Apparatus and method for identifying multiple transponders

Details Apparatus and method for identifying multiple transponders Apparatus and method for identifying multiple transponders

H - Electricity

04

B

H04B 7/26 (2006.01) G06K 7/00 (2006.01)

Patent

CA 2153120

Apparatus and method of identifying a plurality of transponders (10-16) entering into an inquiry field (18) of an interrogation unit (20) are provided. The transponders (10-16) are each assigned a unique identification code. Upon receipt of an interrogation pulse from the interrogation unit (20), each transponder (10-16) responds with its respective identification code. Depending on the spatial distance of each transponder (10-16) with respect to the interrogation unit (20), the interrogation unit (20) detects and receives the strongest response. The received identification code is stored. The interrogation unit (20) repeatedly sends interrogation pulses containing any stored identification code until all of the transponders (10-16) are identified and read.

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