skrf.media.coaxial.Coaxial.from_attenuation_VF¶
- classmethod Coaxial.from_attenuation_VF(frequency=None, z0=None, Z0=50, att=0, unit='dB/m', VF=1)[source]¶
Init from electrical properties of the line: attenuation and velocity factor.
Attenuation can be expressed in dB/m, dB/100m, dB/ft, dB/100ft, Neper/m or Neper/ft. Default unit is dB/m. A different unit is set by the unit parameter.
- Parameters
frequency (
Frequencyobject) –z0 (number, array-like, or None) – the port impedance for media. Only needed if its different from the characteristic impedance of the transmission line. if z0 is None then will default to Z0
Z0 (number) – desired characteristic impedance
att (number, or array-like. optional) – Attenuation of the coaxial line. The default is 0. If passed as an array, should be of same size than the frequency.
unit (string, optional) – Unit of the attenuation. Can be: ‘dB/m’, dB/100m’’, ‘dB/ft’, ‘dB/100ft’, ‘Neper/m’ or ‘Neper/ft’ (or ‘Np/m’, ‘Np/ft’). The default is ‘dB/m’.
VF (number, or array-like. optional) – Velocity Factor VF [VF]. The default is 1. If passed as an array, should be of same size than the frequency.
- Returns
media
- Return type
References