Multi-protocol or multi-command RFID system

Details Multi-protocol or multi-command RFID system Multi-protocol or multi-command RFID system

2004-07-09

2009-06-16

Zimmerman, Brian A (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S010200, C340S010400, C340S572100, C370S342000, C370S467000, C370S252000, C455S061000, C455S277100

Reexamination Certificate

active

07548153

ABSTRACT:
A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGO™ RFID backscatter transponders, SEGO™ RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference.

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