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ADS simulation doubt ampr

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dili Neo

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in ads schematic I placed an amplifier and imported S parameter(from an .s2p file) to the amplifier and did S-parameter simulation after doing 50 ohm terminations.I got S21 as in data sheet.Then I placed an amplifier in schematic and imported s parameter(from an .s2p file) and placed a 50 ohm as load and and connected P_1 tone source and did ac simulation in same freq range and plotted 20*log(mag(vout/vin)).But it is different from S21 plot in data sheet.why is it so??How can measure gain in such a set up?

vout:eek:/p voltage of ampr
vin:i/p voltage of ampr

thanks in advance
 

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