Hi all
I am desinging a 8 layer board with multiple internal ground planes+ top and bottom blank areas filled with ground. While I have many vias to ground, I have some empty spaces on the board with no components or traces or power planes. I am debating adding ground vias in those areas to make more connections between the layers, however, since this board will reside in a computer, will more vias act as exposed antennas and essentially pick up more EMI. I plan to shield the board at least on the top side. Now, as a sub 5 MHz mostly analog board, my problems will mostly be concentrated at lower frequency and most of the parts do not have higher bandwidth, so in some ways this may not have much effect. Either way, have people experienced anything like this and at what frequency and mitigating steps need to be taken?