Discussion
What is meant by shaping a dual reflector system?
Answer: B
Shaping alters both surfaces slightly from the ideal hyperboloid and paraboloid so that the power is redistributed more evenly across the aperture while the phase stays flat. Aperture efficiencies above seventy per cent become possible because taper loss is nearly eliminated without increasing spillover. Edge cutting shapes the beam contour, dielectric layers are not used this way, and focal length adjustment is ordinary design rather than shaping. It is the clearest example of solving an illumination problem with geometry rather than with the feed.
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