RADIO FREQUENCY IDENTIFICATION TRANSPONDER

摘要

PROBLEM TO BE SOLVED: To provide a radio frequency identification transponder provided with a power supply and a dynamic memory array which stores data.

SOLUTION: When power from the power supply ceases, the data in the dynamic memory array is validly maintained for a predetermined period of time. The dynamic memory array is responsive to an interrogating signal for selectively updating the data. Further claimed is a radio frequency identification transponder wherein a signal processor extracts an identifier from the interrogation signal and is responsive to the identifier and the stored data to determine whether some or all of the identifiers is stored in the dynamic memory array. Further claimed is a system wherein a transmitter provides a plurality of temporally spaced interrogating signals.

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