I can't find any design issue in your post.
Your question is not design issue but simple usage of EDA tool.
Please post to
"The Designer's Guide Community Forum ≫ Simulators ≫ RF Simulators".
Or
Agilent Home >Products & Services > Test & Measurement >
Agilent EEsof EDA > EEsof Knowledge Center > Discussion Forums
Agilent EEsof Forums > ADS > Analog Simulation
https://edasupportweb.soco.agilent.com/cgi-bin/yabb/YaBB.pl This is packaged BJT model.
AT41486 have 4 pins(c, b, e, e).
You open one emitter pin.
Try connect two emitter pins.
And why don't you set C1 as 10pF//100pF.
I've found your mistake.
You've set wrong port number.
You shouls set num=1 for input port.
And set num=2 for output port.