Friday, 6 December 2013

The radio waves are omnidirectional. While the microwaves are directional. Radio waves are used for one sender and multiple receivers i.e. for multicusting property. Because of this multicast communication, it is used by radio, television, cordless phones and pagers. Radio waves is a general term to encompass frequencies in the range 3 KHz to 1 GHz. The microwaves ranges in frequencies between 1 to 300 GHz. Broadcast radio term may be informally used for the FM radio and VHF television and number of data networking applications.
As the radio waves are omnidirectional, they do not require dish-shaped antennas with precise alignment. Radio waves used omnidirectional antennas that send the signals in all directions. We can  have different types of antennas based on wavelength and strength. Radio waves can penetrate walls. It can be considered as an advantage e.g. AM radio can receive signals inside the building. It has the disadvantage that radio waves band is relatively narrow and if we subdivide it ferther, it becomes narrower resulting in lower data rate for digital communications. Another problem with the radio waves are multipath interference. Reflection from different sources can create multiple paths between antennas which is evident when TV receiption displays multiple images. But because of longer wavelength, radio waves suffer less attenuation.

Radio waves band is regulated by authorities like FCC in United States
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