Patents by Inventor Motoo Mizusawa

Motoo Mizusawa 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).

  • Multiple frequency antenna feed system
    Patent number: 4358770
    Abstract: An multi-frequency antenna feed system has a corrugated conical horn and a diplexer interconnected serially to be operative in two frequency bands represented by frequencies f.sub.H and f.sub.L corresponding to wavelengths .lambda..sub.H and .lambda..sub.L respectively, where 2f.sub.L .ltoreq.f.sub.H. Corrugated grooves on the inner surface of the conical horn have the depth h, where .lambda..sub.L /4<h<.lambda..sub.L /2. The corrugated conical horn has the inside diameter at its reduced diameter end which is not less than 2.6.lambda..sub.o, where .lambda..sub.o designates a wavelength at which the depth of the corrugated grooves ranges from three quarters of the wavelength and one complete wavelength.
    Type: Grant
    Filed: September 11, 1980
    Date of Patent: November 9, 1982
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toshio Satoh, Motoo Mizusawa, Fumio Takeda
  • Offset dual-reflector aerial having tapered reflector segments in main reflector
    Patent number: 4319250
    Abstract: A subreflector and reflectors in a primary radiation system, these constituting an offset dual-reflector aerial, are subjected to the so-called reflector-surface shaping. The main reflector is formed as a part of a revolutional paraboloid, and is a combination of a number of congruent reflector-segments. With such an arrangement, the manufacturing cost of a large-sized main reflector is reduced. The production error, and the aerial gain reduction and the deterioration of a wide-angle directivity due to the production error are minimized.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: March 9, 1982
    Assignees: Nippon Telegraph & Telephone Public Corp., Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tadashi Takano, Motoo Mizusawa, Shinichi Betsudan, Shigeru Sato
  • Cassegrainian antenna with beam waveguide feed to reduce spillover
    Patent number: 4186402
    Abstract: An aerial system (antenna system) comprisesdual-reflector aerial consisting of a main reflector and subreflector;a primary feed whose input and output ends are fixed for elevation and azimuth rotation of said dual-reflector aerial;a plane reflector which is turned together with said dual-reflector aerial around an elevation rotating axis;a first curved reflector for reflecting waves generated from said primary feed; andsecond and third curved reflectors which sequentially reflect to lead the wave reflected by said first curved reflector to said plane reflector.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: January 29, 1980
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Motoo Mizusawa, Chikao Kinoshita, Shinichi Betsudan, Sigeru Sato
  • Reflector antenna having main and subreflector of diverse curvature
    Patent number: 3995275
    Abstract: A reflector antenna used for radar, etc, has a subreflector so as to give a relatively large aperture diameter for a primary radiator, and to decrease the effect of the outer atmosphere.A subreflector having a different curvature in a vertical plane than a curvature in a horizontal plane is provided whereby an antenna having a different beam width in the vertical plane to that in the horizontal plane is provided even though a primary radiator having a rotationally symmetrical beam is employed.
    Type: Grant
    Filed: June 25, 1974
    Date of Patent: November 30, 1976
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shinichi Betsudan, Masanao Iimori, Motoo Mizusawa, Shuji Urasaki