具有谐波抑制功能的共面波导轻薄整流天线

Light weight rectenna fed by CPW with function of harmonic suppression

为解决对无人机、平流层飞艇等空中移动目标无线输能时机载接收端整流天线质量大,占居飞行器有效载荷多的难题,设计了一种具有谐波抑制功能的共面波导轻薄圆极化整流天线。该整流天线采用集中式整流方式,通过将整流电路直接集成在微带天线接地板上,实现了质量轻,尺寸小,剖面低,易共形的圆极化整流天线。该天线工作在5.8GHz,采用共面波导耦合馈电,并在馈线上直接加载共面波导谐振结构进行谐波抑制,具有较宽的工作带宽。整流电路采用倍压整流形式,利用贴片电容作为直通滤波器进行直流滤波,电路结构简单。该整流天线结构紧凑,质量仅6.28g,剖面厚度0.5mm,最佳整流效率63.84%,测试结果与仿真结果吻合良好,验证了该设计的可行性。

A novel circularly polarized rectenna with function of harmonic suppression is designed.The rectifier is directly integrated on the ground plane of the receiving antenna.The circularly polarized rectenna has the characteristics of light weight,compact size,low profile,and is easy to be conformed with the surface of aero-crafts.The rectenna works at 5.8 GHz and is fed by Coplanar Waveguide(CPW)coupling,which results in a broad working bandwidth.A Compact CPW Resonant Cell(CCRC)is directly loaded into the feeding to suppress the high order harmonics.The designed rectifier circuit adopts voltage doubling,and uses two chip capacitors for DC filtering and has a simple structure.The proposed rectenna has a compact structure and a 0.5 mm thick profile.Furthermore,the mass of the proposed design is only 6.28 g and the optimum rectification efficiency is 63.84%.The test results are in good agreement with the simulation results,which verifies the feasibility of the design.