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Antenna & Wave PropagationFresnel Zone

At the midpoint of a 10 km link operating at wavelength 0.1 m, the first Fresnel-zone radius is approximately?

  • A5 m
  • B15.8 m
  • C22.4 m
  • D50 m
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Correct Answer: B. 15.8 m
Explanation: At midpoint, r1=sqrt(lambda d1 d2/(d1+d2))=sqrt(0.1×5000×5000/10000)=sqrt250≈15.8 m.
Reference: Standard antenna and wave propagation: fresnel zone
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