# What Is The Difference Between These Dielectric Terms?

by FredericChopin
Tags: dielectric, difference, terms
 P: 57 Also, does anyone know the derivation to the equation: $$\alpha = \frac{2 \pi }{ \lambda } \sqrt[]{ \frac{ \varepsilon_r \sqrt[]{1 + tan^{2} \delta } - 1}{2} }$$ , which is also on the website? Thank you.