I am designing two RF tracks (Transmission lines) based on Grounded Coplanar waveguide. The length of both tracks is same, but there is still a phase difference between two tracks.
I don't know. You could try this calculator
https://wcalc.sourceforge.net/cgi-bin/coplanar.cgi
I would guess there is some dependence of wavelength on substrate thickness slot width. It doesn't take many percent to build up to an annoying phase difference over several wavelengths.
Marina Qasim Yes, the propagation constant of the CPW mode will vary slightly depending on the various conductor/spacing geometries.
If you are seeing this difference in simulation, for lines that should be identical, it could be an indication that the simulation is not sufficiently converged.
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