TAGGED: ansys-hfss, driven-terminal, lumped-port, waveport
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September 14, 2024 at 12:08 pm
alexandre-antoi.bourrieau
SubscriberHello,
I am trying to simulate a 100 ohm differential impedance FCC flat cable (Molex) but I can't find consistent results when using the Lumped or Wave terminal ports.
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My aim is to simulate 24 inches long cable. But as it is very processor demanding, I want to simulate a portion of the cable (here 5 cm) and virtualy increase the lenght of the cable by de-embeding it.
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Problem is I cannot use lumped ports because using lumped port do not give the possibility to use de-embeding for extend lenght of cable. So I need to to use wave ports.
The structure of the cable is following and I am trying to simulate common signal to get 50 ohm impedance :
When using terminal Lumped port, I got 50 ohm result for a single signal with two GND around it (GND/ SIG / GND ) which is consistent with the 100 ohm diff cable :
Unfortunatly, when using terminal wave port, I got 38 ohms instead of 50 :
I have tried to modify a little the port geometry so that there is 3 digit scale for the E-field on the wave port, and a better e-filed vector distribution but I still get 38 ohm instead of 50 ohm...
Do someone have any idea to get better result using wave port ?
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Thanks you very much !
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September 14, 2024 at 5:08 pm
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September 27, 2024 at 3:00 pm
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October 15, 2024 at 12:23 pm
alexandre-antoi.bourrieau
SubscriberI got the same result, even by using "Maximum Delta z0" = 0.1% instead of 2%...
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