CAJ | 학술논문

文章研究了分析双负媒质平板成像规律的一种方法,双负介质的介电系数和磁导系数均为频率的函数,使本构关系在时域成为卷积关系,这就给应用时域有限差分(FDTD)方法计算双负媒质平板中波的散射和传播带来困难;因此将Z变换理论应用到双负媒质中的FDTD计算当中,对麦克斯韦方程做了修改,使得FDTD计算式独立于双负媒质函数,并给出双负媒质中与频率有关的FDTD表达式;数值仿真了电磁波与双负媒质平板的相互作用,详细讨论了双负媒质平板透镜成像理论,并提出了一种球差更小的平板透镜系统.
문장연구료분석쌍부매질평판성상규률적일충방법,쌍부개질적개전계수화자도계수균위빈솔적함수,사본구관계재시역성위권적관계,저취급응용시역유한차분(FDTD)방법계산쌍부매질평판중파적산사화전파대래곤난;인차장Z변환이론응용도쌍부매질중적FDTD계산당중,대맥극사위방정주료수개,사득FDTD계산식독립우쌍부매질함수,병급출쌍부매질중여빈솔유관적FDTD표체식;수치방진료전자파여쌍부매질평판적상호작용,상세토론료쌍부매질평판투경성상이론,병제출료일충구차경소적평판투경계통.
This paper studies a method of analyzing the flat slab lens imaging. The analysis of electromagnetic scattering and propagation in the double-negative(DNG) medium is complicated in the time domain since its permittivity and permeability are frequency-dependent. In order to make the FDTD expression independent of the double-negative medium function, Z-transform is applied to the FDTD method in the double-negative medium. The frequency-dependent expressions of the FDTD in the double-negative medium are given. The interaction between the electromagnetic wave and the DNG medium is simulated, the double negative medium flat lens imaging theory is discussed in detail, and the flat lens system which has smaller spherical aberration is proposed.