Critical frequencies for solving electromagnetic scattering problems by the moment/finite-element method

Abstract

Electromagnetic scattering numerical methods, resonances, moment / finite-element method ABSTRACTIn the last few years, the hybrid moment-merhod/finite-element-method (MM/FEM) approach has been wide& used to solve electromagnetic scatteringproblems. However, as is well known, this method faik at the resonance frequencies of a cauiv that is obtained by covering the surface of a scatterer with a pegect electric conductor and filling it the aiemal medium, and at the resonance frequencies of a cavity that is obtained by covering the surface of a scatterer with a perfect magnetic conductor, and @ling it with the scatterer itself. Numerical simulations showing how these different resonances affect MM/FEM solutions are presented and discussed. 0 1996 John Whky & Sons, Inc.

Electromagnetic scattering by weakly lossy multilayer elliptic cylinders

“…The calculated results are in very good agreement with those in [5]. Finally, we compare field quantities with those calculated by using a MM/FEM code [6]. A three-layer elliptic cylinder is considered (a1 = 0:100, a2 = 0:130, a3 = 0:160, d = 0:080, " 0 1 = 1:0, " 0 2 = 4:0, " 0 3 = 2:5, and " 00 1 = " 00 2 = " 00 3 = " 00 ).…”

Cavities Involving Metamaterials With an Uncountable Set of Resonant Frequencies

“…Moreover, it is important to note that also the simulators of scattering problems based on the hybrid moment method-finite element method [14] can fail at an uncountable set of frequencies when the interior region is filled with DPS and DNG media [15], [16].…”