You are going to read about Unguided media in this blog we cover all these topics-Radio transmissions, Microwave transmission.
Unguided media is also known as wireless communication. It does not require any physical medium to transmit any electromagnetic signals.
Medium media transmits electromagnetic signals through the air to all. These signals are available to anyone who has a device capable of receiving those signals.
- Signals go from transmitter to beneficiary by means of a way. this path called the media can be guided media or unguided media.
- A guided media is contained within physical boundaries, while an unguided media is boundless.
It is also known as unbounded media and does not have any specific limits. All this allows the user to stay connected at all times.
Because the communication done by it is wireless, due to which the user can connect himself anywhere on the network. It is also classified into three radio waves, microwave, and infrared waves.
Radiofrequency transmission- Unguided media
Radiofrequency transmission is a form of electromagnetic transmission that is used in wireless communication.
RF signals can be easily generated, often in the range of 3kHz to 300GHz.
They are used in wireless communication because their special feature is that they can easily penetrate into objects and together they can travel long distances as well.
Radio communication depends on some parameters which are wavelength, transmitter power, receiver quality, type, size iN antenna height.
- these are frequency-dependent.
- They have relatively low bandwidth for data transmission.
The frequency of Infrared waves is about 300 GHz to 430 THz, which may be used for short-range communication.
Infrared waves of high frequencies cannot penetrate walls. This characteristic of Infrared waves prevents interference between one system and another.
This means a short-range communication system in a room cannot be affected by another system in the adjacent room.
If we are using the infrared remote control, we do not interfere with the use of the remote by our neighbors.
However, by this characteristic infrared signals become useless for long-range communication.
Also, we cannot use infrared waves outside a building because the sun’s rays contain infrared waves that can interfere with communication
Characteristics of infrared waves
- This sort of wide bandwidth is often wont to transmit digital data at a really high rate. The Infrared Data Association (IrDA) has established standards for using these signals for communication between devices like keyboards, mice, PCs, and printers, and it’s also liable for sponsoring the utilization of infrared waves.
- This type of communication provides better security with minimum interference.
Microwave Transmission Microwaves are a form of electromagnetic transmission that is used in wireless communication systems.
The microwave wavelength falls from one meter to one millimeter. The frequency varies from 300MHz to 300GHz.
They are mainly used for long-distance communications and are much less expensive.
- propagation is a line of sight
- repeaters are needed for long-distance communication
- very high-frequency microwave cannot penetrate walls
The microwave consists of two types.
- Terrestrial microwave.
- satellite microwave
- They cannot pass through microwave buildings.
- Bad weather has an effect on signal transmission. 3. They are frequency dependent.
- Terrestrial microwave transmissions are sent between two microwave stations on the earth (earth station).
- It is the most common form of long-distance communication.
- Terrestrial microwave systems operate in the low gigahertz range.
- Use a parabolic dish to focus a narrow beam onto a receiver antenna.
- fewer repeater but requires a line of sight transmission.
- higher frequencies give a higher data rate.
- the main source of loss in attenuation caused mostly by distance, rainfall, and interference.
- A communication satellite is a microwave relay station
- used to link two or more ground station
- receives on one frequency (uplink), amplifies, or repeats signal and transmits on another frequency (downlink).
- The optimum frequency range for satellite transmission is 1 to 10 GHz.
- satellites use a frequency bandwidth range of 5.925 to 6.425 GHz from earth to the satellite (uplink) and a range of 3.7 to 4.2 GHz from satellite to earth (downlink).
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Also Read: Guided Media in Computer Network