ANTENNA SYSTEM Russian patent published in 2005 - IPC

FIELD: means of communication, applicable in radar equipment for determination of the target coordinates with the aid of monopulse method of direction finding.

SUBSTANCE: directional couplers are used in the waveguide distributors, they have common wide walls and, respectively, large couplings and a lesser frequency dependence. Due to arrangement of the distributors of the second type in the plane, in which the head-lights are turned through a correction angle by the turning device, the approaching of the plane of aperture of the head-lights to the axis of rotation is attained and, respectively both an increase of the area of aperture of the head-lights, and a decrease of the arm of carrying out of the masses (reduction of the requirements to the drive), as well as an increase of the scanning sector in this plane up to 170 deg. The antenna system consists of a two-dimensional monopulse phased antenna array with an electronic beam control, which is installed on the rotating device and made of the rules of radiators connected to the rules of phase shifters, waveguide distributor consisting of directional couplers and main-line waveguides and a microwave-adder. The waveguide distributor is made of M linear distributors of the first type and four linear distributors of the second type containing waveguide directional couplers, whose waveguide channels join each other by wide walls and are combined by common main-line waveguides, M linear distributors of the first type are grouped by quarters and by line carry out the whole aperture of the two-dimensional monopulse phased antenna array. The distributors of the second type are positioned at a right angle to the M linear distributors of the first type, power the main-line waveguides of the linear distributors of the first-type by each of its waveguide outputs, the linear distributors of the first type are oriented in such a way that form at the waveguide outputs of its directional coupler electromagnetic waves H₁₀ with orientation of vector E in parallel with the plane, in which the rotating device accomplishes a turn of the two-dimensional monopulse phased antenna array. The linear distributors of the second type use directional couplers with a longitudinal arrangement of the waveguide channels and the common wide wall, in the zone of the last but one waveguide outputs of the linear distributors of the second type the height of the main-line waveguide is lowered to the height of the waveguide outputs of the linear distributors of the second type, and the last waveguide output of the linear distributors of the second type are formed by turning of the main-line waveguide through 90 deg. In the E plane. The adder and the four linear distributors of the second type are sealed at the outputs of the linear distributors, each input of these distributors is connected to the respective output of the microwave adder. In case it is necessary to turn the plane of polarization 90 deg. Twist joints are installed on each waveguide distributor of the first type, they consist of sections of H-shaped waveguide with slit diaphragms at the input and output.

EFFECT: expanded service frequency band, enhanced efficiency due to the use of directional couplers, having common wide alls and, respectively, large couplings and lesser frequency dependence.

3 cl, 4 dwg