Electromagnetic Scattering by Finite Conducting Fiber: Limitation of a Previous Published Code

Abstract

In this paper, the authors examine the low aspect ratio limits of a computational code whose development and application they reported several years ago. A detailed comparison has been made between this code, based on the Moment Method with point matching scheme, and the T-matrix method for the solution of the problem of electromagnetic scattering and absorption by cylinders of finite conductivity. The Alyones et al. code (A-code) has previously been shown to be applicable to relatively thin multilayered fibers, and the T-matrix method has been shown to be valid for low aspect ratios. . . both composed of bulk materials. Here the A-code is tested for low aspect ratio solid fibers and larger radial size parameters (ka) for both low and high conductivity fibrous materials. For very low values of the radial size parameter, the two codes enter agreement at lower aspect ratios, generally at a value of about 10, and as the radial size parameter increases, the agreement occurs at smaller aspect ratios until there is no convergence between the two methods. The criterion is stricter for higher conductivities. A combined code has been formed to handle the calculation of electromagnetic scattering by finite conducting fibers.