What dimensions should I change to increase bandwidth in rectangular patch antenna?

hi, can anyone tell me what is the dimensions i have to change in rectangular patch antenna to increase Bandwidth without changing the operating frequency?

Hi, kh_mob:

The simplist and very effective way is to increase the substrate thickness. If the substrate thickness is fixed, you can make the patch wider or bigger dimension in the non-resonating side. Regards.

I have this pdf's try it