Patents Examined by Eli Leiberman
  • Subsurface antenna system
    Patent number: 4687445
    Abstract: A subsurface antenna system including at least one pair of radiating elements and feed system is buried within a subsurface medium. The radiating elements comprising the system are spaced apart at least one quarter free space wavelength at an operating frequency. The radiating elements are spaced from each other and the feed system provides appropriate relative phase to signals at the elements to produce from the antenna system a directional antenna pattern in free space.
    Type: Grant
    Filed: February 20, 1981
    Date of Patent: August 18, 1987
    Assignee: RCA Corporation
    Inventor: John C. Williams