Radiation from 3D sources in the presence of 2D composite objects

Antennas consisting of three-dimensional (3D) radiating elements (sources) and two-dimensional (2D) structures can be analyzed by using a spectrum of two-dimensional solutions (S2DS) as described by Kildal et al. (see ESA Workshop on Active Antennas, p.P12-1-16, June 1992). Such antennas are, for example, dipoles on long and narrow ground planes, and slots in a cylindrical surface. Generally, any antenna consisting of slots or dipoles in or in the vicinity of 2D structures of arbitrary cross-sectional shape and material combination can be analyzed by the S2DS technique. The paper presents a computer code developed for this general case. The computer code developed for the analysis of radiation and scattering from 2D structures with 3D sources (and oblique plane wave incidence) has been verified against an analytic solution for scattering from a dielectric coated metal cylinder.