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Multi-frequency RFID apparatus and methods of reading RFID tags

  • US 7,423,606 B2
  • Filed: 09/30/2004
  • Issued: 09/09/2008
  • Est. Priority Date: 09/30/2004
  • Status: Active Grant
First Claim
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1. A portable/handheld device, comprising:

  • a processing module configured to selectively operate a reading mode selected from a far-field mode and a near-field mode; and

    a directional antenna array coupled to said processing module, said directional antenna array comprising;

    a first antenna element configured to radiate electromagnetic (EM) radiation in a far-field; and

    a second antenna element coupled to said first antenna element, said second antenna element configured to radiate EM radiation in a near-field, said second antenna element comprising an antenna transducer configured to selectively cancel far-field EM radiation from said first antenna element.

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