线电流源激励下正多边形双负介质柱的聚焦特性
Focus character for double-negative dielectric volume with regular polygon structure under electric line source
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摘要: 利用时域有限差分法分别分析了线电流源激励下，正三角形、正四边形和正六边形双负介质柱的近场分布。发现对于介电常数和磁导率都很小且无耗的双负介质柱，当激励位于正多边形顶角角平分线的外延长线上时，在双负介质柱内部不会出现 焦点。将该电磁模型同Arslanagic等人介绍的方法进行了比较，证明了电磁模型的有效性。Abstract: Focus character for double-negative dielectric volume with regular triangular,square and hexagonal structure under electric line source is analyzed using finite difference time domain method. The computation results show that “focus”does not exist in the double-negative dielectric volume, when the excitation is located on the outside extension line of angular bisector of corner angle in double-negative volume with very small permitivity and permeability. The results are compared with Arslanagic’s analytic results and their validity is proved.
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