As we saw in Figure11.7, when an HF Signal flows in a PC track running over a ground plane the arrangement functions as a microstrip transmission line and the majority of the return current flows in the ground plane underneath the line.

• 如图11.；7，高频信号伴行地线传输时，可以将其视为“微带线”，这时大部分返回电流都会从信号线下方的地线流过。