Reflection The
effect of an RF signal meeting a dense, reflective material, such that it is
sent in a different direction
Reflection
If an RF signal traveling as a wave meets a dense reflective
material, the signal can be reflected just like a light wave is reflected off
of certain surfaces. In a wireless LAN scenario, the wave will reflect off metal
surfaces such as filing cabinets etc or off windows. There would also be some
level of reflection from walls and in outdoor deployment from the earth,
buildings and water.
The reflection is a copy of the signal and if it is received
along with the original signal (straight path) then it is likely to be out of
phase. This causes the net received signal to be less. This is known as
multipath. Prior to 802.11n, multipath was always detrimental. In 802.11n/ac,
multipath has been harnessed to improve the performance of the transmission/reception
train.
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