Which of the following are the constants of the transmission lines?

Which of the following are the constants of the transmission lines?

(A) Resistance

(B) Inductance

(C) Capacitance

(D) All of the above.

Answer: (D) All of the above

Explanation:

• a b c d constants of the transmission line( Primary line constants)
• The line constants are parameters that describe the characteristics of conductive transmission lines.

The primary line has the following constants

R = Resistance per unit length Ω

L = Inductance per unit length (Henry) H 

C = Capacitance per unit length (Henry) H

G = Conductance per unit length ℧

All these constants are independent of frequency, therefore, they are called primary constants and these constants are measured by considering both the wires of the transmission lines.

R and L elements are in series with the line (because they are properties of the conductor) and C and G are elements shunting the line (because they are properties of the dielectric material between the conductors).

G represents leakage current through the dielectric and in most cables is very small.