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Antenna & Wave PropagationFriis Numericals

For two isotropic antennas in ideal free space, the Friis power ratio Pr/Pt is?

  • A(lambda/(4 pi R))²
  • B(4 pi R/lambda)²
  • Clambda/(2 pi R)
  • DR²/lambda²
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Correct Answer: A. (lambda/(4 pi R))²
Explanation: With unity antenna gains, Friis gives Pr/Pt=(λ/(4πR))².
Reference: Standard antenna and wave propagation: friis numericals
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