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Friss transfer formula is given by _____(a) \(P_r = P_t G_r G_t (\frac{λ}{4πR})^2 \)(b) \(P_r = P_t G_r G_t (\frac{λ}{4πR})\)(c) \(P_r = \frac{P_t G_r G_t}{\frac{λ}{4πR}}\)(d) \(P_r = P_t G_r G_t (\frac{λ}{4πR^2})\)I had been asked this question at a job interview.My question is based upon Measurement of Gain in division Modern Antennas & Antenna Measurements of Antennas

Answer»

The correct ANSWER is (a) \(P_r = P_t G_r G_t (\frac{λ}{4πR})^2 \)

To explain: Friss transmission is basis for the ABSOLUTE GAIN measurement. The Friss TRANSFER equation is given by \(P_r = P_t G_r G_t (\frac{λ}{4πR})^2 \,where\, G_r,G_t \) are the gains of receiving and transmitting antenna respectively.


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