In the radio frequency (RF) frequency band (tens of GHz), the interweaving of the leads produces hole resonance, and the conductor structure that is not surrounded by the ground wire will produce electromagnetic resonance at some special frequency points. At this time, even if the leads are vertical, strong crosstalk will be caused between them. In order to eliminate interference at all frequency points, a simple and effective method is to use a multi-layer board and use an isolation layer between the signal layers. This is especially important in contemporary applications where signals are changing rapidly.