Characteristic admittance

Characteristic admittance is the mathematical inverse of the characteristic impedance. The general expression for the characteristic admittance of a transmission line is:

Y 0 = G + j ω C R + j ω L

where

R is the resistance per unit length, L is the inductance per unit length, G is the conductance of the dielectric per unit length, C is the capacitance per unit length, j is the imaginary unit, and ω is the angular frequency.

The current and voltage phasors on the line are related by the characteristic admittance as:

I + V + = Y 0 = − I − V −

where the superscripts + and − represent forward- and backward-traveling waves, respectively.