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Dual-frequency choke-ring ground planes

  • US 6,278,407 B1
  • Filed: 02/23/1999
  • Issued: 08/21/2001
  • Est. Priority Date: 02/24/1998
  • Status: Expired due to Term
First Claim
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1. A choke ring ground plane for an antenna, said ground plane comprising:

  • a circular-shaped body having a top surface, a bottom surface, a thickness between said top and bottom surfaces, said top surface having periphery and a center point at the center of said top surface;

    a plurality of concentric grooves formed in the top surface of said circular-shaped body, said grooves being centered about said center point;

    an intermediate ground plane located in one of said grooves, said intermediate ground plane being parallel to said top surface;

    at least one aperture formed in said intermediate ground plane, and at least one electromagnetic filter disposed at each said aperture.

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