系统工程与电子技术 ›› 2019, Vol. 41 ›› Issue (7): 1474-1481.doi: 10.3969/j.issn.1001-506X.2019.07.06

• 电子技术 • 上一篇    下一篇

FAST宽带双极化多波束馈源设计

何山红1, 解良玉1, 纪萌茜1, 范瑾2, 范冲3   

  1. 1. 安徽工业大学电气与信息工程学院, 安徽 马鞍山 243002;    2. 中国科学院国家天文台FAST项目组,北京 100012;    3. 南京理工大学通信工程系, 江苏 南京 210094
  • 出版日期:2019-06-28 发布日期:2019-07-09

Design of dual polarization and broadband multi beam feed of FAST

HE Shanhong1, XIE Liangyu1, JI Mengqian1, FAN Jin2, FAN Chong3   

  1. 1. School of Electrical Engineering & Information, Anhui University of Technology,Ma’anshan 243002, China;  2. The FAST group in the National Astronomical Observatories,Chinese Academy of Sciences, Beijing 100012, China; 3. Department of Communication Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Online:2019-06-28 Published:2019-07-09

摘要: 双极化和宽带设计可以提高射电天文望远镜的观察效率;多波束技术可以拓宽视场,提高观察速度。利用多个独立的馈源偏焦放置实现的多波束反射面天线,具有结构简单、随频率变化性能稳定等优点。设计了一个针对500 m口径球面望远镜(fivehundredmeter aperture spherical telescope, FAST)的双极化、宽带19波束馈源,给出了馈源的实现方式和测试结果,利用馈源的幅度和相位辐射方向图,计算了由主动球面形成的多波束瞬时抛物反射面天线的性能。分析了剩余球面由于能量泄露对瞬时抛物反射面产生的影响。该系统级的设计方法及设计结果可为FAST将来的频段更换等升级改造提供设计参考和数据参考。

关键词: 多波束天线, 馈源, 宽带, 双极化, 射电天文望远镜

Abstract: In radio telescope,the dual polarization and broadband design is used to improve surveying efficiency, and the multi beam technique is usually employed to widen the field of view and to increase the surveying speed. Multiple independent off focal feeds can form a multi beam reflector antenna. The multi feed per beam reflector antenna has a simple structure but stable performance within wide bandwidth. A dual polarization and broadband 19 beam feed for the five hundred meter aperture spherical telescope (FAST) is designed. Design method, designed and measured results are presented. Based on the primary amplitude and phase radiation patterns of the feed, the performance of the multi beam instantaneous parabolic reflector antenna deformed from an active spherical main reflector in real time is calculated, and the influence of the remaining spherical surface on the illuminated parabolic surface due to leakage energy is analyzed. This system level design method and design results provide design references and data references for the FAST reformation such as frequency band replacement in the future.

Key words: multi beam antenna, feed, broadband, dual polarization, radio telescope