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Signal and Power Integrity–Simplified by Eric Bogatin

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Chapter 7. The Physical Basis of Transmission Lines

We hear the words transmission line all the time and we probably use them ever day, yet what really is a transmission line? A coax cable is a transmission line. A PCB trace 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 two conductors with length. We ...

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