FEM/BEM For Analysis Of Electromagnetic Scattering Of A Mixture Of Conducting And Dielectric Objects

Finite element method (FEM) and boundary element method (BEM) are combined to analyze electromagnetic (EM) scattering of a mixture of conducting and dielectric cavities objects in this thesis. Two-dimensional nodal FEM/BEM is employed for analyze electromagnetic scattering of the cavities coated or filled with radar absorbing materials (RAM). Schemes on implementing the hybrid method to analyze EM scattering properties of complex objects is discussed, and improvement of the accuracy, efficiency and versatility of the hybrid method is also discussed. An optimum scheme for constructing finite element meshes is proposed, which can reduce the sum of the unknowns. Numerical technique is discussed, and application program is developed for analyze EM scattering of coated cavities.This paper analyzed the impact of different RAM on electromagnetic scattering characteristics of the objects, and the effect of RCS caused by different coating RAM thickness and different coating order was discussed, numerical results are in agreement with those presented by other papers or exact solutions. The results indicated that the back RCS can be reduced obviously by using optimal coating RAM,coating thickness and coating order. The results presented in this thesis are valuable for stealth technology,radar detection technology and microwave remote sensing technology.