Comparative study of the integral equation formulations when analyzing left-handed materials

A wide analysis of metamaterial spheres with different constitutive parameters has been carried out employing MoM-based SIE formulations. The study has been focused on the accuracy assessment of formulations combining normal equations (CNF), tangential equations (CTF and PMCHWT) and both of them (JMCFIE) when dealing with double negative materials. Relevant and informative features as the condition number, the eigenvalues distribution and the iterative response have been analyzed. The obtained results show up the suitability of the JMCFIE for this kind of analysis in contrast with the unreliable behavior of the other approaches.