2 DF Principles
2.1 Generation and characteristics of electromagnetic waves
Electromagnetic waves are caused by charging and discharging processes on electrical conductors in the form of AC currents [7], [8]. The first assumption is based on an undisturbed propagation of a harmonic wave of the wavelength ë . At a sufficiently large distance the radial field components are largely decayed so that limited to a small area the wave can be considered to be plane:
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