基于EBG吸波材料的波导缝隙天线设计  

Design of Slot Antenna Based on EBG Absorbing Metamaterial

作　　者：李振亚[1] 张建华[1] 

机构地区：[1]电子工程学院,安徽合肥230037

出　　处：《现代防御技术》2015年第6期153-157,203,共6页Modern Defence Technology

摘　　要：为了改善波导缝隙天线的散射性能，设计了一种电磁带隙（electromagnetic band gap，EBG）结构的吸波材料，从导纳圆图、表面电流和电场分布等方面分析了其吸波机理。其厚度为0．3mm，吸波率达到99．9％，将其加载于波导缝隙辐射金属基板上，得到了低雷达散射截面的波导缝隙天线。仿真结果表明：加载后的天线回波损耗和增益基本不变，在5．48～5．75GHz工作频带内，法向RCS减缩都在3dB以上，最大减缩达到15．8dB，单站RCS在-18°～18°角域减缩超过3dB。证实了该吸波结构有良好的吸波效果，可以用于波导缝隙天线带内隐身。In order to improve the scattering netic band gap（EBG） absorbing metamaterial is lyzed from admittance circle diagram and electric performance of waveguide slot antenna, an electromagdesigned, whose physical absorbing mechanism is anafield distribution, current distribution on patch and metallic ground plane. Its thickness is 0.3 mm and its absorption rate can be 99.9%. Low radar cross section waveguide slot antenna is obtained when it is loaded on the radiation metal. The simulated result shows that the loaded antenna can hardly influence antenna~ radiation performance, while the radar cross section （RCS） of the novel antenna in boresight direction is reduced by 3 dB, and the maximum reduc- tion exceeds 15.8 dB. the monstatic RCS reduction is over 3 dB from -18~ - ＋ 18~,which proves that the absorber has an excellent absorptivity and can be applied to slot antenna to achieve band stealth.

关 键 词：波导缝隙天线 电磁带隙 吸波材料 吸波机理 雷达散射截面 带内隐身 

分 类 号：TN82[电子电信—信息与通信工程]