ROTARY-JOINT ANTENNA-FEEDER ASSEMBLY WITH MECHANICALLY SCANNED DIRECTIVITY PATTERN Russian patent published in 1998 - IPC

FIELD: microwave antenna engineering; radars using stepless mechanical scanning while rotating directivity pattern to ensure equistrong direction. SUBSTANCE: antenna-feeder assembly has feed scanner, reflector, and counter-reflector. Its center of suspension and axle of antenna revolution are aligned with those of scanner which is formed as two sections of round waveguide of which one is fixed and its end is expanding into conical horn; other section is movable and made of round waveguide with its walls tapered on one end on external side and other end is coupled with antenna horn feed; movable waveguide with tapered walls is inserted into conical horn in a spaced relation; center of suspension of scanner is aligned with center of end shear plane of waveguide with contracting walls; axis of revolution crosses this center; movable waveguide section and feed may be fixed to reflector and counter-reflector of mirror antenna or to members of any other antenna. In addition, to reduce induced noise, internal walls of fixed section expanding part are covered with insulating material and tapered external walls of movable section, with absorbing material. EFFECT: simplified design; reduced loss. 2 cl, 1 dwg