Patents by Inventor Andrew L. Roberts

Andrew L. Roberts 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).

  • Dual frequency coaxial feed with suppressed sidelobes and equal beamwidths
    Patent number: 6577283
    Abstract: An antenna feed in a satellite system that provides substantially equal E-plane and H-plane patterns. The feed includes outer and inner conductive walls that are coaxial, and define an outer waveguide therebetween and an inner waveguide within the inner conductive wall. The feed includes a first cylindrical waveguide section, a tapered waveguide section, and a second cylindrical waveguide section at the aperture of the feed. Downlink signals are in signal communication with the first cylindrical waveguide section so that the downlink signals are launched into the outer waveguide and out of the feed. Uplink signals received by the inner waveguide are directed to suitable uplink reception devices. One or both of the outer or inner conductive walls include an array of radially disposed iris pins at the aperture that interact with the uplink and/or downlink signals to provide beam symmetry or equal E-plane and H-plane patterns.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: June 10, 2003
    Assignee: Northrop Grumman Corporation
    Inventors: Te-Kao Wu, Teh-Kan Tung, Andrew L. Roberts
  • Dual frequency coaxial feed with suppressed sidelobes and equal beamwidths
    Publication number: 20020149532
    Abstract: An antenna feed in a satellite system that provides substantially equal E-plane and H-plane patterns. The feed includes outer and inner conductive walls that are coaxial, and define an outer waveguide therebetween and an inner waveguide within the inner conductive wall. The feed includes a first cylindrical waveguide section, a tapered waveguide section, and a second cylindrical waveguide section at the aperture of the feed. Downlink signals are in signal communication with the first cylindrical waveguide section so that the downlink signals are launched into the outer waveguide and out of the feed. Uplink signals received by the inner waveguide are directed to suitable uplink reception devices. One or both of the outer or inner conductive walls include an array of radially disposed iris pins at the aperture that interact with the uplink and/or downlink signals to provide beam symmetry or equal E-plane and H-plane patterns.
    Type: Application
    Filed: April 16, 2001
    Publication date: October 17, 2002
    Inventors: Te-Kao Wu, Teh-Kan Tung, Andrew L. Roberts
  • WIDEBAND MATCHING SURFACE FOR DIELECTRIC LENS AND/OR RADOMES AND/OR ABSORBERS
    Publication number: 20020097190
    Abstract: A wideband matching surface (600) for a dielectric lens antenna (100) is formed from a first dielectric layer (602) (e.g., Rexolite™) characterized by a first refractive index and a second dielectric layer (604) characterized by a second refractive index supporting the first dielectric layer (602).
    Type: Application
    Filed: December 6, 2000
    Publication date: July 25, 2002
    Inventors: Te-Kao Wu, David L. Brundrett, Andrew L. Roberts, Brent T. Toland, Kenneth A. Hummer
  • Wideband matching surface for dielectric lens and/or radomes and/or absorbers
    Patent number: 6424308
    Abstract: A wideband matching surface (600) for a dielectric lens antenna (100) is formed from a first dielectric layer (602) (e.g., Rexolite™) characterized by a first refractive index and a second dielectric layer (604) characterized by a second refractive index supporting the first dielectric layer (602).
    Type: Grant
    Filed: December 6, 2000
    Date of Patent: July 23, 2002
    Assignee: TRW Inc.
    Inventors: Te-Kao Wu, David L. Brundrett, Andrew L. Roberts, Brent T. Toland, Kenneth A. Hummer