Dual-Band Rectifier Design for Ambient RF Energy Harvesting

Abstract

The design of a wireless sensor network (WSN) has several key points to consider. Power management and battery charging, especially when is applied in a harsh environment, are crucial parameters. In this paper, we present an RF energy harvesting system that converts ambient AC electromagnetic energy into DC voltage, which is applicable to supply low power devices. The circuit harvests and reuses ambient wireless energy for several applications. The proposed system resonates in the frequency bands of 4G (2.67 GHz) and 5G (3.591 GHz) mobile communication systems. Numerical results demonstrate that the overall system in a two-tone signal exhibits maximum power conversion efficiency equal to 78.1%, when the load of the circuit is 2 kOhms and the input power reaches 6 dBm. In a single-tone configuration, the maximum achieved efficiency is 56.11% at 2.67 GHz and 57.95% at 3.591 GHz, accordingly.