# Building a personal RF anechoic chamber in a large walk-in closet?

What would one need (besides many foam absorbers) to build an in-home small anechoic chamber for transmissions in the UHF to L-bands (specifically 500Mhz - 2 Ghz), and what resources would you point them towards?

Also does anything specific need to be under the foam absorbers?

For example, if a closet is 'unfinished' and only consists of wooden boards and some insulation between each board, could the absorbers go right on, what do you suggest?

• What scattering parameters specs do you expect? There will always be standing waves unless you have a lot of big lossy tetrahedral absorbers in a big walking closet. – Tony Stewart Sunnyskyguy EE75 Nov 18 '19 at 3:20
• You also need to be aware of (and shield from) any incoming RF interference, so grounded metal covering on all external walls (under the loss absorbers) would be needed. – Nedd Nov 18 '19 at 3:25
• things to keep in mind: for 500MHz your chamber needs to be relatively big in order to properly measure far field, >$10\lambda$ (6m) is a good guideline; shielding may be essential if you're going to use the chamber for receiver characterization, for instance; the absorbers are not trivial: they usually have a charcoal treatment and need to be big enough to work at lower frequencies. – joribama Nov 18 '19 at 4:05
• This smacks of nonsense pseudo-science and no microwave understanding at all – Tony Stewart Sunnyskyguy EE75 Dec 16 '19 at 0:07