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Questions about Copper Pour in PCB design

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Advanced Member level 1
Jul 13, 2001
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Hi all,

I have a few doubts relating to PCB design:

1. What is the significance of 'Copper Pour attached to GND NET' in PCB design?
2. What are the applications in which it is recommended?
3. Where is it not recommended?
4. Is it advisable to select the entire PCB and 'Pour Copper attached to GND NET' OR just fill certain critical areas?
5. ON the same layer, is it advisable to fill copper attached to different Nets?
5. How do you undo Copper pour in Layou*t Plu*s?

Views welcome.


prevents floating

Connecting it to ground keeps it from floating. This ground area reduces cross coupling between the traces on opposite sides of it. It also helps in preventing board warp by making the copper area on both sides almost equal.

Copper pour

I would love to see the other questions also answered by our experts.


It is more important with high speed digital circuits to have good return paths for the signals, as the return path tries to follow as closely as possible the signal path.
So copper pour is used to make power planes, one layer a ground plane, the other the supply plane.
It is not a good idea to flood the signal layers, as the greater area tends to radiate noise and crosstalk.
This is in fact, quite a complex subject and not one that can be answered in a few short lines.

It is used too, for avoid noise on high sensitive circuits, like as preamplifiers, some rf circuits, but the best way to avoid noise is use an metal foil covering all board and linked to GND.

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