Modelling and simulation of low cost RF energy harvesting system

In this paper, we have presented modelling and simulation of a system to harvest electrical energy from ambient radio frequency signals. We assume that the radio frequency signal is of amplitude modulation type as if it is being broadcasted from a local medium wave radio transmitting station. In the proposed model, a voltage source is used as the equivalent of a ferrite core receiving antenna, which is then followed by a matching circuit, a step up transformer and a rectifier to obtain the direct current output. Simulation results have shown that the efficiency of the proposed model varies with a load resistance of the rectifier circuit.