For low frequency
Primary constants:
(i) The series resistance per unit length R is proportional to the square root of frequency.
(ii) The inductance L per unit length for a 2 wire T-line is L = \(\frac{\mu}{2}log(\frac{2D}{d})\) where pt is the permeability. D is distance between two wires. And d is diameter of each wire.
(iii)The capacitance C per unit length,
C = \(\frac{\mu}{log\frac{2D}{d}}\)
(iv) Where e is the permittivity of free space, D is distance between 2 wires and d is the distance between the plates of capacitor.
Secondary constants of T-line:
(i) The series impedance of T-line is Z = R + jwL.
(ii) The shunt admittance of T-line is y = G + JwC are the two secondary constants.
