Crane, Robert K. Departments of Electrical Engineering and Meteorology, University of Oklahoma, Norman, Oklahoma.
Last reviewed:March 2021
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The means by which radio waves move from one place to another. A radio wave is an electromagnetic wave that has a frequency within the radio-frequency spectrum, from 3 kHz (3000 Hz, where Hz is the symbol for hertz, a unit of frequency defined as cycles per second) to 3000 GHz (3,000,000,000,000 Hz). The Radio Regulations set by the International Telecommunications Union (ITU) identify nine radio-frequency bands in the radio spectrum starting at 3 kHz and extending to 3000 GHz (see table). Each band spans a factor of 10 in frequency; for example, the very-low-frequency band (VLF) is from 3 to 30 kHz and the superhigh-frequency band (SHF) is from 3 to 30 GHz. The bands are designated as VLF, LF, MF, HF, VHF, UHF, SHF, EHF, and infrared. See also: Electromagnetic radiation; Frequency (wave motion)
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