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4.7
Material characteristics
Siemens AB
Security Products
The following illustrations show how different materials attenuate and reflect a sig-
nal.
Water (including rain drops and human beings) absorbs the radio energy and
thus degrades the signal.
Remember that an open door may result in less absorption and/or reflection.
Keep doors shut while testing.
1.
Incoming signal energy (free air).
2.
Signal energy going through (not attenuated). Depend on density of the material.
3., Reflected signal energy.
Fig. 7
Brick wall/Clear glass window
Fig. 8
Drywall/Plaster
Fig. 9
Metal wall/Metal screened glass
Planning a wireless application
23
03.2014
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