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Mention the difference of the three important methods of radiowave propagation. In which of these three methods, are microwaves transmitted? |
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Answer» SOLUTION :The difference between the three important methods of radio wave propagation is: (i) Propagation through atmosphere: Radiowaves of very low to very HIGH frequency are transmitted through atmosphere as ground waves, sky waves and space waves. But the atmosphere itself can not provied worldwide propagation unless artificial satellites are used. (ii) Propagation through coaxial cables: This method MAY be used only for SHORT-distance propagation. For EXAMPLE, a Local Area Network(LAN) with a few computers, telephone communication within a short region. (iii) Propagation through optical fibres: This is a highly efficient method for worldwide propagation of waves of almost infinite range of frequencies. This method is extremely useful in international communications.Space waves transmitted through the atmosphere and artificial satellites for their effective reflections are used for microwave communications. |
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