Phase difference between MOM and FEM solution

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello,
I have to characterize a dielectric material. I need to calculate the scattering parameters of the rectangular waveguide with inside it the dielectric to be characterized.
Resolving both with the MOM and then subsequently with the FEM I have a correspondence on everything, except on the S21 phase.
Who can tell me why?
Thank you.

<?xml version="1.0" encoding="UTF-8"?>S21_PHASE_MOM_E_FEM_FINE.png

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Answers

  • Mel
    Mel Altair Community Member
    edited March 2019

    Hi John1989

     

    The reference direction for the ports are different. This causes the 180 degree phase shift.

    You can change it for the MoM port as shown.

    ref_dir.png

    For the FEM port, it cannot be set, and is assigned automatically internally.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2019

    Thank you so much mel.

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