Based On The Two-dimensional Metamaterial Fdtd Simulation And Design Of Electromagnetic Devices

Metamaterials have attracted considerable attentions since from its assumption was firstly proposed by Pendry to its successful achievement of its minor structure. It was evaluated by Science as one of the year's top ten scientific and technology developments. Since then, researchers have simulated the characteristics of metamaterials using various methods to further investigate the electromagnetic characteristics. Yee proposed a reasonable mesh system since 1996, and the successful foundation of time domain finite difference (FDTD), FDTD has become one of the important methods to investigate the electromagnetic phenomenon.Based on the fundamental principle of electromagnetic field and Maxwell' equations, this thesis first derived the iterative formulas of FDTD finite element method for regular materials and metamaterials, and then derived the electromagnetic characteristic equations of electromagnetic cloak and electromagnetic concentrator and the iterative formulas of FDTD. Finally, the metamaterials properties and its electromagnetic instrument were simulated by C programming language based on FDTD, and the advantages and disadvantages of this method were discussed.The main contents include three parts as follows.In the first part, the method of FDTD was first introduced briefly, and its divergence, stability and the boundary problem of medium were mainly discussed.In the second part, the applications and characters of matamaterials was introduced, the FDTD method in metamaterials as medium was investigated, and the instability of dispersion medium in numerical calculation, and the boundary problem between metamaterials and medium were discussed in detail.In the third part, the physical characteristics of metamaterials was simulated in FDTD and discussed, the iterative formulas of the electromagnetic cloak and electromagnetic concentrator were derived, and the electromagnetic cloak and electromagnetic concentrator were simulated in FDTD. The effectiveness of the equations is confirmed by the simulation results, and the mechanisms of electromagnetic cloak and electromagnetic concentrator were more intuitive understanding.