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Microstrip patch antenna-s shaped for 868mhz

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saikumar.elab

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Hi,
I had designed a microstrip patch antenna for 868 mhz application and which can operate between 865-871mhz. But I found that in my plot between freq and s11 parameter at 868 mhz s11=-3.67db.. how can I tune to +5db gain. The antenna size is 5×2.5cm
 

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