Physical-density integral equation methods for scattering from multi-dielectric cylinders
For researchers in computational electromagnetics, this method offers a flexible and accurate approach to multi-dielectric scattering problems, though it is an incremental improvement over existing integral equation methods.
The paper presents an integral equation method for scattering from multi-dielectric cylinders using physical-density representations, achieving high accuracy. Unique solvability is proven for homogeneous cylinders, and numerical examples demonstrate the method's effectiveness.
An integral equation-based numerical method for scattering from multi-dielectric cylinders is presented. Electromagnetic fields are represented via layer potentials in terms of surface densities with physical interpretations. The existence of null-field representations then adds superior flexibility to the modeling. Local representations are used for fast field evaluation at points away from their sources. Partially global representations, constructed as to reduce the strength of kernel singularities, are used for near-evaluations. A mix of local- and partially global representations is also used to derive the system of integral equations from which the physical densities are solved. Unique solvability is proven for the special case of scattering from a homogeneous cylinder under rather general conditions. High achievable accuracy is demonstrated for several examples found in the literature.