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need a help to design a spiral antenna using CST MWS

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kaandee

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hi friends,
I have designed square spiral antenna using CST MWS 2009.
Result for S11 VS frequency is not matched with sample paper.
plz help me why these result is different from original one.

It might be with coaxial feeding. i have attached model and sample paper. final result is in Figure 9.
thank you.
 

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