Tagtec Limited

Kenneth John Lang

Charles Robert Sims

Howard William Whitesmith

Richard Lew Davies

Stephen Russell Taylor

Andrew Jon Fell

An RFID tag () and similar control/sensing unit () for a communications system are described. The control/sensing unit has a control element () having one or more states, and include an antenna () as well as an electrical circuit (-) generating a pulse control signal for controlling transmission from the antenna and varying a parameter of the pulse control signal in dependence on the state of the control element (). Also disclosed is a receiving communication unit in the form of a base unit or system controller for such a communications system, the unit including a receiver () for receiving a pulsed RF signal and an electrical circuit (-) for detecting a parameter of the pulsed RF signal. An output circuit () then produces an output control signal dependent on the detected parameter of the pulsed RF signal.

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Wilts, United Kingdom

Kenneth John Lang