MULTIBEAM DOUBLE-REFLECTOR ANTENNA WITH SHIFTED FOCAL AXIS Russian patent published in 2016 - IPC H01Q5/00 

FIELD: radio engineering.

SUBSTANCE: invention is intended for use in radio devices for television, radio broadcast and radio communication through artificial Earth satellites (AES), located in geostationary orbit (GSO), in centimetre and millimetre wave ranges. Disclosed multibeam double-reflector antenna with shifted focal axis consists of a system of radiators, arranged on circular arc, main large mirror-reflector and auxiliary small mirror-convergent mirror, sections of which in plane of arc of irradiators is circles concentric to arc of radiators and having, compared thereto, larger and smaller radii, respectively, wherein each of mirrors consists of two halves symmetrical relative to plane of arc of irradiators, where in plane perpendicular to plane of symmetry of reflector, each half of which has shape of a monotonous part of a parabola with displacement of focal axis relative to plane of symmetry, each half of convergent mirror has shape of a hyperbola, convex towards reflector and positioned so that first focal points of two halves of section of hyperbola are located on arc of arrangement of radiators, and second focal points coincide with focal points of parabolas, forming half of main mirror reflector.

EFFECT: technical result consists in improvement of efficiency of antenna while reducing level of cross-polarisation and creation of a fan-shaped directional pattern.

1 cl, 2 dwg