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Data link antenna system

  • US 5,389,941 A
  • Filed: 02/28/1992
  • Issued: 02/14/1995
  • Est. Priority Date: 02/28/1992
  • Status: Expired due to Term
First Claim
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1. An antenna system having omni-directional radiation coverage, comprising:

  • a plurality of antennas, each disposed to illuminate only a respective sector relative to a desired omnidirectional radiation coverage;

    means for selectively coupling an RF drive signal to only a selected one of said antennas to radiate said signal only to the sector illuminated by said selected antenna; and

    wherein each of said antennas comprises;

    a parabolic cylindrical reflector surface characterized by a focus disposed above said surface;

    a dipole structure arranged such that the back radiation of said dipole illuminates said reflector surface, the forward radiation of said dipole being free to radiate away from said surface without being redirected to said surface; and

    means for supporting said dipole structure above said surface for feeding said drive signal to said dipole structure, said supporting and feeding means comprising an electrically conductive hollow support mast extending from said surface and to which said dipole structure is attached, and a center conductor element which extends through said hollow support mast to define a coaxial transmission line.

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