CAJ | 학술논문

文章研究了分析双负媒质电磁散射规律的一种方法,双负媒质是介电系数和磁导系数均为负值的介质材料.引入色散Drude模型后,本构关系在时域成为卷积关系,因此将Z变换理论应用到双负媒质中的时域有限差分(FDTD)中,使FDTD可计算双负媒质中电磁波的散射和传播.该文对麦克斯韦方程做了修改,并给出双负媒质中介电系数和磁导系数均为频率函数的FDTD表达式.最后,数值仿真了电磁波与双负媒质平板的相互作用;计算了覆盖了双负媒质金属柱的电磁散射,探讨了双负媒质在隐身技术方面的应用前景.
문장연구료분석쌍부매질전자산사규률적일충방법,쌍부매질시개전계수화자도계수균위부치적개질재료.인입색산Drude모형후,본구관계재시역성위권적관계,인차장Z변환이론응용도쌍부매질중적시역유한차분(FDTD)중,사FDTD가계산쌍부매질중전자파적산사화전파.해문대맥극사위방정주료수개,병급출쌍부매질중개전계수화자도계수균위빈솔함수적FDTD표체식.최후,수치방진료전자파여쌍부매질평판적상호작용;계산료복개료쌍부매질금속주적전자산사,탐토료쌍부매질재은신기술방면적응용전경.
This paper studies a method for analyzing electromagnetic scattering from double-negative meta-materials.The double-negative(DNG)mediums are characterized by simultaneously negative permittivity and permeability.The Drude model is introduced,and the Z-transform is applied to the FDTD method in the DNG medium so that the FDTD method can be adopted in analyzing the electromagnetic scattering and propagation in the DNG medium.Some improvements are made on the Max well's equations and the frequency-dependent expressions of FDTD in the DNG medium are given.The interaction between the electromagnetic wave and the DNG medium is simulated numerically,the electromagnetic scattering of the conducting square cylinder coated with DNG mediums is calculated,and the potential application of the DNG medium in the future is also discussed.