Double-shell axial-symmetric imaging lens antenna for space applications

This paper describes the design of a double-material imaging lens that focuses incoming off-axis beams into narrowband sensors distributed at the lens base. A shaped double-shell approach is adopted as a strategy for increasing design degrees of freedom as opposed to the classical single-material extended hemispherical lens configuration. The study shows that the new lens configuration improves not only the transmission efficiency but also produces very well defined and highly directive multiple Gaussian beams, with reasonably low beam degradation at the extreme scan angles