An omni directional coverage multibeam antenna relief on a ground surface having simple conical shapes to provide beam steering. One advantage of such a system is that the projected area is always constant and broadside to the intended direction resulting in limited scan loss effects. In the case of...http://www.google.fr/patents/US5940048?utm_source=gb-gplus-shareBrevet US5940048 - Conical omni-directional coverage multibeam antenna
