BYR Achieve · 镜像论坛

在上一期前沿文献中推荐中，基于机器学习技术在6G网络中的应用，自治网络中可被信赖的深度学习，以及用于分布式网络管理的区块链技术等方向，选取了相关文献推荐给读者。在本期讨论中，我们将焦点落在5G/6G通信器件材料的最新进展方面，包括：100 GHZ的氧化锌肖特基二极管、超薄单晶LiNbO3 薄膜体声波谐振器，以及超表面辅助反向散射无线通信系统。同时，也选取了介绍用于5G和B5G通信的低轨道（LEO）小卫星组网系统的最新文献，推送给相关领域的科研人员，以供参考。领域一采用晶片级溶液法制备的100 GHZ氧化锌肖特基二极管 100 GHz zinc oxide Schottky diodes processed from solution on a wafer scale Dimitra G. Georgiadou, etc. Nature Electronics,2020 Inexpensive radio-frequency devices that can meet the ultrahigh-frequency needs of fifth-and sixth-generation wireless telecommunication networks are required. However, combining high performance with cost-effective scalable manufacturing has proved challenging. Here, we report the fabrication of solution-processed zinc oxide Schottky diodes that can operate in microwave and millimetre-wave frequency bands. The fully coplanar diodes are prepared using wafer-scale adhesion lithography to pattern two asymmetric metal electrodes separated by a gap of around 15 nm, and are completed with the deposition of a zinc oxide or aluminium-doped ZnO layer from solution. The Schottky diodes exhibit a maximum intrinsic cutoff frequency in excess of 100 GHz, and when integrated with other passive components yield radio-frequency energy-harvesting circuits that are capable of delivering output voltages of 600 mV and 260 mV at 2.45 GHz and 10 GHz, respectively. 领域二超薄单晶LiNbO3 薄膜体声波谐振器在5G通信的应用 Ultrathin single-crystalline LiNbO3 film bulk acoustic resonator for 5G communication Zijing Fang, etc Electronics Letters, 2020, 56(21): 1142 - 1143 This Letter reports a high-performance film bulk acoustic resonator (FBAR) that can be applied in 5G wireless communication. The FBAR has a back-etched free-standing structure using an ultra-thin single-crystalline lithium niobate (LiNbO3) as the piezoelectric film. The thin LiNbO3 was obtained by the smart cut method and FBARs were fabricated by a standard MEMS process. Owing to the superior bulk-like properties of the single-crystal thin film, the fabricated FBARs have a resonant frequency of 5.0 GHz, a quality factor above 1800 and an electromechanical coupling coefficient of 2.66%, demonstrating a promising potential of FBAR filters in 5G and future 6G applications. 领域三基于商用Wi-Fi信号实现的超表面辅助反向散射无线通信 Metasurface-assisted massive backscatter wireless communication with commodity Wi-Fi signals Hanting Zhao, etc. Nature Communications, 2020 Conventional wireless communication architecture, a backbone of our modern society, relies on actively generated carrier signals to transfer information, leading to important challenges including limited spectral resources and energy consumption. Backscatter communication systems, on the other hand, modulate an antenna’s impedance to encode information into already existing waves but suffer from low data rates and a lack of information security. Here, we introduce the concept of massive backscatter communication which modulates the propagation environment of stray ambient waves with a programmable metasurface. The metasurface’s large aperture and huge number of degrees of freedom enable unprecedented wave control and thereby secure and high-speed information transfer. Our prototype leveraging existing commodity 2.4 GHz Wi-Fi signals achieves data rates on the order of hundreds of Kbps. Our technique is applicable to all types of wave phenomena and provides a fundamentally new perspective on the role of metasurfaces in future wireless communication. 领域四用于5G和B5G通信的低轨道（LEO）小卫星组网 LEO Small-Satellite Constellations for 5G and Beyond-5G Communications Israel Leyva-Mayorga, etc. IEEE Access,2020,8: 184955 - 184964 The next frontier towards truly ubiquitous connectivity is the use of Low Earth Orbit (LEO) small-satellite constellations to support 5G and Beyond-5G (B5G) networks. Besides enhanced mobile broadband (eMBB) and massive machine-type communications (mMTC), LEO constellations can support ultra-reliable communications (URC) with relaxed latency requirements of a few tens of milliseconds. Small-satellite impairments and the use of low orbits pose major challenges to the design and performance of these networks, but also open new innovation opportunities. This paper provides a comprehensive overview of the physical and logical links, along with the essential architectural and technological components that enable the full integration of LEO constellations into 5G and B5G systems. Furthermore, we characterize and compare each physical link category and explore novel techniques to maximize the achievable data rates.

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