Patent ID: 8102324

Claim:
Sub-reflector of a dual-reflector antenna comprising: a first end having a junction of a first diameter, adapted for coupling to the end of a waveguide ( 3 ), a second end, having a second diameter greater than the first diameter, a convex reflective internal surface ( 12 ) placed at the second end having an axis of revolution ( 13 ), an external surface ( 14 ) of the same axis ( 13 ), joining the two ends, a dielectric material ( 11 ) extending between the first and the second end and limited by the internal surface ( 12 ) and the external surface ( 13 ), characterized in that the external surface ( 14 ) has a convex profile described by a polynomial equation of the sixth degree of the formula: y=ax 6 +bx 5 +cx 4 +dx 3 +ex 2 +fx+g where a is not zero.