i simulate a 24GHz patch antenna with IE3D and after a made this antenna and measure it but the result if very different.
my resonant frequency is near 23.5 GHz in real.
where did my problem come from?
is it a problem of simulation ?
Did you simulated the antenna with finite ground plane?
Also confirm the loss tangent and dielectric permitivity of the PCB you are using during IE3D design. Try to increase bandwidth a little.
Try increasing the mesh frequency
Or simply analyze the same design to achieve resonant frequency of 23.5 GHz. This way you will know which parameter is affecting the resonant frequency