Problem with simulating antenna in CST

I have tried to simulate in CST but S11 is totally different see the CST design attachment. 50ohm coaxial cable is used to feed on other side of ground plane.
Parameters
Disk radius:12.5mm with patch thickness of .4mm
FGap:.4~.7mm
Ground plane:100x100mm

Hi snkhan,
I've simulated the antenna according to the paper's dimensions.
There is some difference, but all in all the results seem to be OK.
Are you getting a whole different response ?
Regards,
P.

try to check the backgound materials

Here's the model and result file.
Results included are:
1. S11
2. Azimuth and elevation cuts.
3. Z and Y matrices
4. Model script.
Regards,
P.

Hi Pushhead:
It was so nice of you to help me, so here are few more questions for you.
1) How to define Azimuth and elevation cuts in 1D results
2) Can u explain a little what is the impact of defining add space as it makes results quite different "Actually this was the mistake with my design".
3) A little on Model script
Thanks verymuch:D

I'm glad i could help.
1. The radiation pattern cuts are derived from the full 3D farfield results. You should go to Farfield results -> Plot properties.
Once you've extracted the desired cut, copy the plot (Ctrl+C), go to 1D-results ->Add new folder -> Paste (CTrl+V).
BTW: That works for any 1D-result you have...
2. There are many aspects for setting the correct boundaries to a specific problem so I won't elaborate on this. In your case the farfield calculation might have changed because of this.
3. What exactly do you want to know about my script?
Regards,
P.