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What is the distance between antennas to apply the Friss transmission equation in terms of antennas largest dimension?

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What is the distance between antennas to apply the Friss transmission equation in terms of antennas largest dimension?

(a) R » 2D^2/λ

(b) R « 2D^2/λ

(c) R » 2λ^2/D

(d) R « 2λ^2/D

This question was posed to me in an international level competition.

This is a very interesting question from Friis Transmission Equation topic in section Antenna Parameters of Antennas

1 Answer

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Best answer
Right option is (a) R » 2D^2/λ

Best explanation: The transmitting and receiving antennas are in a far zone to each other. So the separation distance between them is R » 2D^2/λ.

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