Tremendously high frequency
Tremendously high frequency (THF) is a band designation used by some authors to refer to a decade band in the submillimeter radiation/terahertz radiation range. It follows the ITU EHF band in increasing frequency order.[dubious ]
THF runs the range of frequencies from 300 gigahertz to 3 terahertz, laying in the low (or far) infrared range of the electromagnetic spectrum. The wavelength in this band varies from one to one tenth of a millimetre.
Amateur Radio Service operators make experiments around 322 GHz, 403 GHz and 411 GHz.
See also 
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