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Coupled transponder and antenna system and method

  • US 7,019,711 B2
  • Filed: 09/02/2003
  • Issued: 03/28/2006
  • Est. Priority Date: 12/16/2002
  • Status: Expired due to Fees
First Claim
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1. An annular antenna apparatus comprising:

  • a toroidal body composed of a material having high electromagnetic permeability and the body having a through bore;

    an electrical device coupled to the toroidal body;

    a loop antenna disposed to extend axially through the through bore with clearance in direct magnetic coupled relationship with the toroidal body, the loop antenna comprising a continuous loop and having a configuration providing elongation capacity with which to counter externally originating strain forces imposed on the apparatus.

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