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Stripline Coupled Line Model Using AWR

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RookieTadehEERF

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Hi all,

I am having issues assigning correct substrate for my stripline lines in Microwave Office. For context, this is my stackup:

GND(copper)
Substrate 1
Traces(copper)
Substrate 2
GND(copper)

As marked in red in the image attached, the 7 coupled line stripline model is happy with SSUBL, but my striplines are not. I know I can use a balanced stripline substrate model to bypass this, but obviously my results will be vastly different than reality, as my stripline substrates are not balanced in height. Does anyone have any suggestions to work around this problem?

All answers are much appreciated,
 

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