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An analysis of the radiation from apertures in curved surfaces by the geometrical theory of diffractionIn this paper the geometrical theory of diffraction is extended to treat the radiation from apertures of slots in convex perfectly conducting surfaces. It is assumed that the tangential electric field in the aperture is known so that an equivalent infinitesimal source can be defined at each point in the aperture. Surface rays emanate from this source which is a caustic of the ray system. A launching coefficient is introduced to describe the excitation of the surface ray modes. If the field radiated from the surface is desired, the ordinary diffraction coefficients are used to determine the field of the rays shed tangentially from the surface rays. The field of the surface ray modes is not the field on the surface; hence if the mutual coupling between slots is of interest, a second coefficient related to the launching coefficient must be employed. In the region adjacent to the shadow boundary, the component of the field directly radiated from the source is represented by Fock-type functions. In the illuminated region the incident radiation from the source (this does not include the diffracted field components) is treated by geometrical optics. This extension of the geometrical theory of diffraction is applied to calculate the radiation from slots on elliptic cylinders, spheres, and spheroids.
Document ID
19750029380
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pathak, P. H.
Kouyoumjian, R. G.
(Ohio State University Columbus, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
November 1, 1974
Publication Information
Publication: IEEE
Subject Category
Communications And Radar
Accession Number
75A13452
Funding Number(s)
CONTRACT_GRANT: NGR-36-008-144
Distribution Limits
Public
Copyright
Other

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