Design and measurement of a portable low-noise aerial
作者:
D.Herbison-Evans,
I.D.R.Smith,
期刊:
Proceedings of the Institution of Electrical Engineers
(IET Available online 1968)
卷期:
Volume 115,
issue 1
页码: 91-93
年代: 1968
DOI:10.1049/piee.1968.0014
出版商: IEE
数据来源: IET
摘要:
In order to investigate the reduction of aerial noise from a small dish with its mainbeam at a low elevation, a 112cm-diameter circular symmetric paraboloid was mounted with a 45° flat plate. The combination was fed so that when the mainbeam was horizontal the feed spillover was predominantly upward. A Dicke-type radiometer is described with synchronously switched i.f. attenuators and a resolution of 10deg K. This was used to investigate the aerial noise against mainbeam elevation angle at 9.6GHz of the dish plus the 45° plate. The aerial noise temperature showed a broad minimum around 30° elevation as expected. The possibility of trading dish size for cryogenic complexity is discussed.
点击下载:
PDF
(467KB)
返 回