Patents by Inventor Yoshihiro Imanishi

Yoshihiro Imanishi 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).

  • Publication number: 20230292430
    Abstract: A circuit module includes a wiring board, first and second lines, a first inductor, and a sheet-like first conductor. The first line is on the wiring board, for transmitting a signal to a first circuit, outside the wiring board, and a power supply voltage for supplying power to the first circuit. The second line is on the wiring board side by side with the first line, for transmitting a signal to a second circuit and a power supply voltage for supplying power to the second circuit, which is outside the wiring board independently of the first circuit. The first inductor is on the wiring board, having one end connected to the first line, and another end connected to a power supply circuit for supplying the power. The sheet-like first conductor is on or near at least part of a side surface of a housing that holds the first inductor.
    Type: Application
    Filed: March 7, 2023
    Publication date: September 14, 2023
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Taro HIGUCHI, Yoshihiro IMANISHI
  • Publication number: 20230276567
    Abstract: A multilayer circuit board having a signal and power isolation circuit, which can suppress the capacitive coupling between a chip inductor and a ground layer below the chip inductor and also suppress the characteristic impedance change occurring in a mounting pad on a microstrip line. Portions of the inner-layer ground below both the mounting pad on the microstrip line and the chip inductors connected to the mounting pad are separately removed respectively as the signal transmission characteristic compensation removal portion, which is formed by removing a portion having a predetermined area and situated immediately below the mounting pad, and the inductor characteristic compensation removal portion, which is formed by removing a mounting-surface-below portion having a predetermined area and situated immediately below the chip inductors.
    Type: Application
    Filed: May 2, 2023
    Publication date: August 31, 2023
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Tarou HIGUCHI, Yoshihiro IMANISHI, Yasushi SAITO, Akio IGARASHI, Minehito YOSHIDA, Hiroyuki HONDA, Masaki INUI, Yuya NAGAOKA
  • Publication number: 20230198574
    Abstract: A transmission system capable of improving transmission characteristics in a low frequency range and having reduced size. A transmission system for superimposing power on a signal transmission path between a first circuit module and a second circuit module includes a first capacitor between the transmission path and a first interface IC in the first circuit module, a second capacitor between the transmission path and a second interface IC in the second circuit module, a first inductor between a first power supply circuit in the first circuit module and the transmission path, and a second inductor between a second power supply circuit in the second circuit module and the transmission path. A capacitance value of the first capacitor and a capacitance value of the second capacitor differ from each other. Inductance values of each of the first and second inductors are in a range from 20 [?H] to 50 [?H].
    Type: Application
    Filed: February 15, 2023
    Publication date: June 22, 2023
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Tarou HIGUCHI, Yoshihiro IMANISHI, Yasushi SAITO, Akio IGARASHI, Hiroyuki HONDA, Masaki INUI, Minehito YOSHIDA
  • Publication number: 20230097690
    Abstract: A mounting structure for mounting inductors to suppress cross talk and a stub effect due to a mounting land, and reduce deterioration of signal transmission characteristics. A first Bias-T inductor is mounted on a circuit board with one electrode terminal connected to a first mounting land with an axial direction of the first Bias-T inductor oriented perpendicular to the first mounting land and the one electrode terminal extends along the first mounting land. A second Bias-T inductor is mounted on the circuit board in the vicinity of the first Bias-T inductor with one electrode terminal connected to a second mounting land with an axial direction of the second Bias-T inductor inclined by 90° with respect to the axial direction of the first Bias-T inductor and the second Bias-T inductor is oriented perpendicular to the second mounting land and the one electrode terminal extends along the second mounting land.
    Type: Application
    Filed: November 16, 2022
    Publication date: March 30, 2023
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Tarou HIGUCHI, Yoshihiro IMANISHI, Hiroyuki HONDA, Akiko SAKANE
  • Publication number: 20220359116
    Abstract: An electronic circuit includes a shield line including first and second signal lines and a shield. The first and second signal lines are connected to a signal source, and the shield coating is around the first and second signal lines. The electronic circuit further includes a signal ground near the signal source; a frame ground that is isolated from the signal ground and connected to the shield; a common mode choke coil that includes first, second and third coils magnetically coupled to one another; and a capacitor that is connected in parallel with the third coil. The first coil is connected in series between the signal source and the first signal line. The second coil is connected in series between the signal source and the second signal line. The third coil and the capacitor that are connected in parallel are connected between the signal ground and the frame ground.
    Type: Application
    Filed: June 24, 2022
    Publication date: November 10, 2022
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Tarou HIGUCHI, Yoshihiro IMANISHI, Yasushi SAITO, Hiroyuki HONDA, Minehito YOSHIDA, Akio IGARASHI, Sayaka SEKIGUCHI, Miyuki NOJIRI
  • Patent number: 11050403
    Abstract: A circuit module includes a wiring board on which are provided a ground plane, a signal line, and a conductive pattern for connection to an outer conductor of a coaxial cable including an inner conductor and the outer conductor. A common-mode choke coil is mounted on the wiring board such that one of coils of the common-mode choke coil connects the ground plane and the conductive pattern and that the other coil is inserted in the signal line. A communication element is mounted on the wiring board and includes a first signal terminal and a second signal terminal. The first signal terminal is connected to the common-mode choke coil via the signal line, and the second signal terminal is connected to the ground plane. A first capacitor is inserted in series in the signal line between the common-mode choke coil and the first signal terminal.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: June 29, 2021
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tarou Higuchi, Yoshihiro Imanishi, Yasushi Saito, Shun Takai, Miyuki Nojiri
  • Patent number: 10873255
    Abstract: An on-board charger includes input ports, output ports, an AC-DC converter, an isolated DC-DC converter, a first filter, and a second filter. The first filter is connected to the input ports. The first filter includes a first common mode choke coil, a first across-the-line capacitor, and first line bypass capacitors. The second filter is connected between the isolated DC-DC converter and each of the output ports. The second filter includes a second common mode choke coil and second line bypass capacitors.
    Type: Grant
    Filed: June 23, 2020
    Date of Patent: December 22, 2020
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroyuki Takatsuji, Hiroshi Kitada, Naomichi Enoki, Yoshihiro Imanishi
  • Publication number: 20200321856
    Abstract: An on-board charger includes input ports, output ports, an AC-DC converter, an isolated DC-DC converter, a first filter, and a second filter. The first filter is connected to the input ports. The first filter includes a first common mode choke coil, a first across-the-line capacitor, and first line bypass capacitors. The second filter is connected between the isolated DC-DC converter and each of the output ports. The second filter includes a second common mode choke coil and second line bypass capacitors.
    Type: Application
    Filed: June 23, 2020
    Publication date: October 8, 2020
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Hiroyuki TAKATSUJI, Hiroshi KITADA, Naomichi ENOKI, Yoshihiro IMANISHI
  • Patent number: 10784040
    Abstract: A transmission line includes three wires formed on a substrate. Each of the transmission lines transmits a three-level signal. A common-mode choke coil is inserted into the transmission line. The common-mode choke coil includes three coils coupled to one another and three pairs of outer electrodes, each of the three pairs being connected to the corresponding two ends of the coils. The outer electrodes of the common-mode choke coil are connected to the transmission line such that the three coils are serially inserted into the respective three wires.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: September 22, 2020
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kota Takayama, Yoshihiro Imanishi, Shingo Uda
  • Patent number: 10732211
    Abstract: An S-parameter of an object to be measured is measured, which includes (i) three transmission lines configured such that a ternary signal is transmitted through a corresponding one of the three transmission lines and (ii) six ports as total ports included in the three transmission lines each having a pair of ports. Based on the measured S-parameter, a parameter is calculated, which shows transparent characteristics in each mode among mixed-mode S-parameters in accordance with transition patterns of signal levels on the three transmission lines.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: August 4, 2020
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kota Takayama, Yoshihiro Imanishi, Yu Ishiwata, Kiyomi Ikemoto
  • Patent number: 10701693
    Abstract: An electronic apparatus includes a radio communication unit employing a WiGig method and a radio communication unit employing a Wi-Fi method. A bias T circuit is included in the radio communication unit employing the WiGig method. The bias T circuit includes inductors and a filter. The inductors are disposed between a signal line and a DC-DC converter, and are connected in series to each other. The filter has attenuation characteristics in a frequency band used by the radio communication unit employing the Wi-Fi method. One end of the filter is connected between the signal line and one of the inductors located at a first stage from the signal line.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: June 30, 2020
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yu Ishiwata, Yoshihiro Imanishi, Kiyomi Ikemoto, Kota Takayama
  • Patent number: 10630335
    Abstract: A signal transmission and reception element transmits and receives a differential signal. Two transmission lines transmit the differential signal between the signal transmission and reception element and a connector. The signal transmission and reception element is connected to an external apparatus with the connector interposed therebetween. A noise generation source generates noise in a wireless band, which is coupled to the transmission lines. An antenna has a gain in a frequency band of the noise which is generated in the noise generation source. A wireless signal processing circuit processes a signal received by the antenna. An absorption-type filter that is mounted on the transmission lines absorbs noise mixed in the transmission lines.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: April 21, 2020
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kota Saito, Yoshihiro Imanishi, Hiroshi Kitada, Hiroyuki Takatsuji, Masashi Omuro
  • Publication number: 20190386630
    Abstract: A circuit module includes a wiring board on which are provided a ground plane, a signal line, and a conductive pattern for connection to an outer conductor of a coaxial cable including an inner conductor and the outer conductor. A common-mode choke coil is mounted on the wiring board such that one of coils of the common-mode choke coil connects the ground plane and the conductive pattern and that the other coil is inserted in the signal line. A communication element is mounted on the wiring board and includes a first signal terminal and a second signal terminal. The first signal terminal is connected to the common-mode choke coil via the signal line, and the second signal terminal is connected to the ground plane. A first capacitor is inserted in series in the signal line between the common-mode choke coil and the first signal terminal.
    Type: Application
    Filed: August 29, 2019
    Publication date: December 19, 2019
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Tarou HIGUCHI, Yoshihiro IMANISHI, Yasushi SAITO, Shun TAKAI, Miyuki NOJIRI
  • Patent number: 10490343
    Abstract: Three or more of n inductors are arranged inside an insulating member. Inside the insulating member, each of the inductors includes coil conductors that are contained in respective coil conductor layers that are stacked in a first direction and via conductors, each of which connects the coil conductors that are contained in the coil conductor layers adjoining in the first direction. Each of the coil conductor layers contains the n coil conductors of the inductors, and a pattern formed of the coil conductors contained in each of the coil conductor layers has n-fold rotational symmetry.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: November 26, 2019
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kota Takayama, Yoshihiro Imanishi, Yu Ishiwata, Kiyomi Ikemoto
  • Patent number: 10348251
    Abstract: A power supply circuit includes a plurality of power amplifiers for amplifying radio frequency signals, an envelope tracker for supplying a variable voltage based on an envelope signal to the power amplifiers, a common line connected to an output side of the envelope tracker, and a plurality of branch lines branching from a tip of the common line and connected to the power amplifiers, respectively. On the branch lines, sub-inductors are provided, respectively. On the common line, a main inductor and a capacitor are provided.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: July 9, 2019
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yu Ishiwata, Yoshihiro Imanishi, Shingo Uda, Tatsumasa Kawahara, Kota Takayama
  • Publication number: 20180145640
    Abstract: A power supply circuit includes a plurality of power amplifiers for amplifying radio frequency signals, an envelope tracker for supplying a variable voltage based on an envelope signal to the power amplifiers, a common line connected to an output side of the envelope tracker, and a plurality of branch lines branching from a tip of the common line and connected to the power amplifiers, respectively. On the branch lines, sub-inductors are provided, respectively. On the common line, a main inductor and a capacitor are provided.
    Type: Application
    Filed: January 3, 2018
    Publication date: May 24, 2018
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yu ISHIWATA, Yoshihiro IMANISHI, Shingo UDA, Tatsumasa KAWAHARA, Kota TAKAYAMA
  • Publication number: 20180145716
    Abstract: A signal transmission and reception element transmits and receives a differential signal. Two transmission lines transmit the differential signal between the signal transmission and reception element and a connector. The signal transmission and reception element is connected to an external apparatus with the connector interposed therebetween. A noise generation source generates noise in a wireless band, which is coupled to the transmission lines. An antenna has a gain in a frequency band of the noise which is generated in the noise generation source. A wireless signal processing circuit processes a signal received by the antenna. An absorption-type filter that is mounted on the transmission lines absorbs noise mixed in the transmission lines.
    Type: Application
    Filed: October 20, 2017
    Publication date: May 24, 2018
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Kota SAITO, Yoshihiro IMANISHI, Hiroshi KITADA, Hiroyuki TAKATSUJI, Masashi OMURO
  • Publication number: 20180098324
    Abstract: An electronic apparatus includes a radio communication unit employing a WiGig method and a radio communication unit employing a Wi-Fi method. A bias T circuit is included in the radio communication unit employing the WiGig method. The bias T circuit includes inductors and a filter. The inductors are disposed between a signal line and a DC-DC converter, and are connected in series to each other. The filter has attenuation characteristics in a frequency band used by the radio communication unit employing the Wi-Fi method. One end of the filter is connected between the signal line and one of the inductors located at a first stage from the signal line.
    Type: Application
    Filed: August 4, 2017
    Publication date: April 5, 2018
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Yu ISHIWATA, Yoshihiro IMANISHI, Kiyomi IKEMOTO, Kota TAKAYAMA
  • Publication number: 20180005752
    Abstract: Three or more of n inductors are arranged inside an insulating member. Inside the insulating member, each of the inductors includes coil conductors that are contained in respective coil conductor layers that are stacked in a first direction and via conductors, each of which connects the coil conductors that are contained in the coil conductor layers adjoining in the first direction. Each of the coil conductor layers contains the n coil conductors of the inductors, and a pattern formed of the coil conductors contained in each of the coil conductor layers has n-fold rotational symmetry.
    Type: Application
    Filed: May 19, 2017
    Publication date: January 4, 2018
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Kota TAKAYAMA, Yoshihiro IMANISHI, Yu ISHIWATA, Kiyomi IKEMOTO
  • Publication number: 20170356940
    Abstract: An S-parameter of an object to be measured is measured, which includes (i) three transmission lines configured such that a ternary signal is transmitted through a corresponding one of the three transmission lines and (ii) six ports as total ports included in the three transmission lines each having a pair of ports. Based on the measured S-parameter, a parameter is calculated, which shows transparent characteristics in each mode among mixed-mode S-parameters in accordance with transition patterns of signal levels on the three transmission lines.
    Type: Application
    Filed: May 4, 2017
    Publication date: December 14, 2017
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Kota TAKAYAMA, Yoshihiro IMANISHI, Yu ISHIWATA, Kiyomi IKEMOTO