Discussion
What is a lens antenna?
Answer: C
A lens delays the central rays relative to the edge ones, or the reverse, so that a spherical wave from the feed emerges as a plane wave across the aperture. Dielectric lenses do it by refraction and metal plate lenses by the phase velocity in parallel plate guides. It has no blockage problem, since the feed is behind the aperture, but it is heavy and lossy. Reflectors, radomes and focused arrays are all different devices addressing different problems.
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