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S11 problem

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Bara'a

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Hi all,

Actually i have designed a multilayer rectangular antenna using CST,but i face a problem in the simulation which S11 in the simulation always appear more than 0 dB, i have tried to change many parameters but the problem still.i don't know wt's the problem!!

Could anybody help me to find a solution for the mentioned matter,please ?
 

i attached an image show the problem.



Appreciated
 

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