Patent ID: 8314687
Filing Date: 2012-11-20
Classification: G06K,G07B,G08B

Abstract:
1. An interrogator system to read active RFID transponders and backscatter RFID transponders at a single monitoring location comprising: at least two transceivers, each transceiver covering a capture zone at said monitoring location wherein said system establishes a tag communication signal sequence, said signal sequence comprising first, second and third sequence portions, said signal sequence being arranged to enable said system to read at least one active RFID transponder in a first capture zone during said first sequence portion, to read at least one active RFID transponder in a second capture zone during said second sequence portion and to simultaneously read backscatter RFID transponders in both capture zones during said third sequence portion, said first and second sequence portions occurring at different times during said signal sequence and said third sequence portion occurring at a different time than said first and second sequence portions.