Double-shell modified extended hemispherical lens feed for reflectors in scanning applications

A new dielectric lens antenna configuration is described, intended to feed a quasi-optical imaging reflector system. The lens is fed at its base by a 5 pixel array, each one producing an output beam after the reflector with near 61 dBi directivity. The lens is designed in such a way that it produces virtual foci outside the lens body, close to the reflector focal arch. The lens plus reflector system provides a maximum scanning angle of α = ±0.36° in elevation with gain scan loss below 1.1dB, while a mechanical rotation of the reflector produces azimuth scan.