DocumentCode :
1015718
Title :
The effect of slowly varying surface errors in large millimeter wave antennas: A practical verification in the Itapetinga 45-ft reflector
Author :
Kaufmann, Pierre ; Schaal, R.E. ; Raffaelli, J.C.
Author_Institution :
CRAAM/ON/CNPq-Conselho Nacional de Desenvolvimento Cíentifico e Tecnologico, SP, Brazil
Volume :
26
Issue :
6
fYear :
1978
fDate :
11/1/1978 12:00:00 AM
Firstpage :
854
Lastpage :
857
Abstract :
The aperture efficiency of the 45-ft Itapetinga reflector was found to be about 50 percent at 
mm. The reflector surface panels were mechanically measured in 2664 points displaying the presence of slowly varying errors that negligibly effect the aperture efficiency. We confirm that the reflector\´s aperture efficiency seems to be predictable from mechanical measurements of the surface when the distribution of errors is non-Gaussian, when the surface is only slightly rough in terms of a wavelength, and when the slowly varying errors across the surface are known [1], [2].
mm. The reflector surface panels were mechanically measured in 2664 points displaying the presence of slowly varying errors that negligibly effect the aperture efficiency. We confirm that the reflector\´s aperture efficiency seems to be predictable from mechanical measurements of the surface when the distribution of errors is non-Gaussian, when the surface is only slightly rough in terms of a wavelength, and when the slowly varying errors across the surface are known [1], [2].Keywords :
Antenna mechanical factors; Millimeter-wave antennas; Radio telescopes; Reflector antennas; Antenna measurements; Aperture antennas; Extraterrestrial measurements; Feeds; Mechanical variables measurement; Performance evaluation; Reflector antennas; Rough surfaces; Surface roughness; Surface waves;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1978.1141946
Filename :
1141946
Link To Document :
