用相互作用加载丝的单、双网格模拟薄层的介观有效材料参数
Mesoscopic effective material parameters for thin layers modeled as single and double grids of interacting loaded wires
摘要：
作为薄复合层的一个例子，我们考虑单和双网格的周期性排列的相互作用的导线加载一定的分布电抗性阻抗。严格计算了垂直入射平面波在导线上产生的电流，并确定了相应的偶极矩密度。使用这些数据和平均场，我们指定介观材料参数为拟议的网格结构。这些参数取决于网格的数量，并测量平均诱导极化。结果表明，适当加载的双网格具有极化响应，在一定的频率范围内可以描述分配负值的介观参数。讨论了组合薄板材料参数取值的物理意义。所提出的方法的双网格结构的预测结果进行了比较，使用常用的S参数检索程序得到的结果。
英文摘要：
As an example of thin composite layers we consider single and double grids of periodically arranged interacting wires loaded with a certain distributed reactive impedance. Currents induced to the wires by a normally incident plane wave are rigorously calculated and the corresponding dipole moment densities are determined. Using this data and the averaged fields we assign mesoscopic material parameters for the proposed grid structures. These parameters depend on the number of grids, and measure the averaged induced polarizations. It is demonstrated that properly loaded double grids possess polarization response that over some frequency range can be described by assigning negative values for the mesoscopic parameters. Discussion is conducted on the physical meaningfulness to assign such material parameters for thin composite slabs. The results predicted by the proposed method for the double-grid structures are compared with the results obtained using the commonly adopted S-parameter retrieval procedure.
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