Coplanar Waveguide with Ground via placement

[salmanmahmood]

Hi all,

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?

Thanks in advance,
Regards,
Salman

 

[marce]

https://www.jlab.org/accel/eecad/pdf/050rfdesign.pdf
**broken link removed**

might help, or give leads for more research, me I get them as close as I can.

 

[salmanmahmood]

Hi,

I went through these documents before. They dont provide guidelines on via placement.

Regards.
Salman

 

[sivamani]

I read some where, where they said that from copper edge to drill should be 1 time the via drill size..But could not find that reference...

 

[marce]

As I said get them as close as possible.

 

[DonnyP]

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.