Design of an Asymmetrical Quadruple-ridge Flared Horn Feed: a Solution to Eliminate Polarization Discrepancy in the Offset Reflecting Systems
Paper in proceedings, 2018

Quadruple-ridge Flared Horns (QRFHs) have been showing qualified performance as the feed antennas for the reflecting systems in the Square Kilometre Array (SKA). However, due to the offset optics of the SKA reflecting system, identical
illuminations from dual polarizations of the feed would but result in different system performance. This difference would become more severe towards high frequencies and may cause the worse polarization unqualified for the desired specification. In this paper, an asymmetrical QRFH feed working over Band
B (4.6–24 GHz) is proposed and optimized to tackle this problem.The asymmetrical Band-B feed is composed of two different and orthogonal pairs of both ridges and sidewall quad-pieces, so as to provide orthogonal polarizations but different illuminations. Simulated results show that, by this asymmetrical design different beamwidths and different combinations of sub-efficiencies can be
provided for two polarizations, so as to eliminate the polarization discrepancy over most of the bandwidth. Benefitting from this elimination, both polarizations of the Band-B feed have now achieved the SKA specification in terms of aperture efficiency.

offset reflector antenna

polarization discrepancy

quadruple-ridge flared horn

Author

Bin Dong

Chinese Academy of Sciences

Jian Yang

Chalmers, Electrical Engineering, Kommunikationssystem, informationsteori och antenner, Antennas

Miroslav Pantaleev

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Jonas Flygare

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Bhushan Billade

Chalmers, Space, Earth and Environment, Onsala Space Observatory

IET Conference Publications

Vol. 2018 CP741

12th European Conference on Antennas and Propagation (EuCAP 2018)
London, United Kingdom,

Key Technology Developments for Ultra-Wideband Array Radio Astronomy Systems and Investigation of New Concepts for Future Millimeter and Terahertz Radio Telescopes

The Swedish Foundation for International Cooperation in Research and Higher Education (STINT), 2016-06-15 -- 2019-06-30.

Driving Forces

Sustainable development

Infrastructure

Onsala Space Observatory

Subject Categories

Earth and Related Environmental Sciences

Electrical Engineering, Electronic Engineering, Information Engineering

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Latest update

1/21/2019