Home Forums Bug Reports Transient analysis of lossy transmission line

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  • #2897
    bastardobastardo
    Participant

      In the TRA simulation of an ideal lossy line, the loss seems to be miscalculated. If one puts A = 1dB/m and makes a 1-m-long transmission line, the amplitude of a rectangular pulse at the end of line is reduced only by 0.5 dB with respect to incident voltage pulse at the beginning of the line, instead of 1 dB. The same goes for losses of A = 20 dB/m, where the pulse demonstrates only 10 dB loss on 1m line instead of 20 dB.

      The AC analysis works fine though. Losses of sine signals in exactly the same transmission line follow the theory.

      #2899
      bastardobastardo
      Participant

        Just to add this. The same problem appears with 3.3.2 and 4.2.2.

        #2902
        QucsStudioQucsStudio
        Keymaster

          Yes, you’re right! Many thanks for reporting this bug.

          It will be fixed in the next version.

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