Analysis of the near and far fields of an offset paraboloid illuminating a rotatable flat passive reflector

In this paper an analysis of the near- or far-field patterns of an offset paraboloid (fed at its focus) illuminating a rotatable flat reflector for scanning the main beam of the offset reflector is presented. This analysis is based on the near-field GTD analysis developed earlier and the known techniques for transforming near fields to far fields. Computed results on the far-field patterns of a typical offset paraboloid illuminating a flat reflector are presented. Further, the computed results on the far-field patterns of a typical paraboloid illuminating a square flat reflector satisfactorily correlate with the available measured results.