With the advancement of terahertz technology, there is growing anticipation for 6G communication in the international community, and terahertz communication is gaining increasing attention. Nonetheless, terahertz waves possess strong directionality, leading to the obstruction of transmission signals. Consequently, achieving largeangle, directed transmission poses a technical obstacle for terahertz communication. Metasurfaces technology has great potential to improve the coverage performance of 6G networks, making it one of the most promising technologies in this field. This paper designed a terahertz directional reflector that is insensitive to polarization in the terahertz communication band (0.25 THz). The unit structure is selected using the resonant phase modulation principle, utilizing a metal-insulator-metal structure. Following the phase compensation principle, the structure of the unit is arranged and simulation experiments are conducted to achieve a 30-degree abnormal deflection of the reflected beam. This scheme will hold some application value for terahertz 6G channel control in future research.
Recently, research on 6G wireless communication technology has become a hot topic. In 6G technology, terahertz communication is considered the most promising part. The research and application of the terahertz communication frequency range (0.1-10 THz) will bring revolutionary changes to the field of communication. It has the potential to bridge the transmission gap between the infrared and microwave bands, and offers highspeed data transmission, low latency, and high-capacity communication. Therefore, the development of terahertz communication is highly anticipated as a significant driving force for 6G technology. At present, research on outdoor terahertz channels is far less extensive compared to indoor channels, requiring more efforts to explore the characteristics of outdoor terahertz channels. In this paper, we focus on the three-dimensional scenario of street canyon and model the terahertz channel using ray tracing. The carrier frequencies used for simulation range from 220 to 330 GHz. By calculating the power loss and required time for each path from the transmitter to the receiver, we obtain parameters such as power delay spectrum and power angle spectrum. Next, we analyze the relationships between path loss, delay spread, angle spread, and distance, gaining further understanding of the outdoor terahertz multipath channel characteristics.
6G wireless communication technology is expected to provide a higher peak data rate, lower latency, high mobile speed, high spectral efficiency, and high network energy efficiency in the future. It has the advantages of wide coverage, high security, and low-cost efficiency. As one of the candidate frequency bands of 6G technology, THz wave (0.1-10 THz) bridges the infrared band and the microwave band and has a very important application prospect in the communication process. Due to the terahertz source power and the absorption of various particles in the air, indoor short-range terahertz wireless communication has practical research value. In this paper, for the three-dimensional scene of common indoor conference rooms, the ray tracing method is used to model the terahertz channel of the line-of-sight (LOS) path, the primary reflection path, and the secondary reflection path. The carrier frequency range used for the simulation is 220-330 GHz. By calculating the power loss and required time of each path from the transmitter to the receiver, parameters such as the power delay profile are obtained. Then, the related terahertz channel parameters such as Rician K-factor and root mean square (RMS) delay spread are analyzed.
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