Measuring Standing Waves of Current.
28. The impedance varies along a mismatched line.
the voltage to the current at that point.
Figure 16 shows that the
impedance varies along a shorted line.
This happens because the waves
reflected by the short cause the voltage and current to vary.
Part A of
Figure 17 shows the standing waves of voltage and current along a line which
is one wavelength long. The voltage is minimum and the current maximum at
the shorted end.
The impedance at the shorted end is zero.
maximum because of the maximum voltage and minimum current at that point. A
half wavelength back from the short, the impedance is minimum again.