Question

When an arbitrary length of any general transmission line, is terminated in an open circuit or a short circuit, its input impedance is determined completely by

• A. the propagation factors, the characteristic impedance and line length
• B. the propagation factors and line length
• C. the characteristic impedance and line length
• D. the propagation factors alone

Hint:

Input impedance of transmission lines, especially with open and short circuits is defined by the parameters related to propagation of signals and the impedance of the transmission line.

Answer 1

The Correct Option is A

The input impedance of a transmission line, when it is terminated in either a short or open circuit, is determined by its propagation characteristics, which includes both the attenuation constant \( \alpha \) and the phase constant \( \beta \) (these two form the complex propagation constant), the characteristic impedance \( Z_0 \) and the length of the line \( l \). The impedance changes along the length of the line.