A circularly polarized conical beam spherical slot array antenna

This paper proposes a circularly polarized conical beam spherical slot arra y antenna which is suitable for a low elevation angle land mobile satellite communication subscriber. The structure of this antenna type is very simpl e to fabricate; i.e. a ring of perpendicular slot pairs is cut on an outer surface of a concentric conducting spherical cavity. From the assumption of weak coupling of the slots from the cavity, the conical beam pattern can b e obtained. Experimental results that verify the conical beam radiation are in good agreement with the design.