thickness effect

I desgned a patch of dimensions 60*90 and the conductor thickness is 0.0002mm and i got a resonant freq at 2.3Ghz.When im designing the same patch but of different conductor thickness,1mm, I am getting my resont frequency at 2Ghz.Can anyone tell me what is the effect of thickness of a conductor on resonant frequecy and whether it is goverened by any other factors?

I don?t think exist a formula to find the exact influence of metal thickness on the patch antenna resonant frequency, but definitely it will affect the antenna resonance, due to changing the fringe field currents. EM simulation will give the best answer.

thanks for the reply but can u explain to me in detail why the effect happens so?

mmmhhh ...
I suppose the plate is copper made.
Are You sure that a 0.0002mm thick metal plate is resonant at 2.3 GHz?
I don't think so.
For a plate, a condition to be a resonator is: the plate must be reflective.
A patch thickness 5 times less than penetration factor, as You are speaking about is not a reflector.

Try to simulate thickness greater than penetration factor.