Complex Medium And The Electromagnetic Characteristics Of Finite Element Analysis

For anisotropic, bi-isotropic, bi-anisotropic and other complex materials, their constitutive relationships are more complicated than other general isotropic materials. They have many electromagnetic characteristics that other materials generally do not have, which has attracted attention of many scholars. Most of these media are synthetic materials and the analysis of their electromagnetic performance needs complex and difficult technology, high-cost and long cycle experiment. But the application of numerical simulation methods can not only decrease the costs of productions, reduce the experimental period, but also guarantee the reliability of productions. As a result, numerical methods have become more and more important with the development of electrical computers and modern science and technologies.In this paper, complex materials are studied by use of the vector finite element method (FEM). [S] parameters and Radar Scattering Cross-section(RCS) of complex objects are calculated. The numerical results are in agreement with the published data. The complex media including the anisotropic, bi-isotropic, and bi-anisotropic media can be modeled and calculated. The Tearing and Interconnecting Method is also introduced for FEM .In the method, a given spatial computational domain is first "torn" into non-overlapping sub domains and then all the sub domains are "glued" together by enforcing the electric and magnetic field continuity conditions at the sub-domain interfaces using a modified Robin-type transmission condition.