A Wide-band Feed System for SKA Band 1 Covering Frequencies From 350 - 1050 MHz
Paper in proceedings, 2016

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.

cryogenic feed system.

Wideband feed

QRFH

SKA

Author

Bhushan Billade

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Jonas Flygare

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Magnus Dahlgren

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Bo Wästberg

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Miroslav Pantaleev

Chalmers, Earth and Space Sciences, Onsala Space Observatory

10th European Conference on Antennas and Propagation, EuCAP 2016; Davos; Switzerland; 10 April 2016 through 15 April 2016

2164-3342 (ISSN)

Art. no. 7481794-

Infrastructure

Onsala Space Observatory

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/EuCAP.2016.7481794

ISBN

978-889070186-3

More information

Created

10/8/2017