A compact rectenna using split ring resonator for energy harvesting

In this paper, a rectifying antenna circuit based on the concept of electrically small resonator is reported. To verify the concept, it is designed, simulated, and also tested to harvest electromagnetic energy at 3.1 GHz. It is observed through measurements that the proposed circuit is able to transfer 18% of the RF incident power into DC power. The DC output power and RF-to-DC efficiency are investigated with respect to frequency, and also the angular position of the rectenna system.