Security Monitoring System

摘要

An RFID transceiver tag is proposed for use in a monitoring system for detecting a change in position of the tag relative to an associated RFID tag or to the environment surrounding or between the tags. The transceiver tag has a detector for detecting a characteristic of a signal transmitted between the transceiver tag and the associated RFID tag and for creating a trigger signal if the detector detects that the characteristic has changed beyond a predetermined extent; and a transmitter for transmitting a signal to a remote controller on receipt of the trigger signal from the detector.