Question

If the operating frequency increases, powers received by the receiving antenna ______

(a) will decrease

(b) will Increase

(c) is Independent of frequency

(d) is not predictable

Answer 1

Right choice is (a) will decrease

The best explanation: From the Friss transmission equation, the received power depends on the wavelength which is inversely proportional to the frequency. So the power decreases as the frequency increases.

(frac{P_r}{P_t} = frac{G_t G_r λ^2}{(4πR)^2} = frac{G_t G_r c^2}{(4πRf)^2} )