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  3. Why do I get the following error in HFSS Transient when using waveports: “Port refinement, process hf3d error: Port ‘1’ contacts more than one non-conducting material which violates the TEM terminal modes restriction” ?

Why do I get the following error in HFSS Transient when using waveports: “Port refinement, process hf3d error: Port ‘1’ contacts more than one non-conducting material which violates the TEM terminal modes restriction” ?

Tagged: 17.2, Electromagnetics & Electronics, excitations, hfss, Wave Port
    • February 6, 2023 at 2:42 pm
      FAQFAQ
      Participant

      Currently, the transient solver doesn’t support non-TEM mode ports. So TE & TM port modes for waveguides for example won’t work, and neither will quasi-TEM port modes for structures like microstrip lines and coplanar waveguides. Only TEM are supported. A workaround for microstrip and coplanar waveguide structures would be to use a lumped port between the signal conductor and ground. Do this, instead of using a waveport, whose geometry would extend to the air above the microstrip line (and touching multiple conductors), thus supporting quasi-TEM port modes. The lumped port will support purely TEM modes, thus getting rid of this error.

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