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Propagation of Electromagnetic Waves
Figure 1: Diffraction of electromagnetic waves
In the radio engineering the free space is used as a transfer channel. This is the earth's atmosphere mainly. The considerations at the wave propagation are made easier by this that the distance between transmitter and receiver is always very large opposite the wavelength of the emitted energy. One can therefore confine himself to the simple relationships of the flat wave fronts in the far-field region.
The knowledge of the factors which influence the propagation of electric magnetic waves is importantly to the understanding of phenomena and measures which appear in the radio traffic.
This are qualities of the wave propagation appearing at different frequencies in the space, in the earth's atmosphere and in other media into dependence of time of day, season and weather influences.
