I am with difficult to simulate a monopole antenna in CST.

Hello people,

I am with difficult to simulate a monopole antenna in CST.
First, I just put a ground plane and a cylinder.
A fed was done with discret port and the thickness between the port and plane ground was 0.05 mm.
The result to resonant resistance was 35.3 Ohms and the resonant frequency was 1.195 GHz.
The 3D radiation diagram seemed strange but in xy plane it was omidirecional.
Is this way correct?

Please, guys, help me.

---------- Post added at 17:46 ---------- Previous post was at 16:34 ----------

I didn`t understand.
Can you explain for me?