Multi-protocol RFID system
First Claim
1. An interrogator system to read active Radio Frequency Identification (RFID) transponders and backscatter RFID transponders at a single monitoring location comprising:
- first and second antennas,wherein said system is configured to establish a tag communication signal sequence, said signal sequence comprising first, second, third and fourth sequence portions,said signal sequence being arranged to enable said system to;
read a first active RFID transponder during said first sequence portion,read a second active RFID transponder during said second sequence portion, andread a third active RFID transponder during said third sequence portion,wherein communication with at least two backscatter RFID transponders during said fourth sequence portion via said first and second antennas overlaps in time.
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Accused Products
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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Citations
20 Claims
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1. An interrogator system to read active Radio Frequency Identification (RFID) transponders and backscatter RFID transponders at a single monitoring location comprising:
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first and second antennas, wherein said system is configured to establish a tag communication signal sequence, said signal sequence comprising first, second, third and fourth sequence portions, said signal sequence being arranged to enable said system to; read a first active RFID transponder during said first sequence portion, read a second active RFID transponder during said second sequence portion, and read a third active RFID transponder during said third sequence portion, wherein communication with at least two backscatter RFID transponders during said fourth sequence portion via said first and second antennas overlaps in time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An interrogator system to read active radio frequency identification (RFID) transponders and backscatter RFID transponders at a single monitoring location comprising:
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at least two antennas, wherein said system is configured to establish a tag communication signal sequence, said signal sequence comprising first, second, and third sequence portions, wherein said signal sequence is arranged to enable said system to; read a first active RFID transponder during said first sequence portion, read active second RFID transponder during a second sequence portion, and communicate with at least two backscatter transponders during said third sequence portion via said at least two antennas, wherein the communicating with each of the at least two backscatter transponders overlaps in time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An interrogator system to read active radio frequency identification (RFID) transponders and backscatter RFID transponders at a single monitoring location comprising:
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an interrogator system comprising at least two antennas, wherein the interrogator system is configured to establish a tag communication signal sequence, said signal sequence comprising first, second, third and fourth sequence portions, wherein said signal sequence is arranged to enable said interrogator system to; read at least one active RFID transponder during said first sequence portion, read at least one active RFID transponder during a second sequence portion, read at least one active RFID transponder during said third sequence portion, and communicate with at least two backscatter transponders during said fourth sequence portion via said at least two antennas, wherein the communicating with each of the at least two backscatter transponders overlaps in time.
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Specification