Title :
An array fed tri-reflector system for wide angle beam scanning
Author :
Werntz, P.C. ; Bailey, M.C. ; Takamizawa, K. ; Stutzman, W.L.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
The design of a large high-gain reflector system capable of wide beam scanning and suitable for geostationary applications involves the following constraints: minimization of feed motion; minimization of feed array size; maximization of primary aperture efficiency; and minimization of reflector motion. A trireflector antenna configuration is presented which appears to meet these constraints. The purpose of this reflector configuration is to allow for beam scanning with a minimum of reflector motion and no array motion. The configuration consists of a parabolic main reflector, an elliptic subreflector in a Gregorian configuration, and a shaped tertiary reflector. Analysis of the trireflector´s scan performance was performed using physical optics at 2.5 GHz, corresponding to a main reflector diameter of 208 lambda .<>
Keywords :
antenna feeders; antenna radiation patterns; microwave antennas; physical optics; reflector antennas; scanning antennas; 2.5 GHz; Gregorian configuration; UHF; array fed tri-reflector system; elliptic subreflector; parabolic main reflector; physical optics; radiation patterns; shaped tertiary reflector; trireflector antenna configuration; wide angle beam scanning; Apertures; Feeds; Frequency; Least squares methods; Low earth orbit satellites; Microwave antennas; NASA; Optical waveguides; Phased arrays; Shape;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.222019
