How to calculate impedance of PIFA

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Is no formula to find the impedance of PIFA.
There is a formula to get approximate resonant frequency having the dimensions of the planar element.
Length + Width = λ/4
The impedance matching is obtained by positioning the feeding point and ground shorting pin on the planar element.
 
oh, thanks. That means I should calculate geometric parameters of the planar element and then design antenna with software application and optimising it
 

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