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Electromagnetic Spectrum used in communication technologies
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Analyse information to identify the electromagnetic spectrum range utilised in modern communication technologies.
The production and detection of electromagnetic waves at frequencies other than the visible range has produced a communications revolution. An image of the electromagnetic spectrum is shown on the right. The parts of the electromagnetic spectrum that we use for communication include radio waves, microwaves, infra-red, visible light and ultraviolet. Radio waves Radio waves have the longest wavelengths and are used extensively for communication. Short wavelengths ranging from 30cm ”V 3m are used for mobile phones. Long and medium wavelength radio waves can diffract around large obstacles, so they can be received even when there is no direct ”„line of sight”¦ between the transmitter and the receiver. Hence, medium wavelengths ranging from 3m-100m are used in FM radio and television transmission and long wavelength radio waves ranging from 100m-500m are used for AM radio. Microwaves Microwaves have wavelengths ranging from 1 millimetre to 30 centimetres. The modulation of microwaves enables them to transfer information. The main disadvantage of microwaves is that they require a line of sight connection from one antenna to the next. Mobile phones use microwaves for their transfer of energy and information. Interference can easily occur if there is something in the line of sight making microwave signals less reliable. With phone signals on frequencies arou...
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