Patent ID: 6421025
Filing Date: 2002-07-16
Classification: H01Q

Abstract:
An antenna for small-size target and rocket acquisition of a radar station, said antenna comprising a radiating aperture (1) and a microwave section including a system of four E-H tees (2), three of which are folded in the E-plane, a circulator (3), microwave lines (4), (5), (6), (7) for connecting to a receiver and to a transmitter of the radar station, azimuth and elevation drives (3) and (9), said antenna being characterized in thatsaid radiating aperture (1) comprises subarrays (10) of the same type, each provided with a feed system (13) comprising series or parallel microwave transmission lines, a phasing system (12) with electrically controlled phase shifters (15), a radiation system (11) of discrete radiators (14) disposed within the aperture (1) equidistantly at a distance of two or more wavelengths from each other, and a beam control system (17) which is common for all the subarrays, wherein a number of outputs of the feed systems is equal to a number of controllable phase shifters (15), and a number of inputs thereof is equal to four, and wherein each radiator (14) is connected to its respective electrically controlled phase shifter (15) of the phasing system (12) connected to the output of one of the feed systems (13), the control inputs of the phase shifters (15) are connected to the outputs of the beam control system (17), and the four inputs (16) of the feed systems (13) are for connection via the system of E-H tees (2) and circulator (3) to the receiver and to the transmitter of the radar station.