Patents by Inventor Robert B. Stedman

Robert B. Stedman 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).

  • Power combiner for use in a radio frequency system and a method of constructing a power combiner
    Patent number: 5543751
    Abstract: A power combiner including a plurality of phasing transmission lines (122) supporting a set of amplifiers (104) coupled thereto, and a plurality of matching transmission lines (124). The set of amplifiers (104) having a selectable number of amplifiers between a minimum and a maximum value. Each of the matching transmission lines (124) is coupled to one of the phasing transmission lines (122) at one end and coupled to a common node (126) at the other end. Each of the matching transmission (124) lines has a substantially equivalent characteristic impedance determined according to a function of the minimum and the maximum number of amplifiers in the set of amplifiers (104).
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: August 6, 1996
    Assignee: Motorola, Inc.
    Inventors: Robert B. Stedman, John E. Matz
  • Simulcast system and channel unit
    Patent number: 5060240
    Abstract: A simulcast broadcast uses digital signal processing techniques to scale pulse coded modulation samples of a signal for broadcast. Samples are adjusted to fully utilize all quantization levels representable by an 8-bit word. Time delay is adjustable using digital techniques by writing and reading data into and out of a RAM. Signal amplitude is adjustable by multiplying samples by a numeric factor. A computer can be used to adjust processing, delay and amplification of the digital signal processor.
    Type: Grant
    Filed: February 14, 1989
    Date of Patent: October 22, 1991
    Assignee: Motorola, Inc.
    Inventors: Paul M. Erickson, John E. Matz, Tim J. Groch, Robert B. Stedman, Mark L. Shaughnessy, Taisir Y. Kandah
  • Radio frequency shield with force multiplier interconnection fingers for an electromagnetic gasket
    Patent number: 4384165
    Abstract: A high frequency RF gasket is disclosed which provides an electromagnetic seal between a first and second piece of a shielding enclosure. The gasket comprises highly resilient finger projections which are attached to and project out along the perimeter of the first enclosure piece. The relative mating arrangement of the gasket, and first and second enclosure piece is such that a small force imposed on said first enclosure piece is resisted by a much larger resistance force along the longitudinal dimension of the highly resilient finger projections as the fingers engage the second enclosure piece. The larger resistance force causes sufficiently high pressure at the point of contact between the finger projections and the second enclosure piece so that the surface of the second enclosure piece yields to the finger projections.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: May 17, 1983
    Assignee: Motorola, Inc.
    Inventors: Robert O. Loving, Jr., Thaddeus J. Zakrzewski, Robert B. Stedman, Daryl F. Osberg