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中文摘要：
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.
英文摘要：
By adjusting the effective permittivity of the unit cell,a new method of constructing metamaterial band-pass frequency selective surface was proposed.The effective permittivity of continuous conducting wires is negative below the plasma frequency and thus a stop-band occurs.By combining the continuous conducting wires with cut wires,we realized a one-dimensional frequency selective surface.Both the theory analysis and simulation results demonstrated the facility and feasibility of the method.We also designed a wide-angle and polarization-independent frequency selective surface based on this method.Two samples were fabricated to validate the proposed method;the experiment results were fairly consistent with the simulation results.The proposed method eliminates the complicated calculation and excessive parameter optimization process.It paves a new way of designing frequency selective surfaces and is of important reference values for fabricating THz frequency selective surface as well as multi-band,tunable and miniaturized frequency selective surfaces.
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