Your results are very close to the measured results given by the paper. This kind of a variation is expected, especially when working with antennas. The difference between -20 and -27 dB is totally ignorable. There are a few things you can do to improve you simulation setup:
1- Increase the number of passes in the analysis setup. (10 was not enough for the sim to converge)
2- Use a smaller step size in sweep options for better resolution in your plot.
Hi all, i am doing antenna design by using HFSS also. I get a nice return loss but my gain only 3dB. Any suggestions to improve the gain? help....thanks
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