#90 Hybrid coupler S-parameters faulty

0.0.17
closed-fixed
nobody
None
5
2013-06-20
2013-01-28
Gregor V
No

The S-parameters of the hybrid coupler seems to be broken as seen in the attached circuit.

As a test case, I attached a small circuit that should yield S21 = 1, but instead it is 2.83, which seems quite wrong in pure passive circuit ;-) The equivalent circuit with directional couplers and 90° phase-shift on the output generates the expected result.

Looking at qucs-core/src/components/hybrid.cpp shows that sqrt(2) is used as coefficient, which should obviously be 1/sqrt(2).

1 Attachments

Discussion

  • Frans

    Frans - 2013-05-28
    • status: open --> accepted
    • Group: --> v1.0_(example)
     
  • Frans

    Frans - 2013-05-28

    I can reproduce the bug. Looking into it.

     
  • Frans

    Frans - 2013-06-10

    It should work now. (0.0.17.130610)

     
  • Frans

    Frans - 2013-06-10
    • status: accepted --> closed-fixed
     

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