Differential feeding for a triangular Bow Tie Antenna in CST Studio Suite

Hi everyone,
I am new to CST Studio Suite and I am trying to design a triangular Bow Tie Antenna. The triangles are made of copper and they are placed on FR-4 material. My problem is that I don't know how to design the differential feeding for the antenna. Can I use two discrete ports or do I have to design an extra differential port?
Can anyone please help me?
Thanks

You can use one discrete port between the two halves of your bow tie antenna