Abstract: A communication apparatus comprises a communication path capable of conveying communication signals, a communication device adapted to receive or generate VHF or LTHF communication signals, and a near field antenna associated with the communication device. The near field antenna is provided sufficiently near to the communication path to couple VHF or UHF communication signals to or from the communication device to the communication path. A HID/IPT system and a communication method are also provided.

Abstract: A pick-up is provided for an Inductively Coupled Power Transfer (ICPT) system having a parallel tuned resonant pick-up circuit. The pick-up has a plurality of independently controllable power supply outputs. This allows a first output to supply a high voltage load (e.g. 300V-550V) and one or more additional outputs for supplying other loads such as control circuitry which may only require 24V. The one or more additional outputs may be supplied via a current transformer connected in series with the resonant pick-up circuit. Control for each output may be achieved by partially or completely decoupling the pick-up from a primary conductive path of the ICPT system.

Abstract: Power taken inductively from the alternating current in a track is received by a resonant circuit which is output controlled by a switching circuit asynchronous with the frequency of the power supply. The switch on and off time is controlled to regulate the output power and the circuit is such that on light loads the resonant circuit decouples from the track.