Efficient Nyström solutions for electromagnetic scattering by thin conducting structures

In the integral equation method for solving electromagnetic problems with thin conducting structures, there are several unfavorable factors. The individual electric field integral equation (EFIE) and magnetic field integral equation (MFIE) may deteriorate the conditioning of matrix equations due to their degeneration when the thickness reduces. Also, there are more near-interaction evaluations in filling the impedance matrix because the near-interactions between observation points and source patches are popular. In addition, many triangular meshes could have a high aspect ratio due to the small thickness and this will present a difficulty for the accurate evaluation of self- and near-interaction elements. Aiming at these factors, we develop an efficient Nyström method to solve the EM problems based on the combined field integral equation (CFIE) and a numerical example is presented to demonstrate its robustness.