Unguided Transmission Media
what is unguided Transmission Media?
They are also known as wireless or unbounded media and help transmit electromagnetic signals without the use of a physical medium. Here, air is the media. There is no physical connection between the transmitter and receiver. These transmission medium are less secure than directed media despite being utilized over longer distances. The following are the three main types of wireless transmission media.
What are the advantages and disadvantages of unguided transmission media?
Advantages:
- Simple setup because there is no need for wiring between individual nodes.
- The service is portable since nodes are easily transportable from one location to another.
- By simply swapping credentials, new nodes can be connected.
Disadvantages:
- Due to the vulnerability of signals, data security is at risk.
- Weather conditions may have an impact on data transmission.
- When there are numerous wireless signals, there is signal interference.
Type of Unguided Media:
- Radio Wave
- Microwave
- Infrared
_Radio Waves_
Electromagnetic waves with frequencies between 3 kHz and 1 GHz are commonly referred to as radio waves, and those with frequencies between 1 and 300 GHz are referred to as microwaves, even though there isn't a clear cut boundary that separates the two. However, the behavior of the waves, as opposed to their frequency, is a stronger classification criterion. Radio waves are often omnidirectional. When a radio transmitter uses an antenna, radio waves are sent out in all directions. The sending and receiving antennas do not need to be in alignment as a result. The waves that a sending antenna emits can be picked up by any receiving antenna. The omnidirectional property also has a disadvantage.
Radio waves from one antenna that use the same frequency or band as another antenna's radio transmissions can interfere with them. Radio waves, particularly those that propagate in the sky mode, have a long range. As a result, radio waves, such as AM radio, are a great choice for long-distance broadcasting (AM radio ranges from 535 to 1705 kHz). Radio waves, particularly those with low and medium frequencies, can pass through walls. This characteristic has the potential to be both advantageous and detrimental. Because an AM radio, for instance, might pick up signals within a building, it is useful. This is a disadvantage because we are unable to restrict communication to just the interior or exterior of a structure. Radio spectrum is smaller than the microwave band. The radio wave band is small—just under 1 GHz—in comparison to the microwave band.
A high-frequency wave that falls between "300 GHz and 400 THz" is infrared. Line-of-sight propagation is employed in the infrared transmission, which is used for short-distance communication. Since infrared transmission uses high-frequency waves, which cannot pass through walls, you can clearly distinguish between communication occurring inside and outside of a building. There are no dangers of intervention in this method. The remote control used to run AC, television, and music systems is the most common instance of infrared transmission media. the frequency of the electromagnetic wave rises and we travel from the radio wave toward the visible light, the electromagnetic wave acts more like light. The television receives infrared waves that are emitted by the remote control.
Infrared waves are more secure when it comes to security
because there is no possibility of eavesdropping as the infrared wave does not
even penetrate the wall. Therefore, using infrared transmission does not even
need a license. these types of
transmission media are unguided. Additionally, we now understand the modes of
propagation that allow electromagnetic waves to go from source to destination.
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