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Asymptotic theory based on geometrical optics and physical optics is developed for 3D array-fed reflector antenna with an offset parabolic reflector. Relationships between parameters of the antenna structure and its performances are presented. Procedures of a feed array design and a cluster design are described. Radiation performances are simulated and discussed. Quality of the antenna with electrical beam steering is considered in terms of aperture efficiency and element use efficiency. Quality of the antenna with a contoured beam or multiple beams is proposed to describe in terms of coverage efficiency.

A method of antenna pattern reconstruction using sampling field data in sparse grid of points in Fresnel zone is presented. According to this method, antenna far field pattern in a desired section is reconstructed from several sections of the field in Fresnel region. Fresnel field to far field transformation is based on two-dimensional Fourier series expansion. Main features of the method are discussed. Computer simulation results are given.

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