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Is ground plane required on top and bottom layers?

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  • Is ground plane required on top and bottom layers?

    Hi all,

    I wonder is ground plane really required for free spaces around board on top and bottom layers for multi layer boards (4 layers and more)? Normally I have seperate internal gnd layers. What are your thoughts?

    Thank you.
    Last edited by brs; 04-23-2020, 03:45 AM.

  • #2
    I do not pour GND into empty spaces between tracks and I have never seen any problems with that.

    PS: Actually some time ago I read an article, that improper GND pour between tracks can make it worse (especially for EMC and EMI) and I think it can be truth.

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    • #3
      Actually I meant space around circuits, edges of the board, not between tracks. I see that most people pour gnd into all the spaces as a general behavior.

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      • #4
        I see that most people pour gnd into all the spaces as a general behavior.
        - that is what I meant ... pouring gnd into all spaces

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        • #5
          Hi,

          I personally check the "Remove dead copper" icon in Altium to remove any copper which does not connect to GND or a power plane.
          Also avoid copper between tracks.

          Hope it helps.

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