An efficient method for analysis of electromagnetic scattering from a 3-D coated object half-buried in PEC rough surface

ABSTRACTTo accurately simulate the electromagnetic scattering from a three-dimensional (3-D) coated object half-buried in perfectly electrically conductor (PEC) rough surface, an efficient method combining the 3-D vector finite element method-boundary integral method (FEM-BIM) with fast multipole method (FMM) is proposed in this paper. FEM is used to model the coated object and the multiple interactions between the half-buried object and rough surface are handled by FMM-enhanced BIM. According to the characteristics of the FEM-BIM matrix equations, a hybrid solver is adopted to solve the matrix equations. In addition, OpenMP parallel acceleration technique is used in the numerical code to accelerate the intensive computations of the prediction process. The accuracy and efficiency of our numerical code are validated by multilevel fast multipole method (MLFMM) in FEKO for both TE and TM polarizations.KEYWORDS: Coated objectcomposite electromagnetic scatteringhalf-buriedrough surface Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis work was supported in part by the National Natural Science Foundation of China under Grant 62201512, in part by the Henan Provincial Science and Technology Research Project under Grant 222102210083 and in part by the Higher Education Teaching Reform Research and Practice Project of Henan Province under Grant 2021SJGLX187.