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Ur antenna is a planar structure or a 3D cylindrical Loop..??
Its not impossible to simulate an Planar loop structure in ADS..!! Do u have any references that u r following for ur design rules..?? Making a Printed loop in ADS is quite easy..!!
"C tun" must be a loading capacitor i believe ??
Generally If the design involves any lumped elements, u have to go for co simulation.. Works for designs like Wilkinson power divider were u design it in momentum and put ports at the points u want the lumped element to be placed..!! Create a component of design and use the component in schematic..!!
U can try doing it for this antenna design but i'M not sure if it will take for account while computing the radiation pattern..!!
Once u r finished with ur design in layout, Go to
momentum -> component -> create/ update, u can create a component by following these steps,
Once done, take a schematic window and go to library, U can find project option on left side, Find the name with which u save the file with ur component, Drag it and drop it to ur schematic..!! Use the ports that u have put in layout to connect ur capacitor or any other element and simulate..!!
Do comment on how the results are coming in terms of radiation pattern..!!
Schematic does a circuit level equivalent analysis of a given structure and At layout u do Numerical techniques to evaluate the performance, as per the EM Model, Have a look at the link below,
http://edocs.soco.agilent.com/display/ads2011/Using+an+EM+Model