As mentioned by Mr. Ghanshyam Singh that every simulation software has boolean operation (such as unite, subtract, split etc.), these options can be accessed as "Modeler" ------> "Boolean" -------> "Unite" in ANSYS (or HFSS) software.
If you have to perform any of these operation, first select the objects that you have to unite and follow the above steps.
For your information, a snapshot has been attached. If you still face any problem, I'll send you the snapshots of the step by step process.