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提出了一种具有部分反射特性和吸波特性的共享孔径人工电磁媒质(shared aperture metamaterial,SA-MTM).该媒质由上层斜十字金属图案加载集总电阻的吸波表面、下层开条带缝隙金属面的部分反射表面以及中间介质层构成,吸波表面和部分反射表面在垂直维度上共享了一个物理孔径使该媒质同时实现了吸波特性和部分反射特性.将SA-MTM与天线一体化设计,利用SA-MTM的部分反射表面和天线表面构成的法布里-珀罗(Fabry-Perot,F-P)谐振腔提升天线的增益,利用SA-MTM的吸波表面吸收入射电磁波实现低雷达散射截面(radar section cross,RCS)天线的设计.仿真和实验结果表明,SA-MTM的加载使天线的前向增益在5.57—5.94 GHz的工作带宽范围内都提升了3 d B以上,且天线的后向RCS在2—9 GHz范围内都有明显的减缩.该研究成果克服了天线辐射性能和散射性能无法兼顾的矛盾,对高增益低RCS天线的设计具有重要的指导意义.
A shared aperture metamaterial (SA-MTM) with partially reflective and absorbing properties is proposed. The medium is loaded with the absorbing surface of the lumped resistor from the upper cross-shaped cross metal pattern, The partially reflective surface of the gap metal surface and the intermediate dielectric layer, the absorbing surface and the partially reflecting surface share a physical aperture in a vertical dimension, so that the medium achieves both the absorbing property and the partially reflecting property at the same time. The integrated design utilizes the Fabry-Perot (FP) resonator consisting of the partially reflective surface of the SA-MTM and the antenna surface to enhance the gain of the antenna. The SA-MTM absorbing surface absorbs incident electromagnetic waves to achieve low The design of the radar section cross (RCS) antenna is simulated and the experimental results show that the SA-MTM loading increases the forward gain of the antenna more than 3 dB over the working bandwidth of 5.57-5.94 GHz, and The backward RCS of the antenna is significantly reduced in the range of 2-9 GHz.The research results overcome the contradiction between the radiative and scattering properties of the antenna and the design of high gain and low RCS antenna There are important guiding significance.