Planning wireless systems
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8.16 Practical examples
It is not possible to provide basic calculation principles for obstacles on the wireless path as
the obstacles and applications will vary too much. The practical examples given below are
for guidance only. They cannot be directly transferred to other applications.
The bush illustrated below is 2 m wide and has an attenuation of approximately 15 dB at
2.4 GHz. At 868 MHz, the attenuation is around 8 dB.
Figure 8-18 Bush with an attenuation of approximately 15 dB
The forest illustrated below consists of dense undergrowth with a trunk diameter of approx-
imately 5 cm to 20 cm. In our test, the 2.4 GHz wireless signal was transmitted through a
25 m forest. The attenuation was around 40 dB. At 868 MHz, the attenuation is around
22 dB.
Figure 8-19 Forest with an attenuation of around 40 dB
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