Question

Which of the following is the Friss transmission equation for the matched polarization of antennas?

(a) \(\frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{(4πR)^2}\)

(b) \(\frac{P_t}{P_r} = \frac{G_t G_r\lambda^2}{(4πR)^2}\)

(c) \(\frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{4πR^2}\)

(d) \(\frac{P_t}{P_r} = \frac{G_t G_r\lambda^2}{4πR^2}\)

The question was asked by my school teacher while I was bunking the class.

The doubt is from Friis Transmission Equation topic in portion Antenna Parameters of Antennas

Answer 1

Right choice is (a) \(\frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{(4πR)^2}\)

Explanation: Friss transmission equation is used to calculate the power received by the receiving antenna when transmitted from other antenna separated by a distance R. the equation is given by \(\frac{P_r}{P_t} = \frac{G_t G_r \lambda^2}{(4πR)^2}.\)