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Electrically small circularly polarized antenna

  • US 9,112,258 B1
  • Filed: 06/12/2012
  • Issued: 08/18/2015
  • Est. Priority Date: 06/12/2012
  • Status: Active Grant
First Claim
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1. An electrically small circularly polarized antenna having a ka coefficient representing electrical size which is less than 0.5, the antenna comprising:

  • a ground plane;

    first and second electrically conductive half-loop rings located at the center of the ground plane, wherein the first and second rings are orthogonally crossed relative to each other and orthogonal to the ground plane;

    an RF power source feeding RF power to each of the crossed rings having a 90 degree phase difference relative to each other such that the crossed rings create orthogonal electric fields relative to each other resulting in a circularly polarized total electric field;

    an impedance matching circular electrically conductive cage structure located surrounding the crossed rings to allow electric current to circulate around the perimeter of the cage structure wherein the cage structure includes a circular copper ring above the ground plane, the circular ring supported by leg structures which rest on respective dielectric slabs on the ground plane and including a copper cross contained with the circular ring.

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