A universal and numerically efficient method of moments formulation covering a wide frequency band

In this paper, a novel MoM-based procedure is developed for efficient treatment of scattering problems over a wide frequency band, including very low frequencies where many of the conventional algorithms often fail. The proposed approach, based on closed-form expressions for the evaluation of the fields radiated by rooftop basis functions, is demonstrated to be universally applicable to conducting and dielectric objects without having to address the singularity issues associated with the conventional MoM approach. Furthermore, an equivalent rooftop type of basis function is introduced for handling curved surfaces. Illustrative examples demostrating the reliability and the efficiency of the described procedures are included.