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New BOR1 and decoupling efficiencies for characterizing ultra-wideband reflectors and feeds for future radio telescopes

Per-Simon Kildal (Institutionen för signaler och system, Antenner) ; Jian Yang (Institutionen för signaler och system, Antenner) ; Marianna Ivashina (Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling)
Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011 p. 3712-3714 . (2011)
[Konferensbidrag, refereegranskat]

This paper presents some new topics that will be lectured in the December 2011 course within European School of Antennas course on Reflector and Lens Antennas. The new material is mainly related to characterization of wideband feeds for reflector antennas for future radio telescopes, such as for SKA and VLBI 2010. The lectures will contain details of how to design decade bandwidth log-periodic antenna feeds and in particular the so-called eleven feed, as well as focal plane arrays (FPA) for producing multiple beams shaped for optimum system performance. The designs has taken advantages of two newly defined efficiencies that are essential for optimum system performance: i) The socalled BOR1 efficiency characterizing the power loss due to higher order azimuthal variations in the far field function being very important in characterizing decade bandwidth feeds. And, ii) the decoupling efficiency being of importance for characterizing non-uniformly excited arrays such as FPAs, and being related to the classical embedded element efficiencies of normal phased arrays as well as their active (scanned) impedance.



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Denna post skapades 2011-05-03. Senast ändrad 2013-06-26.
CPL Pubid: 140199

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Antenner (2005-2014)
Institutionen för rymd- och geovetenskap, Avancerad mottagarutveckling

Ämnesområden

Informations- och kommunikationsteknik
Elektroteknik och elektronik

Chalmers infrastruktur