Hello,
You have already designed the microstrip dont you?
In any case the easiest way is, buid your ground plane with the desired height (t), then with the local coordinate WCS, move the local coordinate -(r+t) , and now with local coordinate in (0,0) build your cylinder, your ground plane is going to be attached in the cylinder. You cannot bend a plane with thicknes (t) it should be a bend sheet, so object->face healing tools->shape from picked faces, then take the bend sheet and bend it in the cylinder. As the sheet will be bending in the cylinder you hav to give teh thickness again, objects->shell solid or thicken sheet-> give your thickness(t).
Your ground plane is bending in a cylinder, then the prosedure is the same for substrate and so on.
I hope this help you.