In this letter, a compact high-efficiency broadband microwave rectifier with an extended range of input power is proposed for energy harvesting. In the proposed structure, a novel broadband impedance-matching network is employed to reach high radio frequency (RF) to dc conversion efficiency. The reduction in mismatching loss over a wide bandwidth and input power range is achieved by impedance transformation from three segments of microstrip lines, which leads to a compact design to realize broadband impedance matching. A theoretical analysis and simulations of the proposed rectifier are presented. For validation, a broadband rectifier operating between 2.1 and 3.3 GHz is implemented and tested. The proposed rectifier shows a bandwidth of 44.4% for efficiency over 70% at an input power of 14 dBm. The measured efficiency remains above 50% from 2 to 3.3 GHz with an input power from 4 to 16 dBm. Moreover, the proposed rectifier has a compact size of 31 mm $\times18$ mm.

中文翻译：

---

具有宽动态输入功率范围的紧凑型高效宽带整流器，用于能量收集

在这封信中，我们提出了一种具有扩展输入功率范围的紧凑型高效宽带微波整流器，用于能量收集。在所提出的结构中，采用了一种新颖的宽带阻抗匹配网络来实现高射频 (RF) 到直流转换效率。通过三段微带线的阻抗变换，在较宽的带宽和输入功率范围内降低失配损耗，从而实现紧凑的设计以实现宽带阻抗匹配。提出了所提出的整流器的理论分析和仿真。为了验证，我们实施并测试了一个在 2.1 至 3.3 GHz 之间运行的宽带整流器。建议的整流器在 14 dBm 的输入功率下显示 44.4% 的带宽，效率超过 70%。测得的效率在 2 至 3.3 GHz 范围内保持在 50% 以上，输入功率为 4 至 16 dBm。此外，所提出的整流器具有 31 mm $\times18 $ mm 的紧凑尺寸。