Electromagnetic Scattering Analysis Of Coating Targets Based On High-order Impedance Boundary Conditions

Electromagnetic scattering analysis of coated objects is of great importance in practical applications,especially in radar stealth and anti-stealth,radar recognition and anti-recognition,precision guidance and simulation technology.Therefore,how to analyze the electromagnetic properties of the coated objects accurately and efficiently has long been the focus of computational electromagnetics.An efficient method to solve the electromagnetic scattering problem of three-dimensional conductor coated with arbitrarily shaped dielectrics is presented in this dissertation.The surface electric field integral equation established by the impedance boundary conditions,which uses the relationship between the equivalent current and the magnetic current on the surface coated with the dielectrics,provides a simple and effective method for analyzing the scattering properties of the coated objects.In this dissertation,the scattering problems with coated objects and high-order impedance boundary conditions of dielectric-coated structures have been investigated,and we have done following works:In this dissertation,the scattering problems and high-order impedance boundary conditions of coated objects have been investigated,and we have done following works:Firstly,the main integral equation methods of electromagnetic scattering analysis for coated objects are introduced,and the advantages and limitations of these methods are analyzed.Secondly,the theory of high-order impedance boundary condition is introduced and the expression of high-order impedance boundary condition is deduced.The numerical implementation of the combination of moment method and high-order impedance boundary condition is discussed in detail.And the high-order partial differential terms in the high-order impedance boundary condition is simplified in the realization process.We then give numerical examples to verify the correctness and practicability of this method.Finally,the electromagnetic scattering characteristics of the coated objects are analyzed by using the high-order impedance boundary condition combined with the time domain integral equation method.The specific processes of MOT algorithm used to solve the time-domain integral equation based on the high-order impedance boundary condition have been deduced,including the vector matching method combined with the recursive convolution processing time domain high-order impedance boundary condition to obtain the recurrence relation of surface tangential electric field and electric current.The numerical examples verify the correctness and stability of this method.