Discussion
How does a shaped dual reflector raise aperture efficiency above seventy per cent?
Answer: C
Shaping both surfaces lets the illumination be made nearly uniform while the feed pattern still falls away at the rim, breaking the usual taper against spillover trade. That is why large earth station antennas are almost always shaped. Blockage remains and is dealt with by offset geometry, surface error is a manufacturing matter, and the feed size follows from the optics. Escaping a trade by changing the geometry rather than by choosing a point on it is the most satisfying kind of engineering answer.
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