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Antenna & Wave Propagation Friis Transmission

In ideal free-space propagation, if the distance between transmitting and receiving antennas is doubled while all other factors remain unchanged, received power becomes?

ATwice
BHalf
COne-fourth
DOne-eighth

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Correct Answer: C. One-fourth

Explanation: The Friis equation gives received power proportional to 1/R², so doubling distance reduces received power to one-fourth.

Reference: Standard antenna and wave propagation: friis transmission

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