Question

a dielectric material has relative permittivity 18 and loss tangent 10^-3 at 100 MHz find the conductivity of the medium

Answer 1

$\sigma=w \epsilon_r\epsilon_0tan\phi$

$f=10^8hz\\\epsilon_r=18$

Put value

$$\sigma=2\pi\times10^8\times18\times8.85\times10^{-12}\times10^{-3}=1.0\times10^{-4} mho /m$$