CAD tools discrepancy at 77GHz!

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Shehata

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These days we are trying to design a band pass filter at 77GHz based on coplanar waveguide technology. Although filters are known by their systematic design approaches, we faced surprises as usual. The Schematic simulations for ADS are far different than the momentum one. Moreover, the full field solver HFSS give us completely different results!!
Any clue?
 

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