任意分层手征介质球域中并矢格林函数理论和应用

The Dyadic Green's Theory of Spherical Multilayered Chiral Media and Its Applications

本文首先应用散射迭加法，给出了含源任意分层手征介质球域中的并矢格林函数。以手征介质球壳为例，分析了位于球中心处点偶极天线的辐射特性，以及归一化辐射阻抗随球壳厚度的变化规律，在平板近似条件下，研究了手征导纳对手征介质球壳传输特性的影响，并且讨论了手征介质球壳内、外表面与空气之间阻抗匹配时，点偶极天线远区辐射场的极化特性，结果表明，通过改变球壳的归一化厚度，可以调节辐射场的极化状态。

In this paper,the dyadic Green's functions of an electric current source in spherioal multilayered chiral media are derived first using the method of scattering superposition. The radiated fields and normalized radiation resistance are studied for a point dipole antenna located at the center of a chiral spherical shell. The effect of chirality admittance on the transmittance properties of chiral spherical shell is also investigated using the plane-slab approximation. The results show that the polarizated state of radiated fields can be regulated by changing the normalized thickness of chiral spherical shell.