Journal ArticleDOI
Elimination of infinities in equivalent edge currents, part I: Fringe current components
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In this paper, the fringe current components of the equivalent edge currents are derived for all aspects of illumination and observation, except for the special case where the direction of observation is the continuation of a glancing incident ray propagating "inwards" with respect to the wedge surface (the Ufimtsev singularity).Abstract:
New expressions are derived for the fringe current components of the equivalent edge currents. They are obtained by asymptotic endpoint evaluation of the fringe current radiation integral over the "ray coordinate" measured along the diffracted ray grazing the surface of the local wedge. The resulting expressions, unlike the previous ones, are finite for all aspects of illumination and observation, except for the special case where the direction of observation is the continuation of a glancing incident ray propagating "inwards" with respect to the wedge surface (the Ufimtsev singularity).read more
Citations
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Journal ArticleDOI
A generalized diffraction synthesis technique for high performance reflector antennas
Dah-Weih Duan,Yahya Rahmat-Samii +1 more
TL;DR: In this article, a generalized diffraction synthesis technique for single and dual-reflector antennas fed by either a single feed or an array feed is presented, which combines optimization procedures and diffraction analysis such as physical optics (PO) and physical theory of diffraction (PTD).
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Ray tracing with PO/PTD for RCS modeling of large complex objects
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Journal ArticleDOI
Elementary Edge Waves and the Physical Theory of Diffraction
TL;DR: In this paper, a more general and rigorous form of the physical theory of diffraction (PTD) is presented, which is based on the conception of elementary edge waves (EEWs), the waves scattered by the vicinity of an edge infinitesimal element.
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High frequency techniques for antenna analysis
TL;DR: A summary of various high-frequency techniques for analyzing the electromagnetic radiation from antennas in the presence of their host environment is presented in this paper, where numerical results are compared with those based on other independent methods or with measurements.
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Bidirectional Analytic Ray Tracing for Fast Computation of Composite Scattering From Electric-Large Target Over a Randomly Rough Surface
Feng Xu,Ya-Qiu Jin +1 more
TL;DR: In this article, a bidirectional analytic ray tracing (BART) method is developed to rapidly calculate composite scattering from three-dimensional (3D) electrically large complex targets above a randomly rough surface.
References
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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
Diffraction by an Aperture
TL;DR: In this paper, the geometrical theory of diffraction was introduced to account for diffraction by introducing new rays called diffracted rays, which are produced when incident rays hit the aperture edge.
Journal ArticleDOI
Equivalent edge currents for arbitrary aspects of observation
TL;DR: In this article, the authors derived explicit expressions for equivalent edge currents for an arbitrary local wedge angle and arbitrary directions of illumination and observation, based on an asymptotic relationship between the surface radiation integral of the physical theory of diffraction and the line radiation integral.
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
Evaluation of edge-diffracted fields including equivalent currents for the caustic regions
C. Ryan,Leon Peters +1 more
TL;DR: In this paper, the authors used the geometrical theory of diffraction to obtain the backscattered field for plane-wave incidence on a target with particular emphasis on those regions that are usually avoided, namely, the caustic region and its immediate vicinity.