ANTENNA SYSTEM

PURPOSE:To suppress the reduction of a gain and to improve a side rope characteristic by making the aperture distribution of a main reflection mirror into a non-rotation symmetry by mirror-correcting the main reflection mirror and a sub-reflection mirror. CONSTITUTION:When an orthogonal coordinate system x-y with a center 0 of an aperture as an original point is determined, an electric field radiated from a primary radiator 1 is reflected by a mirror surface system, and thereafter, the main reflection mirror 5 and a sub-reflection mirror 4 are mirror- corrected so that the amplitude distribution when the field arrives at the aperture surface 6 of the main reflection mirror 5 can be different in the surface of x=0 and in the surface y=0. Consequently, when the surface of x=0 and a uniform distribution and the surface of y=0 is a taper distribution, the uniform distribution contributes to the improvement of the gain and the low side rope in the surface of y=0. The side rope characteristic in the surface of x=0 is deteriorated more than the case of the rotation symmetrical distribution.