利用有限元方法分析了TE波辐射下,超材料椭圆柱斗篷的电磁特性。研究发现:当超材料的介电常数、磁导率和电导率偏离理论值0.5%时,斗篷外的电场发生了明显变化;当材料的介电常数、磁导率和电导率为理论值时,不论在斗篷内放置什么特性的材料,也不论斗篷内壁上的边界条件如何,超材料椭圆柱斗篷都具有隐形作用。

Properties for metamaterial electromagnetic cloak with elliptical volume under TE wave irradiation are analyzed using finite element method (FEM). Computation results show that 0.5% deviation of the permittivity,permeability and conductivity from the parameters of the perfect cloak affects the electric-field distributions in the outer region of the cloak. The perfect cloak can exclude the electromagnetic fields from the interior region without perturbing exterior fields and therefore the different objects in it can be effectively hidden from to the outer regions.