numpy.ndarray, z0: Union[numbers.Number, Sequence[numbers.Number], numpy.ndarray] = 50, s_def: str = 'power') → numpy.ndarray[source]

convert scattering parameters [1] to admittance parameters [2]

Equations are the inverse of s2z().

  • s (complex array-like) – scattering parameters
  • z0 (complex array-like or number) – port impedances
  • s_def (str -> s_def : can be: 'power', 'pseudo' or 'traveling') – Scattering parameter definition : ‘power’ for power-waves definition [3], ‘pseudo’ for pseudo-waves definition [4]. ‘traveling’ corresponds to the initial implementation. Default is ‘power’.

y – admittance parameters

Return type:

complex array-like


[3]Kurokawa, Kaneyuki “Power waves and the scattering matrix”, IEEE Transactions on Microwave Theory and Techniques, vol.13, iss.2, pp. 194–202, March 1965.
[4]Marks, R. B. and Williams, D. F. “A general waveguide circuit theory”, Journal of Research of National Institute of Standard and Technology, vol.97, iss.5, pp. 533–562, 1992.