Complex Target Electromagnetic Scattering Characteristics Of Finite Element Analysis Of Boundary Integral Method

Computational electromagnetics has been gradually tend to mature after decades of development. Especially in numerical problems to solve the three-dimensional complex targets, domestic and foreign scholars have proposed a variety of methods, traditionally, such as the method of moments, finite element method, and the subsequent finite element boundary integral method, decent integration methods. In order to quickly and efficiently solve numerical analysis problems, the scholars also raised many accelerated classes, such as mature multilevel fast multipole method, low rank matrix compression class methods. And recently, the scholars raised multilevel ray-propagation fast multipole algorithm and far-filed approximation methods. With the development of computer, many of the problems, which could not be solved before, can be solved now. But even so, the numerical calculation of three-dimensional large target is also difficult to accomplish on a single computer. For this reason, the scholars applied parallel technology to numerical calculation.Firstly, in this thesis, parallel technology is used in the finite element boundary integral method to solve the problems of numerical analysis which are the complex three-dimensional large targets. Moreover, we use a new Higher Order Hierarchical basis function which is based on triangular elements and tetrahedron elements in finite element boundary integral method. Through the numerical analysis, order finite element boundary integral is more outstanding advantages than the low-order finite element boundary integral.Second, we use the finite element boundary integral method to analyze electromagnetic scattering characteristics of the complex medium, we not only analyze the electromagnetic scattering properties of the anisotropic medium, and also analyze the electromagnetic scattering properties of double-isotropic complex medium, through contrast and literature can see that the correctness of the finite element boundary integral method in the analysis of complex medium.Finally, we use the finite element boundary integral method to solve practical engineering applications. We first analyze the near space HYPERSONIC aircraft electromagnetic scattering characteristics. Aircraft which is flying at high speed will produce a thin layer of plasma on its own surface. we analyze the scattering characteristics.