一种新型双频宽负载整流电路

A New Dual-Frequency Wide-Load Rectifier Circuit

提出一种新型双频宽负载整流电路,它能有效回收环境中的微波电磁能量。该整流电路主要由阻抗压缩匹配网络、肖特基二极管和低通滤波器构成。其中,阻抗压缩匹配网络由一个L型阻抗调节器和一个Π型阻抗匹配器组成,该网络能够在200~4000Ω的负载区间内减小输入阻抗的变化范围,从而提高整流电路的匹配性能。ADS 2017软件仿真结果显示,该整流电路在0.8 GHz和2.4 GHz的RF-DC转换效率最高,分别能达到81.2%和77.8%,转换效率大于50%的输入功率范围在两个频点处分别为17.8 dBm和14.2 dBm,且都可在宽负载(200~4000Ω)范围内实现较高的转换效率,实测结果与仿真结果基本吻合,进一步验证了本文设计的可行性。该整流电路具有结构简单、双频、宽负载、宽输入功率等特性,对物联网、无线传感器网络和射频标签等领域的无线能量传输有一定的实用价值。

A new type of dual-bandwidth load rectifier circuit is proposed to be effectively applied to the recovery of microwave electromagnetic energy in the environment. The rectifier circuit is mainly composed of an impedance compression matching network, a Schottky diode and a low pass filter. Among them, the impedance compression matching network consists of an L-type impedance adjuster and a Π-type impedance matcher. The network can reduce the variation range of input impedance over a wide load range, thus the matching performance is improved and the wide load performance of the rectifier circuit is realized. ADS 2017 software simulation results show that the highest RF-DC conversion efficiency of the rectifier circuit at 0.8 GHz and 2.4 GHz can reach 81.2% and 77.8%, respectively. The input power range with conversion efficiency greater than 50% is 17.8 dBm and 14.2 dBm respectively, and both can achieve higher conversion efficiency in a wide load range(200~4000 Ω). The measured results are basically consistent with the simulation results, which further verify the feasibility of the design in this article. The rectifier circuit has the characteristics of simple structure, dual frequency, wide load, wide input power, etc., and has certain practical reference value for wireless energy transmission applications in the Internet of Things, wireless sensor networks, and radio frequency tags.