Is the Terahertz band licensed by the Regulatory Authorities?
At the moment, there are no specific limitations on the use of the THz frequency range for communications purposes. If a workable THz communication system could be realised, then many advantages would accrue from reduced antenna size and greatly increased bandwidth. Experimental systems, operating at a few hundred GHz are now beginning to appear, but a great deal of work still needs to be done to ensure that they are practicable. Specific problems here relate to the attenuation (reduction in strength) of THz radiation as it passes through the atmosphere; and the lack of certain key components, such as amplifiers and modulators for use at THz frequencies.
