6G THz-Band Facing Propagation and Atmospheric Absorption Losses

More enhancements for the 5G mobile system are still in progress. At the same time, 6G system research millstones have already been started by academics and industries. It is expected that 6G systems will be introduced in 2030. It is expected that smart services based on internet of everything (IoE) will be supported by an intelligent wireless system represented by an artificial intelligent (AI) based 6G mobile system. 6G system structure, will be a virtual reality (VR), augmented reality (AR), extended reality (XR), and holographic communication application based. The 6G mobile system will be integrate the terrestrial, space, and under-sea communications into a global network to provide services over isolated or uncovered area beside the actual terrestrial cellular network. 6G will work at the THz band, starting from 0.1THZ to 10 THz, supporting Tbps-level data rate, ��-level latency, and connection density of ��� per ��� . Atmospheric absorption loss and free space path loss (FSPL) are two of the biggest challenges for the adoption of the terahertz band in the future. In this paper, the sub-terahertz band general characteristics was investigated. The FSPL, the atmospheric absorption loss, and rain attenuation are also evaluated.