Hi, Leilon
I think your model is not correct. The two upper rectangular patches are isolated, though they are perfect E. They won't function properly as in the paper. That is to say your model is not a cpw fed antenna, it's a patch antenna with two parasite patches.
I tuned the model a bit and simulated, the result can be seen as below.
For the antenna is purely a 2 dimensional one, I suggest you use IE3D, ADS momentum or Ansoft Designer to simulate. If hfss is preferred, I suggest you read a topic in this post: .
Hi Mustafa,
I simulated. it's approximately near the interested result that obtained with CST.
I think that using discrete simulation and increase accuracy this result near the interested result. I am learning CST 2008, and I try with it in future too.
Thanks for helping