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UnGuided Media and its Types in Computer Network

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Unguided Media and its Types in Computer Network

Unguided Media and its types in Computer Network transmission are one media types in which data is travel using no physical medium, Unlike the Bounded media in which data is travel through physical media. Unguided media is also called Wireless Media Transmission.

The Unguided Media uses an antenna and Electronomegnetive Waves. The antenna is used for transmitting the signal(Electromagnetic Wave. Before going to the classification of unguided transmission media we discuss antenna and electromagnetic waves.

Guided Media in Computer Network

Electromagnetic Wave.

These waves are elecrons that propagates informatation from one location to another location.


The antenna is an electronic conductor device that has the ability to transmit electromagnetic waves and receive these signals.

The Unguided Media propagates the signals from source to Destination in three methods.

1. Ground Wave Propagation.

The electromagnetic wave is propagated close to the atmosphere i.e. between the ionosphere and earth surface.

2. Sky Wave Propagation.

The electromagnetic wave has a higher frequency is radiated up in the ionosphere from the source antenna which gets reflected back to the earth’s surface. 

3.Line of Sight Transmission.

The electromagnetic wave which has a higher frequency is transmitted in the ‘straight-line direction from the source to the destination station.

Types of Un-Bounded (Un-Guided Media)

  1. Radio Transmission.
  2. Microwave Transmission.
  3. Infrared Transmission.

Radio Wave Transmission .

The radio waves are low-frequency electromagnetic waves ranging from ‘3 kHz to 1GHz’.This wave can penetrate walls and you can receive signals even if you are inside the building. The radio waves are propagated in sky wave mode. In this Radio wave transmission, the source antenna and receiving antenna are not required to be aligned in the same direction.

2. Microwave Transmission :-

The microwave transmission is the electromagnetic waves with a frequency range from ‘1 to 300 GHz’. The microwaves are basically unidirectional in nature and due to which it propagates in line-of-sight mode.

The microwave transmission can be classified into two types of Mode.

1. Terrestrial Microwave Transmission

In terrestrial Mode of Transmission the transmitting and receiving antenna both are fixed on the ground and the data is transmitted using the line of sight propagation mode.It is widely used in telecommunication.

2. Satellite Microwave Transmission

In satellite Transmission mode the electromagnetic wave is transmitted by the source antenna (earth) which is received by the satellite which amplifies the data i.e. signal and rebroadcast it to the receiver antenna (earth).

Infrared Transmission Mode.

Infrared wave is the high-frequency wave ranging from ‘300 GHz to 400 THz’. The infrared transmission mode is line-of-sight transmission which is used by short distance transmission. Infrared waves have high frequency waves and they cannot pennate the wall. This wave has no chance of interference because we can easily differentiate between inside and outside communication in a building.

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