1.

A lossless transmission line is terminated with a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is  (A) 57.73 (B) 33.33  (C) 0.11 (D) 11.11 

Answer»

Correct option (D) 11.11

Explanation:

VSWR = 2 

Reflection coefficient is given by,

|Γ| = (s - 1)/(s + 1) = (2 - 1)/(2 + 1) = 1/3

 The ratio of reflected power to incident power is given by,

Pr/Pi = |Γ|2

where, Γ = reflection coefficient at load

Pr/Pi = (1/3)2 = 1/9 = 0.11

In percentage, Pr/Pi = 11.11%



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