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

What is the distance between antennas to apply the Friss transmission equation in terms of antennas largest dimension? Correct Answer R » 2D2/λ

The transmitting and receiving antennas are in a far zone to each other. So the separation distance between them is R » 2D2/λ.

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