Abstract
This paper presents analysis and design of a Gaussian backscatter antenna with ring focus feed. The curvature of main re∞ector is Gaussian, and the subre∞ector is a portion of an ellipse. The antenna has axial symmetry. A backscattering technique is used with the main re∞ector to achieve wide beamwidth. The input parameters of the proposed antenna are derived in closed form. Physical theory of difiraction (PTD) is used to analyze the radiation pattern of the proposed antenna and verifled with experimental results. The efiects of the support structures on the radiation patterns of the proposed antenna have been investigated experimentally. The proposed antenna can produces high gain and wide beamwidth (coverage angle µ = §65 - ). This antenna can be used for realizing earth coverage beam in LEO satellite or indoor wireless LAN applications.
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