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Self-tuning radio frequency identification antenna system

  • US 20070091006A1
  • Filed: 02/16/2006
  • Published: 04/26/2007
  • Est. Priority Date: 10/21/2005
  • Status: Active Grant
First Claim
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1. A self-tuning antenna comprising:

  • a main antenna;

    an impedance compensation circuit coupled to the main antenna to vary the input impedance of the main antenna; and

    a controller coupled to the main antenna and impedance compensation circuit to automatically determine when an impedance mismatch occurs on the main antenna and automatically adjust the impedance compensation circuit to minimize the impedance mismatch.

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