(a) A transmitting antenna with a directivity of 30 dBi takes an input power of 12 kW and its efficiency is $85 \% \mathrm{~W}$. Find the maximum possible power density at a distance of 5 km from it.
Explanation
The maximum possible power density at a distance of 5 km from the transmitting antenna can be calculated using the formula $P_d = P_t imes D imes \eta imes (4 \pi r^2)^{-1}$. The input power $P_t$ is 12 kW, the directivity D is 30 dBi, the efficiency $\eta$ is 85%, and the distance r is 5 km. Substituting the values, we get the maximum possible power density $P_d = 0.014 W/m^2$.
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