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2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)最新文献

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Dynamic Beam Switching with Shiftable Multimodal Anti-Reflective Coatings 可移动多模态抗反射涂层的动态光束切换
S. Marcus, A. Epstein
The implementation of non-specular reflection, generally referred to as perfect anomalous reflection, has been the realm of complex periodic metasurfaces consisting of multiple, painstakingly-designed meta-atoms. It has recently been shown that similar effects can be obtained from a basic periodic surface (BPS) with arbitrary properties, coated with several uniform dielectric layers which serve as a multimodal anti-reflective coating (MARC). In spite of its simplicity, the BPS-MARC combination can be easily designed to suppress all components of the discrete propagating Floquet-Bloch (FB) spectrum except the one in the design direction of interest. We show herein that the design direction of the reflected beam can be controlled by simply shifting the MARC relative to the BPS with the aid, for example, of a piezoelectric actuator. Such control enables dynamic beam switching from one radiation angle to another with almost-perfect efficiency. The MARC layers for this purpose are designed analytically and verified by full-wave computations, thus providing a new and conceptually simple method of efficient wave control in real time, highly useful for signal rerouting and multiplexing in reconfigurable antenna systems.
非镜面反射的实现,通常被称为完美反常反射,一直是由多个精心设计的元原子组成的复杂周期性超表面的领域。最近的研究表明,在具有任意性质的基本周期表面(BPS)上涂上几个均匀的介电层作为多模态抗反射涂层(MARC),也可以获得类似的效果。尽管它很简单,但BPS-MARC组合可以很容易地设计成抑制离散传播弗洛克-布洛赫(FB)频谱的所有分量,除了设计方向上感兴趣的分量。我们在此表明,反射光束的设计方向可以通过简单地移动MARC相对于BPS的辅助来控制,例如,压电驱动器。这种控制使光束能够以近乎完美的效率从一个辐射角切换到另一个辐射角。为此,对MARC层进行了解析设计,并通过全波计算进行了验证,从而提供了一种新的、概念简单的实时有效波控制方法,对可重构天线系统中的信号重路由和多路复用非常有用。
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引用次数: 0
Intelligent Network Edge with Distributed SDN for the Future 6G Network 面向未来6G网络的分布式SDN智能网络边缘
S. Weinstein, Yuan-Yao Lou, T. Hsing
Sixth generation wireless communication promises extremely high data rates, exceptionally low latency, and extensive use of an intelligent fog/edge platform including storage, communications, control and processing resources. This fog/edge platform will provide scalable and elastic distributed processing, communications flow management, and application support capabilities. An extended, more distributed SDN (software defined network) is likely to be an important element of this environment, enabling local picocell clients to more efficiently share processing and communications resources. This distributed SDN, with a local SDN controller handling local needs such as handoffs between picocells with very low latency and networked with distant SDN controllers for wide-area communication and information retrieval needs, will mediate the QoS for both highly interactive local applications and large volume streaming and downloading. The distributed SDN will facilitate access to application processing and locally stored data in the fog/edge platform and keep track of networking transactions and resource use. This concept of a distributed SDN coupled with network edge computing and data storage will support the entrepreneurial development of new network modalities and applications meeting the needs of network operators, service providers, and end users. This introductory paper, including a vehicular control simulation example, suggests the possible shape of an intelligent network edge incorporating a distributed SDN for the future 6G network. Keywords— fog/edge; SDN; 6G; distributed network control
第六代无线通信承诺极高的数据速率、极低的延迟,并广泛使用智能雾/边缘平台,包括存储、通信、控制和处理资源。这个雾/边缘平台将提供可扩展和弹性的分布式处理、通信流管理和应用程序支持功能。扩展的、更分布式的SDN(软件定义网络)可能是这种环境的重要元素,它使本地piccell客户端能够更有效地共享处理和通信资源。这种分布式SDN,使用本地SDN控制器处理本地需求,例如具有极低延迟的皮cell之间的切换,并与远程SDN控制器联网以满足广域通信和信息检索需求,将为高度交互的本地应用程序和大容量流和下载调解QoS。分布式SDN将促进对雾/边缘平台中应用程序处理和本地存储数据的访问,并跟踪网络事务和资源使用。这种将分布式SDN与网络边缘计算和数据存储相结合的概念,将支持满足网络运营商、服务提供商和最终用户需求的新网络模式和应用的创业开发。这篇介绍性论文,包括一个车辆控制仿真示例,提出了未来6G网络中包含分布式SDN的智能网络边缘的可能形状。关键字——雾/边缘;SDN;6克;分布式网络控制
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引用次数: 1
Metamaterial-based LTCC Compressed Luneburg Lens Antenna at 60 GHz for Wireless Communications 用于无线通信的60 GHz超材料LTCC压缩Luneburg透镜天线
D. Zelenchuk, Camilla Kärnfelt, F. Gallée, I. Munina
The paper presents a metamaterial based LTCC compressed Luneburg lens antenna for wireless communications. The antenna is designed at 60 GHz to utilize the unlicensed mm-wave spectrum available for short-range high-data-rate communications. The gradient index compressed Luneburg lens antenna is designed using the quasi-conformal transformation optics method. The design of the antenna is fully compliant with the standard LTCC process with a high-permittivity host material. The diameter of the antenna is 19 mm and the thickness is less than 2 mm. The peak antenna gain at 60 GHz of 16 dBi is demonstrated. Beam scanning capacity is demonstrated with 1 dB scan loss within ±25 degree field of view.
提出了一种基于超材料的LTCC压缩吕内堡透镜天线,用于无线通信。该天线设计为60ghz,利用未经许可的毫米波频谱,可用于短距离高数据速率通信。采用准共形变换光学方法设计了梯度折射率压缩吕尼堡透镜天线。天线的设计完全符合标准的LTCC工艺,采用高介电常数主机材料。天线直径19mm,厚度小于2mm。演示了16dbi的60 GHz峰值天线增益。波束扫描能力在±25度视场范围内以1 dB扫描损失进行演示。
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引用次数: 2
A Balanced, Series Fed Horn Array Antenna 一种平衡的串联馈电喇叭阵列天线
E. Levine, H. Matzner
A balanced, series-fed linear horn array antenna containing 6 horn elements is proposed. The antenna is matched from 9.4 to 10.5 GHz for SWR = 2. The total height of the antenna is 70 mm, the directivity of the antenna is between 21.8 - 22.6 dBi, the total efficiency is –0.3 dB, with low cross-polarization.
提出了一种包含6个喇叭单元的平衡串联线性喇叭阵列天线。当信噪比为2时,天线匹配范围为9.4 ~ 10.5 GHz。天线总高度为70 mm,天线的指向性在21.8 ~ 22.6 dBi之间,总效率为- 0.3 dB,具有低交叉极化。
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引用次数: 0
Performance of ARIMA modelling on sub-tropical rain attenuation at Ka-band terrestrial link in Kwazulu-Natal, South Africa 南非夸祖鲁-纳塔尔省ka波段地面链路副热带雨衰减的ARIMA模拟性能
A. O. Ayo, P. Owolawi, J. Ojo
The estimation of rain attenuation over a satellite link needs an accurate rainfall rate. The exponential development of satellite networks using higher-frequency bands such as Ka bands has highlighted the need to assess the combined effect of multiple diffusion impairments. The network of satellite communication links operating at Ku-band and above experiences rain fades due to signal absorption and dispersion. When considering link budget planning, the tropical and subtropical regions are of concern due to the high amount of precipitation when compared with the temperate regions. This paper examined the performance of the time-series ARIMA model on a Ka-band terrestrial link in Durban South Africa. The performance and validity are tested with the received signal level data measurements over a 6.73 km terrestrial LOS link centred at 19.5 GHz, the synthetic storm technique, and the International Telecommunication Union Recommendation model (ITU-R) based on rain attenuation generated from rain rate data over nine (9) years (20052013). The results reveal that the ITU-R model did not correspond with measured results. Hence, we tested a supervised learning-time series-based attenuation prediction method, which provides better performance than the existing models. Furthermore, the comparison with experimental results also shows that the proposed method has advantages of real-time forecast and high availability. The information from the present study will further provide quantitative insights on time-series rain fade needed in planning for 5G networks and beyond in the subtropical regions.
估算卫星链路上的降雨衰减需要精确的降雨率。使用Ka波段等高频波段的卫星网络的指数级发展突出了评估多重扩散损伤的综合影响的必要性。在ku波段及以上运行的卫星通信链路网络由于信号的吸收和色散而经历雨衰。在考虑链路预算规划时,由于热带和亚热带地区的降水量比温带地区大,因此值得关注。本文研究了时间序列ARIMA模型在南非德班ka波段地面链路上的性能。通过以19.5 GHz为中心的6.73公里地面LOS链路上的接收信号电平数据测量、合成风暴技术和国际电信联盟推荐模型(ITU-R),对其性能和有效性进行了测试,该模型基于九(9)年(2005 - 2013)期间降雨率数据产生的降雨衰减。结果表明,ITU-R模型与实测结果不一致。因此,我们测试了一种基于监督学习时间序列的衰减预测方法,该方法提供了比现有模型更好的性能。此外,与实验结果的对比也表明,该方法具有预测实时性和高可用性的优点。本研究的信息将进一步提供对亚热带地区5G网络及以后规划所需的时间序列雨褪的定量见解。
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引用次数: 0
Misunderstandings about radiofrequency electromagnetic field exposure and 5G misinformation 关于射频电磁场暴露和5G误传的误解
J. Rowley, H. Mazar
Public concern about potential health risks of radiofrequency electromagnetic field exposure (RF-EMF) from mobile networks and devices has ebbed and flowed over time with new claims and misinformation around 5G deployments. There remain misunderstandings about the nature and level of RF-EMF exposure from both mobile networks and devices. Measurements on live networks show that typical RF-EMF exposure levels from mobile networks and devices are a small fraction of international guidelines. 5G deployments will have little impact on RF-EMF levels. The consensus of independent expert groups and the World Health Organization is that there are no established health risks from such exposures.
随着时间的推移,公众对来自移动网络和设备的射频电磁场暴露(RF-EMF)潜在健康风险的担忧随着围绕5G部署的新主张和错误信息而消退和流动。人们对来自移动网络和设备的射频电磁场暴露的性质和水平仍然存在误解。对实时网络的测量表明,来自移动网络和设备的典型RF-EMF暴露水平仅占国际准则的一小部分。5G部署对RF-EMF水平的影响很小。独立专家组和世界卫生组织的共识是,这种接触没有确定的健康风险。
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引用次数: 0
A 0.4THz Radiating On-chip Locked Source in 65nm CMOS 一种基于65nm CMOS的0.4THz辐射片上锁定源
Firass Mustafa, E. Socher
In this paper a Y-band THz radiating CMOS source in the is presented. The source is based on a differential buffer- less Colpitts D-band VCO, which is tuned by controlling its gate- source capacitance through its transistor drain-gate voltage. The transistor drains are directly coupled to an on-chip loop antenna that chokes the fundamental signal while efficiently radiating the 3rd harmonic generated by the VCO transistor non-linearity. The source is locked using an external D-band source that radiates the CMOS chip and injection locks the source through its fundamental oscillation. The source can be tuned in a wide frequency range of 405 to 421 GHz with peak total output power of -15dBm (DC to THz radiated power efficiency of 0.1%), EIRP of -6 dBm and DC to EIRP power efficiency of 1.1%. This concept enables simple and cost-effective locked CMOS THz source arrays.
本文介绍了一种y波段太赫兹辐射CMOS源。该源基于差分无缓冲的柯氏d波段压控振荡器,通过其晶体管漏极电压控制其栅极源电容进行调谐。晶体管漏极直接耦合到片上环路天线,该天线抑制基频信号,同时有效地辐射由压控振荡器晶体管非线性产生的三次谐波。该源通过辐射CMOS芯片的外部d波段源锁定,注入通过其基本振荡锁定源。该源可以在405 ~ 421 GHz的宽频率范围内调谐,峰值总输出功率为-15dBm(直流至太赫兹辐射功率效率为0.1%),EIRP为-6 dBm, DC至EIRP功率效率为1.1%。该概念实现了简单且经济高效的锁定CMOS太赫兹源阵列。
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引用次数: 0
Lightning Susceptibility test per Mil Std 461G CS117, Translated to Engineering terms 按Mil标准461G CS117雷电敏感性试验,翻译成工程术语
O. Hartal
The Lightning Susceptibility test CS117 has been included in version G of Mil Std 461. it is given in terms of limits and method of measurement, which have no direct meaning for the engineer designing the equipment required to meet the test. This paper provides a simple method using the Laplace transforms to translate the test method and limits and some of the I/O port parameters and cable shield data to terms of expected voltages at port terminals of the tested equipment for tests conducted on shielded and unshielded cables, with some practical engineering results, enabling design of equipment compliant with the requirements.
雷电敏感性试验CS117已包含在Mil Std 461的G版中。它是以极限和测量方法的形式给出的,对设计满足试验要求的设备的工程师没有直接意义。本文提出了一种简单的方法,利用拉普拉斯变换将测试方法和限值以及部分I/O端口参数和电缆屏蔽数据转换为被测试设备端口终端的期望电压,用于屏蔽和非屏蔽电缆的测试,并取得了一些实际的工程结果,使设备的设计符合要求。
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引用次数: 0
Current Driven Plasma Instability in Graphene-FETs with Coulomb Electron Drag 具有库仑电子阻力的石墨烯-场效应管的电流驱动等离子体不稳定性
M. Ryzhii, V. Ryzhii, T. Otsuji, V. Mitin, M. Shur
We show that the ballistic electron injection from the n+ source region through the i-region into the gated n-region of the n+-i-n-n+ graphene field-effect transistor (GFET) leads to the effective drag of quasi-equilibrium electrons toward the drain. The drag results in the positive feedback between the ballistic injection and the reverse injection from the n+ drain region and can lead to the negative real part of the GFET source-drain impedance accompanied with the change of the impedance imaginary part sign. As a result, the steady-state current flow along the GFET channel can be unstable giving rise to the current driven self-excitation of the electron density high-frequency oscillations (plasma instability). The related oscillations of the current feeding an antenna can be used for the terahertz radiation emission.
我们证明了从n+源区通过i区进入n+-i-n-n+石墨烯场效应晶体管(GFET)的门控n区的弹道电子注入导致准平衡电子向漏极的有效阻力。阻力导致n+漏区弹道注入和反向注入之间的正反馈,导致GFET源漏阻抗实部为负,并伴随阻抗虚部符号的变化。因此,沿GFET通道的稳态电流流动可能是不稳定的,从而引起电流驱动的电子密度高频振荡(等离子体不稳定性)的自激。馈入天线的电流的相关振荡可以用于太赫兹辐射发射。
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引用次数: 0
Provably Secure Protocol for 5G HetNets 可证明的5G HetNets安全协议
V. O. Nyangaresi
The fifth generation (5G) networks exhibit high data rates and capacities that endear them to applications such as internet of things (IoT) and mobile banking. Due to sensitivity of data exchanged in these applications, security and privacy preservation schemes are essential for their deployments. The Third Generation Partnership Project (3GPP) has specified evolved packet system authentication and key agreement (EPSAKA) and 5G AKA protocols for mutually authenticating the communicating entities. However, these protocols are vulnerable to attacks such as impersonation, denial of service (DoS), hijacking and packet replays. Consequently, other schemes based on technologies such as blockchain, public key cryptography and certificates have been introduced to counter these threats. Unfortunately, these algorithms have either high computation and communication overheads or fail to effectively prevent these attacks. In this paper, a new key agreement and authentication protocol is presented. Security evaluation shows that this protocol upholds backward and forward key secrecy, and is robust against attacks such as privileged insider and privacy violations. In terms of performance, it exhibits average computation overheads compared with other related schemes.
第五代(5G)网络具有高数据速率和容量,使其适合物联网(IoT)和移动银行等应用。由于在这些应用程序中交换的数据的敏感性,安全和隐私保护方案对于它们的部署至关重要。第三代合作伙伴计划(3GPP)指定了演进分组系统认证和密钥协议(EPSAKA)和5G AKA协议,用于相互认证通信实体。然而,这些协议容易受到诸如冒充、拒绝服务(DoS)、劫持和数据包重放等攻击。因此,已经引入了基于区块链、公钥加密和证书等技术的其他方案来应对这些威胁。不幸的是,这些算法要么具有较高的计算和通信开销,要么无法有效地防止这些攻击。本文提出了一种新的密钥协议和认证协议。安全评估表明,该协议支持向后和向前密钥保密,并且对特权内部人员和隐私侵犯等攻击具有鲁棒性。在性能方面,与其他相关方案相比,它具有平均的计算开销。
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引用次数: 12
期刊
2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)
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