Question: Which of the following is the Friss transmission equation for the matched polarization of antennas?
Options
A : \frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{(4?R)^2}
B : \frac{P_t}{P_r} = \frac{G_t G_r\lambda^2}{(4?R)^2}
C : \frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{4?R^2}
D : \frac{P_t}{P_r} = \frac{G_t G_r\lambda^2}{4?R^2}
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