The shielding protection corresponds to the ground wire loop rule. In fact, it is also to minimize the loop area of ​​the signal. It is more common in some more important signals, such as clock signals and synchronization signals. For some particularly important signals with particularly high frequencies, copper should be considered. The shielding structure design of the axial cable, that is, the line to be laid is separated by ground wires, and it is also necessary to consider how to effectively combine the shielding ground with the actual ground plane.