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4.4.3
Influence of liquids and non-metallic substances
Non-metallic substances can also affect the propagation of electromagnetic waves.
When non-metallic substances or objects are located in the propagation field that can absorb
UHF radiation, these can alter the antenna field depending on their size and distance and
can even extinguish the field entirely.
The high-frequency damping effect of water and materials with a water content, ice and
carbon is high. Electromagnetic energy is partly reflected and absorbed.
Liquids and petroleum-based oils have low HF damping. Electromagnetic waves penetrate
the liquid and are only slightly weakened.
RF600
System Manual, 09/2005 Edition, J31069 D0171-U001-A0-7618,
4.4 The response of electromagnetic waves in the UHF band
RF600 system planning
4-15
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