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