Polarization-Current-Based FDTD Near-to-Far-Field Transformation

摘要

A new near-to-far-field transformation algorithm for three-dimensionalfinite-different time-domain is presented in this article. This new approach isbased directly on the polarization current of the scatterer, not the scatterednear fields. It therefore eliminates the numerical errors originating from thespatial offset of the E and H fields, inherent in the standardnear-to-far-field transformation. The proposed method is validated via directcomparisons with the analytical Lorentz-Mie solutions of plane waves scatteredby large dielectric and metallic spheres with strong forward-scattering lobes.