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Radio frequency identification (RFID) tags and methods of communicating between a radio frequency identification (RFID) tag and an interrogator

  • US 7,898,389 B2
  • Filed: 07/07/2006
  • Issued: 03/01/2011
  • Est. Priority Date: 02/04/1998
  • Status: Expired due to Fees
First Claim
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1. A radio frequency identification (RFID) tag, comprising:

  • a loop antenna formed upon a first surface of the RFID tag, the loop antenna operable to receive communications signals;

    a dipole antenna formed upon the first surface of the RFID tag, the dipole antenna having a first half and a second half and operable to output communications signals, the first half of the dipole antenna having a first antenna port, and the second half of the dipole antenna having a second antenna port;

    wherein the loop antenna and the dipole antenna are separated on the first surface by a distance corresponding to one wavelength of the communications signals; and

    a switch coupled to the first and second antenna ports and operable to electrically short or electrically isolate the first and second halves of the dipole antenna.

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