基于二极管等效模型的2.45 GHz微波整流电路的设计

Design of a 2.45 GHz microwave rectifying circuit based on the diode equivalent model

摘要:

提出了一种提取二极管等效模型的方法，并基于该方法设计了微波整流电路. 文中首先根据软件自带HSMS-282C肖特基二极管的电路模型，设计、加工并测试了一款工作于2.45GHz的微波整流电路；然后根据测试结果优化了二极管等效模型的相关参数；最后用得到的等效模型替代二极管重新设计了整流电路. 其中，为了减少焊接产生的寄生参数对测试结果的影响，采用了阻抗阶跃微带线来设计低通滤波器. 实验结果表明，基于本文得到的二极管等效模型设计的微波整流电路，其仿真结果和测试数据可以良好地吻合. 在输入功率为20 dBm、负载为500 Ω时，整流电路实现了73.4%的转换效率.

Abstract:

This paper proposes a method to extract the equivalent circuit model of the diode and a microwave rectifying circuit is designed base on this method. Specifically, a rectifying circuit operating at the microwave frequency of 2.45 GHz is designed, fabricated and tested according to the diode model of HSMS282C in the component library first. Then, the equivalent model of the diode is optimized on the basis of the measured results. Finally, the rectifying circuit is redesigned with the obtained equivalent model. In addition, a microstrip step impedance lowpass filter is adopted, which is used to reduce the effects of the parasitic parameters on the tested results introduced by the welding. It is demonstrated that the measured and the simulated results of the rectifying circuit designed with the proposed method agree well with each other. The conversion efficiency of achieved 73.4% when the input power is 20 dBm and the DC load is 500 Ω