Design And Research Of Electromagnetic Invisibility Cloaks Based On Optical Transformation

With the continuous development of artificial electromagnetic metamaterials,many researchers are working on the design and implementation of new functional devices such as electromagnetic invisibility cloaks.The principle of optical transformation provides an effective theoretical basis for this purpose,and thus the design of electromagnetic invisibility devices based on the theory of optical transformation is developed,which is equivalent to virtual space by means of space mapping,so as to change the propagation path of electromagnetic waves,achieve the purpose of artificial control of electromagnetic waves,and then achieve the purpose of electromagnetic stealth.In view of the defect that the traditional electromagnetic invisibility cloak cannot realize internal and external communication when it wraps the target object in it,people have proposed various cloak designs that can realize invisibility and carry out internal and external information interaction at the same time.This cloak is called electromagnetic invisibility anti-cloak.But the cloak of material of electromagnetic parameters with high complexity,such as its heterogeneity and anisotropy of parameters has been affect cape design and implementation of the key factors,in order to achieve the cloak design diversification and its simplification of electromagnetic parameters,this paper puts forward a new design on the basis of the principle of optical transformation,the main research work and innovation points are listed below:First: Electromagnetic invisibility anti-cloak based on nonlinear coordinate transformation is designed.For circular electromagnetic invisibility cloak and ellipse electromagnetic invisibility cloak,by introducing a nonlinear coordinate transformation of ways to get new more simplified electromagnetic parameters,to achieve the electromagnetic stealth and function of information interaction,and through software simulation results show that the method has certain feasibility and reach the ideal stealth effect.Second: A new minimized multifunctional invisibility cloak is designed.On the basis of the traditional electromagnetic invisibility cloak,by laying new material layer,the applicability of the cloak,implement multiple functions of the integration of the functional device,and intercepting the cloak of parts of the fan to add the two triangle as a closed area design,makes the cloak is an enclosed type multifunctional invisibility cloak.Compared with other cloaks,this kind of cloak has better applicability,that is,it can realize multiple functions in one.It also has a smaller physical size,greatly simplifying the electromagnetic parameters of the cloak,and reducing the difficulty of implementing the cloak without affecting its invisibility and other functions.