I'm drawing a 2-sided PCB. First time.
How to treat the space between traces on the side of PCB where signals are routed?
Is it an advantage or disaster to fill the empty space with ground plane(s)?
There is a ground plane on the other side of the board, only interrupted by some power lines and some short signal traces.
Will weird things happen if there are ground planes on both sides of PCB (like a sandwich)?