ALGORITHM IMPLEMENTATION IN CALCULATING DIFFRACTION FROM RADIO-ABSORBING
A. V. Nikitenko
1,2, A. S.
Zubov 2, E. V. Bylichev 2
Lomonosov Moscow State
University, faculty of physics, Moscow
Institute of Theoretical and Applied Electrodynamics of RAS
The paper is received on December 8, 2014
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.