# Calculating the total power received by an antenna

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A radar antenna transmits 50kW at 10 GHz. Assume transmission is in a narrow beam, 1m^2 in area, and that within the beam, waves are plane waves. The wave is reflected from an aircraft but only 1% of the power propagates i the direction of the antenna. If the airplane is at a distance of 100km,

Calculate: The total power received by the antenna. Assume Permittivity and permeability of free space and conductivity of 10^-7 S/m.

ANSWER: The answer is 0.266 W (I can't seem to get it.)

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scottdave
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Can you show what you have attempted, so far? Then we will make suggestions to guide you.

Can you show what you have attempted, so far? Then we will make suggestions to guide you.
Thanks for the interest, I already attached the PDF file of my work, let me know if you can't see it.
I also attached a second attempt of the problem, to this post.

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scottdave