运用有限差分时域法计算具有径向色散特性的圆柱形隐形斗篷

提出了一种具有径向色散特性有限差分时域法（FDTD法）的电磁隐形斗篷建模.隐形斗篷的介电常数和磁导率是采用了drude色散模型以及相应的色散FDTD算法.数值模拟表明,在理想的条件下,隐形斗篷中的物体对外电磁场是隐形的.对于入射平面波和点声源,波前平滑地进入隐形斗篷,并绕过中心的物体区域,离开隐形斗篷后又恢复为原来的传播状态.远场散射图表明,与一个理想导体圆柱相比隐形斗篷可以减少沿各个方向的散射.

The Finite-difference Time-domain Method for the Radial Dependent Dispersive Cylindrical Cloaks

This paper proposes a radial dependent dispersive finite-difference time-domain method (FDTD) for the modeling of electromagnetic cloaks. The permittivity and permeability of the cloak are mapped to the Drude dispersion model and taken into account in dispersive FDTD simulations. Numerical simulations demonstrate that under ideal conditions, objects placed inside the cloak are ‘invisible′ to external electromagnetic fields. For an incident plane wave and the point source, the wave front enters the cloak smoothly, bends around the central region and returns to its original pattern after leaving the cloak. The far scattering pattern shows that the scattering of the cloak can be reduced compare to the scattering of a perfectly conducting cylinder.