ANTENNA DEVICE FOR MONO-PULSE RADAR SYSTEM Russian patent published in 2021 - IPC H01Q19/08 G01S13/44 

FIELD: antennas.

SUBSTANCE: invention relates to antenna technology, in particular, to antennas for a monopulse radar system on an unmanned aerial vehicle. The technical result is achieved in that the antenna device of a monopulse radar system containing a sum-difference converter connected to a feed, a movable reflector with an antenna drive and a fixed counterreflector, differs from the prototype in that the movable reflector is made in the form of a paraboloid with a cut off upper segment, a fixed counterreflector is made in the form of a plate, the projection of which on the vertical plane of symmetry of the antenna device is located obliquely, at an angle of 22.5° to the projection on the same plane of the movable reflector in its neutral position, the four-channel feed connected to the sum-difference converter is installed in the segment of the movable reflector that's freed after the cut, is bent towards the fixed counter-reflector with the center of its front end located at the focal point of the movable parabolic reflector in its neutral position and consists of the rear and front end four-channel two-channel sections and a straight connecting two-channel section, which is docked with the above-mentioned lower and upper final four-channel sections by means of two four-channel sections rotatable at an angle of 22.5° in the form of sectors of a toroidal waveguide, and to compensate for the difference in the length of the outer and inner pair of channels of the rotating sections of the feed between internal pairs of channels of the first and second rotary four-channel sections, symmetrically relative to the plane of symmetry of the feed, two compensation sections are inserted, while the counter-reflector plate is made of radio-transparent material, on which a linear polarization selector is applied, reflecting electromagnetic waves with vertical polarization and transmitting electromagnetic waves with horizontal polarization, the movable reflector is made with an element for transforming the polarization of the reflected signal into the perpendicular direction of polarization, which is made in the form of a linear polarization selector rotated at an angle of 45° to the direction of both horizontal and vertical polarization, and located at a distance of one quarter of the wavelength of the radio signal from the short-circuit reflective layer.

EFFECT: said invention is aimed at providing the maximum possible antenna gain with a limited diameter of the reflector, turning in two mutually perpendicular directions relative to the longitudinal axis of the antenna, as well as expanding the operating frequency band of the antenna to increase the noise immunity of the radar.

2 cl, 5 dwg