CPS Wave-Ports, Multi-mode or not

This is the first time I've done CPS in any simulation software. So I'm not sure on ports. I have a section of CPS transmission line with a wave-port on each side, thick substrate, and no ground plane. In HFSS do I want to have my wave-port surround both traces and use two port modes? If so do I have the integration line be in the opposite direction on only one mode of one of the ports? Or is there a better way to do it with the driven terminal solver?

Or do I want to have my wave-port centered on one of the traces and the outer edge of the wave-port touch the other trace? I assume the rules for CPS port dimensions are the same as CPS?


Thanks,
Bryan

Ok, some easier questions:

lamda_g = 597.2 um
h_substrate = ~500 um
h_conductor = 0.2 um

Can I just model the conductor as a planar structure with perfect E boundary conditions? Or should I simulate it as a solid (finite thickness) PEC?

Can I just extend the substrate lamda_g/3 below the conductor and place radiation boundary conditions on the bottom of the substrate. Or should I extend it down the true substrate thickness, put air below it, then put radiation boundary conditions on the air face?