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   Cheng, Chia-Lin; Kim, Seunghwan; Zajic, Alenka (July 2018, IEEE Proceedings of International Symposium on Antennas and Propagation)
2. Comparison of path loss models for indoor 30 GHz, 140 GHz, and 300 GHz channels

   C.-L. Chang, S. Kim (March 2017, Proceedings of the 11th European Conference on Antennas and Propagation (EuCAP))
3. Complex Permittivities of Ultra-Low-Loss 4H-SiC from 55 GHz to 330 GHz

   https://doi.org/10.1109/ARFTG61196.2024.10660704  

   Yanagimoto, Yoshiyuki; Yanagimoto, Shana; Li, Tianze; Hwang, James_C M (June 2024, IEEE)

   Hexagonal semiconductors such as GaN and SiC have important power applications at radio and millimeter-wave (mmW) frequencies. They are characterized by both ordinary and extraordinary permittivities, parallel and perpendicular to the densest packed c plane, respectively. However, due to the challenges of high-frequency measurements, little reliable data exist for these permittivities especially at mmW frequencies. Recently, for the first time, we reported the extraordinary permittivity of 4H SiC at mmW frequencies using substrateintegrated waveguides. We now report the ordinary permittivity of the same material using several Fabry-Perot resonators to cover most mmW frequencies. The resulted relative ordinary permittivity of 9.76 ± 0.01 exhibits little dispersion and is significantly lower than the previously reported extraordinary permittivity of 10.2 ± 0.1. This confirms that both ordinary and extraordinary permittivities are needed for accurate design and model of devices fabricated on 4H SiC. By contrast, the measured loss tangent increases linearly from 3  10−5 to 1.6  10−4 from 55 GHz to 330 GHz and can be fitted with (4.9 ± 0.1)  10−16 f, where f is the frequency in Hz. In fact, 4H SiC is the lowest-loss solid we have ever measured. The present approaches for permittivity characterization can be extended to other solids. 

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4. Human Motion Sensing Through Blockage and Reflection Measurements at 60 GHz and 300 GHz

   https://doi.org/10.1109/ACCESS.2025.3573681  

   Doeker, Tobias; Eggers, Malte; Reinhardt, Carla E; Mittleman, Daniel M; Kürner, Thomas (January 2025, IEEE Access)
5. Propagation Measurement System and Approach at 140 GHz-Moving to 6G and Above 100 GHz

   https://doi.org/10.1109/GLOCOM.2018.8647921  

   Xing, Yunchou; Rappaport, Theodore S. (December 2018, 2018 IEEE Global Communications Conference (GLOBECOM))

   Abstract: With the relatively recent realization that millimeter wave frequencies are viable for mobile communications, extensive measurements and research have been conducted on frequencies from 0.5 to 100 GHz, and several global wireless standard bodies have proposed channel models for frequencies below 100 GHz. Presently, little is known about the radio channel above 100 GHz where there are much wider unused bandwidth slots available. This paper summarizes wireless communication research and activities above 100 GHz, overviews the results of previously published propagation measurements at D-band (110-170 GHz), provides the design of a 140 GHz wideband channel sounder system, and proposes indoor wideband propagation measurements and penetration measurements for common materials at 140 GHz which were not previously investigated. 

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