针对多通带频率选择表面(Frequency Selective Surface, FSS)带宽较窄的问题,基于方环形缝隙及其互补结构设计了一种工作于 X/Ku 波段的双通带频率选择表面.在单层介质两侧加载互补贴片的基础上提出了两层介质加载三层金属贴片结构,得到了一个一阶通带和一个二阶通带,二阶通带两个极点的反射率达到–30 dB以上,实现了宽频特性.仿真结果表明:该频率选择表面具有很好的角度稳定性和极化稳定性,两个通带的相对带宽分别达到了13.87%和28.57%,第二通带带内平坦,中心插损很小,整体带外抑制明显,综合性能较好.%To achieve the broadband characteristic of multi-passband frequency selective surface(FSS), a novel dual-passband FSS worked at X/Ku band based on square ring gap and its complementary structure was proposed. The proposed FSS consisted of two-layer dielectric board loaded with three-layer metal patch instead of complementary metal patch on both sides of the single layer dielectric board. A first-order passband and a second-order passband were obtained. The reflectivity of the two poles of the second-order passband is more than –30 dB, and the broadband characteristic is realized. Simulation results show that the FSS has good stability of angle and polarization states. The bandwidths of two pass-bands are 13.87% and 28.57% respectively. The second passband is quiet flat and smooth, in which the insertion loss is low. The overall stopband suppression and the comprehensive performance is good.
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