Radio communications is regulated by the International Telecommunication Union (ITU) has established a radio regulations in which we read the following definition:
Radio waves or radio waves "electromagnetic waves of frequencies arbitrarily lower than 300 GHz, propagated in space without artificial guide"; they are between 9 kHz and 300 GHz which corresponds to wavelengths of 33 km 1 mm1.
Frequency waves below 9 kHz are radio waves, but are not regulated.
Waves above 300 GHz are classified into the infrared waves as the technology associated with their use is currently optical and not electrical type, though this border is artificial because there is no difference in nature between radio waves , light and other electromagnetic waves waves (eg microwave, radar, etc.).
Many regulations concerning frequency sharing for different uses, some uses or exposure of workers to certain electromagnetic fields, via européenne2 regulations.
