Negative directivity in Metamamaterial antenna design

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MrElec

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Negative directivity

Hello,

I've designed a Metamaterial antenna working at 434MHz but it shows a negative directivity (-3.2 dB)?!!

What do you think about this problem?

thanks for help.
 

Re: Negative directivity

Hello
please attach your design and result for antenna
 
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    MrElec

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    toutou06

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