[en] SHAPED SUBREFLECTOR FOR OFFSET GREGORIAN REFLECTOR ANTENNA WITH A PARABOLOIDAL MAIN REFLECTOR

[pt] JOSE RICARDO BERGMANN

[pt] LUIS CLAUDIO PALMA PEREIRA

[en] The shaped dual offset reflector antenna configuration is considered to yield the best radiation pattern performance for FSS ground stations operating in a small angle satellite spacing environment, where the present trend is a continuo tightening of offaxis radiation levels specifications. When properly designed and fitted with a low crosspolarization primary feed, the shaped dual offset reflector antenna radiation pattern can easily meet the present ITU-R recommendation (29- 25log(6)), achieving simultaneously high aperture efficiencies, above go per cent, and low levels for the crosspolarization peaks in the azimuth radiation pattern plane. However, widespread utilization of this configuration is still curbed by the higher manufacture costs when these are compared, for instance, with the cost required for the manufacture of symmetrical dual reflector antennas. In this paper, the possibility of reducing the manufacture costs for the dual offset configuration is explored by utilizing the parabolic offset reflector as the main reflector, and shaping only the subreflector. This solution can be very cost reduction effective, particularly for manufacturers that already have a highly diversified production of single offset antennas. Selected reflectors could then be easily utilized as the main reflector in a dual offset design fit with a suitably shaped subreflector. This configuration when compared with the classical one has the advantage of hrnishing the higher efficiency considered compatible with the double offset configuration.

2013-02-22

[pt] TEXTO

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INGLÊS

https://www.maxwell.vrac.puc-rio.br/colecao.php?strSecao=resultado&nrSeq=21202@2