Method and apparatus for focusing an rfid reader to avoid...

Details Method and apparatus for focusing an rfid reader to avoid... Method and apparatus for focusing an rfid reader to avoid...

G - Physics

01

V

G01V 3/12 (2006.01) H01Q 3/26 (2006.01)

Patent

CA 2522449

A reader for radio frequency identification tags, and a method for narrowing the electromagnetic field of tags passing before the reader, the reader having: at least one main antenna emitting an electro-magnetic field; counter coil antennas located adjacent to said at least one main antenna, each the at least one main antenna being disposed between two of the counter coil antennas, the counter coil antennas emitting an electromagnetic field opposite in polarity to the electro-magnetic field of the main antenna, wherein the configuration of the at least one main antenna and the counter coil antennas narrows an enabling electromagnetic field experienced by radio frequency identification tags in front of the reader. Multiple readers are possible with synchronization of the clocks of the readers to avoid interference.

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