How to calculate the feed point of antenna PIFA

hi

please help me...It is urgent..
calculating the feed point for Probe-fed of PIFA antenna

it is a square patch.
L=W=15 mm
f=2,42 GHz
L=30 mm
f=2,42 GHz
wavelength=120 mm
G=15 mm
H=8 mm
S= 4 mm


Px=?


Please calculate the feeding point for me
i will be very thank ful to you

the feed impedece pls !

- - - Updated - - -

50 ohms ? wich feed you using to simplify the calculation of the feed point to get a proper impedence adaptation