L is the inductance per unit length.
C is The shunt capacitance (between the conductors) per unit length.
R is the series resistance of the conductors (both) per unit Length.
G is the shunt conductance from dielectric losses per unit length.
mu = mu_{0} mu_{r} is the permeability
e = epsilon'  j epsilon'' is the permitivity
epsilon' is the real part of the permitivity
epsilon'' the complex part of the permitivity
R_{s} = (omega mu / 2 sigma)^{0.5} is the skin resistance
del_{s} = (2 / omega mu sigma)^{0.5} is the skin depth
omega is the frequency in radians per second
Z_{0} = (L / C)^{0.5} is the loss less impedance.
(mu_{0} / epsilon_{0})^{0.5} = 377 ohms is the intrinsic impedance of freespace.
Coaxial 



TwoWire 



Parallel Plate 

