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A Wide-band Feed System for SKA Band 1 Covering Frequencies From 350 - 1050 MHz

Bhushan Billade (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Jonas Flygare (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Magnus Dahlgren (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Bo Wästberg (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Miroslav Pantaleev (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
10th European Conference on Antennas and Propagation, EuCAP 2016; Davos; Switzerland; 10 April 2016 through 15 April 2016 (2164-3342). p. Art. no. 7481794. (2016)
[Konferensbidrag, refereegranskat]

We present the design of a wideband feed system for the Band 1 of the Square Kilometer Array (project). The Band 1 feed system uses a quad-ridged flared horn (QRFH) optimized for a offset Gregorian dual reflector dish to cover RF frequencies from 350 - 1050 MHz, and a cryogenic low noise amplifier (LNA). The feed horn is optimized to achieve best Aeff/Tsys over the entire band, by making trade-off between aperture efficiency and spill over noise contribution. The optimised feed horn shows above 70% efficiency over the entire 3:1 band, with return loss better than 10 dB. The cryostat following the feed has between 9 to 14 K noise, measured at the co-axial connector of the QRFH. The estimated on-sky sensitivity of the feed system is better than specified 4.2 m2/K averaged over the entire frequency band.

Nyckelord: QRFH, Wideband feed, SKA, cryogenic feed system.


Conference: 10th European Conference on Antennas and Propagation (EuCAP) Location: Davos, SWITZERLAND Date: APR 10-15, 2016



Denna post skapades 2016-12-06. Senast ändrad 2017-07-12.
CPL Pubid: 245874

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur

Onsala rymdobservatorium