Vector Finite Element Method In The Electromagnetic Field Open Domain Problem

In recent years, the finite element method continuously develop to one of the main methods of computational electromagnetism, as it has a very strong ability to describe complicated structure and inhomogeneous media the problem. The applications of the finite element method become more and more, the thornier open regional issues also made a lot of progress. Scientists use several virtual borders to truncate unlimited space and to dealing with actual problems, have achieved satisfactory results; this paper will discuss several ways of achieving this issue.Firstly, this paper discussed a common programming writing skill of the vector finite element method. On basis of using the third party software automatically to produce grid, this paper discuss how to compiles the interconnected routine from the grid point information to edges information, how to integrate coefficient matrix, how to impose the boundary condition in detail. Then it analyze the solutions of opened regional problems of electromagnetic field, including absorbing boundary conditions, perfect matched layer method, finite element boundary integral method . In absorbing boundary conditions, discuss relationship between the angle of incidence and reflection coefficients, the relationship between parameters selected and the computational efficiency and accuracy of calculation. Compute and simulate scattering field of thin plate conductivity. In a perfect matched layer method, discuss the relationship between structure and the reflection, and the relationship between parameter and accuracy of calculation. According to this theory, simulate and calculate the S-parameters of the three-dimensional discontinuous waveguide with the medium-loaded and conductor-loaded column. 2004, the United States Department of Defense decided to deploy a still in the testing stage of new non-lethal weapons to Iraq, so that they can protect the joint army from attacking by local force. This new weapon mainly used for crowd control, its advantages is: the attack on the quiet, "Since the successful development of the atomic bomb has been the most revolutionary new weapons." The United States Air Force in March 2001 released such weapons. The distinguishing characteristic of the weapons systems is using flat-panel parabolic antenna technology; the flat-panel parabolic antenna array is consisted of orthogonal dipole. Then this paper discussed a unit of the antenna .by using finite element method, discuss the magnitude and phase of electric field on the slot and it was verified.