ABSTRACT
Radar technology developed in 1940 to 1965 was based on the use of antennae providing directional beams incorporating mechanical rotation. Usually, parabolic reflectors were employed to develop directive beam antennae based on the geometrical properties of reflectors. Depending on the requirements, various technologies have been employed, such as parabolic cylinders, paraboloids, offset focus paraboloids, and various types of lenses. One of the difficulties with these antennae has been their threedimensional structure, which is quite large.
