一种用于微波无线能量传输的S波段圆极化整流天线设计  

Design of an S-Band circular polarized rectenna applied to microwave wireless power transmission

作　　者：李勋勇 许立强 余泽 刘长军[1] LI Xunyong;XU Liqiang;YU Ze;LIU Changjun(School of Electronics and Information Engineering,Sichuan University,Chengdu 610064,China)

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《应用科技》2021年第1期55-59,共5页Applied Science and Technology

基　　金：国家自然科学基金项目(61931009)。

摘　　要：在针对移动目标的微波输能(wireless power transmission,WPT)系统中,适应移动目标方位变化是急需解决的问题。圆极化微波整流天线可以减小或避免极化失配对微波输能效率的影响。本文提出了一款新型共面带线(coplanar stripline,CPS)结构的高效微波整流电路,与一对金属交叉偶极子直接连接,组成S波段圆极化整流天线。该整流天线结构紧凑,避免了同轴和微带结构,提高接收整流效率。实验结果表明:在2.45 GHz,圆极化天线|S11|为-13 dB,轴比为1.76 dB,半功率波瓣宽度为85.6°;整流电路在输入功率为16.3 dBm和负载250Ω时,效率达到了71.6%。该整流天线具有低成本、圆极化、易组阵等优点,在移动目标WPT领域具有应用潜力。In microwave wireless power transmission(WPT)systems for moving object,one of the problems to be urgently solved is to adapt to azimuthal angle variation of a moving object.Circular polarization rectenna is an efficient way to reduce or avoid the polarization mismatch in a WPT system.A novel high-efficiency rectifier based on coplanar strips(CPS)is presented.It connects a pair of crossed metal dipoles,forming a circular polarized antenna of S-band.No microstrip or coaxial interface is used,which leads to a facilitated structure with high conversion efficiency.The experiments show that the circular polarized antenna’s|S11|is−13 dB at 2.45 GHz with an axial ratio of 1.76 dB.Its half power lobe width is 85.6°.The rectification circuit has an efficiency of 71.6%with the input power of 16.3 dBm and the load of 250Ω.The rectenna has advantages of low cost,circular polarization,and easy array forming.It has potential applications in WPT systems for moving objects.

关 键 词：微波无线能量传输 交叉偶极子 圆极化 整流天线 巴伦 CPS传输线 肖特基二极管 整流效率 

分 类 号：TN828.5[电子电信—信息与通信工程]