Planning wireless systems
105542_en_00 PHOENIX CONTACT 145
9.13 Practical examples
It is not possible to provide basic calculation principles for obstacles in the wireless path as
the obstacles and applications will vary too much. The practical examples given below are
for guidance only and cannot be directly transferred to other applications.
Bushes
The bush illustrated below is two meters wide and has an attenuation of approximately
15 dB.
Figure 9-13 Bush with an attenuation of approximately 15 dB
Forest
The forest illustrated below consists of dense undergrowth with a trunk diameter of approx.
5 to 20 centimeters. In our test, the wireless signal was transmitted through a 25 m wide for-
est. Attenuation was roughly 40 dB.
Figure 9-14 Forest with an attenuation of about 40 dB
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