Absorption
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Absorption
Materials
- The most common RF behavior is absorption.
- Absorption is a leading cause of attenuation (loss).
- The amplitude of an RF signal is directly affected by how much RF energy is absorbed.
- If a signal does not bounce off an object, move around an object, or pass through an object, then 100 percent absorption has occurred.
- Most materials will absorb some amount of an RF signal to varying degrees.
Materials
- Brick and concrete walls.
- Signals going through a brick or concrete wall will significantly be absorbed.
- A 2.4 GHz signal will be 1/ 16 the original power after propagating through a brick wall.
- Drywall
- Signals going through drywall will be absorbed.
- A 2.4 GHz signal will be 1/2 the original power after passing though drywall material.
- Water, large water content such as paper, cardboard, and fish tanks
- Human bodies
- An average adult body is 50 to 65 percent water.
- User density is an important factor when designing a wireless network. One reason is the effects of absorption.
- Dense materials such as cinder blocks
Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
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