Patents Represented by Attorney Edward P. Griffin, Jr.
  • Patent number: 4435689
    Abstract: A broadband attenuator section in a meander line slow wave structure is dlosed for attenuating signals reflected between the output and input of the slow wave structure. The attenuator section comprises a multi-element ceramic support structure intermediate the meander line conductor pattern and the substrate wherein the support elements are comprised of a beryllium oxide-silicon carbide ceramic composition with a taper in the percentage of silicon carbide being provided in the transition region from a loss free section of the slow wave structure to a lossy attenuator section. The taper in percentage involves the use of ceramic support elements arranged in a sequence of 1%, 2% and 5% silicon carbide composition prior to the main attenuator section which is comprised of 10% silicon carbide - 90% beryllium oxide support elements.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: March 6, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Hunter L. McDowell
  • Patent number: 4431999
    Abstract: The described system utilizes a pair of antenna beam patterns, one of which s adapted to provide the desired signal and all interfering signals, and the other of which is adapted to provide only the interfering signals. The patterns are then combined to produce substantially only the desired signal as the combined output.
    Type: Grant
    Filed: July 8, 1982
    Date of Patent: February 14, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Frank S. Gutleber
  • Patent number: 4405986
    Abstract: An accurate and constantly updated attitude instrument is provided for aiaft. The pitch and roll angles are calculated from two sets of velocity measurements, one set being derived from signals received from orbiting navigational satellites and the other set from on-board equipment which determines the aircraft's axial velocities. The on-board equipment may be a Doppler ground-speed sensor or an inertial system using accelerometers, the outputs of which are integrated to derive the axial velocities.
    Type: Grant
    Filed: April 17, 1981
    Date of Patent: September 20, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Jack Gray
  • Patent number: 4389650
    Abstract: A line source antenna adapted for a light weight, compact phased array radar and consisting of a plurality of radiating slots periodically located in one side wall of a length of waveguide, having a single monolithic ferrite phase shifter in the form of a long continuous toroid extending the length of all of the slots.
    Type: Grant
    Filed: November 10, 1980
    Date of Patent: June 21, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Richard A. Stern
  • Patent number: 4388723
    Abstract: A radio receiving system partially overcomes jamming and other interference y receiving on a narrow selected frequency which is rapidly changed, i.e., fast frequency hopping (FFH). The system includes a broadband receiving antenna array and a steerable null antenna processor which creates an antenna null pattern. A control device connected to the (FFH) radio connects a portion of the intermediate frequency (IF) of the radio to a bank of three narrowband IF filters in the control device. The output of the first IF filter, at the IF frequency, provides the signal (S) level and the outputs of the second and third filters, which are offset from the IF frequency, are summed to provide the interference (I) level; the I and S levels being used to control the antenna processor.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: June 14, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: James Keen
  • Patent number: 4387376
    Abstract: A radio interferometer system and method for obtaining more accurate readings from a radio source by processing the received signal as a plane wave and establishing coincidence locations and conditions, and discarding readings which are noncoincidence within a selected tolerance.
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: June 7, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: William M. Sherrill, Douglas N. Travers, Paul E. Martin