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Coupled microstrip lines simulation in ADS

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viperpaki007

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Hi,

I am trying to do simulation of two coupled differential microstrip line pairs in ADS. I used model ML4CTL for variable width coupled microstrip lines. However, I am getting really strange results. For example having S21 of -6000dB. Schematic and results are attached. Can any body help.

 

Wrong substrate definition, take e.g. MLSUBSTRATE2 from Tlines-Multilayer library.
 
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