Electronic scanning radar system

Claim 1

AN ELECTRONIC SCANNING RADAR SYSTEM COMPRISING MEANS FOR GENERATING FIRST AND SECOND SIGNALS HAVING FIRST AND SECOND FREQUENCIES, RESPECTIVELY, SAID FIRST FREQUENCY BEING HIGHER THAN SAID SECOND FREQUENCY; MEANS RESPONSIVE TO SAID FIRST AND SECOND SIGNALS FOR PRODUCING A THIRD SIGNAL OF A FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN SAID FIRST AND SECOND FREQUENCIES AND A FOURTH SIGNAL OF A FREQUENCY EQUAL TO THE SUM OF SAID FIRST AND SECOND FREQUENCIES; FIRST AND SECOND DELAY LINES EACH HAVING FIRST AND SECOND EXTREMITIES, RESPECTIVELY; MEANS FOR APPLYING SAID THIRD SIGNAL TO SAID FIRST EXTREMITY OF SAID FIRST DELAY LINE; MEANS FOR APPLYING SAID FOURTH SIGNAL TO SAID SECOND EXTREMITY OF SAID SECOND DELAY LINE; MEANS FOR COUPLING ENERGY FROM SAID FIRST DELAY LINE AT M SPACED POINTS THEREALONG NUMBERED IN ASCENDING SEQUENCE FROM SAID FIRST EXTREMITY TOWARDS SAID SECOND EXTREMITY WHEREIN M IS AN INTEGER NO LESS THAN TWO; MEANS FOR COUPLING ENERGY FROM M POINTS ALONG SAID SECOND DELAY LINE, SAID M POINTS BEING NUMBERED IN ASCENDING SEQUENCE FROM SAID FIRST EXTREMITY TOWARDS SAID SECOND EXTREMITY AND BEING SPACED TO PROVIDE INTERVALS THEREBETWEEN THAT ARE PROPORTIONAL TO THE ELECTRICAL DISTANCE BETWEEN LIKE-NUMBERED POINTS OF SAID FIRST DELAY LINE; M MIXERS RESPONSIVE TO THE SIGNAL ENERGY COUPLED FROM SAID FIRST AND SECOND DELAY LINES AT EACH PAIR OF THE M PAIRS OF POINTS THEREALONG, RESPECTIVELY, FOR PRODUCING M OUTPUT SIGNALS OF THE SAME FREQUENCY HAVING A DETERMINABLE PHASE DIFFERENCE THEREBETWEEN; AN ANTENNA UNIT COMPRISING M LINEAR ARRAYS OF RADIATING ELEMENTS, SAID M LINEAR ARRAYS BEING COEXTENSIVELY DISPOSED IN A COMMON PLANE; MEANS FOR COUPLING SUCCESSIVE OUTPUT CIRCUITS OF SAID M MIXERS, RESPECTIVELY, TO SUCCESSIVE ONES OF SAID M LINEAR ARRAYS OF SAID ANTENNA UNIT THEREBY TO GENERATE A PENCIL-SHAPED BEAM OF ELECTROMAG-