feed a 2layer patch antenna - HFSS

Hello! I want to model a 2 layer patch antenna: ground - layer 1 - patch 1 - layer 2 - patch 2. Both patch 1 and patch 2 need to be fed by the (same) coaxial cable. How can I model that. When I am creating the 2 layers, then HFSS doesn't let me create a unique pec cylinder representing the inner conductor of the coax (it says that the layers intersect with the pec object). Should I create two separate ones? And should I remove a circular part out from patch 1 at the point where the inner conductor (1) is connected with the inner conductor (2)? Please help!