Antenna feed arrangement for correcting for astigmatism

A feed arrangement for use in an antenna, the feed arrangement comprising:

• at least one feed element including a predetermined aperture and capable of launching or receiving a beam of electromagnetic energy along a feed axis of the antenna;
• a first cylindrical reflector disposed to reflect a beam launched by the at least one feed element along the feed axis of the antenna;
• a second cylindrical reflector disposed along the feed axis of the antenna between the first cylindrical reflector and an aperture of the antenna, the flat axes across the first and second cylindrical reflectors being oriented orthogonal to each other along the feed axis of the antenna;
• and
• a first and a second plate comprising a conductive material disposed with major exposed surfaces thereof parallel to each other, the first and second plates enclosing the area between two opposing edges of both the at least one feed element and the first cylindrical reflector and extending along the feed axis of the antenna to form an aperture at the ends of the plates which is a predetermined distance from the second cylindrical reflector;
• the at least one feed element, first and second cylindrical reflectors and the aperture of the plates being oriented with respect to the aperture of the antenna to provide a first and a second phase center for two principal planes of curvature of the wavefront illuminating the aperture of the antenna which are a predetermined distance apart along the feed axis of the antenna.