Dear Kiran Kumari , the question about the density of points in a 1 Ghz interval in a wave plot or other plot, could be interested.

You can use points density and obtain physical insights if you have a robust set of points per one Ghz interval.

Best Regards.

This structure has a slow-wave region below 4 GHz, and possibly a band gap close to 4 GHz. The operating frequency you choose depends on what you want the structure to do. What speed do you want the wave to be travelling?

Thank you Malcolm white. Can we use this structure as a slow wave in an antenna operating at 2.45 GHz or 3 GHz frequency

At 2.45 to 3 GHz the group velocity is about half the speed of light, which is not very slow and probably not what you want. If you want a structure which is slow at these frequencies make it 20% to 25% bigger.

Thank you so much malcom white for your guidance it means a lot for me.