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

Författare

Bin Dong

Chinese Academy of Sciences

Jian Yang

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Antennsystem

Miroslav Pantaleev

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Jonas Flygare

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Bhushan Billade

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

IET Conference Publications

Vol. 2018 CP741

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

Nyckelteknologi Utveckling för Ultrabredband Gruppantenn Radio Astronomisystem och undersökning av nya Begrepp för framtida millimeter och Terahertz radioteleskop

STINT, 2016-06-15 -- 2019-06-30.

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Ämneskategorier

Geovetenskap och miljövetenskap

Elektroteknik och elektronik

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2019-01-21