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.