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在基于电磁辐射的无线能量传输与获取技术中,如何准确获取肖特基二极管的最优工作状态一直是国内外的研究热点。本文针对已有相关研究的不足,提出了一种基于Advanced Design System(ADS)电路仿真软件获取微波整流电路中整流二极管阻抗的方法。该方法基于单管并联整流电路的理想模型,通过“阻抗获取-阻抗匹配”的迭代过程,得到该电路结构下对应于最优整流性能时的二极管阻抗收敛值。该方法操作流程简明,计算量较小,结果较准确。根据该收敛阻抗,本文设计了一种单管并联验证电路,把输入滤波器和直流滤波器共有的高次谐波抑制部分整合到二极管支路,使得整体结构更为紧凑,总体插入损耗更小。实测结果与仿真结果较为吻合,在输入功率为8.3 d Bm,直流负载为1300Ω时,电路实测输出电压为2.469 V,整流效率可达69.36%,在输入功率为-1.6~11.4 d Bm的范围内,整流效率均在50%以上。
In the wireless energy transmission and acquisition technology based on electromagnetic radiation, how to accurately obtain the optimal working state of the Schottky diode has always been a research hotspot at home and abroad. In this paper, aiming at the shortcomings of existing researches, a method based on Advanced Design System (ADS) circuit simulation software to obtain the rectifier diode impedance in microwave rectification circuit is proposed. The method is based on the ideal model of single-tube parallel rectification circuit and obtains the diode impedance convergence value corresponding to the optimal rectification performance of the circuit structure through the iterative process of “impedance acquisition-impedance matching”. The method has the advantages of concise operation flow, smaller calculation amount and more accurate result. According to the convergence impedance, a single-tube parallel verification circuit is designed in this paper, which integrates the harmonic suppression part common to the input filter and the DC filter into the diode branch, so that the overall structure is more compact and the overall insertion loss is smaller . The measured results agree well with the simulation results. When the input power is 8.3 d Bm and the DC load is 1300Ω, the measured output voltage of the circuit is 2.469 V and the rectification efficiency can reach 69.36%. With the input power of -1.6 ~ 11.4 d Bm , Rectification efficiency are more than 50%.