Discussion
What sets the highest usable frequency of a mesh reflector?
Answer: A
Once the openings become an appreciable fraction of a wavelength the mesh begins to leak and both gain and front to back ratio suffer, so a mesh good for one band is transparent at a higher one. A tenth of a wavelength is a common rule. Wire conductivity affects loss slightly, tension affects surface accuracy, and diameter sets the gain rather than the frequency limit. The criterion is always the size of a feature measured in wavelengths, which is the recurring theme of the whole subject.
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