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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/77250

    Title: 1.2 m Shielded Cassegrain Antenna for Close-Packed Radio Interferometer
    Authors: 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
    Contributors: 淡江大學物理學系
    Date: 2011-02
    Issue Date: 2012-06-14 09:23:59 (UTC+8)
    Publisher: Chicago: University of Chicago Press
    Abstract: 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.
    Relation: Publications of the Astronomical Society of the Pacific 123(900), pp.198-212
    DOI: 10.1086/658675
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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