Absorption
If an RF signal passes into a material that can absorb some of its energy, the signal will be attenuated. The more dense the material, the more the signal will be attenuated. Figure 3-10 shows how a signal is affected by absorption and how a receiver might be affected by the lower signal strength.
One common example of absorption is when a wireless signal passes through a wall in a building. Different wall materials absorb different amounts of energy. For example, a wall constructed from gypsum ...
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