A compact rectenna with a wide input power range is proposed for wireless power transfer (WPT). Two different diodes, having distinct operating powers, i.e., high-input-power diode and low-input-power diode, are introduced to the rectenna design for extending the operating input power range. A mid-inductor is placed in the rectifying circuit to isolate the radio frequency (RF) signal from dc power, thereby delivering the rectified dc power to the load. Also, with the aid of mid-inductor, the fundamental RF signal and harmonic signals could flow back to the two rectifying diodes for achieving higher conversion efficiency via the means of harmonic signal re-rectification. Owing to the mid-inductor, the sub-rectifier circuit can be avoided, and a compact structure can therefore be realized. Over 50% measured conversion efficiency, ηc can be achieved in a very wide input power range of 35 dB (−10 to 25 dBm). The proposed rectenna can be widely used in WPT systems with unpredictable and variable RF energy levels.

中文翻译：

---

用于无线功率传输的具有宽输入功率范围的紧凑型整流天线设计

具有宽输入功率范围的紧凑型整流天线被提议用于无线功率传输 (WPT)。两种不同的二极管，具有不同的工作功率，即高输入功率二极管和低输入功率二极管，被引入到整流天线设计中以扩展工作输入功率范围。整流电路中放置了一个中间电感器，以将射频 (RF) 信号与直流电源隔离，从而将整流后的直流电源传送到负载。此外，借助中置电感，基波射频信号和谐波信号可以回流到两个整流二极管，通过谐波信号再整流的方式实现更高的转换效率。由于采用中间电感，可以省去副整流电路，从而实现紧凑的结构。超过 50% 的测量转换效率，ηc 可以在 35 dB（-10 至 25 dBm）的非常宽的输入功率范围内实现。所提出的整流天线可广泛用于具有不可预测和可变射频能量水平的 WPT 系统。