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Novel Methodology to Assess RF Performance of Co-located MIMO Radar Systems Transmitting Binary Phased Coded Waveforms 一种评估同址MIMO雷达系统传输二相编码波形射频性能的新方法
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360823
N. Colon-Diaz, D. Janning, Patrick M. McCormick, J. Aberle, D. Bliss
─ In this work an experimental radar testbed and dual directional couplers (DDC) are used to collect measurements of the forward and reverse waves at each element, its mutual coupling, and beam-patterns. The collected measured data is used to validate a methodology for assessing radio frequency (RF) performance of a co-located multiple-input multipleoutput (MIMO) radar system transmitting binary phased coded (BP) waveforms. The estimated and measured active reflection coefficient (ARC) and beam-patterns are presented. The effect of different excitations and mutual coupling on the radiated fields is also presented. Index Terms ─ Active reflection coefficient, co-located MIMO radar, coupled power, mutual coupling.
在这项工作中,实验雷达测试平台和双向耦合器(DDC)用于收集每个单元的正向和反向波,其相互耦合和波束模式的测量。收集到的测量数据用于验证一种方法,该方法用于评估同一位置的多输入多输出(MIMO)雷达系统传输二进制相位编码(BP)波形的射频(RF)性能。给出了估计和测量的主动反射系数(ARC)和波束方向图。讨论了不同激励和相互耦合对辐射场的影响。指标项─主动反射系数、同址MIMO雷达、耦合功率、互耦。
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引用次数: 0
Central-Symmetry Decoupling Technique for Circularly-Polarized MIMO System of Tightly Packed Chinese-character Shaped Patch Antennas 紧密排列贴片天线圆极化MIMO系统的中心对称解耦技术
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.36091
K. Chung, Aiqi Cui, Mingliang Ma, Botao Feng, Yingsong Li
─ This article presents a novel decoupling technique for the circularly polarized multiple-inputmultiple-output (CP-MIMO) system composed of Guoshaped patch antennas. A comparative study has been conducted on antenna performance as a function of packing distance before and after applying the technique. A prototype of two-element Guo-shaped patch MIMO at a small inter-element spacing of 12.5 mm has devised aiming for the 5G new radio n38 (2.57-2.62 GHz) applications. Simulation reinforced with experimental results confirmed the effectiveness of the proposed technique, whereas the two Guo-shaped patch elements packed in such small spacing can be operated independently. Both the envelope correlation coefficient and diversity gain are approaching their ideal values. Index Terms ─ Antenna isolation, artistic patch antenna, Chinese-character-shaped patch antenna, CP-MIMO, decoupling technique.
本文提出了一种新的圆极化多输入多输出(CP-MIMO)系统解耦技术。采用该技术前后,天线性能随填料距离的变化进行了对比研究。针对5G新无线电n38 (2.57-2.62 GHz)应用,设计了一种元件间距为12.5毫米的双元件国形贴片MIMO原型。仿真和实验结果验证了该方法的有效性,两个“果”形贴片单元在如此小的间距内可以独立工作。包络相关系数和多样性增益均接近理想值。索引术语─天线隔离、艺术贴片天线、汉字贴片天线、CP-MIMO、去耦技术。
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引用次数: 16
A Novel Multidirectional Strain Sensor Realized by a 3D Microstrip-Line Fed Near-Circular Patch Antenna 用三维微带线馈电近圆贴片天线实现的新型多向应变传感器
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360917
Lingling Wang, K. Chung, Song Gao, Mingliang Ma, Jianlin Luo, Yingsong Li
─ In this paper, we propose a newly developed impedance method to gauge the variations of multidirectional strain using a near-circular-patch based sensor. A novel three-dimensional (3D) feeding mechanism realized by a 90-deg bended microstrip line is devised for allowing strain detection along any direction in the azimuth plane of a metallic surface. The simulated results, verified by experimental results, demonstrate that there is a linear relationship between normalized impedance and multi-directional strain with high sensitivities of about 100 ppm/με. The relationship between sensitivity and sensor orientation is derived as a cosine function, which is a useful feature for estimating principal strain direction. Index Terms ─ 3D feeding mechanism, multidirectional strain monitoring, near-circular-patch, strain sensor.
在本文中,我们提出了一种新开发的阻抗方法来测量基于近圆贴片的传感器的多向应变变化。设计了一种基于90度弯曲微带线的三维进给机构,用于金属表面方位面任意方向的应变检测。仿真结果与实验结果相吻合,表明归一化阻抗与多向应变呈线性关系,灵敏度约为100 ppm/με。灵敏度与传感器方向之间的关系被导出为余弦函数,这是估计主应变方向的有用特征。关键词:三维送料机构,多向应变监测,近圆贴片,应变传感器。
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引用次数: 1
A Low-Profile Dual-Polarized Antenna with High Isolation and High Front-to-Back Ratio for 5G Base Stations 面向5G基站的高隔离、高前后比的低轮廓双极化天线
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360916
M. Çiydem
─ A dual-polarized, broadband, slot-coupled patch antenna design is presented for sub-6 GHz 5G base stations. Proposed antenna is made up of two suspended stacked patches above feedline layer and is excited by crossed elliptic-H slots for ±45o slant, linear dual polarized operation. Prototyped antenna has an impedance bandwidth of 22.1% (3.14 3.92 GHz) for S11, S22 < −15 dB and port isolation S21 is also obtained to be < −28 dB in this band. Antenna exhibits directional radiation patterns with half power beamwidths of 57o 65o and 60o 64o in elevation and azimuth planes, respectively with varying gain of 8.6 9.1 dBi. Proposed antenna is also low profile (11.1 mm) with high front-toback ratio (> 27 dB) without reflector. Design details, numerical studies, and measurement results are presented. Index Terms ─ Dual-polarized, broadband antenna, isolation, front-to-back ratio, sub-6 GHz 5G base stations.
─提出了一种适用于6 GHz以下5G基站的双极化宽带槽耦合贴片天线设计。该天线在馈线层上方由两个悬浮堆叠的贴片组成,由交叉椭圆- h槽激励,进行±45°倾斜线性双极化工作。样机天线在S11、S22< - 15 dB时阻抗带宽为22.1% (3.14 - 3.92 GHz),端口隔离S21也在该频段< - 28 dB。天线在仰角面和方位面分别呈现出570 ~ 650°和600 ~ 640°的半功率波束定向辐射方向图,变化增益为8.6 ~ 9.1 dBi。拟议的天线也是低轮廓(11.1毫米),具有高前后比(> 27 dB),没有反射器。介绍了设计细节、数值研究和测量结果。索引术语─双极化、宽带天线、隔离、前后比、低于6 GHz的5G基站。
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引用次数: 0
Reduction of Cogging Torque in AFPM Machine Using Elliptical-Trapezoidal-Shaped Permanent Magnet 椭圆-梯形永磁体减小AFPM电机齿槽转矩
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360819
S. Ali, J. Ikram, C. Devereux, S. Bukhari, S. Khan, N. Khan, J. Ro
─ The reduction in cogging torque enables smooth operation and an increase in the torque density of the machine. This research aims to minimize cogging torque in dual rotor single stator axial flux permanent magnet (AFPM) machine. Reduction in cogging torque makes the back EMF sinusoidal and reduces the torque ripples in AFPM machine. In this paper, an elliptical trapezoidal-shaped permanent magnet (PM) is proposed to minimize torque ripples of the AFPM machine. The 3D finite element analysis (FEA) is used for the analysis of AFPM machine. The optimization of AFPM machine is done by employing the asymmetric magnet-overhang along with the parameters of elliptical-shaped PM using Genetic algorithm (GA). Index Terms ─ Axial flux machine, cogging torque, elliptical-trapezoidal magnet, FEA, slot-less, torque ripples.
─齿槽扭矩的减小使操作平稳,并增加了机器的扭矩密度。本研究的目的是使双转子单定子轴向磁通永磁(AFPM)电机的齿槽转矩最小。齿槽转矩的减小使反电动势呈正弦波,减小了AFPM电机的转矩波动。本文提出了一种椭圆梯形永磁体(PM)来减小AFPM电机的转矩波动。采用三维有限元分析(FEA)对AFPM机床进行分析。采用非对称磁体悬伸法,结合椭圆型永磁材料的参数,利用遗传算法对永磁材料进行优化。索引项─轴向磁通机,齿槽转矩,椭圆-梯形磁体,有限元分析,无槽转矩波纹。
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引用次数: 6
Ultra-wideband Transmissive Linear Polarization Device Based on Graphene 基于石墨烯的超宽带透射线性偏振器件
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360714
Liwei Guo, Simin Li, Xing Jiang, Xin Liao, Lin Peng
In order to achieve both adjustable wideband and high Polarization Conversion Rate (PCR) of the transmitted waves, a novelty tri-layered structure is proposed for terahertz applications. The Rhombus Hollow Square (RHS) is built up by top and bottom gold gratings on Silicon Dioxide and Polyamide substrate with graphene strips. The proposed polarizer broadens the bandwidth and has well performance. As chemical potential increases, the bandwidth is also broadened by adjusting the graphene. From 0.5 THz to 3 THz, the PCR is greater than 90%, and the relative bandwidth up to 142.9%. The transmission and absorption of polarizer are analyzed at the oblique incidence with chemical potential 0.1eV. By simulating and analyzing the performance, a new result of maintaining broadband and high transmittance in oblique incidence is obtained.
为了实现传输波的可调宽带和高偏振转换率,提出了一种新型的三层结构用于太赫兹应用。Rhombus Hollow Square (RHS)是由二氧化硅和聚酰胺衬底上的顶部和底部金光栅与石墨烯条构成的。该偏振器拓宽了带宽,具有良好的性能。随着化学势的增加,通过调整石墨烯,带宽也会变宽。在0.5 ~ 3thz范围内,聚合酶链反应大于90%,相对带宽达142.9%。分析了偏振片在化学势为0.1eV的斜入射下的透射和吸收特性。通过仿真分析,得到了在斜入射下保持宽带和高透射率的新结果。
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引用次数: 2
Accurate Far-Field Measurement of Wide-Angle Scanning Phased Array Antennas 广角扫描相控阵天线的精确远场测量
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360915
H. Tang, Xianbao Zheng
─ This paper presents a new approach to the accurate determination of the far-field (FF) pattern of wide-angle scanning phased array antennas (PAAs) that uses planar near-field (NF) technology. When PAAs are engaged in wide-angle scanning, a finite scanning plane and inaccurate probe compensation can lead to truncation errors. The proposed approach reduces these by rotating the PAA to make its main beam perpendicular to the scanning plane. To verify the effectiveness of the approach, both theoretical calculations and actual measurements were undertaken. The simulated and measured results prove that the proposed method is more accurate than traditional NF technology for a large PAA scanning angle, such as ψ0=50° and Δ0=50° (in simulation; 54° when measured). Index Terms ─ Antenna measurement, planar near-field technology, wide-angle scanning phased array antenna.
──本文提出了一种利用平面近场技术精确测定广角扫描相控阵天线远场方向图的新方法。当PAAs进行广角扫描时,有限的扫描平面和不准确的探头补偿会导致截断误差。所提出的方法通过旋转PAA使其主光束垂直于扫描平面来减少这些问题。为了验证该方法的有效性,进行了理论计算和实际测量。仿真和实测结果表明,对于较大的PAA扫描角,如仿真中的ψ0=50°和Δ0=50°,所提出的方法比传统的NF技术具有更高的精度;测量时为54°)。检索术语─天线测量、平面近场技术、广角扫描相控阵天线。
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引用次数: 0
Ultra-wideband Flexible Implantable Antenna for Wireless Capsule Endoscopy System with Performance Improvement 改进无线胶囊内窥镜系统的超宽带柔性植入式天线
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2020.aces.j.360618
Yang Feng, Pan Chen, Shaopeng Pan, Gaosheng Li
The implantable antenna is an important part of the wireless capsule endoscopy (WCE) system to achieve wireless communication. This paper designed an ultra-wideband flexible implantable antenna for wireless capsule endoscopy system. With a very wide bandwidth, the antenna can completely cover the industrial, scientific, and medical frequency bands (ISM, 2.4-2.48 GHz) and Wireless Medical Telemetry Service (WMTS, 1.395-1.4 GHz). The expanded size of the proposed antenna is 18mm× 10mm× 0.1mm. The conformal technology of the antenna has further reduced the space of the system and achieved miniaturization. The capsule antenna in this paper is a compact planar monopole antenna fed by a coplanar waveguide, and it uses a flexible material as a dielectric substrate to achieve the conformal shape of the antenna. U-shaped ground branch (UGB) and a loaded split ring resonator (SRR) structure were used to further improve the antenna performance. Simulation and measurement results were basically the same. On the premise of radiation safety and miniaturization of the antenna, the ultra-wideband operation of the antenna was realized. This antenna design provided reference value for the design and application of the capsule antenna.
植入式天线是无线胶囊内窥镜(WCE)系统实现无线通信的重要组成部分。设计了一种用于无线胶囊内窥镜系统的超宽带柔性植入式天线。该天线具有非常宽的带宽,可以完全覆盖工业、科学和医疗频段(ISM, 2.4-2.48 GHz)和无线医疗遥测服务(WMTS, 1.395-1.4 GHz)。天线的扩展尺寸为18mm× 10mm× 0.1mm。天线的保形技术进一步缩小了系统的空间,实现了小型化。本文的胶囊天线是一种紧凑的平面单极天线,采用共面波导馈电,采用柔性材料作为电介质衬底,实现了天线的共形。采用u型接地支路(UGB)和负载分环谐振器(SRR)结构,进一步提高了天线性能。仿真结果与实测结果基本一致。在保证天线辐射安全和小型化的前提下,实现了天线的超宽带工作。该天线设计为胶囊天线的设计和应用提供了参考价值。
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引用次数: 0
Tunable Terahertz Plasmon-Induced Transparency in Resonator-Coupled Dirac Semimetal Waveguides 谐振腔耦合狄拉克半金属波导中可调谐太赫兹等离子体诱导的透明度
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2020.aces.j.360609
Daobin Wang, Jiahuan Yang, Wen Wang, Li-hua Yuan, Xiaoxiao Li
The bulk Dirac semimetal (BDS) is an interesting material, similar to graphene, which can dynamically adjust its optical properties via a variation in its Fermi energy or electrical voltage. In this work, a BDS-based plasmonic device, which enables tunable terahertz plasmon-induced transparency, was proposed and designed. By using the finite element method, the surface plasmon polariton and plasmon-induced transparency of this device were systematically investigated. The results demonstrate that the plasmon-induced transparency of such device can be dynamically tuned by varying its Fermi energy. When the Fermi energy changes from 55 meV to 95 meV, the maximum group delay time of the device increases from 13.2 ps to 21 ps. In the case of a cascading device, the maximum group delay time can be further pushed up to 44.57 ps. The influence of the ambient refractive index on the optical properties of the proposed device was also considered and investigated.
体狄拉克半金属(BDS)是一种有趣的材料,类似于石墨烯,可以通过费米能量或电压的变化动态地调整其光学特性。在这项工作中,提出并设计了一种基于北斗系统的等离子体器件,该器件可以实现可调谐的太赫兹等离子体诱导透明度。采用有限元方法,系统地研究了该器件的表面等离子激元极化和等离子激元诱导的透明度。结果表明,该装置的等离子体诱导透明度可以通过改变其费米能量来动态调节。当费米能量从55 meV增加到95 meV时,器件的最大群延迟时间从13.2 ps增加到21 ps,在级联器件的情况下,最大群延迟时间可以进一步提高到44.57 ps,并考虑和研究了环境折射率对器件光学性能的影响。
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引用次数: 1
Compact High Gain Multiband Antenna Based on Split Ring Resonator and Inverted F Slots for 5G Industry Applications 5G工业应用中基于分环谐振器和倒F槽的紧凑型高增益多频段天线
IF 0.7 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2021-01-01 DOI: 10.47037/2021.aces.j.360808
Ranjan Mishra, Rajeev Dandotiya, Ankush Kapoor, P. Kumar
─ This paper presents the design, optimization, fabrication, and measurement of the compact high gain microstrip antenna with a split ring resonator and set of inverted-F slots along with a matching stub for sub-6 GHz5G applications. In this investigation, different iterations are visualized by incorporating inverted F slots, a split ring resonator, and a matching stub in the transmission line. The advantages of each incorporated structure are analyzed, and a hybrid antenna consisting of the combination is proposed as a final antenna configuration with the optimum results. The proposed final design attains compactness and multi-band operation. Impedance matching is improved by using the stub matched technique at the feed line. The designed antenna shows the resonances at precisely 2.1 GHz, 3.3 GHz, and 4.1GHz. The proposed antenna is suitable for mobile cellular communication such as the LTE band (2.1 GHz), n78 band (3.3 GHz), and n77 band (4.1 GHz) of 5G bands. The gain retrieved from each band attains more than 5 dB value. Index Terms ─ Fifth generation (5G), inverted F-slot, Split Ring Resonator (SRR), stub matching.
─本文介绍了紧凑型高增益微带天线的设计、优化、制造和测量,该天线具有分环谐振器和一组反f槽以及用于sub-6 GHz5G应用的匹配stub。在本研究中,通过在传输线中加入倒F槽、分环谐振器和匹配短段来可视化不同的迭代。分析了每种组合结构的优点,提出了一种具有最佳效果的混合天线结构。提出的最终设计实现了紧凑和多波段操作。在馈线处采用短段匹配技术,改善了阻抗匹配。设计的天线精确显示出2.1 GHz、3.3 GHz和4.1GHz的谐振频率。该天线适用于5G频段的LTE频段(2.1 GHz)、n78频段(3.3 GHz)、n77频段(4.1 GHz)等移动蜂窝通信。从每个波段检索的增益达到5db以上的值。索引项─第五代(5G)、倒f槽、裂环谐振器(SRR)、短段匹配。
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引用次数: 7
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