Microwaves are high-frequency electromagnetic waves in the same frequency band as radar waves. Only 4 microwave frequencies are permitted for industrial and scientific use. Of these, 2.45 GHz is the most frequently used.
Electromagnetic waves are interconnected electric and magnetic fields which change over time and propagate at the speed of light through space. The electromagnetic field produced is described by the field strength vectors E and B.
E...electric field B...magnetic field c...speed of propagation λ...wavelength
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