Compact asymmetrical double-reflector antenna

A double-reflector antenna comprising:

• a main reflector and a sub-reflector, each of which being made with nonaxisymmetric curvilinear surfaces and having two symmetry planes at which intersection a longitudinal axis Z is located;
• and
• at least a feed arranged between the main reflector and the sub-reflector with the capacity of illuminating, first, the sub-reflector and then, through it, the main reflector to allow for a plane wave-front,
• wherein the common focuses of the nonaxisymmetric curvilinear surfaces of the main reflector and the sub-reflector in all sections pass through the longitudinal axis Z of the antenna, and the sub-reflector faces the main reflector in a convex shape along the longitudinal axis Z, and the generatrix of the nonaxisymmetric curvilinear surfaces of the sub-reflector is defined in spherical coordinates r(θ,φ) as:
• r
• ⁡
• (
• θ
• ,
• φ
• )
• =
• r
• ⁡
• (
• 0.0
• )
• P
• m
• ⁡
• (
• θ
• ,
• φ
• )
• ,
• where Pm(θ,φ) is a polynomial of m-degree, and κ, φ are angles in spherical coordinates, and the relation I=H/Dmax is realized within the limits of 0.24<I<0.35, where H is the antenna maximum size along the longitudinal axis Z, and Dmax is the maximum transverse size of the main reflector aperture.