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提出了一种构建超材料带通频率选择表面的新方法,该方法通过调节单元结构的等效介电常数实现.金属丝阵列在等离子频率以下等效介电常数为负,产生传输禁带,在金属丝阵列中加入介电常数符合Lorentz模型的短金属线结构,可得到一维带通频率选择表面,理论分析和仿真计算充分验证了这种方法的可行性.基于这种方法,将一维超材料频率选择表面单元拓展设计为二维对称结构,实现了一种宽入射角、极化无关的频率选择表面,最后加工了两个样品对基于等效介质理论的频率选择表面设计方法进行了实验验证.这种设计方法不必考虑常规频率选择表面所涉及的复杂计算和多参数优化等问题,拓展了频率选择表面的设计思路,对于THz频段频率选择表面的设计,及多通带、可调、小型化频率选择表面都具有借鉴意义.
A new method of constructing bandpass frequency selective surface of metamaterials is proposed, which is achieved by adjusting the equivalent dielectric constant of the cell structure.At the same time, the equivalent dielectric constant of the wire array under the plasma frequency is negative, In the wire array, a short metal line structure with Lorentz model is added to the wire array to obtain a one-dimensional bandpass frequency selective surface. The theoretical analysis and simulation calculation fully verify the feasibility of this method. Based on this method, The frequency-selective surface elements of the dimensionally-metamaterials are designed to be two-dimensional symmetrical structures, and a wide angle of incidence and polarization-independent frequency selection surface is realized. Finally, two samples are processed to design the frequency selection surface based on the equivalent medium theory This design method does not have to consider the complicated calculation and multi-parameter optimization involved in the conventional frequency selective surface, and expands the design idea of the frequency selective surface. For the design of the THz frequency-selective surface and the multi-passband, Tune, miniaturization frequency selection surface has reference.