I'm trying to simulate a Biconical antenna in CST, but I having problems. It should be feed usind a coaxial cable thrugh the cones.

Does anyone have some kind of advice for this simulation or any model that have good agreement with measures?

Here is the model I have done, if someone wants to have a look, done in CST 5.2. The metalic wall sectioning the cones is imposed for construction considerations (don't ask me why). I think that tetraedral so close to the port is the origin of the problems.

I have tried a subgrid-meshing to get enough mesh between the port and the metallic wall, but simulation takes too long. I'm afraid that more than 250k mesh are too much for my computer. Cones are sustituted with pyramids to get less mesh as well.

In addition, and just to make things evenmore complicated, I would like to simulate it from 3 to 12 GHz, eventhough it is enogh from 4 to 6 GHz for a first approximation.

The model I'm trying to simulate has been measured and shows the S11 response that I have uploaded. My aim is a CST model with that response for a new design stage.

Can somone please helpme?

Thanks in advance :)