Patents by Inventor Izuru Naito

Izuru Naito 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: 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
  • Patent number: 8145123
    Abstract: A beam forming apparatus of a satellite is configured to: define a perimeter of a coverage area, and define a coordinate grid of a polar coordinate system so as to divide the coverage area into a plurality of small areas; calculate coordinates of borders between basic cells in a Cartesian coordinate system, the basic cells being shaped into regular hexagons arranged to be in contact with one another along their sides and at their vertices or into circles circumscribing the regular hexagons; define a plurality of new cells by converting, through coordinate transformation, the coordinates of the borders between the basic cells in the Cartesian coordinate system into coordinates of borders in the polar coordinate system; and set amplitudes and phases to the plurality of antenna devices that are suitable to form a plurality of beams in respective directions of the plurality of new cells.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: March 27, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Yamamoto, Tamotsu Nishino, Izuru Naito, Yoshihiko Konishi
  • Publication number: 20110212681
    Abstract: A beam forming apparatus of a satellite is configured to: define a perimeter of a coverage area, and define a coordinate grid of a polar coordinate system so as to divide the coverage area into a plurality of small areas; calculate coordinates of borders between basic cells in a Cartesian coordinate system, the basic cells being shaped into regular hexagons arranged to be in contact with one another along their sides and at their vertices or into circles circumscribing the regular hexagons; define a plurality of new cells by converting, through coordinate transformation, the coordinates of the borders between the basic cells in the Cartesian coordinate system into coordinates of borders in the polar coordinate system; and set amplitudes and phases to the plurality of antenna devices that are suitable to form a plurality of beams in respective directions of the plurality of new cells.
    Type: Application
    Filed: November 10, 2009
    Publication date: September 1, 2011
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinichi Yamamoto, Tamotsu Nishino, Izuru Naito, Yoshihiko Konishi
  • 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
  • Patent number: 7091804
    Abstract: The present invention aims at providing a rotary joint which is of a thin type and has broad band characteristics and which is low in loss and is excellent in power resistance as well. In order to attain the object, the rotary joint includes: first and second polarizers each having a common side terminal connected to a waveguide portion, and two branch side terminals through which two polarized waves orthogonal to each other inputted through the common side terminal are separately taken out; and the waveguide portion which has a rotatable connection portion, one end of which is connected to the common side terminal of the first polarizer and the other end of which is connected to the common side terminal of the second polarizer.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: August 15, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoji Aramaki, Naofumi Yoneda, Moriyasu Miyazaki, Akio Iida, Izuru Naito, Toshiyuki Horie, Yutaka Simawaki
  • Patent number: 7081863
    Abstract: A reflector antenna device includes: an auxiliary reflector 1 that receives an electric wave radiated from an opening portion by a primary radiator 3 and reflects the electric wave; and a main reflector 2 that receives the electric wave that is reflected by the auxiliary reflector 1 and radiates the electric wave to a space. In the reflector antenna device, the configurations of the auxiliary reflector 1 and the main reflector 2 are designed such that an electric power in an area of the main reflector 2 where the auxiliary reflector 1 is projected on the main reflector 2 in parallel with the radiating direction of the electric wave due to the main reflector 2 is equal 1 or lower than a predetermined first threshold value, and a radiation pattern of the antenna which is determined by the area of the main reflector 2 other than the area has a desired characteristic.
    Type: Grant
    Filed: December 25, 2003
    Date of Patent: July 25, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshio Inasawa, Shinji Kuroda, Yoshihiko Konishi, Shigeru Makino, Kenji Kusakabe, Izuru Naito
  • Patent number: 7009574
    Abstract: In order to lessen the deterioration of the VSWR, a plural-reflector antenna system is provided wherein an appropriately shaped vertex matching plate is disposed on the subreflector and electric waves that reenter the primary radiator are cancelled out. The electric waves radiated from the primary radiator are reflected by the subreflector and are radiated into space after being reflected by the main reflector. The passing area in the horn aperture, through which the reflected waves from the vertex matching plate pass, is made to be analogous to the aperture of the primary radiator, by defining the vertex matching plate as an ellipsoid, and by orienting its minor-axis direction in the major-axis direction of the main reflector and its major-axis direction, in the minor-axis direction of the main reflector.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: March 7, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Izuru Naito, Kenji Kusakabe, Toshiyuki Horie, Syuji Nuimura
  • Publication number: 20060001588
    Abstract: A reflector antenna device includes: an auxiliary reflector 1 that receives an electric wave radiated from an opening portion by a primary radiator 3 and reflects the electric wave; and a main reflector 2 that receives the electric wave that is reflected by the auxiliary reflector 1 and radiates the electric wave to a space. In the reflector antenna device, the configurations of the auxiliary reflector 1 and the main reflector 2 are designed such that an electric power in an area of the main reflector 2 where the auxiliary reflector 1 is projected on the main reflector 2 in parallel with the radiating direction of the electric wave due to the main reflector 2 is equal 1 or lower than a predetermined first threshold value, and a radiation pattern of the antenna which is determined by the area of the main reflector 2 other than the area has a desired characteristic.
    Type: Application
    Filed: December 25, 2003
    Publication date: January 5, 2006
    Inventors: Yoshio Inasawa, Shinji Kuroda, Yoshihiko Konishi, Shigeru Makino, Kenji Kusakabe, Izuru Naito
  • Publication number: 20050200547
    Abstract: In order to lessen the deterioration of the VSWR, a plural-reflector antenna system is provided wherein an appropriately shaped vertex matching plate is disposed on the subreflector and electric waves that reenter the primary radiator are cancelled out. The electric waves radiated from the primary radiator are reflected by the subreflector and are radiated into space after being reflected by the main reflector. The passing area in the horn aperture, through which the reflected waves from the vertex matching plate pass, is made to be analogous to the aperture of the primary radiator, by defining the vertex matching plate as an ellipsoid, and by orienting its minor-axis direction in the major-axis direction of the main reflector and its major-axis direction, in the minor-axis direction of the main reflector.
    Type: Application
    Filed: August 12, 2004
    Publication date: September 15, 2005
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Izuru Naito, Kenji Kusakabe, Toshiyuki Horie, Syuji Nuimura
  • Publication number: 20040135657
    Abstract: The present invention aims at providing a rotary joint which is of a thin type and has broad band characteristics and which is low in loss and is excellent in power resistance as well. In order to attain the object, the rotary joint includes: first and second polarizers each having a common side terminal connected to a waveguide portion, and two branch side terminals through which two polarized waves orthogonal to each other inputted through the common side terminal are separately taken out; and the waveguide portion which has a rotatable connection portion, one end of which is connected to the common side terminal of the first polarizer and the other end of which is connected to the common side terminal of the second polarizer.
    Type: Application
    Filed: October 21, 2003
    Publication date: July 15, 2004
    Inventors: Yoji Aramaki, Naofumi Yoneda, Moriyasu Miyazaki, Akio Iida, Izuru Naito, Toshiyuki Horie, Yutaka Simawaki
  • Patent number: 6741216
    Abstract: In order to provide a reflector antenna apparatus which can be installed within a small space, which has adequate practicality, and which can perform scanning by pivoting about two axes which are perpendicular to each other, in a reflector antenna apparatus having a Cassegrain reflector and a rotating mechanism which rotates the reflector about an azimuth axis and an elevation axis, a reflector with a substantially rectangular aperture has its elevation axis passing through substantially the central portion of the height dimension of the reflector, and reflector surface adjustment is carried out such that substantially all of the electromagnetic waves which are supplied are received and reflected, whereby the antenna height does not become large when the reflector rotates about the elevation axis. The reflector may be an array of a plurality of reflector elements.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: May 25, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshio Inasawa, Izuru Naito, Shigeru Makino, Naofumi Yoneda, Moriyasu Miyazaki, Yoshihiko Konishi, Shuji Urasaki
  • Patent number: 6727425
    Abstract: High-output transmitters are applied to a power generation satellite and a transmission antenna apparatus and a transmission antenna having an array antenna with a small number of element antennas and a reflecting mirror antenna is applied, thereby providing a power generation satellite and a transmission antenna apparatus in a space photovoltaic generation system comprising transmission antennas each having performance equivalent to that of a phased array antenna with a smaller number of transmitters and a smaller number of element antennas than those of a transmission antenna implemented as a phased array antenna.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: April 27, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuyuki Takada, Hiroyuki Satou, Izuru Naito, Izumi Mikami
  • Patent number: 6723912
    Abstract: A power generation satellite has a photoelectric conversion unit for converting sunlight into electric energy, a transmission frequency conversion unit for performing frequency conversion of the electric energy to a microwave, a microwave control unit for controlling the amplitude, the phase, or the amplitude and the phase of the microwave, and a transmitting antenna for radiating the microwave. A plurality of the power generation satellites are placed in space to form a power generation satellite group and an array antenna having the transmitting antennas of the power generation satellites in the power generation satellite group as element antennas is formed.
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: April 20, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tomohiro Mizuno, Hiroyuki Sato, Izuru Naito, Izumi Mikami
  • Publication number: 20030151558
    Abstract: In order to provide a reflector antenna apparatus which can be installed within a small space, which has adequate practicality, and which can perform scanning by pivoting about two axes which are perpendicular to each other, in a reflector antenna apparatus having a Cassegrain reflector and a rotating mechanism which rotates the reflector about an azimuth axis and an elevation axis, a reflector with a substantially rectangular aperture has its elevation axis passing through substantially the central portion of the height dimension of the reflector, and reflector surface adjustment is carried out such that substantially all of the electromagnetic waves which are supplied are received and reflected, whereby the antenna height does not become large when the reflector rotates about the elevation axis. The reflector may be an array of a plurality of reflector elements.
    Type: Application
    Filed: December 19, 2002
    Publication date: August 14, 2003
    Inventors: Yoshio Inasawa, Izuru Naito, Shigeru Makino, Naofumi Yoneda, Moriyasu Miyazaki, Yoshihiko Konishi, Shuji Urasaki
  • Publication number: 20030098058
    Abstract: High-output transmitters are applied to a power generation satellite and a transmission antenna apparatus and a transmission antenna having an array antenna with a small number of element antennas and a reflecting mirror antenna is applied, thereby providing a power generation satellite and a transmission antenna apparatus in a space photovoltaic generation system comprising transmission antennas each having performance equivalent to that of a phased array antenna with a smaller number of transmitters and a smaller number of element antennas than those of a transmission antenna implemented as a phased array antenna.
    Type: Application
    Filed: July 1, 2002
    Publication date: May 29, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Kazuyuki Takada, Hiroyuki Satou, Izuru Naito, Izumi Mikami
  • Publication number: 20030098057
    Abstract: A power generation satellite has a photoelectric conversion unit for converting sunlight into electric energy, a transmission frequency conversion unit for performing frequency conversion of the electric energy to a microwave, a microwave control unit for controlling the amplitude, the phase, or the amplitude and the phase of the microwave, and a transmitting antenna for radiating the microwave. A plurality of the power generation satellites are placed in space to form a power generation satellite group and an array antenna having the transmitting antennas of the power generation satellites in the power generation satellite group as element antennas is formed.
    Type: Application
    Filed: June 4, 2002
    Publication date: May 29, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Tomohiro Mizuno, Hiroyuki Sato, Izuru Naito, Izumi Mikami