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Via creation in PCB

- July 31, 2020 at 5:26 pm
  
  prajput
  Ansys Employee
  
  I have a 4 layer PCB, do I need to create a single via or a via array for isolation?
- July 31, 2020 at 5:27 pm
  
  Charlotte Blair
  Ansys Employee
  
  Hello,
  That's all depends on the operating frequency. At low frequency, a single ground via may be sufficient to keep ground as ground but as you go higher in the frequency you may need to create a via fence to keep the signal isolated from other parasitics.
- July 31, 2020 at 5:28 pm
  
  prajput
  Ansys Employee
  
  Thank you for the response.
  How much space should I put between the vias then?
- July 31, 2020 at 5:28 pm
  
  Charlotte Blair
  Ansys Employee
  
  Hi - The rule of thumb is lambda/20 but it depends on your application.
- July 31, 2020 at 5:29 pm
  
  prajput
  Ansys Employee
  
  If I have to consider the fourth harmonic should I decrease the spacing?
- July 31, 2020 at 5:30 pm
  
  rtk
  Ansys Employee
  
  In addition to the above responses, depending on which harmonic you are concerned about will dictate the spacing. From the RF/microwave perspective, more ground vias are better.

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