A Novel Matched Feed Structure for Achieving Wide Cross-polar Bandwidth for an Offset Parabolic Reflector Antenna System


This letter presents the details of a completely unique matched feed structure that promises improved cross-polar performance for an offset parabolic reflector antenna. Feed aperture fashioned by an intersection of circular and rectangular waveguides provides wide cross-polar bandwidth thanks to the cutoff wave numbers being shut for the 2 modes utilized in conjugate matching. The mode coefficients and relative part distinction are estimated using particle swarm optimization (PSO) technique for the required antenna system. Physical optics (PO) is employed to judge the reflector pattern; feed radiation pattern is obtained using mode field patterns and cutoff wave numbers, which are computed using a pair of-D finite component methodology (FEM). The upper order mode that is combined with the most operating mode of the waveguide for conjugate matching is generated using two posts placed behind the aperture. The antenna system performance is evaluated using HFSS and CST Microwave Studio.

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