.Modelica.Electrical.Analog.Lines.TLine

Information

Lossless transmission line with characteristic impedance Z0 and transmission delay TD. The lossless transmission line TLine is a two Port. Both port branches consist of a resistor with characteristic impedance Z0 and a controlled voltage source that takes into consideration the transmission delay TD. For further details see [Branin1967]. The model parameters can be derived from inductance and capacitance per length (L' resp. C'), i. e. Z0 = sqrt(L' / C').

There are three possibilities for specifying the transmission delay TD:

• Calculate TD = sqrt(L' * C')*length_of_line.
• Specify the normalized length NL, i.e. the length of the line divided by the wavelength corresponding to the frequency F: TD = NL / F.
• Specify NL = 1/4, i.e. the length of the line is assumed to be equal to a quarter of the wavelength corresponding to the frequency F: TD = 1/4 / F. In that case, the characteristic impedance Z0 is called natural impedance.

Resistance R' and conductance G' per meter are assumed to be zero.

References: [Branin1967], [Hoefer1985]

Revisions

• 1998 by Joachim Haase
  initially implemented