METHOD AND APPARATUS FOR RADIOFREQUENCY IDENTIFICATION TAGS

摘要

PROBLEM TO BE SOLVED: To determine the identification number or any other information within a plurality of radiofrequency tags within a common field of interrogation.

SOLUTION: Combination of an isolation states into which tags 10 may be placed together with bitwise interrogation of information followed by selective deactivation or the identification number is utilized. A first bit in the identification number or the information is interrogated of all the tags 10 in the field. If any tag 10 responds that the bit is a 1, a 1 is entered into an ID register 48 in a reader 14 and all tags 10 in which a 0 exists in that bit position are deactivated. The process continues until only one tag remains activated. The last activated tag 10 at this point has been completely read and is then placed in an isolated state. The process is begun anew with the remaining nonisolated tags 10 until all tags 10 have been read.

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