| An integral equation approach is used to solve for the Electromagnetic Scattering fields from penetrable cylinders of infinite length. A Plane Wave Expansion Galerkin (PWEG) moment method approach is used to solve the partinent integral equations. This approach provides an efficient computational model for scattering field calculations. The formulation given is in general applicable to cylindrical scatterers of arbitrary cross-section, but specific examples are given for cylindrical scatterers of rectangular cross-section shapes, where some integrals are evaluated into a closed form. This further increases the numerical efficiency. Two different polarizations of the incident fields are considered, a transvers magnetic field generated by a uniform time harmonic electric line source and a transvers electric field generated by a uniform time harmonic magnetic line source. Additionally, the scatterer may be immersed in a homogeneous ambient medium or in a lossy half space, i.e., buried in earth. The latter is modeled by using the Sommerfeld integrals.; Some discussions are given for the radiation patterns of an electric or a magnetic line source placed on the air-earth interface. A possible approximate model for these patterns are examined. Also, an approximate model for the buried scatterers are discussed. Finally, the computational efficiency of the Plane Wave Expansion Galerkin (PWEG) is discussed, and is compared with the Pulse Basis Point Matching (PBPM). |
