I am looking for the exact formulas for the impedance of an electric and magnetic wave in the near field region.
We have some approximates:
Zwe≈ 1 / (ω * ε0 *r)
Zwm≈ (ω * µ0 *r)
where r is the distance, ω is the angular frequency, ε0 vacuum permittivity, µ0 vacuum permeability
However these formulas are only approximations, and I believe the accurate formula involves complex numbers.
I could not find the full formula for this, I was hoping somebody here would know it.