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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 :eek:
 

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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