I need to make a coplanar waveguide with ground and I need to know what via spacing to use for strapping the ground to the ground plane. My operating frequency is 1900 MHz (Using GSM). Are there any calculations which can be used for this purpose?
For your frequency, you can space the via pitch equal to or less than 0.080" and you'll be fine. Have the vias so that the hole edge is a distance equal to or less than the trace width. Sparing the theory, because it is really involved, but for a quick and dirty answer for what you need, you'll be fine with these rules. Things get a lot more interesting at higher frequencies.