foam layer characteristics reg

[Diana S]

can anyone please tell me the dielectric constant and loss tangent value of foam layer

 

[jiripolivka]

can anyone please tell me the dielectric constant and loss tangent value of foam layer

Nobody can. There are many foam materials with many features
Foam is used for the advantage that bubbles are filling the volume, with a minimum amount of material that can have a high permittivity and high loss.
To answer your question you must measure a particular material.

 

[biff44]

untreated foams are mostly air, so the dielectric constant is near 1. However, if they are loaded with something, like carbon, etc, all bets are off.