OK, Now your question is clear.
You can not simulate this structure in schematic.
You have to simulate it in momentum.
1) Define your substrate in momentum.
2) Draw your microstrip line on say cond layer. (also you need to draw the guard ring on this cond layer)
3) draw your vias on a separate layer.
4) In the create/modify substrate -> layout layers tab, map your cond layer as a strip and also map the layer that you had drawn your via on as via layer.
5) simulate S parameters.
If you want to get accurate results, enable edge-mesh and also increase meshing frequency.