The concept of impedance and characteristic impedance is easily confused, and many books are highlighted. It should be pointed out that it
Not the ratio of the voltage wave and the comparation of the current wave on the transmission line, but
Positive wave. The negative value of the ratio of the voltage wave and the voltage wave of the current wave can also be reverse.
Although the physical meaning of impedance and characteristic impedance expression is different, it is the ratio of complementary voltage and complex current, so they can compute the matter when considering transmission line loads.
