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Design of 2.45 GHz High-Efficiency Rectifying Circuit for Wireless RF Energy Collection System
Yanhu Huang1, Jiajun Liang1,2, Zhao Wu1
1Guangxi University Key Lab of Complex System Optimization and Big Data Processing, Guangxi Applied Mathematics Center, Yulin Normal University, Yulin 537000, China.
Abstract:
A 2.45 GHz high-efficiency rectifying circuit for a wireless radiofrequency (RF) energy collection system is proposed. The RF energy collection system is composed of a transmitting antenna, a receiving antenna, a rectifying circuit and a load. The designed receiving antenna is a kind of dual-polarised cross-dipole antenna; its bandwidth is 2.3-2.5 GHz and gain is 7.97 dBi. The proposed rectifying circuit adopts the technology of an output matching network, which can suppress the high-harmonic components. When the input power at 2.45 GHz is 13 dBm and the load is 2 kΩ, the highest conversion efficiency of RF-DC is 74.8%, and the corresponding maximum DC output voltage is 4.92 V. The experiment results are in good agreement with the simulation results, which shows a good application prospect.
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