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SAC or FAR: what is the difference?
Semi-anechoic and fully anechoic chambers look alike from outside. Inside they differ in three ways.
Published by TESTUPS · 2023-02-25
1. The floor
A SAC keeps a reflective metal ground plane on the floor. A FAR covers the floor with ferrite tiles and/or absorber, depending on the frequency range.
2. The absorber
In a FAR every surface absorbs, so absorber performance across the whole frequency range matters even more. In a SAC the floor reflection is part of the method.
3. The dimensions
For the same measurement distance the rooms differ in size and shape, because the antenna height scan of a SAC needs room that a FAR does not.
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