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http://dx.doi.org/10.5140/JASS.2006.23.4.327

GAIN DEGRADATION OF KVN 21-M SHAPED CASSEGRAIN ANTENNA DUE TO MISALIGNMENT OF ANTENNA OPTICS  

Chung Moon-Hee (Radio Astronomy Division, KASI)
Byun, Do-Young (Radio Astronomy Division, KASI)
Khaikin Vladimir B. (The Special Astrophysical Observatory of RAS)
Publication Information
Journal of Astronomy and Space Sciences / v.23, no.4, 2006 , pp. 327-336 More about this Journal
Abstract
In this paper, gain loss of KVN (Korean VLBI Network) 21-m shaped Cassegrain antenna due to misalignment of antenna optics is calculated using ray-tracing method. It enables us to estimate alignment tolerances of feed and sub-reflector positioning. According to numerical results, KVN 21-m shaped Cassegrain antenna's gain loss is more sensitive to positions of feed and sub-reflector than in case of the equivalent classical Cassegrain antenna. The result of calculation is believed to be utilized as a possible guideline when checking the performance of the antenna system.
Keywords
ray tracing; antenna optics; shaped Cassegrain antenna; alignment tolerance;
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