An antenna device comprising: a reflectarray with array antenna elements, an outer feed provided with a first and second feeding waveguide (10, 11), a widening funnel, and a first and a second passive device (12,13) in the form of an iris or an inductive diaphragm, wherein the widening funnel comprises a widened end, said widened end comprising waveguide apertures for illumination of the reflectarray, and the outer feed being arranged to illuminate the reflectarray in an offset arrangement, characterized in that - the feeding waveguides (10, 11) are rectangular, - the passive devices are configured for movement of the phase centre of the antenna feed with frequency relative to the waveguide aperture of the feed, - the first feeding waveguide comprises the first passive device and the second feeding waveguide comprises the second passive device, each of said passive devices being located along one straight wall of the feeding waveguide (10, 11) in which it is located, close to the transition of the feeding waveguides (10, 11) into the widening funnel - the waveguide apertures are six rectangular waveguide apertures arranged in a regular 2x3 matrix in rows with three apertures in each row, wherein each feeding waveguide (10, 11) is arranged to feed a separate row of three waveguide apertures, and - the widening funnel is provided with two beam sections (15, 16) symmetrically arranged in the widening funnel between the feeding waveguides (10, 11) and the waveguide apertures. a reflectarray with array antenna elements, an outer feed provided with a first and second feeding waveguide (10, 11), a widening funnel, and a first and a second passive device (12,13) in the form of an iris or an inductive diaphragm, wherein the widening funnel comprises a widened end, said widened end comprising waveguide apertures for illumination of the reflectarray, and the outer feed being arranged to illuminate the reflectarray in an offset arrangement, characterized in that - the feeding waveguides (10, 11) are rectangular, - the passive devices are configured for movement of the phase centre of the antenna feed with frequency relative to the waveguide aperture of the feed, - the first feeding waveguide comprises the first passive device and the second feeding waveguide comprises the second passive device, each of said passive devices being located along one straight wall of the feeding waveguide (10, 11) in which it is located, close to the transition of the feeding waveguides (10, 11) into the widening funnel - the waveguide apertures are six rectangular waveguide apertures arranged in a regular 2x3 matrix in rows with three apertures in each row, wherein each feeding waveguide (10, 11) is arranged to feed a separate row of three waveguide apertures, and - the widening funnel is provided with two beam sections (15, 16) symmetrically arranged in the widening funnel between the feeding waveguides (10, 11) and the waveguide apertures. - the feeding waveguides (10, 11) are rectangular, - the passive devices are configured for movement of the phase centre of the antenna feed with frequency relative to the waveguide aperture of the feed, - the first feeding waveguide comprises the first passive device and the second feeding waveguide comprises the second passive device, each of said passive devices being located along one straight wall of the feeding waveguide (10, 11) in which it is located, close to the transition of the feeding waveguides (10, 11) into the widening funnel - the waveguide apertures are six rectangular waveguide apertures arranged in a regular 2x3 matrix in rows with three apertures in each row, wherein each feeding waveguide (10, 11) is arranged to feed a separate row of three waveguide apertures, and - the widening funnel is provided with two beam sections (15, 16) symmetrically arranged in the widening funnel between the feeding waveguides (10, 11) and the waveguide apertures.