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Antenna systems for passive RFID tags

  • US 20090045961A1
  • Filed: 08/13/2007
  • Published: 02/19/2009
  • Est. Priority Date: 08/13/2007
  • Status: Active Grant
First Claim
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1. An antenna system for a radio-frequency identification (RFID) tag that includes an integrated circuit (IC), comprising:

  • an antenna substrate having a proximal end arranged adjacent the IC, and a distal end;

    a first serpentine antenna element formed on the antenna substrate and having a proximal end electrically connected to the IC;

    a second antenna element running in the same direction from the IC as the first serpentine antenna element and having a proximal end connected to the IC, the second antenna element comprising at least one of a second serpentine antenna element formed on the antenna substrate element and a conducting wire;

    a shunt electrically connected to first serpentine antenna element and to the second antenna element, the shunt configured to facilitate impedance matching between the antenna system and the IC; and

    wherein, when the second antenna element comprises said second serpentine antenna element, further including an impedance-matching circuit electrically connected to at least one of the first and second serpentine antenna elements.

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