ITU frequency bands: Difference between revisions

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imported>Howard C. Berkowitz
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|-
|-
| 3-30 Hz
| 3-30 Hz
| ELF
| ELF (Extremely Low Frequency)
|-
|-
| 30Hz to 300Hz
| 30Hz to 300Hz
| SLF
| SLF (Super Low Frequency)
|-
|-
| 300Hz to 3000Hz
| 300Hz to 3000Hz
| ULF
| ULF (Ultra Low Frequency)
|-
|-
| 3kHz to 30kHz
| 3kHz to 30kHz
| VLF
| VLF (Very Low Frequency)
|-
|-
| 30-300 KHz
| 30-300 KHz
| LF
| LF (Low Frequency; "[[longwave]]")
|-
|-
| 300KHz-3 MHz
| 300KHz-3 MHz
| MF
| MF (Medium Frequency; "[[medium wave]]")
|-
|-
| 3-30 MHz
| 3-30 MHz
| HF
| HF (High Frequency; "[[shortwave]]")
|-
|-
| 30-300 MHz
| 30-300 MHz
| VHF
| VHF (Very High Frequency)
|-
|-
| 300 MHz -3 GHz
| 300 MHz -3 GHz
| UHF
| UHF (Ultra High Frequency)
|-
|-
| 3-30 GHz
| 3-30 GHz
| SHF
| SHF (Super High Frequency)
|-
|-
| 30-300 GHz
| 30-300 GHz
| EHF, "millimeter wave"
| EHF (Extremely High Frequency)
|}
|}
Millimeter wave frequencies begin at 18 GHz in SHF and go to the lower third of EHF. Submillimeter wave start roughly above 100 GHz; they [[blur]] into the longer [[infrared light]] frequencies.[[Category:Suggestion Bot Tag]]

Latest revision as of 17:01, 30 August 2024

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This editable Main Article is under development and subject to a disclaimer.

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.

See IEEE frequency bands for radar designations used widely in civilian practice, and the EU-NATO-US frequency bands for a nomenclature that works well in fine-grained radar band discussion.

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)

Millimeter wave frequencies begin at 18 GHz in SHF and go to the lower third of EHF. Submillimeter wave start roughly above 100 GHz; they blur into the longer infrared light frequencies.