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please help..big problem with patch antenna

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majidmad

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hi
I've to design a wideband patch antenna operating at 3.5 GHz and in rang of 1 to 6 GHz. I designed it but I have some problems in optimizing.
I upload my results but as you see it doesn't work in that frequency rang. please help me how could I optimize it an how could I put it below the -10 db in the selected area ?
I'm so grateful for your help.[/img]
 

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