How to plot gain vs frequency curve in HFSS

[aswin_kmr]

When i surfed in net i could get these information for plotting gain vs frequency curve but i could'nt get any plot when using this,

1. Right-click the Infinite Sphere icon in the project tree, and then click Compute Antenna Parameters on the shortcut menu.

The Antenna Parameters dialog box appears.

2. Under the Solutions tab, select the solution for which you want HFSS to compute antenna parameters.

3. Under the Intrinsic Variables tab, select the solved frequency point at which you want HFSS to compute gain.

Pease help me how could i get a plot by using the above information????

 

[PlanarMetamaterials]

Ensure that you're saving fields for each step in the frequency sweep. I believe you also need to use a discrete sweep.

 

[aswin_kmr]

thanks for the reply, i've got the gain plot.
could you suggest me any technique for improving my gain, which will effect on gain parameter either the selection of substrate material which we use or the dimension of our antenna or the type of antenna??