Journal ArticleDOI
GTD analysis of near-field and far-field patterns of a parabolic subreflector illuminated by a plane wave
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A geometrical theory of diffraction (GTD) analysis of the principal plane far-field and near-field patterns of a Cassegrainian subreflector is presented in this article.Abstract:
A geometrical theory of diffraction (GTD) analysis of the principal plane far-field and near-field patterns of a near-field Cassegrainian subreflector is presented. The uniform geometrical theory of diffraction (UGTD) [1] that drastically reduces the computation time has been utilized to analyze the subreflector in the form of a paraboloid illuminated by a plane wave. The numerical computations of the far-field amplitude and phase patterns of a typical paraboloidal subreflector based on the above technique correlate well with the results obtained by physical optics current integration, justifying the validity of the analysis presented. The GTD near-field analysis presented here is an improvement over that published earlier [2] and removes some of its limitations.read more
Citations
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Analysis of subreflectors for dual reflector antennas
N.C. Albertsen,K. Pontoppidan +1 more
TL;DR: In this paper, various methods for the calculation of the field reflected from a subreflector in a dual reflector antenna system were presented, and it was demonstrated that the physical-optics (PO) solution agrees well with the geometrical theory of diffraction for the copolar component.
Journal ArticleDOI
Radar-invisibility on axis of rotationally symmetric reflectors
TL;DR: In this paper, it has been observed that the monostatic radar cross section (RCS) of parabolic perfect electric conductor (PEC) reflectors vanishes at certain frequencies for broadside wave incidence.
Journal ArticleDOI
Analysis of Electrically Small Hyperbolic Subreflectors Utilizing the Geometrical Theory of Diffraction
TL;DR: In this paper, the results for 3 to 8 λ -diameter hyperboloidal subreflectors, using the geometrical theory of diffraction (GTD) are presented and compared with the physical optics approach and other data.
References
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Journal ArticleDOI
An experimental study of near-field cassegrainian antennas
D. C. Hogg,R. A. Semplak +1 more
TL;DR: In this paper, the near-field Cassegrainian antenna is a double-reflector system that employs, in its simplest form, confocal paraboloids, and experimental data on noise performance, gain, and radiation patterns have been obtained at a frequency of 6 gc using two 16-foot paraboloid (focal length-to-diameter ratios of 0.375 and 0.25) in both standard and near field configurations.
Journal ArticleDOI
GTD analysis of the near-field patterns of conical and corrugated conical horns
M. Narasimhan,K. Rao +1 more
TL;DR: In this paper, a novel technique for the analysis of the principal plane near-field patterns of conical and corrugated conical horns excited in the dominant mode based on the uniform geometrical theory of diffraction (UGTD) is presented.
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