基于Hilbert分形结构,设计了一种小型化、超薄、高吸波率以及无表面损耗层的超材料吸波体,该吸波体单元尺寸仅为0. 071λ,厚度约0. 02λ,吸波率达99. 3% 。将该吸波体与普通微带天线共形设计,制备了一种新型超材料天线。与初始天线相比,新天线的单站和双站带内雷达散射截面都有明显减缩,最大减缩达到7. 2 dB,且天线辐射性能保持不变,证实了该吸波体具有良好的吸波效果。仿真和实测结果吻合得很好,表明该吸波体可以应用于微带天线的带内隐身。

A metamaterial absorber based on hilbert fractal structure is designed with miniaturization,slim, high absorptivity and no surface ullage layer. Its unit size is only 0. 071λ, the thickness is about 0. 02λand the absorber can exhibit absorption of 99. 3%. It is conformed on microstrip antenna to preparation of a novel metamaterial antenna. Compared with the conventional microstrip antenna, the proposed antenna has a obvious monstatic and bistatic radar cross section reduction at the working frequency band.the greatest decrement can amounted to 7. 2 dB,while the radiation performance is kept, which proves that the absorber had an excellent absorptivity. The simulation and measured resultes are in good agreement ,indicating that the absorbing body can be applied to microstrip antennas to achieve in-band stealth.

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