The major factor of efficieny of tri-band PIFA?

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Le

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Hi all,

I am simulating tri-band planar antenna in which S11 of all resonant frequency is only around -3.5dB, I would like to have some advice on what major factor to affect antenna efficiency.

Best Regards,
Le
 

The reason may be impedance mismatch.
 

Ok, it seems to be good.
Thank you
 

Very nice for TDK RF antenna_paper
 

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