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2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE)最新文献

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Investigation of wireless power transfer with 3D metamaterial for efficiency enhancement 利用三维超材料提高无线传输效率的研究
Junfeng Chen, H. Tan
Metamaterial have shown great power of controlling the EM waves, which is mainly about the propagation property of far field. In this paper, three-dimensional (3D) metamaterials are used in near field wireless power transfer (WPT) system for efficiency enhanced. The 3D metamaterial structure is composed of 4×4×1-array of five-turn spiral resonators. The WPT with bulk metamaterial is investigated theoretically, experimentally, and by simulation. To verify the enhancement of the WPT system by using 3D metamaterial, the four-coil systems integrated with and without bulk metamaterial are investigated by vector network analyzer (VNA). As a result, the maximum efficiency improvement of 20% is obtained with the 3D metamaterials at 1.5m transfer distance. At the same time, the range of efficient power transfer can be greatly extended.
超材料对电磁波的控制能力很大,这主要表现在对远场传播特性的控制上。本文将三维超材料应用于近场无线电力传输系统中,以提高传输效率。三维超材料结构由五匝螺旋谐振腔4×4×1-array组成。本文从理论、实验和仿真三个方面对具有块状超材料的WPT进行了研究。为了验证三维超材料对WPT系统的增强作用,利用矢量网络分析仪(VNA)对集成和不集成块体超材料的四线圈系统进行了研究。结果表明,在1.5m的传输距离下,三维超材料的效率提高了20%。同时,可以大大扩展高效功率传输的范围。
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引用次数: 3
E-band wideband ME-dipole antenna array with hollow-waveguide feed network 带空波导馈电网络的e波段宽带me偶极子天线阵列
Shan Da, Yujian Li, Junhong Wang
A novel antenna array with new double-layer feed network and ME-dipoles is proposed. The antenna array consists of a full-corporate-feed air-full hollow-waveguide in the lower layer, a SIW feed network in the second layer, and ME-dipole antenna as the radiating elements which can be fabricated entirely with PCB technique. A simulated −10 dB impedance bandwidth wider than 25% and a gain up to 24 dBi for a 16×16-element array antenna are obtained in E-band, and the antenna is being fabricated.
提出了一种新型双层馈电网络和me偶极子的天线阵列。该天线阵列的底层为全公司馈电空腔波导,第二层为SIW馈电网络,辐射元件为me偶极子天线,可完全采用PCB技术制造。在e波段获得了−10 dB阻抗带宽大于25%、增益高达24 dBi的仿真16×16-element阵列天线,该天线正在制作中。
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引用次数: 0
Hybrid triplexer design using microstrip coupled line resonators for multiband WiMAX front end 多频段WiMAX前端采用微带耦合线谐振器的混合三工器设计
N. Shairi, M. A. Sazali, Z. Zakaria, I. Ibrahim, M. K. Zahari, B. Ahmad
In this paper, a hybrid triplexer design using microstrip coupled line resonators is proposed for the front end of multiband WiMAX system. The proposed triplexer consists of three different combinations of microstrip coupled line resonators, which are the open loop ring, parallel coupled line and folded coupled line. They were used as bandpass filters in the triplexer design to meet three different bandwidths in 2.3, 2.5, and 3.5 GHz bands. As a result, good agreements were achieved between simulation and measurement in terms of return and insertion losses, out of band attenuation, and bandwidth.
本文提出了一种基于微带耦合线谐振器的混合三工器设计方案,用于多频段WiMAX系统的前端。该三工器由三种不同的微带耦合线谐振器组合组成,即开环环、平行耦合线和折叠耦合线。它们在三工器设计中用作带通滤波器,以满足2.3、2.5和3.5 GHz频段的三种不同带宽。结果,在回波和插入损耗、带外衰减和带宽方面,仿真和测量结果非常一致。
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引用次数: 2
Real-time optimization analysis and design of communication on the safety computer of train control system 列车控制系统安全计算机通信实时优化分析与设计
Yifan Du, Lian-chuan Ma, Yuan Cao
At present, the safety computer use the first come first served (FCFS) approach to transmit data stream, but this method does not distinguish the data stream types, which may cause safety critical data stream transmission timeout. In order to meet the communication requirements of the future safety computer, by analyzing the characteristics of communication data and the main factors influencing real-time performance in the safety computer, the constrained multilevel priority scheduling strategy is proposed. This strategy consider the constraint relation between data frames under the conditions of meeting the multi-priority when the data to be transmitted. Through the network calculation method, the communication delay of different data stream in the two modes is analyzed. The improved scheduling strategy shortens the maximum delay of emergency safety critical data stream by 22.5% in the current safety computer under the condition of increasing the limited delay of non-safety critical data stream, so the strategy can effectively improve communication real-time performance of emergency safety critical data stream.
目前,安全计算机采用先到先得(FCFS)的方式传输数据流,但这种方式不区分数据流类型,可能造成安全临界数据流传输超时。为了满足未来安全计算机的通信需求,通过分析通信数据的特点和影响安全计算机实时性的主要因素,提出了约束多级优先级调度策略。该策略考虑了待传输数据在满足多优先级的条件下数据帧之间的约束关系。通过网络计算方法,分析了两种模式下不同数据流的通信时延。改进的调度策略在提高非安全关键数据流有限延迟的情况下,使当前安全计算机的应急安全关键数据流最大延迟缩短了22.5%,因此该策略可以有效提高应急安全关键数据流的通信实时性。
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引用次数: 0
A cost-benefit analyzation framework for distance education platform planning 远程教育平台规划的成本效益分析框架
Linlin Li, Xiangfu Meng
Proposed a cost-benefitanalyzation framework for distance education platforms from the view of IT-Governance theory. Major features of the framework include: (A) identifying performance from 5 domains of common IT-Governance models(B) assessing project risk and benefit by anonlinear evaluation algorithm(C) evaluating the cost-benefitratio on the inputs of risk, benefit and investment. The frameworkhas been applied in severalprojects. The paperdiscussed the models in the framework, and compared the evaluation results outputted by the framework and that byexperts.
从it治理理论出发,提出了远程教育平台的成本效益分析框架。该框架的主要特征包括:(A)从常见it治理模型的5个领域识别绩效(B)通过非线性评估算法评估项目风险和收益(C)评估风险、收益和投资投入的成本收益比。该框架已在多个项目中得到应用。对框架中的模型进行了讨论,并将框架的评价结果与专家的评价结果进行了比较。
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引用次数: 0
Weight-polling based task classification towards flexible computing 基于权轮询的任务分类,实现灵活计算
Yue Kong, Yikun Zhang, Yichuan Wang, Hao Chen, Xinhong Hei
With the development of cloud computing and IoT (Internet of Things), we almost arrive “Internet of everything”. The number of devices, which are deployed on the network edges, increasing sharply. It resulted in numerous data in sensing layer, and leads to network heavily loaded & high delay. Edge computing has its advantage “close to data source”, which can reduce the network latency significantly, but the ability of computing limited. In this paper, we propose a novel weight-polling based task classification scheme towards flexible computing. According to the demand characteristics of resources, tasks are divided into three types: computational, communication and storage. The goal of scheme is to trade off the costs between data transmission of cloud computing and compute of edge devices. The experimental results show that flexible computing can effectively reduce the network delay and response time, improve the resource utilization and task throughput, so as to take into account both the advantages of cloud computing and edge computing, to achieve the fairness of task scheduling.
随着云计算和物联网的发展,我们即将迎来“万物互联”。部署在网络边缘的设备数量急剧增加。它导致传感层数据量大,导致网络负载大、时延高。边缘计算具有“接近数据源”的优势,可以显著降低网络延迟,但计算能力有限。本文提出了一种新的基于权轮询的任务分类方案。根据资源的需求特点,将任务分为计算、通信和存储三种类型。该方案的目标是在云计算的数据传输和边缘设备的计算之间权衡成本。实验结果表明,灵活计算可以有效降低网络延迟和响应时间,提高资源利用率和任务吞吐量,从而兼顾云计算和边缘计算的优势,实现任务调度的公平性。
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引用次数: 0
FDTD-based multipath exploitation for through-wall radar imaging in the framework of CS CS框架下基于fdtd的穿壁雷达成像多径开发
Fangfang Wang, Huiying Wu
Multipath exploitation for through-wall radar imaging (TWRI) under the framework of compressive sensing (CS) is a promising method to obtain a high-resolution image with limited number of measurements. The capability of the existing method is limited due to the model error caused by approximated dictionary matrix calculated using ray optics method. In this paper, multipath propagation is calculated by finite-difference time domain (FDTD) technique and then compensated to obtain the linear inverse model correctly. Afterwards, sparse reconstruction is used to solve this linear inverse problem. Numerical results demonstrate that the proposed approach yields high resolution image free of multipath ghosts, thus allowing to increase the signal-to-clutter ratio image.
压缩感知(CS)框架下的穿壁雷达成像(TWRI)多路径开发是一种很有前途的方法,可以在有限的测量次数下获得高分辨率图像。现有方法由于采用射线光学方法计算的近似字典矩阵会产生模型误差,限制了现有方法的能力。本文采用时域有限差分(FDTD)技术计算多径传播,然后进行补偿,得到正确的线性逆模型。然后,利用稀疏重构方法求解该线性逆问题。数值结果表明,该方法可获得无多径鬼影的高分辨率图像,从而提高图像的信杂比。
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引用次数: 0
A study of monomolecular slicks' damping effect on Doppler spectrum from one-dimensional time-varying rough sea surfaces 一维时变粗糙海面单分子浮油对多普勒谱的阻尼效应研究
Pengju Yang, R. Wu, Ye Zhao, X. Ren, Yuqiang Zhang
The modeling of time-varying nonlinear sea surfaces damped by monomolecular sea slicks is presented in the present study by combining Lombardini et al. model that can predict the hydrodynamic damping of rough sea surfaces in the presence of monomolecular sea slicks and “choppy wave model” (CWM) that can describing the nonlinear interactions between ocean waves. On this basis, the influence of sea slick's damping on Doppler spectra of backscattered echoes from contaminated “choppy wave model” (CWM) nonlinear sea surfaces is investigated by comparison with the Doppler spectra of clean sea surfaces. Numerical simulations show a narrowing of the Doppler spectra of contaminated sea surfaces compared with those of clean sea. In addition, it is also indicated that the Doppler shifts in slicks can decrease or increase, depending on incidence angles.
本研究将Lombardini等预测单分子海面存在时粗糙海面水动力阻尼的模型与描述海浪间非线性相互作用的“巨浪模型”(CWM)相结合,建立了受单分子海面阻尼的时变非线性海面模型。在此基础上,通过与清洁海面的多普勒频谱比较,研究了浮油阻尼对污染“波浪模型”(CWM)非线性海面后向散射回波多普勒频谱的影响。数值模拟结果表明,污染海面的多普勒频谱比干净海面的多普勒频谱窄。此外,研究还表明,随入射角的不同,光圈内的多普勒频移可以减小或增大。
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引用次数: 0
Single interference direction finding algorithm research based on beidou four-element rectangular array and linear array 基于北斗四元矩形阵和线性阵的单干涉测向算法研究
Guoxuqiang, Gongwenfei
In this paper, the Capon beamformer and the MUSIC algorithm are used to estimate the direction of the single narrowband interference in the Beidou B3 band. Results show that the angle dimension can be estimated depends on the antenna formation. Array error was also corrected by the way of calibration method under unideal condition. The mutual coupling matrix and the amplitude-phase difference matrix were extracted by HFSS, and their inverse matrix were substituted into the algorithm to correct the results. Computer simulation experiments prove this method is effective.
本文采用Capon波束形成器和MUSIC算法对北斗B3波段的单窄带干扰进行方向估计。结果表明,角度尺寸可以根据天线的形成来估计。在不理想条件下,采用标定法对阵列误差进行了校正。利用HFSS提取互耦矩阵和幅相差矩阵,并将其逆矩阵代入算法对结果进行校正。计算机仿真实验证明了该方法的有效性。
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引用次数: 0
Study on time domain electromagnetic sputtering effect from low RCS chessboard surface with EBG structure EBG结构低RCS棋盘表面的时域电磁溅射效应研究
H. Hou, Junhong Wang
When the artificial magnetic conductor and perfect electric conductor are periodically arranged in checkboard. The phase difference between the reflected wave from artificial magnetic conductor (AMC) and perfect electric conductor (PEC) is 180°. So its radar cross section is very low. If the target covered by this type of AMC, its RCS can be reduced significantly, which brings difficulty for detection. To detect low RCS target, the time domain scattering from AMC surface is studied. It is found that the amplitude of the scattering is very large in the beginning. And it becomes low after a while. We call this phenomenon the time domain electromagnetic sputtering effect. In this paper, the time domain backward scattering is analyzed by the equivalent circuit method. The experimental system is designed to measure the time domain sputtering effect.
当人工磁导体和完美电导体周期性地排列在棋盘上时。人工磁导体(AMC)反射波与完美电导体(PEC)反射波的相位差为180°。所以它的雷达横截面很低。如果被这种类型的AMC覆盖,其RCS会明显降低,给检测带来困难。为了检测低RCS目标,研究了AMC表面的时域散射。研究发现,在初始阶段散射的振幅很大。过了一段时间它就变低了。我们称这种现象为时域电磁溅射效应。本文采用等效电路的方法对时域后向散射进行了分析。设计了一套测量时域溅射效应的实验系统。
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引用次数: 0
期刊
2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE)
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