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EAS and UHF combination tag

  • US 8,026,818 B2
  • Filed: 12/13/2007
  • Issued: 09/27/2011
  • Est. Priority Date: 12/20/2006
  • Status: Active Grant
First Claim
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1. A security tag comprising:

  • an electronic article surveillance (EAS) element, said EAS element comprising a resonant circuit formed of a coil and a capacitor, said coil comprising a first extension, constituting a first capacitor plate, on a first side of said coil and a second extension on a second side, opposite to said first side, of said coil, said second extension comprising a pair of elements constituting a dipole antenna, said capacitor comprising a conductive layer, constituting a second capacitor plate, having one end electrically coupled to one end of said coil and wherein said conductive layer is disposed on top of said first extension with a dielectric layer disposed in between said conductive layer and said first extension; and

    an ultrahigh frequency (UHF) element, said UHF element comprising a loop antenna coupled to a radio frequency (RFID) integrated circuit, said loop antenna having a portion that coincides with said coil on said first side.

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