I am designing a structure containing patch antenna and some passive components where I have to place .s2p data of capacitors and lumped resistor from ADS "lumped components library".
I have got completely different result in infinite ground MoM (very good result) and finite ground MoM case (worst result). I might have done mistakes in case of finite ground MoM case. Near to patch, I have kept ground plane size 3 times of width and length of patch accordingly. I have also changed the port calibration from TML to AUTO in finite ground case, but the response is same.
Please see the following figures taken from Co-simulation (Yellow is bottom finite ground and orange is the top metal). In all cases, ground pin is 0.1mm away from the + pin. The design frequency is 10 GHz.
^^ Lumped resistor
^^ s2p componets
^^ Term component