Cassegrain dual reflector antenna design
Abstract
A folded optics reflector system could mitigate problems associated with the pointability and controllability of the large UHF antenna for MSAT. Such a system is comprised of a parabolic main reflector and a hyperboloidal subreflector (Cassegrain arrangement) or an ellipsoidal subreflector (Gregorian arrangement), either of which brings the feed closer to the main reflector. By shaping the subreflector and the main reflector, an improved scan capability might be achieved and the size of the required feed aperture-per-beam could be reduced. In such a shaped dual reflector system, the need for overlapping cluster feed arrangement and its concomitant beam forming network could be removed. In this system, a relatively low gain feed element together with the shaped subreflector would be sufficient to produce the required high illumination taper that at the main reflector.
- Publication:
-
In its Land Mobile Satellite Serv. (LMSS): A Conceptual System Design and Identification of the Critical Technol. 8 p (SEE N82-28330 19-17
- Pub Date:
- February 1982
- Bibcode:
- 1982lmss.reptU.....
- Keywords:
-
- Antenna Design;
- Cassegrain Antennas;
- Msat;
- Parabolic Reflectors;
- Satellite Antennas;
- Subreflectors;
- Alignment;
- Antenna Feeds;
- Apertures;
- Hyperbolas;
- Land Mobile Satellite Service;
- Space Communications, Spacecraft Communications, Command and Tracking