Help me with simulating RFID 13.56 tag on CST

Hello,
I am having my bachelor thesis on RFID. i need to simulate a RFID 13.56 tag using CST microwave studio.

Can anyone help me in that?
Attached is my simulation trial, but unfortenately it doesn't give any good results.
So if you have any idea why is that?

For any helping material please send it to
andrew.morcos(at)gmail.com

Thank you in advance.