Electromagnetic Scattering Analysis Of Connected Finite Periodic Structures With SSED-MOM/FEM Method

An improved novel hybrid method based on simplified sub-entire domain (SSED) basis functionmethod combined with method of moment (MoM) and finite element method (FEM)(SSED-MoM/FEM) is employed for electromagnetic scattering analysis of connected finite periodicstructures. The main contributions of the dissertation include：First, an improved calculation zoning decomposition technique is proposed, based on which theimproved finite element method is used for electromagnetic scattering analysis of connected finiteperiodic structures. RCSs of slab periodic structures, media slab periodic structures and conductingcube periodic structures are computed and analyzed. The detailed algorithms are given.Secondly, an improved method referred to as the SSED-MoM/FEM is employed to analyzeelectromagnetic scattering of connected finite periodic structures. In this method, the analysisprocedure is split into two steps: firstly, the improved FEM is used for the solution of a small-sizearrays, where equivalent electric and magnetic current on the surface of the element are used as theSSED basis functions; secondly, the total RCS of the whole arrays is computed with MoM based oncombined field integral equation (CFIE). The detailed algorithms of the improved SSED-MoM/FEMare presented in this dissertation and numerical results demonstrate the method is efficient forconnected periodic arrays.The proposed method can be applied to the design of connected finite periodic structures such asphased array antennas, frequency selective surface (FSS) and other connected periodic structures.