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Antenna & Wave PropagationFriis Numericals

At wavelength 1 m and separation R=100 m, two isotropic antennas have an ideal free-space received-to-transmitted power ratio closest to?

  • A6.33×10^-7
  • B6.33×10^-5
  • C7.96×10^-4
  • D1.0×10^-2
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Correct Answer: A. 6.33×10^-7
Explanation: (1/(4π×100))²≈6.33×10^-7.
Reference: Standard antenna and wave propagation: friis numericals
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