An electronic scan system with excitation arrangement for producing a directive radiation pattern from a circular or cylindrical array at a predetermined pointing angle.PPThe circular or cylindrical array provides random beam pointing. An RF input-output port feeds an equal amplitude distribution network providing as many outputs as there are elements of the array employed at any given time. An equal number of phase shifters is included, and gross beam positioning is effected through selection of the contiguous element group to be excited by means of RF switching. The phase shifters may then be controlled to provide the specific beam pointing or scan desired within the selected sector. The antenna elements of the array are fed through a passive interconnecting matrix responsive thereto, said matrix providing inherent amplitude taper across the effective aperture. The passive interconnecting matrix replaces the more complicated and expensive "ordering" matrix employed in prior art systems of the same general type.
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