Should the isolated copper be removed in PCB design? PCB design skills need to pay attention to many problems, the compatibility of various devices, and the finished products are all important factors to be considered. Today’s topic is whether to remove isolated copper in PCB design?
Some people say it should be removed, probably because:
1, it will cause EMI problems.
2, enhance the ability to engage in interference.
3. Dead copper is useless.
Some people say it should be kept, probably because:
1. Sometimes large blank spaces don’t look good.
2. Increase the mechanical properties of the board to avoid uneven bending.
First, we don’t want to isolate copper (isolated island), because this isolated island forms an antenna effect here. If the radiation intensity of the surrounding wiring is large, it will enhance the radiation intensity around it; And will form the acceptance effect of the antenna, and will introduce electromagnetic interference to the surrounding wiring.
Second, we can delete some small isolated islands. If we want to keep the copper clad, the isolated island should be well connected with GND through the ground hole to form a shield.
Third, under high frequency conditions, the distributed capacitance of the wiring on the printed circuit board will play a role. When the length is greater than 1/20 of the corresponding wavelength of the noise frequency, the antenna effect will occur, and the noise will be emitted outward through the wiring. If there is copper clad with poor grounding in the PCB, the copper clad will become a tool for noise transmission. Therefore, in high frequency circuits, don’t think that the ground wire is connected to the ground somewhere, which is the “ground wire” If copper-clad is properly treated, copper-clad can not only increase current, but also play a dual role in shielding interference.
Fourthly, by drilling holes to keep the copper clad of isolated islands, it can not only shield the interference, but also prevent the deformation of PCB. The above is the analysis of PCB design to remove dead copper. I hope I can help you.
