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 2153121

Apparatus and method for identifying a plurality of transponders (10-16) located within an inquiry field (18) of an interrogation unit (20) are provided. Each transponder (10-16) is assigned an unique identification code, and the interrogation unit (20) dynamically constructs and modifies a bit string used to solicit responses from selected transponder(s) until each transponder (10-16) in the inquiry field (18) is identified. The bit string is transmitted to the transponders, which compares it with the least significant bits of their respective identification codes. A mismatch between the identification code and the bit string results in suppressing the response from the transponder.

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