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RFID printer and antennas

  • US 7,439,861 B2
  • Filed: 04/23/2007
  • Issued: 10/21/2008
  • Est. Priority Date: 06/22/2004
  • Status: Active Grant
First Claim
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1. A printer for printing on a longitudinally extending web of record members having RFID transponders disposed at spaced locations along the length of the web, the printer comprising:

  • a print head capable of printing on the web,a web path for the web extending in a downstream direction to the print head,a write and/or read loop antenna disposed along the web path upstream of the print head, the antenna having opposite sides, wherein one side of the antenna faces in the upstream direction and the other side of the antenna faces in the downstream direction, the antenna having a conductor arranged in a loop, one loop portion of the conductor of the loop antenna being disposed adjacent the web path and another loop antenna portion of the conductor being disposed away from the web path, wherein the antenna writes to only the transponder adjacent the one loop portion without affecting any transponder upstream or downstream of the adjacent transponder.

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