo, Masashi Nakazato, Motoyasu Nakao, Yuji Shintomi
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Publication number: 20170310298Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: ApplicationFiled: July 11, 2017Publication date: October 26, 2017Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Shoji NAGUMO, Masashi NAKAZATO, Motoyasu NAKAO, Yuji SHINTOMI
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Patent number: 9748917Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: GrantFiled: July 15, 2014Date of Patent: August 29, 2017Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoji Nagumo, Masashi Nakazato, Motoyasu Nakao, Yuji Shintomi
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Patent number: 9571145Abstract: A high frequency circuit module includes a variable inductance circuit portion and a reactance circuit portion. The variable inductance circuit portion is connected between an antenna port and ground. The variable reactance circuit is connected between the antenna port and a front-end port. The variable inductance circuit portion includes a first inductor, a second inductor, and a switch. The first inductor is connected between the antenna port and the ground. The second inductor and the switch are connected in series, and this series circuit is connected in parallel to the first inductor.Type: GrantFiled: September 15, 2014Date of Patent: February 14, 2017Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoji Nagumo, Tetsuro Harada, Minoru Iwanaga, Tomohiro Nagai
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Patent number: 9236657Abstract: A low-frequency radiating element and a high-frequency radiating element are configured so as to respectively operate in a relatively low frequency band and a relatively high frequency band that are non-contiguous with each other. A matching circuit is inserted between a transmission/reception circuit and a branching point. A high-frequency variable reactance circuit is inserted between the branching point and the high-frequency radiating element. A low-frequency variable reactance circuit is inserted between the branching point and the low-frequency radiating element. The high-frequency variable reactance circuit and the low-frequency variable reactance circuit are configured such that their reactances can be adjusted independently of each other.Type: GrantFiled: January 8, 2014Date of Patent: January 12, 2016Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shoji Nagumo, Minoru Iwanaga, Masahi Nakazato, Tomohiro Nagai
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Patent number: 9188616Abstract: A capacitance detecting circuit includes a constant current source supplying a constant current to a voltage detection point, a time measuring unit measuring time of charge until the voltage of the voltage detection point reaches a prescribed voltage, a storage unit and an operation unit. The storage unit stores first data obtained in advance concerning the time of charge of a capacitance element having a known capacitance value, and second data obtained in advance concerning the time of charge of a capacitance component. The operation unit generates third data representing the time of charge of an object of detection from a difference between the first measurement value of the time measuring unit when the capacitance component is connected to the voltage detection point and the second data, and based on the ratio between the third data and the first data and the known capacitance value, calculates the capacitance value of the object of detection.Type: GrantFiled: October 8, 2014Date of Patent: November 17, 2015Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shoji Nagumo, Masashi Nakazato, Yujie Dai, Xiaoxing Zhang, Yingjie Lu
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Publication number: 20150311881Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: ApplicationFiled: July 15, 2014Publication date: October 29, 2015Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Shoji NAGUMO, Masashi NAKAZATO, Motoyasu NAKAO, Yuji SHINTOMI
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Publication number: 20150118984Abstract: A high frequency circuit module includes a variable inductance circuit portion and a reactance circuit portion. The variable inductance circuit portion is connected between an antenna port and ground. The variable reactance circuit is connected between the antenna port and a front-end port. The variable inductance circuit portion includes a first inductor, a second inductor, and a switch. The first inductor is connected between the antenna port and the ground. The second inductor and the switch are connected in series, and this series circuit is connected in parallel to the first inductor.Type: ApplicationFiled: September 15, 2014Publication date: April 30, 2015Inventors: Shoji NAGUMO, Tetsuro HARADA, Minoru IWANAGA, Tomohiro NAGAI
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Publication number: 20150084652Abstract: A capacitance detecting circuit includes a constant current source supplying a constant current to a voltage detection point, a time measuring unit measuring time of charge until the voltage of the voltage detection point reaches a prescribed voltage, a storage unit and an operation unit. The storage unit stores first data obtained in advance concerning the time of charge of a capacitance element having a known capacitance value, and second data obtained in advance concerning the time of charge of a capacitance component. The operation unit generates third data representing the time of charge of an object of detection from a difference between the first measurement value of the time measuring unit when the capacitance component is connected to the voltage detection point and the second data, and based on the ratio between the third data and the first data and the known capacitance value, calculates the capacitance value of the object of detection.Type: ApplicationFiled: October 8, 2014Publication date: March 26, 2015Inventors: Shoji Nagumo, Masashi Nakazato, Yujie Dai, Xiaoxing Zhang, Yingjie Lu
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Publication number: 20140198009Abstract: A low-frequency radiating element and a high-frequency radiating element are configured so as to respectively operate in a relatively low frequency band and a relatively high frequency band that are non-contiguous with each other. A matching circuit is inserted between a transmission/reception circuit and a branching point. A high-frequency variable reactance circuit is inserted between the branching point and the high-frequency radiating element. A low-frequency variable reactance circuit is inserted between the branching point and the low-frequency radiating element. The high-frequency variable reactance circuit and the low-frequency variable reactance circuit are configured such that their reactances can be adjusted independently of each other.Type: ApplicationFiled: January 8, 2014Publication date: July 17, 2014Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Shoji NAGUMO, Minoru IWANAGA, Masahi NAKAZATO, Tomohiro NAGAI