Substrate Relative dielectric constant (εr)

Hi,

Can anyone help me on this, cos i will be using Felt & Fleece fabric as substrate but i couldn't find the relative dielectric constant (εr) & thickness of the material. Does anyone know where can i find those specs?
TQ

josh

There is quite a list here: Dielectric Constants of various materials

You need to know what the felt or fabric is made of, e.g. cotton, polyester etc. Even then, air gaps will cause errors.

Keith.

Hi Keith,

TQ for the information, i will checked it out for fabric material.