Discussion
What limits the low frequency performance of an anechoic chamber?
Answer: C
Absorber works by grading the impedance over a distance, so at long wavelengths the pyramids are electrically short and reflect much more. Ferrite tiles are added for the lowest frequencies because they absorb in a thin layer. Metal shielding improves rather than worsens at low frequency, chamber size is a separate constraint that also matters, and positioning accuracy is unaffected. A treatment whose thickness is fixed always has a lowest frequency at which it still works.
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