The FIT-MoM Hybrid Method for Analysis of Electromagnetic Scattering by Dielectric Bodies of Revolution

In this paper, the finite-integration technique (FIT) is hybridized with the method-of-moments (MoM) for the case of electromagnetic scattering by dielectric bodies of revolution (BoRs). A frequency-domain FIT is used to account for the inhomogeneous dielectric region, while the MoM is used to model the outer environment by means of dyadic Green's functions. The assumption about the rotational symmetry of the analyzed object allows for the application of usual decoupling of azimuthal modes, thus reducing the original 3-D problem to a number of 2-D cases. This in turn results in much smaller linear equation sets. Moreover, for nonzero modes, we use the possibility to further reduce the number of unknowns by eliminating azimuthal field components from the final equations.