Abstract: An inventory system is provided herein, comprising a first inventory system unit and a second inventory system unit. The first inventory system unit comprises at least a configuration transmitter to generate a configuration field inside a first field zone to configure one or more UHF RFID tags within said first field zone into a configured state deviating from a default state. The second inventory system unit therein comprises at least an interrogation transceiver to generate an interrogation field inside a second field zone that is at least partly outside said first field zone to subsequently interrogate a set of one or more UHF RFID tags that are within said second field zone and that are in the configured state as a result of being configured by the configuration transmitter.

Abstract: A UHF RFID system is disclosed in which an RFID transponder or tag can be simultaneously powered and interrogated by multiple RFID transceivers. The architecture of the system is such that each transceiver generates its own carrier wave, with a frequency that might be equal to or different from the other units, and the interrogation data is distributed throughout a network of transceivers and modulated by each transceiver unit onto their own carrier waves. During an interrogation period, one or more of the transceivers will be configured as the master unit, generating and distributing the protocols commands. The other units can be configured as transmitters, receivers or transceivers. After each period the units may be given different roles. The proposed setup yields a system with the capability to power and interrogate RFID tags with multiple readers, without compromising the required modulation depth and protocol handling.

Abstract: A UHF RFID system is disclosed in which an RFID transponder or tag can be simultaneously powered and interrogated by multiple RFID transceivers. The architecture of the system is such that each transceiver generates its own carrier wave, with a frequency that might be equal to or different from the other units, and the interrogation data is distributed throughout a network of transceivers and modulated by each transceiver unit onto their own carrier waves. During an interrogation period, one or more of the transceivers will be configured as the master unit, generating and distributing the protocols commands. The other units can be configured as transmitters, receivers or transceivers. After each period the units may be given different roles. The proposed setup yields a system with the capability to power and interrogate RFID tags with multiple readers, without compromising the required modulation depth and protocol handling.