coaxila cable feeding help please, HFSS v.11

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noor_awad

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Hello
I am working on a project of simulating a microstrip antenna to verify the results obtained in a published paper (attached)
I am new to HFSS and I can't excite the antenna to get the published results
I am working on HFSS v11 and have attached the design file I created (there may be errors (not in geometry, i think in feeding)
i tried to calculate the inner and outer diameter of the coaxial from the site below

**broken link removed**

but still the results bad
i used air filling inside the coaxial, and i tried teflon aslo but nothing change
i took the air box to be lambda /4 from the all direction
center frequency is 0.9GHz
realy i need a help
please
 

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