ADS schematic s-param simulation differce EM S-param simulation

Hello Haim, The S- parameter in the EM window gave me a very bad result , where as in the schematicstage i did get a good result .
if you could help me understand where did i go wrong why the S-parameter in EM windows gives such a bad result

Maybe post your schematic and EM-layout and your results, otherwise it's just guessing!

If possible attach your ADS project also.