The significance and design difficulties of PCB copper coating

　　The significance of copper coating is to reduce the impedance of the ground wire and improve its anti-interference ability; Reduce voltage drop and improve power efficiency; Connected to the ground wire, it can also reduce the loop area. For the purpose of minimizing deformation during PCB soldering, most PCB manufacturers also require PCB designers to fill open areas with copper sheets or grid like ground wires. If copper plating is not handled properly, it will not be worth the loss. Is copper plating "more beneficial than harmful" or "more harmful than beneficial"?

　　Everyone knows that in high-frequency situations, 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, an antenna effect will be generated, and noise will be emitted outward through the wiring. If there is a poorly grounded copper coating in the PCB, the copper coating will become a tool for spreading noise. Therefore, in high-frequency circuits, it is important not to assume that a certain part of the ground wire is grounded, which is called the "ground wire". It must be grounded at a value less than λ/ At a spacing of 20, holes are drilled in the wiring to ensure good grounding with the ground level of the multi-layer board. If the copper coating is handled properly, it not only increases the current but also plays a dual role in shielding interference.

　　There are generally two basic methods of copper coating, which are large-area copper coating and grid copper coating. It is often asked whether large-area copper coating is better or grid copper coating is better, and it is not easy to generalize.