DocumentCode :
998427
Title :
The efficiency of near-field Cassegrainian antennas
Author :
Fitzgerald, William
Author_Institution :
M.I.T. Lincoln Lab., Lexington, MA, USA
Volume :
20
Issue :
5
fYear :
1972
fDate :
9/1/1972 12:00:00 AM
Firstpage :
648
Lastpage :
650
Abstract :
The aperture efficiency of a near-field Cassegrainian antenna is approximated with a Fresnel field analysis. Curves are presented which give the efficiency of the system in terms of the amplitude distribution on the feed aperture and the Raleigh distance to the subreflector. It is found that separation between feed aperture and subreflector can be as great as 
without excessive loss.
without excessive loss.Keywords :
Reflector antennas, multireflector; Antenna measurements; Antenna radiation patterns; Antennas and propagation; Apertures; Diffraction; Impedance; Radar; Size measurement; Teeth; Testing;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1972.1140269
Filename :
1140269
Link To Document :
