Discussion
What does an anechoic chamber prevent?
Answer: D
The absorber lining attenuates any wave that strikes a surface, so the antenna sees essentially only the direct path from the source. Keeping external signals out is the job of the metal shell behind the absorber, personnel safety is handled by interlocks, and the positioner holds the antenna. Separating the two functions of a chamber, shielding by the metal and anechoic behaviour by the absorber, makes clear which part of the structure does what.
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