Results 1 to 10 of about 328,962 (374)
Near-Field Channel Estimation for Extremely Large-Scale Reconfigurable Intelligent Surface (XL-RIS)-Aided Wideband mmWave Systems [PDF]
IEEE Journal on Selected Areas in Communications, 2023 Near-field communications present new opportunities over near-field channels, however, the spherical wavefront propagation makes near-field signal processing challenging.
Songjie Yang +5 more
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Near-Field Rainbow: Wideband Beam Training for XL-MIMO [PDF]
IEEE Transactions on Wireless Communications, 2022 Wideband extremely large-scale multiple-input-multiple-output (XL-MIMO) plays an important role in boosting the data rate for 6G networks. Because of the huge bandwidth and the large number of antennas, wideband XL-MIMO introduces a significant near ...
Mingyao Cui +4 more
semanticscholar +1 more source
Beamfocusing Optimization for Near-Field Wideband Multi-User Communications [PDF]
IEEE Transactions on Communications, 2023 A near-field wideband communication system is investigated in which a base station (BS) employs an extra-large scale antenna array (ELAA) to serve multiple users in its near-field region.
Zhao-Jie Wang, Xidong Mu, Yuanwei Liu
semanticscholar +1 more source
Delay-Phase Precoding for Wideband THz Massive MIMO [PDF]
IEEE Transactions on Wireless Communications, 2021 Benefiting from tens of GHz of bandwidth, terahertz (THz) communication has become a promising technology for future 6G network. To deal with the serious propagation loss of THz signals, massive multiple-input multiple-output (MIMO) with hybrid precoding
L. Dai, Jingbo Tan, Zhi Chen, H. Poor
semanticscholar +1 more source
Crystals, 2023 A frequency magnetically tunable perfect absorber based on graphene in the terahertz (THz) region is proposed. The performance is analysed using the 4 × 4 transfer matrix method, demonstrating that the perfect absorption frequency of the proposed ...
Zhenyan Wei, Yannan Jiang, Jiao Wang
doaj +1 more source
High Absorptivity and Ultra-Wideband Solar Absorber Based on Ti-Al2O3 Cross Elliptical Disk Arrays
Coatings, 2023 Perfect metamaterial absorbers have attracted researchers’ attention in solar energy harvesting and utilization. An ideal solar absorber should provide high absorption, be ultra-wideband, and be insensitive to polarization and incident angles, which ...
Yuanjian Zhang +7 more
semanticscholar +1 more source
Coplanar Discontinuous Transmission Line Feed for Phase Gradient Metasurface Antenna
International Journal of Antennas and Propagation, 2022 The aim of this study is to efficiently excite the radiation of phase gradient metasurface (PGM), a novel coplanar discontinuous transmission line feed is proposed for reduction of the profile, where 12 uniform discontinuous rectangular rings form the ...
Yiying Wang +6 more
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Near-Field Wideband Extremely Large-Scale MIMO Transmissions With Holographic Metasurface-Based Antenna Arrays [PDF]
IEEE Transactions on Wireless Communications, 2022 Extremely large-scale multiple-input multiple-output (XL-MIMO) constitutes the design trend for base stations of future wireless communication systems, being capable of offering pencil-like beamforming that confronts path loss in an energy-efficient ...
Jie Xu +5 more
semanticscholar +1 more source
Tunable plasmon induced transparency with high transmittance in a two-layer graphene structure
Results in Physics, 2021 A dynamically tunable plasmon induced transparency planar structure with double layers hollow-cross graphene array is proposed in this paper. Due to energy oscillating back and forth between two weak hybridized states made up of upper and lower graphene,
Shuquan Zheng +3 more
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Nano-Micro Letters, 2022 Constructing a porous carbon fiber/polymethacrylimide (CP) structure for acquiring promising electromagnetic absorption performance and withstanding both elevated temperature and high strength in a low density.
Zibao Jiao +9 more
semanticscholar +1 more source