Multi-mode analysis of scattering by bodies of revolutions via the combined-field integral equation

The numerical simulation of electromagnetic scattering by PEC bodies of revolution (BORs) involves computing the modal Green functions (MGFs) arising in the electric field integral equation (EFIE) and magnetic field integral equation (EFIE) for a large number of modes. We achieve this by employing five-term recurrence relations that enable the accurate and efficient computation of the MGFs for a large sequence of modes. The computation time of the five-term recurrence relations is decreased by proper truncation of the associated infinite-dimensional matrix representations. The EFIE and MFIE are then employed together in the combined-field integral equation (CFIE), which overcomes the interior resonance problem that occurs in the electromagnetic scattering by PEC BORs with closed geometries. The performance of the proposed technique is validated by analyzing the scattering of modest to large-size PEC bodies of revolution.