Abstract
Imaging with Fresnel diffraction taken into account is applied to the design of a broadband narrow pattern feed. This feed is not only a basic building block of an imaging beam waveguide, but also essential for an offset reflector antenna of large effective F/D ratio. Furthermore, it can be used as a constant beamwidth radiometer antenna for multifrequency remote sensing. We have built and tested a practical example that consists of an offset ellipsoidal reflector and a corrugated horn. Measured amplitude and phase patterns agree with calculated results, which include truncation effects. Systematic design procedures are obtained for a given feed horn and the required reflector illumination. Necessary and sufficient conditions of the thin lens model are translated into design parameters of an offset ellipsoidal reflector with projected circular aperture. Geometrical relations of the offset ellipsoid and calculations of radiation patterns are described in the appendices.
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