Effects of Vegetation

• Attenuation can approach 20 dB

  • c.f. system margin

• Species of tree

• Density and structure of foliage

• Geometry of path

  • influences propagation mechanism

• Movement of branches and foliage

• Importance of vegetation effects for planning BB FWA systems (Rec. P.1410)

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• Attenuation values can be serious for systems with low fade margins, e.g. BSS (S).

• Dynamic vegetation effects – important in windy locations.

• Note importance of considering vegetation effects when planning cellular systems for BB FWA; already looked at Rec. P.1410 in treatment of buildings in determining area coverage.