Discussion
Why is an offset fed reflector often preferred over a prime focus one?
Answer: C
Moving the feed out of the beam path removes blockage and strut scattering, raising efficiency and lowering side lobes, which is why domestic satellite dishes are almost all offset. The price is a more complicated surface to manufacture and a cross polarisation penalty that must be managed. It is not cheaper, does not generate circular polarisation on its own, and bandwidth is set by the feed rather than by the geometry.
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