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On passive intermodulation at microwave frequencies 微波频率无源互调研究
He Huan, Fu Wen-bin
The appearance of PIM products bring a lot of harm into modern satellite communication systems. In this paper, the fundamental concept, mechanism and prediction of PIM are studied. And one mathematical model is given, which is able to predict high order PIM level by using low order PIM level.
PIM产品的出现给现代卫星通信系统带来了诸多危害。本文对PIM的基本概念、机理和预测进行了研究。给出了一个用低阶PIM水平预测高阶PIM水平的数学模型。
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引用次数: 14
The progress of photonic sensor development to measure the RF electric and magnetic fields 测量射频电场和磁场的光子传感器的研究进展
Wenlie Lian, W. Shay, Mao Sheng Huanq, Wen-Jen Tseng
A new series of RF electric and magnetic field photonic sensors have being developed at the Center for Measurement Standards (CMS) of the Industrial Technology Research Institute (ITRI) in Taiwan. The aim of this research project is to develop affordable optical electro-magnetic field sensors (OEFS and OMFS) for EMC measurement and monitoring purposes. Here we report for the first time the performance of these sensors.
台湾工业技术研究院(工研院)测量标准中心(CMS)开发了一系列新的射频电场和磁场光子传感器。本研究项目的目的是开发可负担得起的光电磁场传感器(OEFS和OMFS),用于EMC测量和监测目的。本文首次报道了这些传感器的性能。
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引用次数: 9
Ionospheric perturbation associated with earthquakes, as revealed from subionospheric VLF/LF propagation 从亚层VLF/LF传播揭示的与地震相关的电离层扰动
M. Hayakawa, O. Molchanov
NASDA (National Space Development Agency of Japan) has just finished the Earthquake Remote Sensing Frontier Project conducted since 1996 within the framework of the Earthquake Frontier Projects by the former STA (Science and Technology Agency). The main emphasis of NASDA's Frontier Project was the complete understanding of lithosphere-atmosphere-ionosphere (LAI) coupling by making full use of different kinds of observational items and finally we contribute to the short-term earthquake prediction. The most exciting finding from our Frontier project was the discovery of convincing evidence on the presence of seismo-ionospheric perturbations, which has been extensively investigated by using the subionospheric VLF/LF propagation, and several important findings have been presented, including the initial result for the Kobe earthquake and a few case studies from much data.
NASDA(日本国家空间开发机构)刚刚完成了自1996年以来在原科学技术机构地震前沿项目框架内进行的地震遥感前沿项目。NASDA前沿项目的重点是充分利用各种观测项目,全面了解岩石圈-大气-电离层(LAI)耦合,最终为短期地震预报做出贡献。我们的前沿项目最令人兴奋的发现是发现了令人信服的证据,证明了地震-电离层扰动的存在,这已经通过使用亚层VLF/LF传播进行了广泛的研究,并提出了几个重要的发现,包括神户地震的初步结果和来自大量数据的一些案例研究。
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引用次数: 0
Analysis on shielding effectiveness of metallic enclosures with slot 带槽金属外壳屏蔽效能分析
Yingpeng Fan, Zhengwei Du, Ke Gong, Guoding Li
The FDTD method is used to study how shielding effectiveness varies with slot length, width and cavity size. The results show that slot resonance occurs when a slot perimeter reaches odd times of the wavelength of the incident wave and the shielding effectiveness becomes rather poor in such cases.
利用时域有限差分法研究了屏蔽效能随狭缝长度、宽度和腔体尺寸的变化规律。结果表明,当缝隙周长达到入射波波长的奇数倍时,会发生缝隙共振,此时的屏蔽效果较差。
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引用次数: 2
Analysis for shielding effectiveness of infinite metal plate with arrayed apertures using semi-analytical FDTD 用半解析FDTD分析具有排列孔径的无限金属板的屏蔽效能
Bao Yongfang, L. Yinghua
We compute and analyze the shielding effectiveness of the infinite perfect conductor plate with arrayed slender apertures using semi-analytical FDTD. The solution offers advice on designing an electrical equipment box with apertures.
利用半解析时域有限差分法计算和分析了细长孔排列的无限完美导体板的屏蔽效能。对带孔电气设备箱的设计提出了建议。
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引用次数: 0
Crosstalk analysis for TLs in special directions 特殊方向上tl的串扰分析
Song Zhan-hai, Li Yuan-An, Li Shu-lan, Yan Shu-bing, Ge Yong-qing
In this paper crosstalk between transmission lines. (TL) in special directions such as perpendicular and parallel is studied in the frequency domain and time domain via electromagnetic field (EMF) theory. Magnitude of crosstalk between the two states is compared. Regulations of when the peaks or troughs should occur are summarized, results are verified with that of the finite-difference time-domain (FDTD) method.
本文主要研究传输线间的串扰。利用电磁场理论,从频域和时域两方面研究了垂直、平行等特殊方向上的TL。比较了两种状态间串扰的大小。总结了波峰和波谷出现的规律,并用时域有限差分法(FDTD)对结果进行了验证。
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引用次数: 2
Analysis of shielding effectiveness of reinforced-concrete in high power electromagnetic environment 强电磁环境下钢筋混凝土屏蔽效能分析
Chen Bin, Y. Yun, Gao Cheng, Z. Bi-hua, Wen Wang
The finite-difference time domain (FDTD) method is used to analyze shielding effectiveness of the infinite wire-mesh reinforcement, reinforced-concrete layer and concrete-only layer in a high power electromagnetic environment. Our research takes into account all the factors affecting shielding effectiveness (jointing of reinforcing steels' cross points, connection of the reinforcement hoops and natural defensive layers). Numerical examples concerning the analysis are given in this paper.
采用时域有限差分(FDTD)方法分析了无限大钢丝网钢筋、钢筋混凝土层和纯混凝土层在高功率电磁环境下的屏蔽效能。我们的研究考虑了影响屏蔽效果的所有因素(钢筋交叉点的连接,钢筋箍与天然防御层的连接)。文中给出了数值算例。
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引用次数: 13
Influence of power system's harmonic voltage on leakage current of MOA 电力系统谐波电压对MOA漏电流的影响
Wang Yongqiang, Lu Fangcheng
Surge arresters are important over voltage protection equipment in a substation. It is necessary to monitor the resistive leakage current of MOAs (metal oxide surge arresters) on line so that we can prevent faults from developing in time to avoid economic loss. It is reasonable to adopt the resistive leakage currents basic component, i/sub r/, and thrice component, i/sub 3r/, as metal oxide surge arrester indicators. These indicators can detect the aging phenomenon of a metal oxide surge arrester in time. However, the existence of harmonic voltages in the power system influences the indicator accuracy. We analyze this effect and put forward an improved compensation method to separate the resistive leakage current under the existence of harmonic voltage. Finally, according to these methods, we develop an on-line MOA resistive current monitoring system based on the bus-module.
避雷器是变电站中重要的过电压保护设备。对金属氧化物避雷器的漏阻电流进行在线监测是必要的,这样可以及时防止故障的发生,避免经济损失。金属氧化物避雷器指标采用电阻性漏电流基分量i/sub r/和三分量i/sub 3r/是合理的。这些指标可以及时检测金属氧化物避雷器的老化现象。然而,电力系统中谐波电压的存在影响了指标的准确性。分析了这种影响,提出了一种改进的补偿方法来分离谐波电压存在下的电阻性漏电流。最后,根据这些方法,我们开发了一个基于总线模块的MOA电阻电流在线监测系统。
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引用次数: 5
A EMC design for PC104 I/O module PC104 I/O模块的EMC设计
Zhi.Jun. Yao, Chunguang Xu, D. Xiao, Shi-yuan Zhou
Noise sources and fundamental mechanisms leading to radiated emissions from printed circuit boards (PCBs) have been analyzed. The use of photoelectric couplers at the input and output interfaces between PCBs and of image planes on the PCBs reduces common-mode radiation; the effectiveness has been proved to comply with GJB151A-97 EMI limits.
分析了印制电路板(pcb)辐射发射的噪声源和基本机理。在pcb之间的输入和输出接口以及pcb上的成像平面上使用光电耦合器可以减少共模辐射;其有效性已被证明符合GJB151A-97的EMI限制。
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引用次数: 0
Estimation of the EMP response of a system from its continuous wave measurement results 根据系统的连续波测量结果估计系统的电磁脉冲响应
Shi Lihua, Li Zhengdong, L. Yanxin, Chen Bin, GaoCheng, Z. Bi-hua
Traditionally, the electromagnetic protection ability of a system, such as filters, shielding enclosures, etc., is measured in the frequency-domain and expressed as insertion loss or shielding effectiveness. When the time-domain characteristics of the system are required to evaluate their pulse response, time-domain tests need to be conducted. However, it may not be convenient to carried out time-domain tests because of the availability of test facilities. Theoretically, suppose the system works in a linear range, its pulse response can be estimated from frequency-domain measured data. We evaluated this concept by experiments. A digital filter model of the system under test is used to approximate the measured frequency response and then employed to calculate the output of the system under pulsed input. The estimated pulse responses are compared with measured ones. Results show that it is possible to estimate approximately the magnitude and shape of the time-domain response by this approach.
传统上,系统的电磁保护能力,如滤波器、屏蔽外壳等,是在频域测量的,并表示为插入损耗或屏蔽效能。当需要系统的时域特性来评估其脉冲响应时,就需要进行时域测试。然而,由于测试设施的可用性,进行时域测试可能不方便。理论上,假设系统工作在线性范围内,可以从频域测量数据估计其脉冲响应。我们通过实验来评估这个概念。用待测系统的数字滤波器模型来近似测量频率响应,然后计算脉冲输入下系统的输出。将估计的脉冲响应与实测的脉冲响应进行了比较。结果表明,用这种方法可以近似地估计时域响应的大小和形状。
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引用次数: 2
期刊
Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.
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