EFIE with a novel perturbed ILUT preconditioner for electromagnetic scattering by conducting objects in half space

In this paper, a highly efficient and robust scheme is proposed to analyzing electromagnetic (EM) scattering of arbitrary shaped perfect electrically conducting (PEC) objects in half space. The electric field integral equation (EFIE) with the half-space Green´s function is chosen as the basis of this method due to its great versatility and accuracy. A perturbed dual threshold incomplete LU factorization (ILUT) preconditioner based on the near-field interactions in the improved EFIE (IEFIE) operator is proposed as an effective preconditioner. It will be further shown that such preconditioner enhances the stability of the traditional ILUT preconditioner based on EFIE, which may occasionally encounter problems of instability for real-life problems. Numerical examples are presented to demonstrate the high efficiency and robustness of this method over other existing alternative solutions.