GATE EC 2001 Electromagnetics Solution Q 8 - Grad Plus

# GATE EC 2001 Electromagnetics Solution Q 8

A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected ?

(a) 10%

(b) 25%

(c) 50%

(d) 75%

Ans: (b)

Explanation

s=\frac{1+\left|\Gamma\right|}{1-\left|\Gamma\right|} 3=\frac{1+\left|\Gamma\right|}{1-\left|\Gamma\right|} \left|\Gamma\right|=0.5 \frac{P_r}{P_i}=\left|\Gamma\right|^2=0.25
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