Journal ArticleDOI
Performance of offset paraboloid reflectors with offset matched feeds
A. A. Zaghloul,L. Shafai +1 more
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In this article, the performance of offset reflector antennas with offset matched feeds is investigated, and both scalar aperture and vector current methods are used to compute the patterns accurately, but always yield lower cross-polarization levels than the vector current method.Abstract:
The performance of offset reflector antennas with offset matched feeds is investigated. Mathematical expressions for the reflector pattern calculations are presented, and both scalar aperture and vector current methods are used to compute the patterns. It is found that the scalar aperture method can predict the co-polar patterns accurately, but always yields lower cross-polarization levels than the vector current method. The cross-polarization of the reflector for various feed displacements and polarizations is also investigated. The results indicate that displacing the feed along the reflector axis of symmetry yields lower cross-polarizations and, in particular, when the feed displacement is towards the reflector side, the level of the cross-polarization decreases initially with the feed displacement.read more
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Journal ArticleDOI
Performance of offset parabolic reflectors illuminated by matched feeds
TL;DR: The theoretical concept of applying matching primary feed devices to illuminate offset parabolic reflectors is studied in this paper, where the physical interpretation of how this new class of feeds compensates for the geometric asymmetry of the offset system is explained.
References
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Book
Microwave antenna theory and design
TL;DR: This book discusses microwave antenna design problems, circuit relations, reciprocity theorems, and antenna measurements - techniques.
Journal ArticleDOI
The definition of cross polarization
TL;DR: There are at least three different definitions of cross polarization used in the literature, and the definition which corresponds to one standard measurement practice is proposed as the best choice.
Journal ArticleDOI
Lateral-feed displacement in a paraboloid
TL;DR: In this article, the beam shift and degradation of a paraboloidal reflector with an offset feed is analyzed by the scalar plane wave theory, and the beam characteristics for a tapered circularly symmetric illumination are presented.
Journal ArticleDOI
New class of primary-feed antennas for use with offset parabolic-reflector antennas
A.W. Rudge,N.A. Adatia +1 more
TL;DR: In this paper, the authors describe a new class of primary-feed antennas which overcome the offset reflectors' depolarising and beam-squinting properties, which offer a significant improvement in the cross-polar and beamsquinted properties of the primary reflector antenna, without adding significantly to the complexity or mass.
Journal ArticleDOI
Multiple-beam antennas: Offset reflectors with offset feeds
TL;DR: In this article, two simple mathematical models are described for the prediction of the vector radiation fields from offset parabolic reflector antennas with offset feeds, and experimental support for the predictions obtained from the models has been obtained by comparisons with measured data from antenna systems operating at 30 GHz.
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