Review on Power Conversion Efficiency Improvement Strategies in RF Energy Harvesting

In RF energy harvesting, the energy received from electromagnetic waves is converted into useful dc power. The paper aims to review the present strategies for analyzing power conversion efficiency. Several parameters are needed to be evaluated for the power conversion efficiency measurement. Based on the types of functional units, different strategies are analyzed. This review suggests that the gain of the receiver antenna plays a critical role in the RF energy harvesting system. The power conversion efficiency (PCE) has been obtained in RF harvesting systems is ranging from 20% to 82.3%. The overall PCE depends on efficiency of each block.