The electromagnetic theory of three-dimensional inhomogeneous lenses

The characteristics of some inhomogeneous lenses are investigated. The lenses covered are the Luneburg, the Eaton-Lippmann, and the Eaton. Radiation patterns and the bistatic scattering cross sections for the small-diameter lenses as well as the directivity and the distribution of the energy around the geometrical focus of the Luneburg lenses are numerically computed and examined in detail.