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標題:1.2 m Shielded Cassegrain Antenna for Close-Packed Radio Interferometer
學年99
學期2
出版(發表)日期2011/02/01
作品名稱1.2 m Shielded Cassegrain Antenna for Close-Packed Radio Interferometer
作品名稱(其他語言)
著者Koch, Patrick M.; Raffin, Philippe; Huang, Yau-de; Chen, Ming-tang; Han, Chih-chiang; Lin, Kai-yang; Altamirano, Pablo; Granet, Christophe; Paul, T.P.; Ho, Chih-wei; Huang, L.; Kesteven, Michael; Li, Chao-te; Liao, Yu-wei; Liu, Guo-chin; Nishioka, Hiroaki; Ong, Ching-long; Oshiro, Peter; Umetsu, Keiichi; Wang, Fu-cheng; Wu, Jiun-huei Proty
單位淡江大學物理學系
出版者Chicago: University of Chicago Press
著錄名稱、卷期、頁數Publications of the Astronomical Society of the Pacific 123(900), pp.198-212
摘要Interferometric millimeter observations of the cosmic microwave background and clusters of galaxies with arcmin resolutions require antenna arrays with short spacings. Having all antennas co-mounted on a single steerable platform sets limits to the overall weight. A 25 kg lightweight novel carbon-fiber design for a 1.2 m diameter Cassegrain antenna is presented. The finite element analysis predicts excellent structural behavior under gravity, wind and thermal load. The primary and secondary mirror surfaces are aluminum coated with a thin TiO2 top layer for protection. A low beam sidelobe level is achieved with a Gaussian feed illumination pattern with edge taper, designed based on feedhorn antenna simulations and verified in a far field beam pattern measurement. A shielding baffle reduces inter-antenna coupling to below ∼ -135 dB. The overall antenna efficiency, including a series of efficiency factors, is estimated to be around 60%, with major losses coming from the feed spillover and secondary blocking. With this new antenna, a detection rate of about 50 clusters per year is anticipated in a 13-element array operation.
關鍵字
語言英文
ISSN0004-6280; 1538-3873
期刊性質國外
收錄於SCI
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式紙本
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