Question

In the circuit shown, all the transmission line sections are lossless. The voltage standing wave ratio (VSWR) on the line

(a) 1.00 

(b) 1.64 

(c) 2.50 

(d) 3.00

Answer 1

(b) 1.64 

The input impedance of a transmission line of length l of characteristic impedance Z₀ and terminated by load Z_L

Input impedance of shorted \(\frac{\lambda}8\) line of Z₀ = 30\(\Omega\)

Input impedance of \(\frac{\lambda}4\) line of Z₀ = 30√2 \(\Omega\) and Z_L = 30\(\Omega\)

Reflection coefficient