Design of fractal loop antenna with integrated ground plane for RF energy harvesting

In this paper, we present a novel impedance matching method for loop antenna by integrating the in-loop ground plane (ILGP). Compact Koch fractal loop is designed for ambient radio frequency (RF) energy harvesting applications at GSM1800 band. Comparing to the conventional matching method for loop antenna, the proposed ILGP doesn't require any additional layout and can easily match the impedance to 50 Ohms. The in-loop ground plane makes antenna more compact and provides high total efficiency. The performance of the proposed antenna has been verified by simulation and measurements. It should be noted that the ILGP matching method is useful for various planar loop antennas utilized for different wireless communication applications.