Broadside array amplitude modulated for scanning

Claim 1

A RADAR ANTENNA SYSTEM COMPRISING A FIXED BROADSIDE ARRAY OF FOUR RADIATING UNITS EACH OF WHICH IS PROVIDED WITH AT LEAST ONE HELICAL RADIATOR ADAPTED TO PROJECT ENERGY IN A DIRECTION COINCIDENT WITH THE AXIS OF THE HELIX, THE RESPECTIVE HELICES OF THE FOUR UNITS BEING SYMMETRICALLY ARRANGED WITH RESPECT TO THE CENTRAL AXIS OF A CONICAL SCANNING PATTERN AND BEING ANGULARLY DISPOSED RELATIVE TO EACH OTHER TO PRODUCE BEAMS ENCOMPASSING THE UP, DOWN, RIGHT AND LEFT QUADRANTS OF SAID PATTERN, A SOURCE OF HIGH-FREQUENCY PULSE ENERGY, A FOUR BRANCH HYBRID NETWORK COUPLING SAID SOURCE TO SAID FOUR RADIATING UNITS TO SUPPLY ENERGY THERETO IN EQUAL AMPLITUDE AND LIKE PHASE, AN AMPLITUDE MODULATOR INTERPOSED BETWEEN EACH UNIT AND SAID HYBRID NETWORK, AND MEANS EFFECTING OPERATION OF SAID MODULATORS IN QUADRATURE RELATION TO PRODUCE A SEQUENTIAL AND CYCLICAL MODULATION OF ENERGY FED TO SAID UNITS, THEREBY CAUSING A CONICAL SCANNING ACTION.