Patents by Inventor David G. Spencer

David G. Spencer 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).

  • Antenna arrangements
    Patent number: 5757323
    Abstract: A microstrip patch or slot radiating element is coupled to a dielectric rod antenna by way of a tapered tubular dielectric guide formed integrally with the rod. An array of radiating elements may be formed on a common substrate, and the dielectric guide/rod antennae may be arranged to direct the energy radiated from these elements to a secondary antenna element such as a lens or a dish.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: May 26, 1998
    Assignee: Plessey Semiconductors Limited
    Inventor: David G. Spencer
  • Video signal distribution system microwave radio link for transmitting double sideband phase modulated carrier signal
    Patent number: 5619248
    Abstract: In a video signal distribution system in which a plurality of video signals are modulated onto individual carrier signals spaced over a band of frequencies to form a composite signal for transmission over cables of the system, a point-to-point radio link forming part of the distribution system is provided in which the composite signal is transmitted as double side band phase modulation of a single microwave carrier signal.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: April 8, 1997
    Assignees: Plessey Semiconductors Limited, MCEL p.l.c.
    Inventors: Mervyn K. Hobden, David G. Spencer, John G. L. Rhodes, deceased, Ronald Turner, executor
  • Polarizer arrangement
    Patent number: 5172081
    Abstract: A polarizer arrangement in accordance with the invention includes a circular depolarizer combined in a common component with a linear polarizer. The depolarizer material includes a recess within which a ferrite rod is located, a bias coil being wound around the polarizer and the rod. In another arrangement, a polyrod waveguide feed is also included in the component, being integrated with the circular depolarizer and the linear polarizer.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: December 15, 1992
    Assignee: Plessey Semiconductors Limited
    Inventors: Timothy A. Gabriel, David G. Spencer