Computer Knowledge

Unbounded transmission medias

Types, Advantages and Disadvantages of Unbounded Media

Unbounded Media

Transmission media which do not any physical connection between two communicating devices are called Unbounded Media or Unguided Media or Wireless Media. Such type of media uses radio waves, microwaves and satellite. Wireless media such as Infrared, (Unbounded transmission medias) Bluetooth and WIFI (Wireless Fidelity) are also common for short range data transmission.

Radio Wave

A low range electromagnetic wave is called radio frequency. Frequencies below 100MHz are radio frequencies (Unbounded transmission medias) and the above frequencies are microwave. It is suitable for transmitting radio signals around earth surface. Common examples of radio frequencies are AM or FM.

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About of bounded Media


  • It is inexpensive and easy to produce.
  • It covers larger geographical area.


  • The data transfer rate is slower than that in wired media.
  • The quality of data transmission is very poor.

Unbounded transmission medias


High frequency electromagnetic wave (more than 1GHz) is known as microwave. It cannot bend and pass obstacles like hill or building so it requires line of sight transmission. The line of sight due to the earth’s curvature is only 50 kilometers to the horizon. Therefore, the microwave must be placed within the distance. Specially, microwave is used in WAN or MAN communication, satellite communication (Unbounded transmission medias) and telephone communication.


  • It has a high bandwidth than radio wave.
  • The quality of data transmission is better than radio wave.


  • It cannot bend and pass obstacles so required line of straight for data transmission.
  • It does not cover very large space because of earth’s curvature.

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