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RFID tag including environmentally sensitive materials

  • US 9,092,709 B2
  • Filed: 08/25/2010
  • Issued: 07/28/2015
  • Est. Priority Date: 08/25/2010
  • Status: Active Grant
First Claim
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1. An RFID device, comprising:

  • a substrate;

    an antenna structure having a first sheet of electrically conductive material including two parts and an elongated slot extending therebetween, the elongated slot having a length and one open end;

    a wireless communications device coupled to the substrate; and

    a non-ambient environmentally responsive material deposited within or across a portion of the elongated slot wherein the material alters the level of interaction between the two parts of the antenna structure in response to a change in an environmental factor and wherein the interaction between the two parts of the antenna varies along a length of the slot.

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