skrf.media.freespace.Freespace.ep

property Freespace.ep: Number | Sequence[Number] | ndarray

Complex dielectric permittivity.

If \(\tan\delta_e\) is not defined:

\[\varepsilon = \varepsilon_0 \varepsilon_r\]

otherwise,

\[\varepsilon = \varepsilon_0 \Re[\varepsilon_r] (1 - j\tan\delta_e)\]

where \(\tan\delta_e\) is the electric loss tangent.

Returns:

ep – Complex dielectric permittivity in F/m.

Return type:

number or array-like