Tagtec Limited

Alan Edward Ball

Howard William Whitesmith

A system is disclosed for monitoring the position of one or more RFID tags . The system has a detector incorporating circuitry for detecting changes in the range of an RFID tag from the detector and for triggering an alarm if a detected change in range of an RFID tag exceeds a predetermined threshold or if the RFID radio tag cannot be detected by the detector . Range may be detected, for example, by measuring the time of a returned radio signal from a tag , by measuring the strength of a returned radio signal from a tag, or by detecting changes in a periodic interval at which energy is transmitted by a tag.

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Cambridgeshire, United Kingdom

Alan Edward Ball