In the previous chapter we reviewed static electric fields due to stationary charge distributions, and static magnetic fields, due to the charges moving at constant speed, i.e. dc currents.
A transmission line can be modeled as a distributed parameter circuit consisting a series of small segments of length Δz, as shown in Figure 17.1
The distributed parameters describing the transmission line are:
The transmission line model in Figure 17.1 describes a lossy transmission line. To gain an insight into transmission line theory it is very helpful to consider a lossless transmission line first. Such a transmission line is shown in Figure 17.2.
To obtain the transmission line equations let’s consider a single segment of a lossless transmission line shown in Figure 17.3.
Writing Kirchhoff’s voltage law around the outside loop results in