摘要
以磁导系数μ为例推导了处理双负介质本构关系的移位算子法。将μ表示以jω为自变量的Padé近似,用/t代替jω,过渡到时域,再引入离散时域移位算子代替时间微分算子来处理Padé近似形式的μ,进而推导出FDTD计算中时频电磁场中磁感应强度B和磁场强度H之间的关系。最后用基于移位算子的FDTD方法仿真了电磁波与各种双负介质板的相互作用:负折射、相位补偿、平凹双负透镜成像。
The shift operator method for constitutive relation of double negative （DNG） metamaterials is derived. The permeability of DNG media may be described by Pade approximation injw, jw is then replaced by a/at. By introducing z, defined as a shift operator, the relation between B and H of time-harmonic electromagnetic fields is derived in time domain. Finally, the interaction between Gaussian beam and DNG media ban is simulated, such as negative refractive index, phase compensation, piano-concave lens imaging.
出处
《微波学报》
CSCD
北大核心
2008年第1期10-14,共5页
Journal of Microwaves
基金
电波环境特性及模化技术国家重点实验室基金项目资助,项目编号:51486030305HT0101
负折射指数材料电磁特性研究,项目编号:9140C08060507ZCZJ18
关键词
双负介质
FDTD方法
移位算子
负折射
相位补偿
Double-negative metamaterials, Finite-difference time-domain method, Shift operator, Negative refractive index, Phase compensation
