Abstract: This paper presents a hybrid method of moments-physical optics (MoM-PO) method based on the mode decomposition technique for the analysis of the electrically large antenna-body of revolution (BOR) radome system. For the BOR radome, due to its rotation-symmetric property, the mode decomposition technique can be used to reduce the dimension of the problem. For each mode, the equivalent electric and magnetic currents in the flat region of the radome are determined by physical optics (PO), which are then integrated into the method of moments (MoM) equation to eliminate the number of unknowns. This method dramatically reduces the computation complexity and memory demand, and then it can analyze the large scale antenna-BOR radome system efficiently.

Key words: mode decomposition, method of moments, physical optics, radome