HFSS SMA model and CAP..?

Hello!

Can anybody explain the meaning of "cap" in the HFSS SMA model on p.16 and p.23? For what is it?

Tnx

The PEC cap is a standard way of how to use the waveport on coaxial line when the port is inside the airbox and not on the edge (as microstrip for example). You make a waveport on the PEC-cap face touching your coax line.