For 6G, the terahertz range, frequencies higher than millimetre-wave, such as terahertz and optical range, will be exploited to construct networks that operate at ten times the speed of their 5G counterparts. Frequencies ranging from 100GHz to 10THz are generally regarded as being in the terahertz range. The World Radiocommunication Conference 2019 (WRC-19) set aside a total of 137GHz for telecommunications use among frequencies above 275GHz that had never been allocated previously.
THz Wave Propagation Characteristics, Impact on System Performance, and Comparison With Lower Bands