Modeling And Calculation Of Conical FSS Radome With High Order Method Of Moments

Frequency Selective Surface(FSS)is widely used in industrial,military and other fields because of its selective filtering characteristics.In order to meet the application scenario,FSS is often designed as a curved surface structure,and it is difficult to simulate accurately because of its complex modeling and large numerical calculation.Method of moments is one numerical method with the highest accuracy in computational electromagnetics.In addition,the utilization of higher order basis function can greatly reduce the amount of unknowns.Higher-order method of moments needs to construct calculation model with bilinear surface,and minimize the number of grids in the premise of ensuring the accuracy of the model.At present,the adaptive grid of the triangular patches has a mature method,but it is still difficult to establish the grid structure for the quadrilateral large patch meshes.In order to solve this problem,this thesis presents a method for modeling bilinear surfaces of cones and cylinders,monolayer and multilayer FSS radomes,which are suitable for a variety of unit structures.This thesis is divided into three parts.First part: firstly reviews the background and analytical methods of FSS,then introduces the development and research status of method of moments,next derives the rotation matrix.By introducing the three parts above,this paper lays a solid theoretical foundation for the follow-up modeling algorithm.Second part: firstly,elaborating modeling ideas and implementation processes.The whole modeling process is divided into fan parameter acquisition,planar element array construction,fan stratification and boundary processing.Secondly,the modeling program is used to model bilinear conical and cylindrical surfaces,monolayer and multilayer FSS radomes with three different FSS units,and successfully pre-processes by using high-order method of moments.Third part: using the method introduction in this thesis to calculate monostatic RCS for conical and cylindrical FSS metal patch,conical and cylindrical FSS with dielectric substrate.And the calculations results contrast with commercial software with a good agreement,which verifies the correctness and feasibility of the method.And the antenna array radiation characteristics analysis of FSS radome monostatic RCS and FSS radome with three hundred thousand unknowns is competed,providing us with a fast modeling and analysis method for the analysis of finite large surface FSS by using high-order method of moments.