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stacked shorted patch antenna in HFSS problem

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Tsardoz

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For the life of me I can't see what I am doing wrong here.
The upper patch is supposed to be slightly detuned from the lower patch, resulting in wider bandwidth.
The design is from

Broadband stacked shorted patch antenna for mobile communication handsets

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=985629&tag=1

However I have a few problems:

- The supplied dimension of 7.5 mm of feed from shorting wall does not seem to work. The return loss is terrible.
- I do not get two close resonant peaks at 1800 MHz, forming a wide bandwidth peak. Instead I get a single sharp peak like I would expect for a single layer patch antenna.

What am I doing wrong?
 

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