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Planar microstrip Yagi antenna array

  • US 5,220,335 A
  • Filed: 02/28/1991
  • Issued: 06/15/1993
  • Est. Priority Date: 03/30/1990
  • Status: Expired due to Term
First Claim
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1. A directional microstrip array antenna comprising:

  • a dielectric substrate having first and second surfaces;

    a group plane on the first surface of the substrate;

    a square driven patch on the second surface of the substrate connected to a source or receiver of power, the separation between said driven patch and said groundplane being 0.1 wavelength or less;

    a square isolated reflector patch coplanar with the driven patch on one side thereof for mutual coupling there between, the center to center distance between the driven and reflector patches being 0.35 free space wavelength;

    a square first isolated director patch coplanar with the driven patch on the side opposite said one side of said reflector patch, the center to center distance between the driven and director patches being 0.30 free wavelength;

    first feed point means for applying a first signal along a midline of the driven patch transverse to an antenna array axis at a first distance from the center of the driven patch; and

    second feed point means for applying a second signal along a midline of the driven patch parallel to the antenna array axis at a second distance from the center of the driven patch, said first and second distances being different and said second signal having a phase shift relative to said first signal in the range of 115°

    so that the antenna is circularly polarized,whereby the antenna beam is tilted toward the axis of the antenna array by the parasitic coupling across gaps between the driven and isolated patches.

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