| It has very important value for the design of antenna engineering, electromagnetic compatibility (EMC) to predict the characteristic of antenna on the complex platform accurately. This thesis founds the high order moment method (HO-MOM) dealing with wire-to-surface junctions, which is applied to analyze EMC of a multi-antenna system on a carrier.Firstly, the integral equation method for solving electromagnetic problems is expounded and the theory of MOM is reviewed. Based on MOM, the computational method for radar cross section or antenna pattern, etc is introduced. Besides, different types of excitation for the scattering or radiation problems are treated in order to be implemented in numerical methods. And the performances of Magnetic-Current Frill and the Delta source are compared.Secondly, the HO-MOM dealing with wire-to-surface junctions is founded and corresponding optimized method is studied. The optimization on Electromagnetic Modeling and Geometric Modeling effectively reduces the number of unknowns. The condition number of impedance matrix is improved, the iterations steps are reduced effectively and the efficiency of computation is increased by the modified IEFIE, which is used to overcome the difficulty of for solving the impedance matrix obtained by traditional EFIE.Thirdly, the fast algorithm for wideband electromagnetic computation is studied. The AWE and WCAWE based on model reduction, Chebyshev based on interpolation are reviewed in detail, which are applied to compute input admittance and RCS. The adaptability of these methods on the problems of computing far-field and near-field is also compared with each other.Finally, EMC of antennas on a carrier is studied. The isolation among antennas and the effect of the antennas on the RCS of the carrier are computed. The effect of relative position of the antennas and the frequency band on the isolation, and the effect of incident wave and the number of antennas on the RCS of the carrier are also researched. |
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