What is the best way to connect ground planes together ?
I know that ground planes are connected together at multiple locations in order to keep a low impedance GND across the whole board and provide a return path for the signals.
But, in addition to the via put very close to every decoupling capacitors,
I have seen layouts where a lot of vias are added with a grid pattern, with a spacing of 1/20th of the maximum wavelength on the board.
On other boards the vias are put along the traces (like "Placement of Vias to Connect Ground Planes").
I have seen the vias scattered randomely.
There is also combination : Vias along the lines + scattered randomely on the GND planes.
Is there noticiable differences ?
What I would like to achieve is good signal integrity, low radiation and a good power supply decoupling.