CHAPTER 7The Physical Basis of Transmission Lines
We hear the term transmission line all the time, and we probably use it every day, yet what really is a transmission line? A coax cable is a transmission line. A PCB trace and the adjacent plane beneath it in a multilayer board is a transmission line.
TIP
Fundamentally, a transmission line is composed of any two conductors that have length. This is all it takes to make a transmission line.
As we will see, a transmission line is used to transport a signal from one point to another. Figure 7-1 illustrates the general features of all transmission lines. To distinguish the two conductors, we refer to one as the signal path and the other as the return path.
Figure 7-1 A transmission line is any ...
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