What is wireless?
If someone asks why we need wireless communication at all the first answer is �for mobility�. But wireless comes to use for many fixed devices also. Eg. For communicating across a difficult terrain wireless would be a better option than fiber communications.
Wireless communications makes use of two parts of the electromagnetic spectrum namely the radio spectrum and microwave spectrum. Radio waves are easy to generate, can travel long distances and can penetrate buildings and hence are widely used for communication. They are omni-directional and hence avoid the need for carefully aligning the antennas at transmitter and receiver. All radio Broadcast make use of radio waves. Military and police make use of radio frequency for communication.
Microwaves owing to their high frequency travel in straight lines and can be narrowly focused. Hence this has been used for long distance telephone transmission for decades. Since microwaves travel in straight lines if the transmission and reception towers are too far apart the earth would get in between and hence need for repeaters. Microwaves are used in cellular telephones, telephone transmissions, TV distribution and many other fields.
Wireless technology has enabled any device to be moved irrespective of the position of its peripherals. Bluetooth, wireless LAN, wireless internet are all developments in this area. Now no more is a network clubbed up in a room or even the same building. A person even a mile away can access the network thanks to wireless technology.
Want to know more? Check these out....acknowledgements
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