Paraxial space-domain formulation for surface fields on large dielectric coated circular cylinders

There are few asymptotic solutions in the literature that can efficiently evaluate surface fields excited on electrically large dielectric coated circular cylinders. Furthermore, to the best of our knowledge, none of the asymptotic solutions yield results along the paraxial (nearly axial) region. This is a well-known problem that has been observed for perfect electrical conducting (PEC) and impedance cylinders in the past. In this paper, a novel space-domain representation for the surface fields excited by an elementary current source is presented. These new expressions are very accurate along the paraxial region and in some cases can be made valid away from the paraxial region with some minor modifications.