Question

What is characteristics impedance of transmission lines

Answer 1

A transmission line drawn as two black wires. At a distance x into the line, there is current phasor I(x) traveling through each wire, and there is a voltage difference phasor V(x) between the wires (bottom voltage minus top voltage). If {\displaystyle Z_{0}} Z_{0} is the characteristic impedance of the line, then {\displaystyle V(x)/I(x)=Z_{0}} V(x)/I(x)=Z_{0} for a wave moving rightward, or {\displaystyle V(x)/I(x)=-Z_{0}} V(x)/I(x)=-Z_{0} for a wave moving leftward.

Schematic representation of a circuit where a source is coupled to a load with a transmission line having characteristic impedance {\displaystyle Z_{0}} Z_{0}.

The characteristic