Reverse Optimum Design And Research Of Artificial Electromagnetic Materials For Transforming Optical Media

With the rapid development of electromagnetic science,more and more new technologies have been proposed and tried.Among them,the transform optics theory based on Maxwell’s equations provides a new effective way for the study of electromagnetism.Using the theory of transformation optics to analyze and design the medium parameters of a given area,the propagation direction of the electromagnetic wave in this area can be regulated according to our needs.Artificial electromagnetic materials through the material unit on some artificial special structure and design,compared to the nature of the original material of the basic physical properties,can get a lot of strange characteristics.The rapid development of artificial electromagnetic materials has provided the possibility for transforming optics applied in real life from the perfect concept of theoretical level.In this paper,the theory of transformation optics is taken as the starting point to reversely optimize the design and research of artificial electromagnetic materials.The methods of transforming electromagnetic parameters calculated by optical optics and looking for the corresponding artificial electromagnetic materials in the reverse direction are summarized.New support is provided in the field.The main contents of this paper are as follows:1.The characteristic mode theory is applied to the optimization research.The surface current distribution of different structures is observed by using FEKO simulation software,and the surface current is decomposed into the corresponding characteristic current.The characteristic current distribution of artificial electromagnetic material elements in different modes is analyzed.From the physical point of view,the intrinsic relationship between the radiation characteristics of the structure and the equivalent material parameters is revealed according to the different current distributions in different modes.It provides a new idea for searching and optimizing artificial electromagnetic materials.2.Based on the theory of inverse transformation optics,with the beam-switching surface as the design goal,the artificial electromagnetic surface is optimized based on the calculated electromagnetic parameter values.Specifically including:using the above analysis method as a guide,a large number of numerical simulations of classical artificial electromagnetic structures to determine the selection of the basic unit;establishing a MATLAB and CST co-simulation platform to use the basic model selected theoretically as the initial structure,using the genetic algorithm The overall structure is further optimized,and finally the design of an artificial electromagnetic surface that satisfies the desired beam is achieved.According to the analysis of the above content,based on the theory of transformation optics,by optimizing the structure parameters of unit artificial electromagnetic materials,meet transform calculated optical permittivity and permeability values of the structure,in order to construct artificial electromagnetic surface,flexible and effective control of the radiation characteristics of the antenna has brought a new way.