| Definition: | a paraboloidal reflector antenna with a concave sub-reflector ellipsoidal in shape, located at a distance from the vertex of the main reflector, that distance being greater than the prime focal length of the main reflector
NOTE – To improve the aperture efficiency of the antenna, the shapes of the main reflector and sub-reflector are sometimes modified with respect to the ideal paraboloidal and ellipsoidal geometrical forms.
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