Comparative Analysis of Pathloss at 28 GHz and 140 GHz Frequencies in Identical Environment

To meet the high data rate demands of 5 th generation mobile communication (5G), the millimeter-wave (mmWave) frequency band is crucial for securing extensive bandwidth. As cellular systems evolve toward 6th generation mobile communication (6G), the sub-terahertz (sub-THz) frequency band has received growing research attention, and comparative studies of the two aforementioned bands are underway. However, a significant frequency band gap between the two bands and absence of a third generation partnership project reference model present challenges in their direct comparison. These issues can be addressed by comparing their one-to-one mapped data when conditions are identical in both bands. To this end, we conducted a comparative analysis of the propagation characteristics of mmWave 28 GHz and sub-THz 140 GHz bands under identical conditions. This analysis encompassed multi-path phenomena, indoor and outdoor pathlosses, outdoor-to-indoor pathloss, as well as penetration losses, including those related to human body and glass. Experimental results show that line of sight and non-line of sight at the sub-THz band have sparse multi-path characteristics and experience much higher loss than the mmWave band. This study provides valuable insights into predicting performance when sub-THz equipment is installed near existing mmWave equipment.