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Fast and accurate numerical modeling of a TARA-like shielded paraboloidal reflector antenna

A problem of time-harmonic electromagnetic wave diffraction by a perfectly electrically conducting (PEC) finite surface of rotation located in a free space is investigated. The problem is split to independent azimuthal orders and reduced to sets of hypersingular and singular integral equations. These equations are solved numerically by the method of discrete singularities (Nystrom method), using interpolation type quadrature formulas. From the solutions of these sets the surface-current components, near field and the far — zone scattering patterns are obtained. The presented method has a guaranteed convergence for an arbitrary non-axially symmetric primary field. This method is applied to the analysis of a paraboloidal reflector antenna with a conical shield designed to reduce the side radiation.