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Terahertz (0.1-10 THz) communications are envisioned as a key technology forsixth generation (6G) wireless systems. The study of underlying THz wirelesspropagation channels provides the foundations for the development of reliableTHz communication systems and their applications. This article provides acomprehensive overview of the study of THz wireless channels. First, the threemost popular THz channel measurement methodologies, namely, frequency-domainchannel measurement based on a vector network analyzer (VNA), time-domainchannel measurement based on sliding correlation, and time-domain channelmeasurement based on THz pulses from time-domain spectroscopy (THz-TDS), areintroduced and compared. Current channel measurement systems and measurementcampaigns are reviewed. Then, existing channel modeling methodologies arecategorized into deterministic, stochastic, and hybrid approaches.State-of-the-art THz channel models are analyzed, and the channel simulatorsthat are based on them are introduced. Next, an in-depth review of channelcharacteristics in the THz band is presented. Finally, open problems and futureresearch directions for research studies on THz wireless channels for 6G areelaborated.

Terahertz Wireless Channels: A Holistic Survey on Measurement, Modeling, and Analysis