基于吸收式频率选择反射结构的波导缝隙阵列天线RCS缩减设计  

Study of Absorbing Frequency Selective Reflective Hypersurface in the Reduction of Radar Cross Section of Waveguide Slot Array Antenna

作　　者：孙东伟 钟硕敏 SUN Dong-wei;ZHONG Shuo-min(Institute of Information Science and Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学信息科学与工程学院,宁波315211

出　　处：《无线通信技术》2022年第3期29-34,共6页Wireless Communication Technology

摘　　要：本文提出了一种具有吸收式频率选择反射(AFSR, absorption frequency selective reflection)特性的超材料结构,可用于降低波导缝隙阵列天线带外和带内结构模式的雷达散射截面(RCS)。该结构厚度仅为0.16λ,吸收性能主要归功于中间层上表面集总电阻,吸波率最高可达99%以上,带内反射损耗小于1dB,从而保证天线辐射性能不受影响。将其加载到波导缝隙阵列天线的金属表面上,同时与辐射缝隙保持一定的距离,仿真结果表明加载该结构后波导缝隙阵列天线的反射系数、方向性和波瓣宽度基本保持不变,工作频带为8.87GHz-9.03GHz,在中心频率8.96GHz处增益提高了3.47dBi。In this paper, a metamaterial structure with the characteristic of absorption frequency selective reflection(AFSR) is proposed, which can be used to reduce the radar cross section(RCS) of waveguide gap array antennas with out-of-band and in-band structure modes.The thickness of the structure is only 0.16λ, and the absorption performance is mainly attributed to the lumped resistance on the upper surface of the intermediate layer. The highest absorption rate can reach more than 99%, and the in-band reflection loss is less than 1 dB, so as to ensure that the radiation performance of the antenna is not affected.The structure is loaded onto the metal surface of the waveguide gap array antenna, while keeping a certain distance from the radiation gap. The simulation results show that the reflection coefficient, directivity and lobe width of the waveguide gap array antenna remain unchanged after loading the structure, and the operating frequency band is 8.87 Ghz-9.03 Ghz.The gain is increased by 3.47 dBi at the center frequency 8.96 GHz.

关 键 词：AFSR结构 超材料 波导缝隙阵列天线 雷达散射截面 

分 类 号：TN92[电子电信—通信与信息系统]