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When signal strength is weakened, we refer to it as loss Loss is a decrease in the amplitude of the signal Signal loss can occur within the cabling of the wireless
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The preceding section mentioned the term beamwidth The beamwidth of an antenna is defined as a measurement from the center of the RF signal to the points on the vertical and horizontal axes where the signal strength decreases by three decibels, or half power To help you understand this, consider the analogy of a flashlight beam You may have used flashlights with adjustable beams These flashlights usually allow you to turn a dial and focus the beam to become broader or narrower If you shine the light on a wall, you will see a very bright center beam surrounded by ever-dimming rings of light As you make adjustments to the beam, the circles of light stretch outward and inward This behavior is similar to the concept of beamwidths Of course, different antennas offer different beamwidths Omnidirectional antennas radiate signals out in all directions around the antenna very evenly and they radiate these signals in a fairly high vertical swath as well In fact an omnidirectional antenna will usually have a beamwidth of somewhere around 50 to 60 degrees A parabolic dish or grid antenna (both of which look similar to a satellite dish) may have a beamwidth as low as 4 degrees and rarely higher than 20 degrees Do you see the difference The antenna that focuses the energy more is used in long-distance links (the parabolic dish) and the antenna that focuses the energy less is used for indoor and area coverage WLANs (omnidirectional) This understanding of beamwidths will help you on the CWTS exam, but it will also help you as you select the appropriate antennas for a given installation scenario
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devices and infrastructure and when the antenna sends the signal through the air as RF waves Cables and connectors can cause loss because of the resistance they impose When this loss occurs in the cabling and connectors, the temperature of the cables will usually increase The AC electrical signal is absorbed as it travels on the wire (the signal travels the wire as an AC electrical signal and is converted to an RF wave by the antenna) because of resistance If the impedance of the cables and connectors does not match, you have an impedance mismatch that causes power to be reflected back toward the source Less energy can be transmitted forward, as some has been reflected backward, and this
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creates a loss in signal amplitude In worst-case scenarios, this reflection can even damage equipment As the RF wave travels through the environment, through walls, through humans (yes, they pass right through you) and animals, and even through the air, some of its energy will be lost because of absorption and other RF behaviors The most damaging environmental objects are generally those with high moisture levels water is an excellent absorbent of RF energy Loss can also occur intentionally Because the FCC regulates the power output of RF signals from your antenna, you may need to reduce the signal strength intentionally before it leaves the antenna Signal strength is reduced before radiation using an RF attenuator Because receivers have a sensitivity threshold, you must account for gains and losses A signal leaving an antenna without the needed strength demanded by the receiver, the distance, and the environment will not reach its intended destination with sufficient signal strength
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RF Behavior
After RF waves leave the antenna and begin to travel through the environment in which communications must occur, many behavioral factors influence the results achieved Understanding the behavior of RF waves is essential to configuring a working wireless network in small or large environments Most of these behaviors will be easy for you to understand, as they are similar to what you have learned through experience with light Remembering that light is part of the electromagnetic spectrum and has a similar behavior to RF will help you understand these behaviors
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