Comparison of Two Approaches to Evaluate Nonsymmetrical Components of Green's Functions for Multi-Layered Media in the Near-Field Region

Abstract

The numerical implementation of Green's functions is a fundamental step for analyzing multi-layered media applications. The computation time and the accuracy of results, which should be maintained for all field regions, are two crucial issues. The discrete complex image method is one of the methods that proved its efficiency in accelerating the computation time and yielding accurate results in the near- and intermediate-field regions. In order to retain this accuracy for the far-field region, the surface-wave contribution should be extracted. However, this procedure results in erroneous results in the near field. This article is concerned with the nonsymmetrical components of the magnetic vector potential. Two different approaches to handle this problem are analyzed. In both approaches, additional artificial poles are extracted in order to eliminate the problem of contaminated results in the near field. The results of both approaches are presented, and the effect of these artificial poles is explored. The results are compared with the numerical integration technique.