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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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A device for radiation emission testing in the outdoor environment 一种用于室外环境辐射发射测试的装置
Yuhan Liu, Jie Ren
With the popularization of various electronic and electrical equipment, radiation emission testing of equipment is becoming more and more important. For some larger electronic and electrical equipment or systems, the size is too large to be easily measured at traditional test sites. Therefore, a device for radiation emission test in noisy environment is proposed in this paper, then the simulation is carried out with HFSS, and the effect of the device on noise suppression is verified.
随着各种电子电气设备的普及,设备的辐射发射检测变得越来越重要。对于一些较大的电子和电气设备或系统,尺寸太大,无法在传统的测试场所轻松测量。因此,本文提出了一种噪声环境下的辐射发射测试装置,并利用HFSS进行了仿真,验证了该装置对噪声抑制的效果。
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引用次数: 0
The simulation of electromagnetic scattering from a cluster of needles based on discrete dipole approximation 基于离散偶极近似的针簇电磁散射模拟
Yafang Ding, Dawei Liu, Xinya Qiao
In this paper, the volume integration equation based on Discrete Dipole Approximation (DDA) is applied to calculating the electromagnetic scattering field of a cluster of needles. The cubic dipole cells are used to discretize scatterers. Furthermore, this paper novelly considers the role of the irregular parts of the scatterers' edge. The backscattering cross section and the bistatic scattering cross section of the cluster of needles calculated by DDA algorithm are compared with the results obtained by the analytical algorithms of the Generalized by Rayleigh-Gans Approximation (GRGA) algorithm and Thin Dielectric Cylinder (TDC) algorithm. In addition, the comparison of the results with considering the parts in the edge of scatterers and without considering it is presented in this paper. The simulation demonstrates that the numerical solution is better than the analytical solution, but the analytic solution is more efficient in the backscattering and bistatic scattering of a cluster of needles. Moreover, the algorithm considering the portion in the edge of the scatterers can improve computational efficiency and reduce storage space. In conclusion, the study for bistatic scattering of dense scatterers by taking into account the parts in the edge of scatterers are meaningful in the sight of computational efficiency and accuracy.
本文采用离散偶极子近似(DDA)的体积积分方程计算了针簇的电磁散射场。利用立方偶极子单元对散射体进行离散。此外,本文还新颖地考虑了散射体边缘不规则部分的作用。将DDA算法计算的针簇后向散射截面和双稳态散射截面与广义瑞利-甘斯近似(GRGA)算法和薄介电圆柱(TDC)算法的解析算法计算结果进行了比较。此外,本文还对考虑散射体边缘部分和不考虑边缘部分的结果进行了比较。仿真结果表明,数值解优于解析解,但解析解在针状簇的后向散射和双稳态散射中更有效。此外,该算法考虑了散射体边缘部分,提高了计算效率,减少了存储空间。综上所述,考虑散射体边缘部分的密集散射体的双稳态散射研究在计算效率和精度方面是有意义的。
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引用次数: 0
Pulmonary CT image denoising algorithm based on curvelet transform criterion 基于曲线变换准则的肺部CT图像去噪算法
Shi Zhen-gang, Li Qin-zi
Noise pollution on pulmonary CT images is always unavoidable during the acqisition of the images, traditional denoising algorithm can't successfully get rid of noise on pulmonary CT images effectively without destroying the texture and edge features. In order to filter noise of pulmonary CT images and keep the edge and texture signal in images, this paper presents a pulmonary CT images denoising algorithm based on Curvelet transform. First, algorithm carries on Curvelet transform to noisy pulmonary CT images. Then algorithm constructs direction criteria and scale criteria for noise determination in the curve wave domain, and noisy pulmonary CT images is denoised. At last, curved wave inverse transformation is performed and the denoised pulmonary CT images is obtained. Experimental results show that this method has better effect for keeping edge and visual smooth, compared with traditional curvelet threshold shrink method.
肺部CT图像的噪声污染在图像采集过程中是不可避免的,传统的去噪算法在不破坏肺部CT图像的纹理和边缘特征的情况下无法有效地去除肺部CT图像上的噪声。为了过滤肺部CT图像中的噪声,保留图像中的边缘和纹理信号,提出了一种基于Curvelet变换的肺部CT图像去噪算法。该算法首先对肺部CT图像的噪声进行Curvelet变换。然后在曲线波域构造方向准则和尺度准则进行噪声判定,对肺部CT图像进行去噪处理。最后进行弯曲波反变换,得到去噪后的肺部CT图像。实验结果表明,与传统的曲线阈值收缩方法相比,该方法在保持边缘和视觉平滑方面具有更好的效果。
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引用次数: 3
Interpolate the magnetic field data during the geomagnetic storm 插值地磁暴期间的磁场数据
Liu Qing, Han Kangkang, Xu Ting
This paper aims to interpolate the magnetic field data, which needs to be utilized to assess the potential disrupt caused by the geomagnetic storm. The available magnetic data is very sparse over the Earth's surface. To address this issue, this paper proposes an interpolation method that takes the magnetic field inherent characteristics into account. The real magnetic data over a three-month period is analyzed and the dependencies between the observatories are extracted and these interdependencies are eventually considered in the interpolation and higher performance is achieved.
本文旨在插值磁场数据,利用这些数据来评估地磁风暴造成的潜在破坏。地球表面可用的磁场数据非常稀少。针对这一问题,本文提出了一种考虑磁场固有特性的插值方法。对3个月的实测磁资料进行分析,提取各观测台之间的依赖关系,最终在插值中考虑这些相互依赖关系,从而获得更高的插值性能。
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引用次数: 0
Measurement of radiated electric field caused by VFTO of UHV GIS circuit breaker 特高压GIS断路器VFTO辐射电场的测量
Songyuan Li, Cong Zhao, Suya Li, Xiao Yu, Jun-bo Deng, Qing Liu, Le Wang
The radiation electric fields caused by the switching of 1100kV and 550kV GIS circuit breakers are measured by optical fiber measuring system. The waveform characteristics of radiation field and the frequency range are analyzed in this paper. The results show that the radiation field amplitude of 1100kVGIS circuit breaker actions can be up to 0.78kV/m, and the amplitude of radiation filed by 550kVGIS breaker produces can be up to 0.13kV/m. The frequency range of 1100kV GIS is from 20MHz to 100MHz, which is higher than the frequency range 0–5MHz of 550kV GIS. In addition, different types of tests can affect the frequency of electric field pulses, leading to different pulse polarity characteristics.
采用光纤测量系统测量了1100kV和550kV GIS断路器开关产生的辐射电场。分析了辐射场的波形特性和频率范围。结果表明,1100kVGIS断路器动作产生的辐射场幅值可达0.78kV/m, 550kVGIS断路器动作产生的辐射场幅值可达0.13kV/m。1100kV GIS的频率范围为20MHz ~ 100MHz,高于550kV GIS的0 ~ 5mhz频率范围。此外,不同类型的测试会影响电场脉冲的频率,从而导致不同的脉冲极性特性。
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引用次数: 3
The calculation method of the inductance for three-phase air reactors 三相空气电抗器电感的计算方法
Zheng Liping, Yang Botao
For the design of air core reactors, the inductance calculation is an important technical parameter. Because air core reactors usually work in the three-phase condition, in this paper, the calculation method of the inductance of three-phase air reactors is obtained by using the method of equal division. Firstly, the magnetic flux, the induced potential and the self inductance and mutual inductance of the single-phase air reactor can be calculated accurately by using the method of equal division, Then, the division of different methods was taken according to the structure characteristics of three-phase reactors, and the calculation method of the mutual inductance between coils can be worked out for the three-phase air reactor in the different arrangements. This method is high accurate, simple and practical. The calculation example was given.
在空芯电抗器的设计中,电感计算是一个重要的技术参数。由于空心电抗器通常工作在三相状态下,本文采用等分法得到三相空心电抗器电感的计算方法。首先采用等分法精确计算出单相空气电抗器的磁通量、感应电位和自感互感,然后根据三相电抗器的结构特点进行不同方法的划分,得出三相空气电抗器在不同布置方式下线圈间互感的计算方法。该方法精度高、操作简单、实用。给出了计算实例。
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引用次数: 0
The research on shielding effectiveness measurement for electromagnetic shielding garments 电磁屏蔽服屏蔽效能测量方法研究
Chao-Chun. Chen, Yu-sang, Yi-Miao
A novel measurement system is established to analyze the performance of electromagnetic shielding garments in anechoic chamber. The human phantom body is filled with absorbing material instead of tissue fluid to prevent cavity effect and save the cost of manpower and money. An electric field probe is put in the abdominal cavity of human phantom body to receive the electromagnetic waves. Then electric field value of the abdominal cavity is measured with or without electromagnetic shielding garments on human phantom body. After comparing the mesured shielding effectiveness (SE) of different garments and the fabrics made into those different garments, the performance between garments and their corresponding fabrics are also discussed. It concludes that the design style is the determining factor to affect the SE value rather than metal fiber content. The research results can be applied to production and trade.
为分析暗室电磁屏蔽服的性能,建立了一种新的测量系统。人体幻影体用吸收材料填充代替组织液,防止了空腔效应,节省了人力和金钱成本。将电场探头置入人体幻体腹腔内,接收电磁波。然后在人体上穿或不穿电磁屏蔽服时测量腹腔电场值。在比较了不同服装及其面料的屏蔽效能的基础上,讨论了不同服装及其面料的屏蔽效能。结果表明,影响SE值的决定性因素不是金属纤维含量,而是设计风格。研究结果可应用于生产和贸易。
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引用次数: 4
Data-driven approach for the prediction of remaining useful life 预测剩余使用寿命的数据驱动方法
Guo Xie, Xin Li, Chunli Zhang, Xinhong Hei, F. Qian, Shaolin Hu, Yuan Cao, B. Cai
Based on the data of the life cycle degradation of lithium ion batteries in Maryland University, this paper analyzes the life degradation process of lithium ion batteries and selects the empirical degradation model. A method for the prediction of lithium ion battery based on EKF / KF is proposed. The EKF algorithm is used to estimate the historical data. Then, the remaining useful life of the lithium ion battery is estimated based on the KF algorithm. The validity of the algorithm is verified by the lithium ion battery data of the University of Maryland, and the algorithm is evaluated by the MAE index.
本文基于马里兰大学锂离子电池生命周期退化数据,分析了锂离子电池的寿命退化过程,选择了经验退化模型。提出了一种基于EKF / KF的锂离子电池寿命预测方法。采用EKF算法对历史数据进行估计。然后,基于KF算法估计锂离子电池的剩余使用寿命。通过马里兰大学的锂离子电池数据验证了算法的有效性,并通过MAE指数对算法进行了评价。
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引用次数: 0
Substrate integrated waveguide leaky-wave antenna for fixed-frequency beam steering 用于定频波束导向的基片集成波导漏波天线
Yunjie Geng, Junhong Wang
A novel technique to achieve fixed-frequency beam steering leaky-wave antenna (LWA) based on substrate integrated waveguide (SIW) is presented. The main beam direction can be controlled by changing the effective width of the waveguide. The antenna structure contains two rows of vias located along the waveguide on each side. The outer row of vias is fixed. The spacing between the adjacent vias of the inner row can be changed, so the effective width of the waveguide is varied, therefore the beam angle of the antenna is controlled. The results of full-wave simulation of the antenna show the ability of the main beam controlling, which can be adjusted from 36° to 70° at 5.8 GHz for the parameters given in this paper.
提出了一种基于基片集成波导实现固定频率波束导向漏波天线的新技术。通过改变波导的有效宽度,可以控制主波束的方向。天线结构包括沿每侧波导的两排通孔。外排通孔是固定的。通过改变内排相邻通孔之间的间距,可以改变波导的有效宽度,从而控制天线的波束角。全波仿真结果表明,该天线具有良好的主波束控制能力,在本文给出的参数范围内,主波束在5.8 GHz频率下可从36°调节到70°。
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引用次数: 1
Design and simulation of a P-band substrate integrated waveguide horn antenna p波段基片集成波导喇叭天线的设计与仿真
Song Lizhong, L. Sai, Sun Bo, Lin Wei
This paper researched a kind of Substrate Integrated waveguide (SIWL) horn antenna, which works at P band. The discussed P-band SIW horn antenna has low profile and end-fire radiation pattern, so it is an alternative scheme when the dimension of antenna mounting platform is limited or the end fire radiation beam is required for the practical engineering application. This paper designed and simulated a SIW horn antenna fed with coaxial cable and the working frequency was 500MHz. The effects of substrate thickness on the performances of the SIW horn antenna was considered and simulated in order to diminish the height of SIW horn. The metal diaphragms were loaded at the side walls of the SIW horn, which were used to realize the impedance matching. The designed SIW horn antenna was simulated and optimized by use of full wave electromagnetic simulation software. The simulated voltage standing wave ratio (VSWR) of designed SIW horn antenna was less than 2 at the central frequency and directivity of the simulated SIW horn antenna is higher than 3dBi, and the end fire radiation pattern is also achieved. The height of the designed SIW horn antenna was 25 mm and low profile characteristic was also attained. Yet the band width of designed SIW horn antenna is narrow, so it is suitable for the case with narrow frequency range. The research results in this paper can provide certain technical references for some practical engineering applications.
本文研究了一种工作在P波段的基片集成波导(SIWL)喇叭天线。所讨论的p波段SIW喇叭天线具有低轮廓和端火辐射方向图的特点,因此在实际工程应用中,它是天线安装平台尺寸有限或端火辐射波束有要求时的备选方案。本文设计并仿真了一种工作频率为500MHz的同轴电缆馈电SIW喇叭天线。为了减小单声道喇叭的高度,考虑并模拟了衬底厚度对单声道喇叭天线性能的影响。在SIW喇叭的侧壁处加载金属膜片,用于实现阻抗匹配。利用全波电磁仿真软件对所设计的SIW喇叭天线进行了仿真和优化。所设计的SIW喇叭天线在中心频率处的模拟电压驻波比小于2,模拟的SIW喇叭天线的指向性大于3dBi,并获得了端火辐射方向图。所设计的SIW喇叭天线高度为25 mm,具有较低的轮廓特性。但所设计的SIW喇叭天线带宽较窄,适用于频率范围较窄的场合。本文的研究成果可为一些实际工程应用提供一定的技术参考。
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引用次数: 1
期刊
2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE)
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