![]() To prevent interference between different users, the generation and transmission of radio frequency bands is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU). All known transmission systems are operated in the RF spectrum range including analogue radio, aircraft navigation, marine radio, amateur radio, TV broadcasting, mobile networks and satellite systems. RF bands spread in the range between 30 kHz and 300 GHz (alternative point of view offers coverage 3 KHz – 300 GHz). Accordingly, Electromagnetic waves in this frequency range are called radio frequency bands or simply ‘radio waves’. The radio spectrum (also known as radio frequency or RF) is one of such parts of the electromagnetic spectrum that overlaps our sub-THz range at its lower end. The certified spectral range of our sub-terahertz imaging cameras (50 GHz – 0.7 THz) borders with other portions of electromagnetic spectrum, and therefore it makes sense for us to describe briefly the adjacent spans and their peculiarities.
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