淡江大學機構典藏:Item 987654321/77250
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 57524/91039 (63%)
造访人次 : 13505987      在线人数 : 357
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/77250


    题名: 1.2 m Shielded Cassegrain Antenna for Close-Packed Radio Interferometer
    作者: 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
    贡献者: 淡江大學物理學系
    日期: 2011-02
    上传时间: 2012-06-14 09:23:59 (UTC+8)
    出版者: Chicago: University of Chicago Press
    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.
    關聯: Publications of the Astronomical Society of the Pacific 123(900), pp.198-212
    DOI: 10.1086/658675
    显示于类别:[物理學系暨研究所] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    0004-6280_123(900)p198-212.pdf843KbAdobe PDF0检视/开启
    index.html0KbHTML161检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈