skrf.media.rectangularWaveguide.RectangularWaveguide.alpha_c¶
- property RectangularWaveguide.alpha_c: Union[Number, Sequence[Number], ndarray]¶
Loss due to finite conductivity and roughness of sidewalls.
In units of np/m See property rho for setting conductivity.
Effects of finite conductivity are taken from 1. If
roughness
is not None, then its effects the conductivity by\[\sigma_c = \frac{\sigma}{k_w^2}\]where
\[ \begin{align}\begin{aligned}k_w = 1 + e^{(-\delta/2h)^{1.6}}\\\delta = \mbox{skin depth}\\h = \mbox{surface roughness }\end{aligned}\end{align} \]This is taken from Ansoft HFSS help documents.
References
- 1
Chapter 9, (eq 9.8.1) of Electromagnetic Waves and Antennas by Sophocles J. Orfanidis http://eceweb1.rutgers.edu/~orfanidi/ewa/