[Qucs-help] waveguide ports

[walter <st...@ti...>]

Hi

Using qucs I would like to performe the analysis of a passive spice circuit=
=20
(containing L R and G elements) having some ports terminated on the=20
characteristic impedance of a wave-guide.
It is well known that the  characteristic impedance Zc depends on the=20
frequency  as given below:

  Zc_TE =3Dsqrt(mu/epsilon)  f / sqrt(f^2-fc^2)=20
  Zc_TM =3Dsqrt(mu/epsilon) sqrt(f^2-fc^2) / f       =20
  where   f=3Dfrequency
               fc=3Dcutoff frequency for the particular w.g. mode (TE or TM)

=46or f>fc (where Zc is real) I would like to have a scattering matrix that=
 is=20
normalized with respect to Zc (as usual for a waveguide component).

May you please give me some hints.

Tanks in advance
Walter Steff=E8