Characteristic admittance

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

$Y_0=\sqrt{\frac{G+j\omega C}{R+j\omega L}}$

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:

$\frac{I^+}{V^+} = Y_0 = -\frac{I^-}{V^-}$

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

See also

• Characteristic impedance

References

• Guile, A. E. (1977). Electrical Power Systems. ISBN 0-0802-1729-X. 
• Pozar, D. M. (February 2004). Microwave Engineering (3rd edition ed.). ISBN 0-471-44878-8. 
• Ulaby, F. T. (2004). Fundamentals Of Applied Electromagnetics (media edition ed.). Prentice Hall. ISBN 0-13-185089-X.