skrf.media.circularWaveguide.CircularWaveguide.f_cutoff
- property CircularWaveguide.f_cutoff: Number | Sequence[Number] | ndarray
cutoff frequency for this mode
\[f_c = \frac{v}{2 \pi} \frac{u_{mn}}{R}\]where R is the radius of the waveguide, and u_mn is:
the n-th root of the m-th Bessel function for ‘tm’ mode
the n-th root of the Derivative of the m-th Bessel function for ‘te’ mode.
and v= 1/sqrt(ep*mu) is the bulk velocity inside the filling material.