Discussion
What is aperture blockage?
Answer: D
In a prime focus or Cassegrain geometry the feed, subreflector and struts sit in the path of the reflected wave, removing power from the aperture and scattering it into the side lobes. The loss goes roughly as the square of the blocked fraction of the diameter, and the side lobe damage is often the more serious. Offset geometries avoid it entirely. Far field obstacles are a propagation problem, and deliberate masking is a synthesis technique of quite another kind.
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