Journal ArticleDOI
Synthesis of offset dual shaped subreflector antennas for control of Cassegrain aperture distributions
V. Galindo-Israel,Raj Mittra +1 more
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TLDR
In this paper, an offset dual-shaped subreflector (DSS) antenna is proposed to achieve a controllable high gain amplitude distribution in the aperture of a large paraboloid.Abstract:
Many existing large ground reflector antennas have been designed as Cassegrain systems-i.e., paraboloid/hyperboloid combinations. Other large ground antennas are simply paraboloid designs. Upgrading the gain of these systems to a gain comparable to that obtainable with a dual shaped reflector antenna system has been an important and costly objective of many such ground stations. A potentially economic method for such an antenna upgrade is presented herein. It involves a redesign of only the subreflector portion of a Cassegrain antenna or the introduction of a subreflector feed system for a parabaloid. A pair of offset subreflectors are synthesized which will give a controllable high gain amplitude distribution in the aperture of the large paraboloid. The synthesis method that is used is based on an approximate formulation for an offset dual shaped high gain antenna that was first presented by Galindo-Israel and Mittra in 1977. In that approximate formulation, the geometrical optics (GO) energy was scattered from a subreflector and then from a second large reflector which reflected a uniform phase distribution. In the present offset dual shaped subreflector (DSS) antenna, the second reflection is from a smaller (sub) reflector and it scatters a spherical wave that feeds a hyperboloid or feeds a large paraboloid directly. Excellent results are shown for the approximate synthesis of the DSS.read more
Citations
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Journal ArticleDOI
A new accurate design method for millimeter-wave homogeneous dielectric substrate lens antennas of arbitrary shape
TL;DR: In this paper, the synthesis and optimization of 3D lens antennas at millimeter-mm-wave frequencies was studied theoretically and experimentally at millimeters-wave frequency. But the authors only considered the inverse scattering problem, which transforms the radiation pattern of the primary feed into a desired amplitude-shaped output pattern.
Journal ArticleDOI
On the theory of the synthesis of single and dual offset shaped reflector antennas
TL;DR: In this paper, it was shown that an exact solution for offset dual-or single-shaped synthesis exists, and that an infinite set of such solutions exists, in part from numerical results.
Journal ArticleDOI
Gaussian mode analysis of Cassegrain antenna efficiency
TL;DR: In this article, the authors used multimode Gaussian optics to derive several interesting results concerning the aperture efficiencies of Cassegrain antennas fed by corrugated conical horns, and generalize these results to show that a true image of the aperture distribution can always be formed on the spherical cap in the aperture of any arbitrary scalar horn, by using a single refocusing tertiary lens or mirror.
Journal ArticleDOI
Scalar horn with shaped lens improves Cassegrain efficiency
Per-Simon Kildal,K. Jakobsen +1 more
TL;DR: In this article, it is shown that the aperture efficiency of a classical Cassegrain antenna can be improved if the radiation pattern of the feed is optimally shaped, and the corresponding optimum field distribution over the aperture consists of a circular main lobe which is surrounded by concentric sidelobe rings.
Journal ArticleDOI
Offset dual-shaped reflectors for dual chamber compact ranges
TL;DR: In this paper, the application of the theory of the synthesis of offset dual-shaped reflectors to the design of compact ranges is examined. But the authors do not consider the effect of the reflector aperture distribution.
References
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Journal ArticleDOI
Design of dual-reflector antennas with arbitrary phase and amplitude distributions
TL;DR: In this paper, a generalization of the optical design is presented which allows the synthesis of reflector shapes for arbitrary phase and amplitude distributions in the aperture of the larger reflector with an arbitrary primary feed.
Journal ArticleDOI
Microwave antennas derived from the cassegrain telescope
TL;DR: In this paper, the fundamental performance of a Cassegrain double-reflector system was analyzed by means of the equivalent-parabola single reflector concept, and a set of polarization-operative surfaces was developed for these twisting antennas.
Journal ArticleDOI
Aperture amplitude and phase control of offset dual reflectors
TL;DR: The dual-shaped reflector synthesis problem was first solved by Galindo and Kinber in the early 1950's for the circularly symmetric shaped reflectors as mentioned in this paper, and it was shown that the surfaces required to transform this feed pattern by geometrical optics into any specified phase and amplitude pattern in the specified output aperture are found by the integration of two simultaneous nonlinear ordinary differential equations.