The structure of RAM in a RF anechoic chamber

Hi, I am wondering why is radiation absorbtion material (RAM) has a pyramid structure in a RF anechoic chamber? Why not cube or some other
pattern?
A.M.
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snipped-for-privacy@gmail.com wrote:

google "impedance matching pyramid anechoic"
-- Adrian C
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It minimizes reflections from RF sources within the chamber.
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