Unguided media transport electromagnetic waves without using a physical conductor. This type of communication is often referred to as wireless communication.

Types Of Unguided Media:Radio Waves,Microwaves,Infrared

Radio waves are used for multicast communications, such as radio and television, and paging systems. They can penetrate through walls. Highly regulated. Use omni directional antennas

Electro magnetic waves having frequencies between 1 to 300 Ghz is called as Microwaves.Microwaves are used for unicast communication such as cellular telephones, satellite networks,and wireless LANs. Higher frequency ranges cannot penetrate walls.Use directional antennas -point to point line of sight communications.

Infrared waves with the frquencies from 300 Ghz to 400 Thz.Infrared signals can be used for short-range communication in a closed area using line-of-sight propagation. Infrared waves having high frequences and they cannot penetrate through walls.Infrared signal defined by IrDA transmit through the line of sight.