Wide Input Power Range X-Band Rectifier With Dynamic Capacitive Self-Compensation

• Published in: IEEE microwave and wireless components letters 2021-05, Vol.31 (5), p.525-528
• Main Authors: Lin, Hang, Chen, Xiaojie, He, Zhongqi, Xiao, Yuyang, Che, Wenquan, Liu, Changjun
• Format: Article
• Language: English
• Subjects: Compensation; Diodes; Dynamic range; Energy conversion efficiency; Imaginary impedance part; Impedance; Microwave circuits; Microwave filters; microwave rectifier; Power transmission lines; Rectifiers; Schottky diode; Schottky diodes; Self compensation; Transmission lines; Wireless power transmission
• ISSN: 1531-1309; 2771-957X; 1558-1764; 2771-9588
• DOI: 10.1109/LMWC.2021.3067068

A microwave rectifier composed of a pair of Schottky diodes with dynamic capacitive self-compensation is proposed in this letter. The impedance of a Schottky diode usually varies with the input power. A method using paired diodes for capacitive self-compensation is presented to enhance the rectifier's dynamic power range. The imaginary part of one diode's impedance is compensated using another identical diode with a section of transmission line by impedance transforming. The proposed method reduces the effect of the input power on the diode impedance. An X -band rectifier using a pair of HSMS-286 Schottky diodes based on the proposed method is designed and fabricated. This rectifier, with a dc load of 300~\Omega , achieves power conversion efficiency of 64.5% at 9.7 GHz and has a 15.3-dB input power dynamic range with efficiency exceeding 50%. The rectifier is expected to be used in wireless power transmission systems with flexible distance requirements.