2Troposphere (clear air)

• Absorption by atmospheric gases

  • molecular absorption by water vapour and O2
  • important bands at ~22 and ~60 GHz

• Refractive effects

  • ray bending
  • super-refraction and ducting
  • multipath
  • scintillation

Previous slide

Next slide

Back to first slide

View graphic version

• Second major propagation category.

• Two important cases to consider.