Local stereoscopic field singularity models for FDTD analysis of guided wave problems

New local FDTD field singularity models have been proposed. In an extension to previous local models, not only radial field variations but also the geometry of field lines and the curvature of Ampere/Faraday integration surfaces are taken into account. The method is shown to provide the same order of accuracy as previously published specialised higher-order algorithms. Yet, contrary to those methods, the gain in accuracy is achieved practically without any increase of the computing time of FDTD simulations.