ITU frequency bands
The International Telecommunications Union has defined a system of terminology for electromagnetic frequencies used for radio and radar. While it is probably the most user-friendly of the three major systems in use, its categories are too coarsely grained for describing radar uses. It is, however, a good set of terms for frequencies used in communications.
The very lowest bands have no radar applications, but, among other things, have a critical military application in communicating, at a very low data rate, with submerged submarines.
|Frequency range||ITU band|
|3-30 Hz||ELF (Extremely Low Frequency)|
|30Hz to 300Hz||SLF (Super Low Frequency)|
|300Hz to 3000Hz||ULF (Ultra Low Frequency)|
|3kHz to 30kHz||VLF (Very Low Frequency)|
|30-300 KHz||LF (Low Frequency; "longwave")|
|300KHz-3 MHz||MF (Medium Frequency; "medium wave")|
|3-30 MHz||HF (High Frequency; "shortwave")|
|30-300 MHz||VHF (Very High Frequency)|
|300 MHz -3 GHz||UHF (Ultra High Frequency)|
|3-30 GHz||SHF (Super High Frequency)|
|30-300 GHz||EHF (Extremely High Frequency)|