NONRIGOROUS SYMMETRIC SECOND-ORDER ABC APPLIED TO LARGE-DOMAIN FINITE ELEMENT MODELING OF ELECTROMAGNETIC SCATTERERS

Facta Universitatis, Series: Electronics and Energetics

Slobodan Vojka Savić¹  Milan Miodrag Ilić² 

[1] University of Belgrade, School of Electrical Engineering, Belgrade, Serbia$$;Colorado State University, Department of Electrical and Computer Engineering, Fort Collins, CO, USA$$

关键词: absorbing boundary condition;    electromagnetic scattering;    finite element method;    numerical methods;   

DOI  :  10.2298/FUEE1604675S

来源: University of Nis

【 摘 要 】

Nonrigorous symmetric second-order absorbing boundary condition (ABC) is presented as a feasible local mesh truncation in the higher-order large-domain finite element method (FEM) for electromagnetic analysis of scatterers in the frequency domain. The ABC is implemented on large generalized curvilinear hexahedral finite elements without imposing normal field continuity and without introducing new variables. As the extension of our previous work, the method is comprehensively evaluated by analyzing several benchmark targets, i.e., a metallic sphere, a dielectric cube, and NASA almond. Numerical examples show that radar cross section (RCS) of analyzed scatterers can be accurately predicted when the divergence term is included in computations nonrigorously. Influence of specific terms in the second-order ABC, which absorb transverse electric (TE) and transverse magnetic (TM) spherical modes is also investigated. Examples show significant improvements in accuracy of the nonrigorous second-order ABC over the first-order ABC.

【 授权许可】

Unknown