Elliptical and rectangular dielcore horns for reflector antenna applications

A novel class of dielectric-loaded feed horns, so-called dielcore horns, for generating elliptical radiation patterns is presented. The dielcore horns are used as feeds in an offset parabolic reflector with an elliptical aperture. Their characteristics are high feed efficiency for elliptical beams and high cross-polar isolation for dual-linear and for dual-circular polarization. Compared to corrugated rectangular or elliptical horns they have considerably larger cross-polar bandwidth and potentially lower production costs. The calculated feed patterns in the narrowest pattern planes of the open-ended waveguides are shown for both the fundamental orthogonal modes. Copolar and cross-polar patterns in the two major planes of an offset parabolic reflector with an elliptical projected aperture fed by a rectangular open-ended dielcore waveguide are also shown.<
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