Discussion
What does absorber placed around a patch under test achieve?
Answer: D
Absorber at the board edge attenuates the surface and creeping waves before they can diffract, so the measured pattern is closer to that of an infinite ground plane. It costs a little gain rather than adding any. Chamber wall reflections are dealt with by absorber on the walls, and thermal management is not a pattern measurement concern. Treating the antenna's own structure as a source of unwanted radiation, and absorbing it, is a standard measurement technique.
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