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Too small gain of cpw-fed metamaterial antenna

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Zener Chang

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Recently, I try to simulate a cpw-fed metamaterial antenna based on the paper below.
View attachment 2_1.pdf
However, there are some problems on the radiation pattern. The gain is too small about -5.6 dBi.
image1.PNG
The file below contains the model I made in HFSS.
View attachment new_1.zip
Can anyone tell why the gain is so small? The feature of metamaterial antenna? or the wrong setting of the excitation?
 

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