一款2.4GHz~2.5GHz的RF能量收集系统设计

Design of a 2.4GHz~2.5GHz RF Energy Collection System

近年来,为了达到控制环境的目的,无线传感器网络迅速兴起,但传感器节点的生命周期对电池容量有很大的依赖性。为解决无线传感器不可持续性供电的问题,设计一款收集环境频率在2.4GHz~2.5GHz的能量采集系统,主要由微带天线、阻抗匹配电路、四倍压整流电路组成。微带天线的设计采用天线阵列,提高了天线捕捉能量的灵敏度,天线打样样品实际测量在2.4GHz~2.5GHz整个频段内S11均小于-10dB。阻抗匹配电路设计简单,阻抗匹配电路ADS仿真在2.4GHz~2.5GHz整个频段内S11均小于-10dB。四倍压整流电路提高了RF-DC的转换效率,能使电压放大四倍输出。实验结果表明,2.4GHz~2.5GHz的RF能量收集系统达到了设计要求,可以有效收集环境中2.4GHz~2.5GHz频率内的能量,系统输出直流电压最大可达1.628V。

In recent years,in order to achieve the purpose of controlling the environment,wireless sensor networks are rapidly emerging,but the life cycle of sensor nodes has a great dependence on battery capacity.In order to solve the problem of unsustainable power supply for wireless sensors,an energy harvesting system with an environmental frequency of 2.4GHz~2.5 GHz is designed,which is mainly composed of a micro-strip antenna,an impedance matching circuit,and a quadruple voltage rectifier circuit.The design of the micro-strip antenna uses an antenna array,which improves the sensitivity of the antenna to capture energy.The actual measurement of the antenna sampling sample is less than-10dB in the entire frequency band of 2.4GHz~2.5GHz.The design of the impedance matching circuit is simple,and the ADS simulation of the impedance matching circuit is less than-10dB in the entire frequency band of 2.4GHz~2.5GHz.The quadruple voltage rectifier circuit improves the conversion efficiency of RF-DC,which makes the voltage amplification output four times.The experimental results show that the 2.4GHz~2.5GHz RF energy collection system meets the design requirements and can effectively collect energy in the environment at the frequency of 2.4GHz~2.5GHz.The system outputs a DC voltage of 1.628V.