"JOURNAL OF RADIO ELECTRONICS"  N 12, 2014

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3D-RCWA ALGORITHM IMPLEMENTATION IN CALCULATING DIFFRACTION FROM RADIO-ABSORBING MATERIAL

 

A. V. Nikitenko 1,2, A. S. Zubov 2, E. V. Bylichev 2

1 Lomonosov Moscow State University, faculty of physics, Moscow

2 Institute of Theoretical and Applied Electrodynamics of RAS

 

The paper is received on December 8, 2014

 

Abstract. The three-dimensional RCWA method applied to the scattering problem for a two-dimensional radio-absorbing material is presented. The goal of this study is to check applicability of the method for calculation of reflection indices of materials used in modern unechoic chambers and compact ranges. The RCWA method is considered with some enhancements, in particular: method of an eigenvalue problem forming is presented, method of solving final system of linear equations is chosen. Calculations are conducted using characteristics of a commercial pyramidal radio-absorbing material. Verification of the results conducted by RCWA is presented by comparison with results obtained by two different methods –the finite element method and moment method. Good agreement in both cases is shown. Also, it is shown that 3D RCWA algorithm’s performance is at least not worse than others; furthermore 3D RCWA algorithm appears to be better at calculating diffraction on layered materials with non-homogeneous permittivity.

Key words: 3D RCWA, radio-absorbing material, unechoic chamber, compact range.