Rf transmitter device and method for operating the same

The present invention is related to a radio frequency (RF) transmitter device arranged for supplying RF energy, characterised in that the RF transmitter device comprises reception means for receiving information on detected living beings and in that the RF transmitter device is arranged for adapting its transmit power according to said received information. The invention further relates to a method for adapting the transmit power of the RF transmitter device while it is supplying energy to a sensor network.