The effect of plastic on planar antenna

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Dear All,

Recently, I am simulating mobile tri band planar antenna which is mounted on plastic bracket, the material of plastic bracket is ABS. I would like to know the material property of ABS, e.g. permeability, permitivity, etc. And, I would like to know how much it affects antenna resonant frequency? Please advise me.

Thanks all of you!

Best Regards,
Le ^.^
 

Usually, the plastic bracket will affect tje antenna resonanct frequency a few percentage, depending on how much brackets used and where they are positioned. This offset have to be considered when designing the antenna.
 

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    Le

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If the plastic sprayed with metallic paint..... it will act a little more like a metal plate towards the antenna
 

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