Journal ArticleDOI
Proposed high-efficiency spherical-reflector antenna
P.J.B. Clarricoats,S.H. Lim +1 more
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In this article, an additional subreflector is introduced between the Gregorian corrector and the spherical reflector, in order to cause the power of the feed horn to be uniformly distributed over the main reflector aperture.Abstract:
A technique is proposed for raising the efficiency of sphereical-reflector antennas embodying the Gregorian method of phase correction. The method is based on the Galindo-Williams modified Cassegrain antenna. An additional subreflector is introduced between the Gregorian corrector and the spherical reflector, in order to cause the power rom the feed horn to be uniformly distributed over the main reflector aperture. Equations are presented which enable the co-ordinates of the subreflectors to be computed. Two examples are given and a theoretical effieciency of 93% is predicted in one case.read more
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Journal ArticleDOI
The Arecibo upgrading: electrical design and expected performance of the dual-reflector feed system
P.-S. Kildal,L. Baker,T. Hagfors +2 more
TL;DR: In this article, the electrical design and predicted performance of a dual-reflector feed for the fixed spherical reflector of the Arecibo radio telescope were described, and the selection of an optimized geometry for the full-size Gregorian was detailed.
Journal ArticleDOI
Optimum design of a Gregorian-corrected spherical-reflector antenna
TL;DR: In this article, the performance of spherical reflector antennas with Gregorian correctors is investigated with particular reference to their application in satellite-communications ground stations, and an optimum subreflector profile is chosen on the basis of maximum overall efficiency for a particular feed and antenna-scan angle.
Journal ArticleDOI
Development of a dual-reflector feed for the Arecibo radio telescope: an overview
P.-S. Kildal,L. Baker,T. Hagfors +2 more
TL;DR: In this article, the authors present an overview of the work that led to this design and the basic ideas behind the design are described, and the methods and algorithms that have been developed to synthesize the shapes of the two reflectors and to analyze them are reviewed.
Journal ArticleDOI
Diffraction analysis of a proposed dual‐reflector feed for the spherical reflector antenna of the Arecibo Observatory
TL;DR: In this paper, a dual-reflector feed for the spherical reflector antenna in Arecibo is presented, which is analyzed over a large frequency range: at the lower frequencies by physical optics (PO) integration, and at the higher ones by a geometrical optic (GO) ray tracing technique described in another work.
Journal ArticleDOI
Offset spherical dual-reflector antenna
TL;DR: The dual offset spherical reflector antenna as discussed by the authors offers the advantage of a circularly symmetric main reflector together with a subreflector possessing an axis of symmetry, which could lead to significant cost reductions in manufacture compared to existing offset designs.