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RFID conveyor system

  • US 7,518,513 B2
  • Filed: 03/23/2006
  • Issued: 04/14/2009
  • Est. Priority Date: 03/29/2005
  • Status: Active Grant
First Claim
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1. A conveyor system for processing items on which radio frequency identification tags are disposed, said system comprising:

  • a frame;

    a conveyor that is disposed movably on the frame and that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon;

    an antenna disposed on the frame with respect to the path of travel so that the antenna radiates radio frequency signals into a first area through which the items pass,wherein the antenna comprises a substrate and a plurality of patch elements disposed on the substrate in respective positions that are sequential with respect to a direction transverse to the path of travel,wherein electric current at each said patch element drives radiation of the radio frequency signals and defines a rotating electric current pattern, andwherein respective rotational directions of the electric current pattern at two said patch elements are opposite to each other; and

    a radio frequency transmitter that drives the antenna to emit the radio frequency signals into the first area.

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