Vol . 8 No. 2 April 2000
Cassegrain Antenna System
Cassegrain antenna is a double reflector system which works on the principle of cassegrain optical telescope. It employs a parabolic contour for
the main dish and a hyperbolic contour for the sub dish. One of the two foci of the
hyperbola is the real focal points of the system and is located at the center of the feed;
the other is a virtual focal point which is located at the focus of the parabola.
Cassegrain antenna permits a reduction in the axial dimensions of the antenna just as in
optics and also permits greater flexibility in the design of the feed system.