Patents by Inventor Shuji Nuimura

Shuji Nuimura 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).

  • Patent number: 11456540
    Abstract: An antenna device includes a main reflector (11), a sub-reflector (12) including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector, and a primary emitter (13) to receive a radio wave reflected by the sub-reflector (12). Each of sub-reflector panel drive mechanisms coupled to the sub-reflector panels is finely driven. A phase calculator (171) calculates a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter (13) during driving of the sub-reflector panel drive mechanisms, and determines positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector (11) is minimized.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: September 27, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroto Ado, Shuji Nuimura, Tomohiro Mizuno
  • Publication number: 20220216618
    Abstract: A reflector antenna device includes: a primary radiator to radiate a first radio wave in a first frequency band and a second radio wave in a second frequency band lower in frequency than the first frequency band; and a reflector having a reflection face reflecting the first radio wave and the second radio wave radiated by the primary radiator, in which the reflection face of the reflector has a first region including a center point of the reflection face and a second region that is an outer peripheral region of the first region and is provided with a plurality of recesses, and each of the plurality of recesses is configured to allow entrance of the first radio wave, restrict entrance of the second radio wave, and reflect the first radio wave having entered the recess on a bottom face of the recess.
    Type: Application
    Filed: March 22, 2022
    Publication date: July 7, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiromasa NAKAJIMA, Shinichi YAMAMOTO, Michio TAKIKAWA, Shuji NUIMURA
  • Patent number: 11276940
    Abstract: A dielectric substrate is provided between a first waveguide member and a second waveguide member. The second waveguide member includes a plurality of slots for radiating a horizontally polarized wave. The dielectric substrate is provided with a plurality of line-shaped conductors arranged obliquely with respect to the waveguide axial direction and waveguide wall conductors as waveguide wall surfaces, and includes conductor-removed portions that function as vertically-polarized-wave radiation slot parallel to the waveguide axial direction. The waveguide wall conductors are connected by vias.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: March 15, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Narihiro Nakamoto, Toru Fukasawa, Shuji Nuimura
  • Publication number: 20220052459
    Abstract: An antenna device includes a main reflector (11), a sub-reflector (12) including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector, and a primary emitter (13) to receive a radio wave reflected by the sub-reflector (12). Each of sub-reflector panel drive mechanisms coupled to the sub-reflector panels is finely driven. A phase calculator (171) calculates a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter (13) during driving of the sub-reflector panel drive mechanisms, and determines positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector (11) is minimized.
    Type: Application
    Filed: August 8, 2019
    Publication date: February 17, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroto ADO, Shuji NUIMURA, Tomohiro MIZUNO
  • Patent number: 10917228
    Abstract: Calibration is performed such that phase references of element antennas match, without radiating radio waves from all element antennas at the same time. A plurality of element antennas are divided into element antenna groups, and operating element antenna sets, each including at least two element antenna groups including a measured element antenna group, are set to an operating state in order by a phase adjustment controller.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: February 9, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventor: Shuji Nuimura
  • Publication number: 20210013621
    Abstract: A dielectric substrate is provided between a first waveguide member and a second waveguide member. The second waveguide member includes a plurality of slots for radiating a horizontally polarized wave. The dielectric substrate is provided with a plurality of line-shaped conductors arranged obliquely with respect to the waveguide axial direction and waveguide wall conductors as waveguide wall surfaces, and includes conductor-removed portions that function as vertically-polarized-wave radiation slot parallel to the waveguide axial direction. The waveguide wall conductors are connected by vias.
    Type: Application
    Filed: September 25, 2020
    Publication date: January 14, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Narihiro NAKAMOTO, Toru FUKASAWA, Shuji NUIMURA
  • Publication number: 20200389285
    Abstract: Calibration is performed such that phase references of element antennas match, without radiating radio waves from all element antennas at the same time. A plurality of element antennas are divided into element antenna groups, and operating element antenna sets, each including at least two element antenna groups including a measured element antenna group, are set to an operating state in order by a phase adjustment controller.
    Type: Application
    Filed: March 29, 2018
    Publication date: December 10, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventor: Shuji NUIMURA
  • Patent number: 9929454
    Abstract: A circularly polarized wave generator includes a rectangular hollow waveguide (1), a plurality of first protrusions (2) that are provided on one pair of opposing wall surfaces in the waveguide (1), have longitudinal directions orthogonal to an axial direction of the waveguide (1), and are arranged at intervals along the axial direction, and a plurality of second protrusions (3) that are provided between the first protrusions (2) on the wall surfaces and are arranged with longitudinal directions thereof running along the axial direction.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: March 27, 2018
    Assignee: Mitsubishi Electrics Corporation
    Inventors: Yu Ushijima, Hidenori Yukawa, Tetsu Owada, Shuji Nuimura
  • Publication number: 20170170571
    Abstract: A circularly polarized wave generator includes a rectangular hollow waveguide (1), a plurality of first protrusions (2) that are provided on one pair of opposing wall surfaces in the waveguide (1), have longitudinal directions orthogonal to an axial direction of the waveguide (1), and are arranged at intervals along the axial direction, and a plurality of second protrusions (3) that are provided between the first protrusions (2) on the, all surfaces and are arranged with longitudinal directions thereof running along the axial direction.
    Type: Application
    Filed: April 2, 2015
    Publication date: June 15, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yu USHIJIMA, Hidenori YUKAWA, Tetsu OWADA, Shuji NUIMURA
  • Patent number: 9559413
    Abstract: An antenna feed circuit includes: a first hybrid circuit having a reference phase second terminal and 90° lagging phase third terminal; second hybrid circuit having a first terminal connecting to first hybrid circuit second terminal, reference phase second terminal, and 90° lagging phase third terminal; a first polarization converter/second polarization converter pair outputting at second hybrid circuit second terminal phase; third polarization converter/fourth polarization converter pair outputting at second hybrid circuit third terminal phase; third hybrid circuit having a first terminal connecting to first hybrid circuit third terminal, reference phase second terminal, and 90° lagging phase third terminal; fifth polarization converter/sixth polarization converter pair outputting at third hybrid circuit third terminal phase; and seventh polarization converter/eighth polarization converter pair outputting at third hybrid circuit second terminal phase rotated by 180°.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: January 31, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tetsuya Katase, Shuji Nuimura, Tomohiro Mizuno
  • Publication number: 20160315382
    Abstract: An antenna feed circuit includes: a first hybrid circuit having a reference phase second terminal and 90° lagging phase third terminal; second hybrid circuit having a first terminal connecting to first hybrid circuit second terminal, reference phase second terminal, and 90° lagging phase third terminal; a first polarization converter/second polarization converter pair outputting at second hybrid circuit second terminal phase; third polarization converter/fourth polarization converter pair outputting at second hybrid circuit third terminal phase; third hybrid circuit having a first terminal connecting to first hybrid circuit third terminal, reference phase second terminal, and 90° lagging phase third terminal; fifth polarization converter/sixth polarization converter pair outputting at third hybrid circuit third terminal phase; and seventh polarization converter/eighth polarization converter pair outputting at third hybrid circuit second terminal phase rotated by 180°.
    Type: Application
    Filed: December 16, 2014
    Publication date: October 27, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tetsuya KATASE, Shuji NUIMURA, Tomohiro MIZUNO
  • Patent number: 9000861
    Abstract: A polarization coupler includes: connector waveguide that connects circular waveguide with quadrangular waveguide arranged in an axial direction of circular waveguide and having short side shorter than an inner diameter of circular waveguide; flat conductor wall formed over connector and circular waveguides, and dividing the inside of connector and circular waveguides arranged parallel to an extending direction of long side of quadrangular waveguide; first inclined surface formed on inner wall of connector waveguide at a position facing one surface of conductor wall, and inclined toward conductor wall as coming closer to quadrangular waveguide; second inclined surface formed on the inner wall of connector waveguide at a position facing the other surface of conductor wall, and inclined toward conductor wall as coming closer to quadrangular waveguide; and coupling hole, formed in circular waveguide, for extracting one polarization-divided by conductor wall out of electromagnetic waves propagated through circula
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: April 7, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroto Ado, Shuji Nuimura, Tomohiro Mizuno, Hidenori Yukawa, Tetsu Owada, Takaaki Kimata
  • Publication number: 20140197908
    Abstract: A polarization coupler includes: connector waveguide that connects circular waveguide with quadrangular waveguide arranged in an axial direction of circular waveguide and having short side shorter than an inner diameter of circular waveguide; flat conductor wall formed over connector and circular waveguides, and dividing the inside of connector and circular waveguides arranged parallel to an extending direction of long side of quadrangular waveguide; first inclined surface formed on inner wall of connector waveguide at a position facing one surface of conductor wall, and inclined toward conductor wall as coming closer to quadrangular waveguide; second inclined surface formed on the inner wall of connector waveguide at a position facing the other surface of conductor wall, and inclined toward conductor wall as coming closer to quadrangular waveguide; and coupling hole, formed in circular waveguide, for extracting one polarization-divided by conductor wall out of electromagnetic waves propagated through circula
    Type: Application
    Filed: November 16, 2012
    Publication date: July 17, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroto Ado, Shuji Nuimura, Tomohiro Mizuno, Hidenori Yukawa, Tetsu Owada, Takaaki Kimata
  • Patent number: 8766865
    Abstract: An antenna device including: a reflector antenna including a primary radiator, a feed waveguide for feeding radio waves to the primary radiator, and a reflector; and a radome that covers the reflector antenna, in which the antenna device further includes a sidelobe reduction member attached to a vicinity of the primary radiator or the feed waveguide, the sidelobe reduction member reducing a sidelobe in a specific direction of an antenna by at least one of scattering and absorbing of radio waves reflected by the radome out of the radio waves radiated from the reflector antenna. Therefore, it is possible to reduce a sidelobe deterioration caused by reflection waves from the radome.
    Type: Grant
    Filed: October 5, 2010
    Date of Patent: July 1, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Yamamoto, Shuji Nuimura, Izuru Naito, Toshiyuki Horie, Hiroyuki Sato, Makio Tsuchiya
  • Patent number: 8605001
    Abstract: Radome equipment that includes an antenna device, and a radome that protects the antenna device by housing the antenna device therein and that transmits electric power necessary for communication, in which: a matching layer made of a single-layer dielectric is attached to an inner surface of the radome; and the matching layer has a thickness that is set to a value that minimizes reflection based on an impedance estimated from an interface between the matching layer and the radome before the matching layer of the radome is attached, a characteristic impedance of a medium of the matching layer, a wavelength in the matching layer, and a characteristic impedance of a medium of a space in which the radome is disposed.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: December 10, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Yamamoto, Shuji Nuimura, Izuru Naito
  • Publication number: 20120127057
    Abstract: Radome equipment that includes an antenna device, and a radome that protects the antenna device by housing the antenna device therein and that transmits electric power necessary for communication, in which: a matching layer made of a single-layer dielectric is attached to an inner surface of the radome; and the matching layer has a thickness that is set to a value that minimizes reflection based on an impedance estimated from an interface between the matching layer and the radome before the matching layer of the radome is attached, a characteristic impedance of a medium of the matching layer, a wavelength in the matching layer, and a characteristic impedance of a medium of a space in which the radome is disposed.
    Type: Application
    Filed: September 1, 2010
    Publication date: May 24, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinichi Yamamoto, Shuji Nuimura, Izuru Naito
  • Publication number: 20120098723
    Abstract: An antenna device including: a reflector antenna including a primary radiator, a feed waveguide for feeding radio waves to the primary radiator, and a reflector; and a radome that covers the reflector antenna, in which the antenna device further includes a sidelobe reduction member attached to a vicinity of the primary radiator or the feed waveguide, the sidelobe reduction member reducing a sidelobe in a specific direction of an antenna by at least one of scattering and absorbing of radio waves reflected by the radome out of the radio waves radiated from the reflector antenna. Therefore, it is possible to reduce a sidelobe deterioration caused by reflection waves from the radome.
    Type: Application
    Filed: October 5, 2010
    Publication date: April 26, 2012
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shinichi Yamamoto, Shuji Nuimura, Izuru Naito, Toshiyuki Horie, Hiroyuki Sato, Makio Tsuchiya
  • Publication number: 20080030417
    Abstract: A disk-shaped reflecting plate 3 for reflecting an electric wave emitted out of an aperture 1a of a circular waveguide 1 is placed a location which is just opposite to the aperture 1a of the circular waveguide 1, and a ring-shaped waveguide 4 for shaping the radiation characteristic of the electric wave reflected by the disk-shaped reflecting plate 3 to a rotational symmetrical radiation characteristic is disposed around the perimeter of the disk-shaped reflecting plate 3. Thereby, even when many grooves 4a need to be formed in order to make the electric wave have a rotational symmetrical radiation characteristic, it is not necessary to increase the size of the disk-shaped reflecting plate 3 in the direction of its radius.
    Type: Application
    Filed: December 13, 2004
    Publication date: February 7, 2008
    Inventors: Yoji Aramaki, Naofumi Yoneda, Yoshihiko Konishi, Izuru Naito, Toshiyuki Horie, Shuji Nuimura