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Radio communication

This document discusses the history and mechanisms of radio communication. It describes how Maxwell and Hertz proved in the 1870s-1880s that electromagnetic waves could transmit signals through space. The first radio transmission was by Marconi in 1901. Radio uses a transmitter and receiver with antennas to send and receive signals by inducing alternating currents. Advantages are low-cost long-distance communication without wires, while disadvantages include low data rates and inability to transmit video. Future technologies like cognitive radio can dynamically switch frequencies to avoid interference.

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Presented By 1. Ahmed , Muhammad Jubaer ( ID:13-23022-1) 2. Sabuj , Arifur Rahman (ID: 12-21235-2) BSc. In EEE Faculty: A.H.M Shatil
Introduction Radio is the radiation of electromagnetic signals through the atmosphere or free space. Information, such as sound, is carried by systematically changing some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.
History In 1873 James Clerk Maxwell showed mathematically that electromagnetic waves could propagate through free space. The first intentional transmission of a signal by means of electromagnetic waves was performed in an experiment by David Edward Hughes around 1880. In 1888 Heinrich Rudolf Hertz was able to prove transmitted airborne electromagnetic waves in an experiment confirming Maxwell's theory of electromagnetism.
History In 1892 the physicist William Crookes wrote on the possibilities of wireless telegraphy based on Hertzian waves and in 1893 Tesla proposed a system for transmitting intelligence and wireless power using the earth as the medium. In 1901, Marconi conducted the first successful experimental radio communications. And In 1907, the first commercial radio communications service was established.
MARCONI RADIO APPARATUS
Mechanism The radio equipment involved in communication systems includes a transmitter and a receiver, each having an antenna and appropriate terminal equipment such as a microphone at the transmitter and a loudspeaker at the receiver in the case of a voice-communication system.
Mechanism
Advantages  It’s able to bounce of the ionosphere so it could travel around the world.  It’s also a cheap form of communication and it travels through the air so no wires are needed.  Radio communication can be possible where any satellite and cell phone service are not available.
Disadvantages  It has low frequency so it can't transmit a lot of data one time.  In this communication system we can’t transfer video or picture only voice signal can be transferred.
Future Technology for Radio Communication Cognitive Radio Networks  Cognitive radios have the ability to instantly find other spectrum if interference is detected on the frequencies being used.  Cognitive radios have the ability to monitor, sense, and detect the conditions of their operating environment, and dynamically reconfigure their own characteristics to best match those conditions.
Conclusion The radio communications has been used over a hundred years now. The uses of radio communication increasing day by day & its being used by a wide range of electronic sector. This technology is upgrading to give us better satisfaction.
Reference  www.en.wikipedia.org/wiki/Radio  www.ehow.com/list_6834532_radio-communication-its- uses.html  www.radio-electronic.com  www.papercamp.com/essay/40210/Advantages-And- Disadvantageses-Of-Radio  www.xgtechnology.com/technology/cognitive-radio-networks/
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