Journal ArticleDOI
Conical-reflector antennas
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TLDR
In this article, the conical-Gregorian antenna was used to investigate diffraction and other effects, and to analytically confirm the high performance of the antenna, which was concluded that conical antennas are a valuable addition to available antenna design concepts.Abstract:
The mechanical advantages of a singly curved conical reflector are demonstrated by the experimental test of a furlable 1.83 m conical-Gregorian antenna at 16.33 GHz. The measured gain of 47.5 dB corresponds to a net efficiency of over 57 percent. A ray-optics analysis of conical-reflector antennas is presented, and data useful in the design of conical antennas is given. The conical-Gregorian antenna, in which a subreflector is used in conjunction with a conventional horn feed, is considered in detail. A physical-optics analysis of the conical-Gregorian antenna is used to investigate diffraction and other effects, and to analytically confirm the high performance of the antenna. It is concluded that conical antennas are a valuable addition to available antenna-design concepts.read more
Citations
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Proceedings ArticleDOI
A dual reflector antenna for omnidirectional coverage
Mario Orefice,Paola Pirinoli +1 more
TL;DR: In this paper, a new type of omnidirectional antenna is presented, consisting of a parabolic reflector and a conical reflector, arranged to radiate, with a proper choice of the feed, vertical polarization in the horizontal plane.
Journal ArticleDOI
Parabolic cylindrical surfaces employed as line sources and their use for illuminating conical reflectors
M. S. A. Sanad,Lotfollah Shafai +1 more
TL;DR: The properties of line sources simulated by a parabolic cylindrical surface utilizing a point source and the effects of various design parameters on its radiation patterns are investigated and presented.
Proceedings ArticleDOI
Focal region field of conical reflectors
TL;DR: In this article, the performance of these reflectors with a line source and Gregorian sub-reflector was studied, where aperture efficiences in order of 6Cl percent were achieved.
Proceedings ArticleDOI
Conical reflector antennas having very low cross-polarization levels
TL;DR: In this paper, two identical sets of that simulated line source are simultaneously used to illuminate both sides of the cone and the radiation pattern of the antenna is calculated using the extended aperture integration method, where both reflected and diffracted rays are included.
Analysis of a dual-reflector antenna system using physical optics and digital computers
TL;DR: In this paper, the application of physical-optics diffraction theory to a deployable dual-reflector geometry is discussed, and the methods employed are not restricted to the Conical-Gregorian antenna, but apply in a general way to dual and even multiple reflector systems.
References
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Journal ArticleDOI
Near-field far-field transformations using spherical-wave expansions
TL;DR: In this article, the authors used spherical-wave expansions as a numerical technique for expressing arbitrary fields specified by analytical, experimental, or numerical data, and found that the generally accepted wave order cutoff value corresponds to 99.9 percent or more of the power in the input pattern.
Journal ArticleDOI
A Gregorian corrector for spherical reflectors
TL;DR: In this paper, the inherent spherical aberration of a spherical reflector antenna is corrected by using an auxiliary Gregorian reflector feed system that rotates about the center of curvature of the reflector.
A new geometry for unfurlable antennas
TL;DR: Unfurlable spacecraft antenna design and electrical characteristics, using Gregorian geometry with conical main and parabolic subreflector, were described in this paper, where the authors used the parabolic reflector as an antenna.