Hybrid FDTD method based on conformal technique for modeling wedges composed of conductive and dielectric materials

A hybrid FDTD method based on conformal FDTD is proposed. Both PEC and dielectric conformal schemes are applied for the same calculation area, with one low-cost coefficient modifying technique introduced for suppressing numerical dispersion error with very high accuracy achieved. Such hybrid FDTD method is applied for dealing with electromagnetic scattering problems of wedges composed of PEC and dielectric material. Our numerical results are compared with that of hybrid moment method/physical optics (MM/PO) technique, with excellent agreement obtained. Further, some composite wedges with different geometries, different incident EMP directions are considered for both TE and TM cases, respectively. It is believed that our work is very useful for solving some typical electromagnetic scattering problems.