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题名: Design of Dual Circularly Polarised 2-15 GHz Feed and the Polarisation Degree Measurement for CSRH-II Antenna System
作者: Li, Sha1, 2; Yan, Yi Hua1, 2; Chen, Zhi Jun1, 2; Wang, Wei1, 2; Zhang, Fu Shun3
刊名: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
出版日期: 2015-04-14
卷号: 32
关键词: circularly polarised ; polarisation degree ; reflector antenna
DOI: 10.1017/pasa.2015.14
文章类型: Article
英文摘要: The Chinese Spectral Radioheliograph is an aperture-synthesis telescope observing the Sun in ultra wide bandwidth on the ground. It contains two arrays Chinese Spectral Radioheliograph-I and Chinese Spectral Radioheliograph-II from 0.4 to 15 GHz. In order to obtain ultra wide-band performance, the cascaded folded dipoles are used in this feed. At the same time, in order to get circularly polarised signals coming from the Sun, a wide-band 90 degrees hybrid is added in the output ports of the feed. This feed has characteristics of about 10 dBi gain, less than 1.5 voltage standing wave ratio. It also has characteristics with low axial ratio, fixed phase centre location, and constant beam width in operating frequencies. Through cross-correlating all combinations of two orthogonal polarisations at each antenna, the polarisation state of the waves is measured and give a differential instrumental delay between two data channels. The relationship between the own polarisation degree of the Sun and the observed polarisation degree is also measured for cross-polarised delay in observing the Sun in this paper.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: RADIOHELIOGRAPH
收录类别: SCI
语种: 英语
WOS记录号: WOS:000353035300001
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15784
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ China, Key Lab Solar Act, Beijing, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China
3.Xidian Univ, Xian, Peoples R China
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