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Help me simulate a dual-band antenna based on mushroom structures in HFSS

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MrElec

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Urgent plz...

Hello;

I'm stucked in simulating a Dual-Band Antenna based on mushroom structures behaving as metamaterials (See the article below),i can't find the errors.
For the simulation i've used HFSS V11.0 , got the following S11,radiation pattern(no image) which are far from the original results ,notice that frequencies do not match.
Please can anyone help,it's urgent i've wasted a lot of time because i'm new to HFSS.thanks.


 

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