Electro magnetic radiation is an energy moves in the surface as a wave of electronic and magnetic fields. The most famous example of electromagnetic radiation is the light through which we see. The two main magnitudes of the wave are: the frequency in Hz units (Hertz), or MHz units (Mega Hertz-million Hertz) and GHz Giga Hertz (billion Hertz). One Hertz is one movement per second.
The wave power, or the power density of the wave, is measured in units of milli-watt per square centimeter (mW/cms) or watt per square meter (W/ms). Electromagnetic radiation, with typical frequency of 100kHz-300GHz is called “radio radiation”.
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