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PCBs, copper pours, ground planes, and you

(lcamtuf.substack.com)
284 points surprisetalk | 1 comments | 30 Jan 25 04:33 UTC | HN request time: 0.214s | source
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pcdoodle ◴[30 Jan 25 16:42 UTC] No.42879480[source]▶
Without a ground pour, isn't each trace basically an antenna?
replies(2): >>42881652 #>>42883397 #
1. mort96 ◴[30 Jan 25 20:07 UTC] No.42881652[source]▶
Well not if there's a ground plane beneath, with 4 layers you can have signal traces on the outer layers and make the inner layers ground and every trace will have a good ground reference.

With a 2 layer board though, one layer's "copper pour" is the other layer's "ground plane"... Yet the article seems to advocate that you shouldn't use copper pours for 2 layer boards either? That's weird.