A novel waveguide-integrated rectenna with high conversion efficiency is proposed and implemented at 35 GHz in this letter. A metallic Fabry–Perot resonator antenna is designed as the receiving antenna. Using the metallic structure instead of the microstrip structure that is widely used in the conventional rectenna design, the dielectric loss is avoided and a high radiation efficiency of 95.5% is achieved at 35 GHz. The rectifier is designed with a shielded microstrip line and fed with a rectangular waveguide to lower its radiation loss and insertion loss. At 35 GHz, a rectifying efficiency of 67% is measured for the waveguide-fed cavity rectifier. By integrating the receiving antenna and the rectifier with the rectangular waveguide, a waveguide-integrated 35-GHz rectenna is proposed for the first time. A prototype is fabricated and measured. The measured highest RF-to-dc conversion efficiency is 68.5% at 35 GHz when the power density is 39.3 mW/cm2.

中文翻译：

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具有高转换效率的金属波导集成 35GHz 整流天线

在这封信中，提出并实现了一种具有高转换效率的新型波导集成整流天线，频率为 35 GHz。金属法布里-珀罗谐振器天线被设计为接收天线。使用金属结构代替传统整流天线设计中广泛使用的微带结构，避免了介质损耗，在35GHz下实现了95.5%的高辐射效率。整流器采用屏蔽微带线设计，并采用矩形波导馈电，以降低其辐射损耗和插入损耗。在 35 GHz 下，波导馈电腔整流器的整流效率测得为 67%。通过将接收天线和整流器与矩形波导集成，首次提出了波导集成的35GHz整流天线。制造和测量原型。