Journal ArticleDOI
Diffraction by an arbitrary subreflector: GTD solution
Shung-Wu Lee,P. Cramer,K. Woo,Yahya Rahmat-Samii +3 more
- Vol. 27, Iss: 3, pp 305-316
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TLDR
Rahmat-Samii, Mittra, and Galindo-Israel as discussed by the authors studied the high-frequency asymptotic solution of diffraction by a conducting subreflector using Keller's geometrical theory.Abstract:
The high-frequency asymptotic solution of diffraction by a conducting subreflector is studied. By using Keller's geometrical theory of diffraction and the newly developed uniform asymptotic theory of diffraction, the scattered field is determined up to an including terms of order k^{-1/2} relative to the incident field. The key feature of the present work is that the surface of the subreflector is completely arbitrary. In fact, it is only necessary to specify the surface at a set of discrete points over a random net. Our computer program will fit those points by cubic spline functions and calculate the necessary geometrical parameters of the subreflector. In a companion paper by Y. Rahmat-Samii, R. Mittra, and V. Galindo-Israel, the scattered field from the submflector is used to calculate the secondary pattern of an arbitrarily shaped reflector by a series expansion method. Thus, in these two papers, it is hoped that we have developed a "universal" computer program that can analyze most dual-reflector antennas currently conceivable. It should also be added that our method of calculation is extremely numerically efficient. In many cases, it is one order of magnitude faster than the conventional integration method based on physical optics.read more
Citations
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Journal ArticleDOI
Shooting and bouncing rays: calculating the RCS of an arbitrarily shaped cavity
Hao Ling,R.-C. Chou,Shung-Wu Lee +2 more
TL;DR: In this article, a ray-shooting approach is presented for calculating the interior radar cross section (RCS) from a partially open cavity, where a dense grid of rays is launched into the cavity through the opening.
Book ChapterDOI
Techniques for High-Frequency Problems
TL;DR: In this article, the authors employ approximations based on high-frequency techniques for performing an efficient analysis of electromagnetic radiating systems that are large in terms of the wavelength, which is not the case for most of the existing techniques.
Shaped reflector antenna analysis using the Jacobi-Bessel series. [design for space and satellite communication]
TL;DR: In this article, the authors derived the radiation integral for a doubly curved offset reflector antenna illuminated by an arbitrary source using the Jacobi-Bessel series to evaluate the Fourier transforms.
Journal ArticleDOI
Shaped reflector antenna analysis using the Jacobi-Bessel series
TL;DR: In this paper, the authors derived the radiation integral for a doubly curved offset reflector antenna illuminated by an arbitrary source using the Jacobi-Bessel series to evaluate the Fourier transforms.
Journal ArticleDOI
Stationary phase method application for the analysis of radiation of complex 3-D conducting structures
TL;DR: In this article, the stationary phase method is used to calculate the radiation pattern of antennas on complex structures, which is stated directly over the parametric surfaces used to model the geometry and no translation of geometrical formats is required.
References
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Journal ArticleDOI
Geometrical Theory of Diffraction
TL;DR: The mathematical justification of the theory on the basis of electromagnetic theory is described, and the applicability of this theory, or a modification of it, to other branches of physics is explained.
Journal ArticleDOI
A uniform geometrical theory of diffraction for an edge in a perfectly conducting surface
R.G. Kouyoumjian,P.H. Pathak +1 more
TL;DR: In this article, a compact dyadic diffraction coefficient for electromagnetic waves obliquely incident on a curved edse formed by perfectly conducting curved plane surfaces is obtained, which is based on Keller's method of the canonical problem, which in this case is the perfectly conducting wedge illuminated by cylindrical, conical, and spherical waves.
Journal ArticleDOI
A uniform asymptotic theory of electromagnetic diffraction by a curved wedge
Shung-Wu Lee,G. Deschamps +1 more
TL;DR: In this paper, the diffracted field according to Keller's geometrical theory of diffraction (GTD) can be expressed in a particularly simple form by making use of rotations of the incident and reflected fields about the edge.
Journal ArticleDOI
Uniform Asymptotic Theory of Diffraction by a Plane Screen
Book
Analysis of reflector antennas
P. D. Patter,W. V. T. Rusch +1 more
TL;DR: In this paper, the authors present an analysis of reflector antennas covering electromagnetic field equations, computer aided design, and computer-aided design of reflectors for reflector antenna arrays.