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为了实现频率选择表面(FSS)的平顶传输特性,选取矩形栅格和传统圆环的组合图形为基本单元,设计了一种新型组合图形单元的FSS。利用谱域法对这种新型FSS的单屏结构进行理论计算和分析。计算结果表明,这种新型的FSS单屏结构能够给出陡峭边缘和平顶的宽频带传输特性,平顶带宽可达8 GHz;同时能够把相邻很近的信号带分离开从而实现双重通信,例如在X波段和Ku波段的信号,并且对不同入射角度的电磁波保持稳定的双带特性。
In order to realize the flat top transmission characteristic of frequency selective surface (FSS), a combination of rectangular grid and traditional ring is taken as the basic unit, and a new type of FSS is proposed. The single-screen structure of this new FSS is calculated and analyzed by using the spectral domain method. The results show that the new FSS single-screen structure can provide broadband transmission with steep edges and flat tops, and the flat-top bandwidth can reach 8 GHz. At the same time, the new FSS single-screen structure can separate adjacent signal bands to realize dual communication, For example, signals in the X-band and the Ku-band, and maintain stable double-band characteristics for electromagnetic waves of different incident angles.