Discussion
Why are the edges of a compact range reflector rolled or serrated?
Answer: A
A sharp rim diffracts, and that diffracted field interferes with the collimated wave to produce ripples across the quiet zone, which would corrupt every measurement made in it. Rolling the edge away or serrating it spreads the diffraction harmlessly. Stiffness, assembly and spillover absorption are handled separately. Edge treatment appears wherever a finite aperture must produce a clean field, and the same reasoning applies to earth station rim shrouds.
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