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利用分形结构的自相似性将分形理论应用于频率选择表面(FSS)领域即可使在单屏FSS上具有多频段带通滤波的特性,结合Floquet周期边界条件,采用矩量法研究了二阶Y环分形FSS在不同入射角度下迭代比例因子F及单元排布方式对频率响应特性的影响规律,给出谐振频率的经验估算值.计算及实验结果表明,FSS的谐振频率主要由迭代比例因子及起始单元尺寸决定,而透过率及-3dB带宽则对排布方式的改变较敏感.实验结果与理论分析一致。
Based on the self-similarity of fractal structure, fractal theory can be applied to frequency selective surface (FSS) to make multi-band band-pass filtering on single-screen FSS. Combining the Floquet periodic boundary conditions, the second order Y-ring fractal FSS under different angles of incidence iteration scale factor F and the arrangement of units on the frequency response characteristics of the law, given the empirical estimate of the resonant frequency.Computing and experimental results show that the FSS resonant frequency mainly by the iteration scale factor And the size of the initial cell, while the transmittance and -3dB bandwidth are more sensitive to changes in the arrangement.Experimental results are consistent with the theoretical analysis.