Weissberger's model

From Wikipedia, the free encyclopedia
  (Redirected from Weissberger's Model)
Jump to: navigation, search

Weissberger’s modified exponential decay model, or simply, Weissberger’s model, is a radio wave propagation model that estimates the path loss due to the presence of one or more trees in a point-to-point telecommunication link. This model belongs to the category Foliage or Vegetation models.

Applicable to/under conditions[edit]

  • This model is applicable to the cases of line of sight propagation. Example is microwave transmission.
  • This model is only applicable when there is an obstruction made by some foliage in the link. i.e. In between the transmitter and receiver.
  • This model is ideal for application in the situation where the LOS path is blocked by dense, dry and leafy trees.


Frequency: 230 MHz to 95 GHz[1]

Depth of foliage: up to 400 m


Formulated in 1982, this model is a development of the ITU Model for Exponential Decay (MED).

Mathematical formulation[edit]

Weissberger’s model is formally expressed as


L = The loss due to foliage. Unit: decibels (dB)

f = The transmission frequency. Unit: gigahertz (GHz)

d = The depth of foliage ‘’’along’’’ the path. Unit: meters (m)

Points to note[edit]

  • The equation is scaled for frequency specified in GHz range.
  • Depth of foliage must be specified in meters (m).


  • This model is significant for frequency range 230 MHz to 95 GHz only, as pointed out by Blaunstein.
  • This model does not define the operation if the depth of vegetation is more than 400 m.
  • This model predicts the loss due to foliage. The path loss must be calculated with inclusion of the free space loss.[2]

See also[edit]


  1. ^ Radio propagation in cellular networks, N. Blaunstein
  2. ^ Introduction to RF propagation, John S. Seybold

Further reading[edit]

External links[edit]