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An excellent way to think of antennas is to consider the analogy of a water hose and a nozzle The hose is the coaxial cable carrying the RF energy from a transmitter to the antenna Just as the hose contains the water, the coaxial cable contains the RF energy until it reaches its destination The nozzle is the antenna; it sprays the RF energy into the air much as the water hose nozzle sprays the water into the air Just as different nozzles create different spray patterns, different antennas have different RF propagation patterns This way, you can use a standard transmitter (for example, an access point) and propagate the RF energy differently in a range of places by using various types of antennas Some antennas propagate the energy relatively the same in all directions, and others propagate most of the energy in a narrow path in one direction Select the antenna that creates the appropriate propagation pattern to meet your needs
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Most antennas are compared to a mythical antenna known as an isotropic radiator I call it a mythical antenna because humans cannot create one The isotropic radiator is an antenna that propagates RF energy in all directions in a completely equal spherical pattern With this type of antenna, the RF energy is propagated up, down, side-to-side, and in all other directions with the exact same energy As you recall from 2, dBi measures the gain of an antenna The i stands for isotropic and is used to compare the actual gain in the advertised direction of the antenna If an antenna is an omnidirectional antenna with a high gain (12 to 15 dBi), then the donut-shaped propagation pattern is flatter In other words, less of the RF energy travels in an upward direction and more of the RF energy travels in an outward direction The longer or taller an omnidirectional antenna, the flatter the RF propagation pattern This means, in the inverse, that the shorter the antenna, the more spherical the propagation pattern, so to create a perfect sphere, the antenna would have a length of zero, which means, of course, that the antenna does not exist Am I the only one who fears saying that something cannot be done After all, people once said that objects heavier than air could not fly, and that if you floated too far in a boat, you would fall off the end of the Earth I feel safe in saying that with the current technology and information available, it is impossible to create an isotropic antenna So when someone reads this book in 1000 years (over a wireless network using a true isotropic radiator at 100 exabits per second, or more), I won t look too foolish
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You do not have to be a physics expert to implement and support wireless LANs That is the good news However, you should know enough about the concept of polarization to determine proper antenna placement Polarization references the physical orientation of the antenna in relation to the Earth Understanding the impact of horizontal versus vertical polarization is important Simply put, when omnidirectional antennas are in a vertical position, the RF waves are propagated horizontally When the antennas are placed in a horizontal position, the RF waves are propagated vertically Here is the catch: vertically polarized antennas are in a vertical position and horizontally polarized antennas are in a horizontal position In other words, the polarization of an antenna is not referred to by the propagation of the wave, but by the position of the electric field, in the wave, to the ground The electric portion of an electromagnetic wave is propagated parallel to the propagation device If the antenna is vertical, the electric wave is vertical Now you know where the term vertically polarized comes from; it references the polarization of the electric field in relation to the Earth Even though the waves propagate horizontally when an omnidirectional antenna is vertical, the antenna is said to be vertically polarized The easiest way to remember this is that polarization refers to the position of the antenna I don t want to leave the impression that absolute vertical and horizontal polarization are the only options If you have worked with any AP-attached antennas, you know they can be positioned at many angles The vertical and horizontal planes simply provide an easy way to think of antenna propagation behavior In fact, it is not uncommon to position an antenna in a way that might be called angled polarization This positioning allows the RF waves to propagate to multiple floors in a building and is often seen in hotel hotspot installations The most important thing to remember about polarization is that the sending and receiving antennas should be positioned using the same polarization Configuring the antennas with different polarizations causes a reduction in signal strength at the receiver and can impact throughput greatly For example, if you place one antenna close to the ground and another 100 feet away and 30 feet higher, you have to angle the antennas so that they are parallel to each other to achieve the best signal reception
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