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sector, since it is shielded by the walls of the horn in other directions. A knowledge of the GTD reveals that the radius of curvature of an edge has a significant influence on the magnitude and behavior of the diffracted fields from the edge. The spreading factor (A) depends upon the edge caustic ( p ) , which is given by [5] where p: is the radius of curvature of the incident wavefront in the edge fixed plane of incidence, a, is the radius of curvature of the edge at the point of diffraction, and 8, is the angle between the incident ray and the edge. The unit vectors field of such a cell consists of a high-field region and a uniform field region, useful in many applicarions. ABSTRACT The field distribution of a new type of TEM cell with a cross of unequal-length arms as the inner conductor is given here. The whole

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Absfracf-This paper introduces a method for calculating the total antenna pattern in the E plane, including the backlobe region, of a horn by applying diffraction theory. Treatment of diffraction by a thick edge permits horns of various edge thicknesses to be treated. 1 Keller, J. B., Diffraction by an aperture, J. Appl. Pltys., vol Keller, J. B., Geometrical theory of diffraction, J. Opt. SOC. Am., diffraction of light, Phys. Rev., ~0 1 5 4 , Dec 1938, pp 924-931.