A kind of dual?frequency low?input?power microwave rectifying circuit based on micro?strip structure and operating at 1.8 GHz and 2.5 GHz was proposed in this paper,it may be effectively used for recovering the ambient microwave electromagnetic energy. The rectifying circuit mainly consists of a zero?barrier Schottky diode HSMS?2852 and a cross stub of matching circuit,the cross stub realizes impedance match at dual frequencies. Moreover, it works as an input bandpass filter and can effectively restrain the second harmonics. The simulation results show that, when the input power was 0 dBm, the MW?DC conversion efficiencies of the rectifying circuit operating at 1.8 GHz and 2.5 GHz were respectively 62% and 52%. The actually measured results display that the MW?DC con?version efficiencies of the circuit at 1.76 GHz and 2.53 GHz were the highest, which were respectively 52% and 46%.%提出一种工作在1.8 GHz和2.5 GHz的双频低输入功率微带微波整流电路,它能有效地应用于周围环境中的微波电磁能量回收.该整流电路主要由一个零势垒肖特基二极管HSMS?2852和十字型匹配支节组成.匹配支节实现了二极管的双频阻抗匹配,同时作为输入带通滤波器能有效抑制二次谐波.仿真结果表明:输入功率为0 dBm时,整流电路工作在1.8 GHz和2.5 GHz的射频-直流(MW?DC)转换效率分别为62%和52%.实测结果显示,在1.76 GHz 和2.53 GHz频率上电路有最高MW?DC转换效率,分别为52%和46%.
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