In this letter, a compact high-efficiency radio frequency (RF) rectifier based on a series harmonic suppression structure is proposed for wireless power transmission (WPT). The proposed structure removes the cascading bandpass between the RF source and the diode, and the dc-pass filter between the diode and the dc load, simultaneously. The harmonic suppression structure consists only of a short-ended eighth-wavelength microstrip line, which shows an inductive impedance to compensate the rectifying diode’s capacitive impedance at fundamental frequency and changes to open circuit to reflect the second harmonic for rectifying again. Two Schottky diodes are used in this design for voltage-doubling rectifying. For fabrication, a rectifier operating at 2.45 GHz was designed, fabricated, and tested. The measurement results show that the maximum RF–dc conversion efficiency is over 80% at 25 dBm. Meanwhile, the fabricated rectifying is compact with 20 mm $\times \,\,{5}$ mm.

中文翻译：

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具有简单谐波抑制结构的紧凑型高效整流器

在这封信中，提出了一种基于串联谐波抑制结构的紧凑型高效射频 (RF) 整流器，用于无线电力传输 (WPT)。所提出的结构同时去除了射频源和二极管之间的级联带通以及二极管和直流负载之间的直流通滤波器。谐波抑制结构仅由短端的八分之一波长微带线组成，呈现感性阻抗补偿整流二极管在基频时的容性阻抗，并变为开路反射二次谐波进行再次整流。本设计中使用两个肖特基二极管进行倍压整流。在制造方面，设计、制造和测试了工作在 2.45 GHz 的整流器。测量结果表明，最大射频-直流转换效率在 25 dBm 时超过 80%。同时，制造的整流器紧凑，20 mm $\times \,\,{5}$ mm。