Help Required on Simulating Antenna Designed on ADS

Hello
I have a antenna design obtained from the internet. I have implemented the same in Agilent ADS. As far as I am aware I have followed all instructions apart from where it specifies a via. I used a circle (in the layer called hole). When I check the 3-D view of the antenna the top and bottom layers are connected.

However, when I simulate the design, my results do not match with the expected results. Your thoughts will be helpful. Attached are the original documents and the Agilent ADS file.

Your help will be truly appreciated.

Thanks

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