Cavity And Finite Element Method For Electromagnetic Scattering And Coupling Of The Cavity And Target

The high efficient algorithm base on finite-element for the character of body with open cavities' scattering and coupling has been studied in this dissertation. The dissertation has been divided into three part : the method of scalar FEM for calculating the scattering and coupling character of 2D cavities ; the high efficient algorithm of vector FEM for the scattering and coupling character of 3D cavities; the method of calculate caliber admittance matrix for high efficient algorithm to compute the scattering and coupling character body with open cavities.At the beginning of the dissertation, the background, the meaning and the main contribution of the research work have been introduced. Subsequently, methods for electromagnetic scattering problems of cavities have been introduced roundly.At first we have studied the algorithm for 2D problem. To deal with the 3D cavities we exploit the method of vector FEM, high efficient algorithm for large sparse matrix and the method to compute singular integration to calculate the scattering and coupling character of many cavities of different shape or with medium loading.Based on all the research works mentioned above, a new technique to compute the caliber admittance matrix has been derived and applied for the problem of the scattering by electrically body with opening cavities. This method need fewer computation time than Connecting Scheme (CS) based on boundary integral equation and can be apply more easily and more widely. All the numerical results listed in this dissertation have demonstrated the validity and high efficiency of our research works.