Technology
The sub-reflector of Toroidal offers flexibility of
design for reflecting telescopes. The classical arrangement introduced by
N. Cassegrain of France uses a sub-reflector of hyperbolic shape which
surrounds the prime focus of the main parabolic reflector. There are some
variations and Gregorian reflector has an ellipsoid as a sub-reflector.
|
 |
TOROIDAL dual reflector antenna is
similar to Gregorian reflector in shape, but the basic formula differs
from it. The sub-reflector of Toroidal antenna is from a virtual toroid,
but the main reflector is analogous to an ellipsoid. There is no parabolic
formula. This system has a convex - concave sub-reflector. This
sub-reflector is convex in one plane and concave in orthogonal plane. The
complete shape of them are obtained through elaborate mathematical and
physical calculation.
|
The
illustration below shows how the signals travel through the main & sub
reflectors.
|
