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在第68期前沿文献推荐中，介绍了新型网络架构以及超材料在未来通信中的应用，包括：用于5G无线系统的芯片级Floquet拓扑绝缘体；一种适用于5G-MIMO通信系统的新型高隔离度天线阵；用于改善单极子天线增益的基于间隙耦合对称分裂环谐振器的近零折射率负介电常数超材料；内生智能和端到端服务化的6G无线网络架构设计。在本期的文献推荐中，关注点着眼于未来网络中使用的新材料以及相关技术，选取了：100GHz以上有源和无源用户之间的动态频谱共享；用于6G通信系统的单层二硫化钼开关；使用轨道角动量复用的太赫兹无线链路中接收器孔径和多径对功率损耗和模式串扰的影响；用于5G应用的具有任意输出的紧凑型功率分配器的反向设计四篇文献，供相关领域的科研人员参考。领域一 100GHz以上有源和无源用户之间的动态频谱共享 Dynamic spectrum sharing between active and passive users above 100 GHz Michele Polese, etc. Communications Engineering, 2022 Sixth-generation wireless networks will aggregate higher-than-ever mobile traffic into ultra-high capacity backhaul links, which could be deployed on the largely untapped spectrum above 100 GHz. Current regulations however prevent the allocation of large contiguous bands for communications at these frequencies, since several narrow bands are reserved to protect passive sensing services. These include radio astronomy and Earth exploration satellites using sensors that suffer from harmful interference from active transmitters. Here we show that active and passive spectrum sharing above 100 GHz is feasible by introducing and experimentally evaluating a real-time, dual-band backhaul prototype that tracks the presence of passive users (in this case the NASA satellite Aura) and avoids interference by automatically switching bands (123.5–140 GHz and 210–225 GHz). Our system enables wide-band transmissions in the above-100-GHz spectrum, while avoiding harmful interference to satellite systems, paving the way for innovative spectrum policy and technologies in these crucial bands. https://www.nature.com/articles/s44172-022-00002-x Fig. Prototype schematics and dual-band backhaul link deployment. 领域二用于6G通信系统的单层二硫化钼开关 Monolayer molybdenum disulfide switches for 6G communication systems Myungsoo Kim, etc. Nature Electronics, 2022 Atomically thin two-dimensional materials—including transitional metal dichalcogenides and hexagonal boron nitride—can exhibit non-volatile resistive switching. This switching behaviour could be used to create analogue switches for use in high-frequency communication, but has so far been limited to frequencies relevant to the fifth generation of wireless communication technology. Here we show that non-volatile switches made from monolayer molybdenum disulfide in a metal–insulator–metal structure can operate at frequencies corresponding to the sixth-generation communication band (around 100–500 GHz). The switches exhibit low insertion loss in the ON state and high isolation in the OFF state up to 480 GHz with sub-nanosecond pulse switching. We obtain the eye diagrams and constellation diagrams at various data transmission rates and modulations to evaluate the device performance, including real-time data communication up to 100 Gbit s-1 at a carrier frequency of 320 GHz, with a low bit error rate and high signal-to-noise ratio. https://www.nature.com/articles/s41928-022-00766-2 Fig. Material, device structure, and d.c. and pulse switching. 领域三使用轨道角动量复用的太赫兹无线链路中接收器孔径和多径对功率损耗和模式串扰的影响 Receiver aperture and multipath effects on power loss and modal crosstalk in a THz wireless link using orbital-angular-momentum multiplexing Xinzhou Su, etc. Scientific Reports, 2022 The channel capacity of terahertz (THz) wireless communications can be increased by multiplexing multiple orthogonal data-carrying orbital-angular-momentum (OAM) beams. In THz links using OAM multiplexing (e.g., Laguerre-Gaussian LGl,p beams with p = 0), the system performance might degrade due to limited receiver aperture size and multipath effects. A limited-size aperture can truncate the received beam profile along the radial direction. In addition, due to beam divergence, part of the beam might interact with reflectors in the environment, causing the signal to reflect and interfere at the receiver with the directly propagating part of the beam; this is known as the multipath effect. In this paper, we simulate and analyze the impact of both effects on the equality of the THz OAM link by considering a full two-dimensional (2-D) LG modal set. The simulation results show (i) a limited-size receiver aperture can induce power loss and modal power coupling mainly to LG modes with the same l but p > 0 for directly propagated OAM beams; (ii) the multipath effect can induce modal power coupling across multiple 2-D LG modes, which leads to inter-channel coupling among the different channels in an OAM multiplexed link; (iii) the interference between the reflected and direct beams can induce intra-channel coupling between the received signals from the reflected and direct beams; and (iv) beams with a higher OAM order (e.g., from ± 1 to ± 5) or a lower carrier frequency (e.g., from 0.1 to 1 THz) experience larger intra- and inter-channel coupling. The intra- and inter-channel coupling in an OAM-multiplexed THz link can degrade the signal-to-noise ratio (SNR) and induce SNR penalty when compared to a single-channel system. https://www.nature.com/articles/s41598-022-18444-w Fig. Schematic of limited-size receiver aperture and multipath effects in a THz OAM link. 领域四用于5G应用的具有任意输出的紧凑型功率分配器的反向设计 Inverse design of compact power divider with arbitrary outputs for 5G applications Maryam Shadi, etc. Scientific Reports, 2022 Since the recent on-demand applications need more sophisticated circuits and subsystems, components with configurable capabilities attract attention more than before in commercial systems, specifically the fifth generation (5G). Power dividers play a crucial role in 5G phased array systems, and their role becomes more significant if the output powers ratio is adjustable. Here, we suggest a design methodology by which planar power splitters with arbitrary output power levels can be designed in light of very simple perturbations, i.e., vias. Through our design procedure, we find an optimized pattern for hybrid vias-some of them are made of PEC, and others are dielectric, e.g., air, high-permittivity materials. Thanks to deep neural networks, we demonstrate that this technique can be employed to design power splitters whose output ports have different amplitudes. In light of the proposed method, we fabricated and measured a 4-way power divider realizing Chebyshev coefficients for sidelobe reduction of a 4-element array at 28 GHz as a proof-of-concept. We believe that this methodology in which hybrid perturbation is the key spot paves a way to implement complex functions in various platforms and other structures, e.g., SIWs, ridge waveguides, rather than the one we investigated (planar/microstrip). https://www.nature.com/articles/s41598-022-17212-0 Fig. (a) Traditional feeding network in sub-array antenna (b) new compact and affordable structure to control amplitude level of primary array’s elements.

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