Discussion
Why is a mesh sometimes used instead of a solid reflector surface?
Answer: D
Provided the mesh openings are small compared with the wavelength, the surface reflects almost as well as solid metal while weighing far less and passing the wind, which matters greatly on large steerable structures. The upper frequency limit is set by the mesh size. It does not add polarisation capability or bandwidth, and while it sheds water it does not prevent icing. Knowing when a structure may be approximated as a continuous surface is a recurring judgement in this subject.
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