Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402)最新文献_第6页

Common-mode currents in transmission line structures caused by asymmetric sources or load impedance 非对称源或负载阻抗引起的传输线结构中的共模电流

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853929

Danyang Zhu, Changsheng Shi

引用次数: 0

Spectrum consideration for wireless communications in the twenty first century 21世纪无线通信的频谱考虑

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853892

S. Ting, Zou Zhao Hui, Li Yu Gang

{"title":"Spectrum consideration for wireless communications in the twenty first century","authors":"S. Ting, Zou Zhao Hui, Li Yu Gang","doi":"10.1109/CEEM.2000.853892","DOIUrl":"https://doi.org/10.1109/CEEM.2000.853892","url":null,"abstract":"It is expected that wireless users will exceed one billion by the, year 2010. Besides voice, a new range of services such as multimedia, high-speed-data, etc. are being offered for delivery over wireless networks. Mobility will be seamless, realizing the concept of persons' being in contact anywhere, at anytime. There are some fundamental aspects such as limited spectrum, propagation effects, and unknown and time varying access will result in a profound impact on the choice of technologies to provide future mobile communications. So that the challenges to the technologies imposed by the radio spectrum limitations, radio channel propagation induced distortions, are seriously concerned by manufactures, operators, and regulators. The International Telecommunications Union (ITU) is engaged in development of global standards for wireless communications, and is referred to as International Mobile Telecommunications 2000 (IMT-2000). Wireless ATM (WATM) is expected to provide significantly high bit-rate services to meet the demand for handing multimedia information, such as high definition still pictures, moving pictures, and large files. In addition, WATM is required to provide a variety of services like CBR, VER, ABR, and UBR, and flexible connection, including symmetric/asymmetric bandwidth to support multimedia services. This article gives an overview of the frequency considerations of IMT-2000. It is very important in order to effectively use the limited spectrum resource and in selecting suitable third generation wireless technologies.","PeriodicalId":153945,"journal":{"name":"Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122058911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Surface impedance matrix boundary condition of coaxial cables braided layer 同轴电缆编织层的表面阻抗矩阵边界条件

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853928

Guolin Li, Danyang Zhu, Changsheng Shi

引用次数: 0

Calculation of normalized site attenuation from antenna factors 根据天线因素计算归一化站点衰减

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853973

Liu Shufang, Gao You-gang

引用次数: 0

An adaptive wavelet denoising method for the measuring system of EMP signals EMP信号测量系统的自适应小波去噪方法

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853917

Shi Lihua, Chen Bin, Zhou Binhua, Gao Cheng

引用次数: 1

A study on suppression of self resonance of metal chassis by means of the hybrid magnetic material 杂化磁性材料抑制金属底盘自共振的研究

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853957

Y. Hotta, Xiaohe Li, S. Nitta

{"title":"A study on suppression of self resonance of metal chassis by means of the hybrid magnetic material","authors":"Y. Hotta, Xiaohe Li, S. Nitta","doi":"10.1109/CEEM.2000.853957","DOIUrl":"https://doi.org/10.1109/CEEM.2000.853957","url":null,"abstract":"Many noise suppression techniques have been applied and put to practical use, but in the near future, the signal processing speed and frequency spectrum will become increasingly higher, and the size of equipment will become smaller, and so new technology to reduce EMI radiation and to enhance immunity are still demanded. It is expected that not only the interference between inter-systems by EMI radiation from the equipment but also the interference inside the equipment causes the degradation of system reliability. The equipment cabinet constructed of conductive materials has self-resonance frequency. When electromagnetic excitation occurs inside the cabinet by EMI radiation from inner circuits, the strong electromagnetic field is generated inside the cabinet at the self-resonance frequency, makes EMI radiation from cabinet increase and degrades the immunity of the inner circuit. To suppress the radiation from the cabinet and interface cable by suppressing Q of the self-resonance and to enhance immunity are requested. The authors propose to use hybrid magnetic materials which contain magnetic material and dielectric material in order to suppress the value of Q and verify the effect.","PeriodicalId":153945,"journal":{"name":"Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132147340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Outage probability for microcellular mobile radio systems in Rician fading channels 微蜂窝移动无线电系统在衰落信道中的中断概率

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853904

Wan Yan, Z. Hongbo

引用次数: 0

Energy radiated by the switching of currents in a system of conductors 由导体系统中电流的转换所辐射的能量

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853896

G. Mrozynski

{"title":"Energy radiated by the switching of currents in a system of conductors","authors":"G. Mrozynski","doi":"10.1109/CEEM.2000.853896","DOIUrl":"https://doi.org/10.1109/CEEM.2000.853896","url":null,"abstract":"The calculation of transient electromagnetic fields is becoming more important future because of the increasing demands on system design under EMC-constraints. The switching of currents in a system of conductors is especially crucial because a transient wave is stimulated in the nonconducting environment which can be responsible for the default of electronic systems. The total energy which is radiated by the transient wave can be calculated by integrating the Poynting vector over an appropriate closed surface and over the time interval between the switching moment and infinity. The calculation of the total energy radiated by a switching process can be simplified by applying the principle of conservation of energy. As a consequence only the energy which is dissipated in the conducting space during the transient current distribution after the moment of switching has to be calculated. The applicability is shown for two examples. In the first one a permeable and conducting hollow sphere is exposed to the transient field of a current of arbitrary time dependence flowing in a loop of arbitrary shape. In the second, a continuous current flowing in a homogeneous two wire loop in parallel with a solid conductor of rectangular cross section is switched off. At the moment of switching a part of the energy of the nonconducting space is transferred by a guided wave. The remaining energy can be calculated from the current sheet which is excited on the conductor's surface at the moment of switching. This part of the energy is dissipated in the material during the following transient current distribution.","PeriodicalId":153945,"journal":{"name":"Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121387149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Busbar transient current computation based on singularity expansion method 基于奇异展开法的母线暂态电流计算

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853914

Weidong Zhang, X. Cui, T. Lu

引用次数: 0

Antenna factors of the new EUROTEM cell for fully compliant emission and immunity testing 用于完全符合发射和抗扰度测试的新型EUROTEM天线单元的天线因子

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402) Pub Date : 2000-05-03 DOI: 10.1109/CEEM.2000.853970

D. Hansen, D. Ristau

{"title":"Antenna factors of the new EUROTEM cell for fully compliant emission and immunity testing","authors":"D. Hansen, D. Ristau","doi":"10.1109/CEEM.2000.853970","DOIUrl":"https://doi.org/10.1109/CEEM.2000.853970","url":null,"abstract":"The EUROTEM(R) is a patented compact symmetrical TEM device with 4 striplines which are surrounded by a fully absorber-lined ferrite enclosure. Due to the broad band nature of the device, it is well suited for radiated emissions and immunity testing, compliant with the standards. In order to perform compliance measurements, the corresponding antenna factors have to be determined. Correlation to OATS measurements must be established. The EUROTEM devices are scaleable and can be built in different sizes. The range of test objects starts at printed circuit boards all the way up to two metre high racks. For large test objects, the arrangement can be fitted into an existing fully absorber-lined room. This arrangement is called EUROTEM-Antenna. By this retrofit, the conventional antenna mast and the typical EMC antennas are substituted with the EUROTEM antenna leading to savings in driving power and consequently in considerable cost savings for the amplifier. In contrast to the 10 year old GTEM technology, the EUROTEM is equipped with polarisation switching. The test object will be put on a turntable in the same manner as in any open area test site or absorber chamber. There is no rotation through the three spatial axes which is required using a GTEM cell and the corresponding manipulator. The EUROTEM is superior to the conventional technology by showing better field quality, better suppression of the non-TEM field components and in particular the better cost efficiency factor.","PeriodicalId":153945,"journal":{"name":"Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117044051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1