Probe feed in IE3D

Hi,
I try to simulate an antenna from the book "Compact and Broadband Microstrip Antennas" in IE3D program. The books state that the design was also simulated in IE3D, however, my graph of the return loss is significantly different. My initial thought was that my probe feed was too big, however, making it smaller hasn't help.
I've attached my design as well as the relevant pages from the book and hope for your answer.
Thanks alot,
Neil

I too have worked extensively using that specific textbook and have not been able to replicate any of his results. I found that I could not recreate any results from any papers by that author. Try using a book called Broadband Microstrip Antennas by Kumar and Ray.