Currently designing a PCB I find out there are some copper island. I was wondering if we should better keep them or remove them and why ?
Is there any manufacturing risk of having those ?
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.Sign up to join this community
If you use high frequency signalling nearby then these islands may cause some kinds of interference (crosstalk, coupling, inductive effects...). In this case it's better to via them to your GND plane.
In your specific picture you can get rid of it by moving the trace (which is north of your island) downwards slightly to take up the space occupied by the island, the island will then vanish.
If you are using no high frequencies then it will most likely not be a problem.
Alternatively, you can always ask your board fabricator to remove unconnected islands from your Gerbers before manufacture. This kind of thing is a common request and they probably won't charge you for it.