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Improve s11 of pifa antenna

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mirou

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Hello every Body,
I'm a student and i work on PIFA antennas, i have designed a pifa antenna with coaxial Feeding
but i have a problem i can't improve the value of s11, i have a good resonate frequency 2.4 GHz
but s11 always > -10 db.
Any one can help me here. It's urgent and thanks for advance.
i can see you my antenna.
View attachment pifa 2 -probe feeding.rar
 

Please it's urgent i must send the project to my framer.
who can help me ?
 

Hello Dear BradtheRad,
i can't understand you. But just i want to improve the value of s11 to become < -10 db this is my problem.

- - - Updated - - -

Hello every Body,
I'm a student and i work on PIFA antennas, i have designed a pifa antenna with coaxial Feeding
but i have a problem i can't improve the value of s11, i have a good resonate frequency 2.4 GHz
but s11 always > -10 db.
Any one can help me here. It's urgent and thanks for advance.
i can see you my antenna.
 

To get better return loss (S11) first thing you have to change the width of the resonant plate, and second, to adjust the location of the feeding point.
Now you have about -5dB return loss at 2.4 GHz. Perhaps you have to make it below -15dB to get a decent antenna bandwidth at the resonant frequency.
 
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    mirou

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Hello Vfone,
Thank you for your reply. Ok i understand you.
For the width i must increase or decrease it and for the position of feeding point too.
 

Hello Vfone,
Thank you, i finished the work with better return loss s11=-12 db.
 

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