Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238346
Yan Yi, Su Donglin
We study the reflection, transmission, and absorption of microwaves in nonuniform plasma. A discussion of the effect of various plasma parameters (such as electron density, collision frequency, etc.) on the reflected power, transmitted power and absorbed power of the microwave is presented. The nonuniform plasma slab studied is modeled by a series of subslabs, in each of which the electron density is assumed to be constant. We assume that the number density is constant in each subslab, and then the overall electron density is subject to a parabolic distribution. The total reflected, absorbed, and transmitted powers could then be deduced according to the calculation of the partial reflection coefficient and transmission coefficient at each slab.
{"title":"The reflection, transmission, and absorption of microwave in nonuniform plasma","authors":"Yan Yi, Su Donglin","doi":"10.1109/CEEM.2003.238346","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238346","url":null,"abstract":"We study the reflection, transmission, and absorption of microwaves in nonuniform plasma. A discussion of the effect of various plasma parameters (such as electron density, collision frequency, etc.) on the reflected power, transmitted power and absorbed power of the microwave is presented. The nonuniform plasma slab studied is modeled by a series of subslabs, in each of which the electron density is assumed to be constant. We assume that the number density is constant in each subslab, and then the overall electron density is subject to a parabolic distribution. The total reflected, absorbed, and transmitted powers could then be deduced according to the calculation of the partial reflection coefficient and transmission coefficient at each slab.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123405601","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238190
Chen Pingping, Z. Qian
In the design of a low cost, low weight, small size and high performance power converter, EMI design is a challenging task. The paper discuses the EMI design difference between low power and high power converters, and presents methods of passive cancellation of common mode current emission to reduce conducted EMI emissions and radiated emissions in a low power isolated converter. EMI design techniques based on near field measures are presented. A 2W flyback converter has been designed and results are experimentally verified.
{"title":"The EMI design of low power isolated converter based on near field measure","authors":"Chen Pingping, Z. Qian","doi":"10.1109/CEEM.2003.238190","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238190","url":null,"abstract":"In the design of a low cost, low weight, small size and high performance power converter, EMI design is a challenging task. The paper discuses the EMI design difference between low power and high power converters, and presents methods of passive cancellation of common mode current emission to reduce conducted EMI emissions and radiated emissions in a low power isolated converter. EMI design techniques based on near field measures are presented. A 2W flyback converter has been designed and results are experimentally verified.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121900277","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238189
T. V. Kartseva
The paper presents the approximate estimation of the PMD in an optical fibre, that occurs as a consequence of the electromagnetic field of a lightning stroke to earth in the vicinity of the fibre cable. The estimation is based on an analogy with the calculation of PMD in a fibre with eccentricity. A small rotation of the polarization plane of light in a fibre under the influence of a lightning field causes the same distribution of orthogonal modes to the main axis as a small eccentricity. Estimation can be made by this method if rotation is less than 20 grad.
{"title":"Estimation of polarization mode dispersion (PMD) value in optical fibre during lightning strokes","authors":"T. V. Kartseva","doi":"10.1109/CEEM.2003.238189","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238189","url":null,"abstract":"The paper presents the approximate estimation of the PMD in an optical fibre, that occurs as a consequence of the electromagnetic field of a lightning stroke to earth in the vicinity of the fibre cable. The estimation is based on an analogy with the calculation of PMD in a fibre with eccentricity. A small rotation of the polarization plane of light in a fibre under the influence of a lightning field causes the same distribution of orthogonal modes to the main axis as a small eccentricity. Estimation can be made by this method if rotation is less than 20 grad.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125221867","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238405
D. Fang
Some effective methods in computational electromagnetics other than those involved in commercial software are introduced. These methods include a space mapping technique, extra port method to involve parasitic influence, extrapolation and adaptive frequency sampling techniques, synthetic asymptote technique and artificial neural network technique. Their mechanisms, such as getting formulas or making use of the mapping between different levels, are not quite the same. They have the same goal, which is to make a good balance between accuracy and efficiency. The principle of each method is briefly addressed. Some research work done in the author's laboratory or in cooperation with others is introduced. Finally some future research work is suggested.
{"title":"Some effective methods in computational electromagnetics","authors":"D. Fang","doi":"10.1109/CEEM.2003.238405","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238405","url":null,"abstract":"Some effective methods in computational electromagnetics other than those involved in commercial software are introduced. These methods include a space mapping technique, extra port method to involve parasitic influence, extrapolation and adaptive frequency sampling techniques, synthetic asymptote technique and artificial neural network technique. Their mechanisms, such as getting formulas or making use of the mapping between different levels, are not quite the same. They have the same goal, which is to make a good balance between accuracy and efficiency. The principle of each method is briefly addressed. Some research work done in the author's laboratory or in cooperation with others is introduced. Finally some future research work is suggested.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129797432","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238541
Ruoting Chang
In this article the validation of a fully anechoic chamber adopted to perform an EMI compliance test is explored by conducting test and theoretical analysis, and a preferred limit which is correlated to the present limit based on OATS is provided.
{"title":"Rational comparison of field strength between semi-anechoic chamber and fully anechoic chamber","authors":"Ruoting Chang","doi":"10.1109/CEEM.2003.238541","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238541","url":null,"abstract":"In this article the validation of a fully anechoic chamber adopted to perform an EMI compliance test is explored by conducting test and theoretical analysis, and a preferred limit which is correlated to the present limit based on OATS is provided.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129251283","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238402
The following topics are dealt with: EMC in communication; EMC in computers and PCB; electromagnetic bioeffects; EM field theory; EM environment and EMI sources; ESD and EMP; seismo-electromagnetic phenomena; antennas, probes and EM sensors; transmission line theory; immunity and susceptibility; EMI prediction analysis and reduction techniques; lightning filtering, shielding and grounding; coupling and crosstalk EM calculation; EM wave propagation and scattering; and EMC measurement.
{"title":"Proceedings. Asia-Pacific Conference on Environmental Electromagnetics (IEEE Cat. No.03EX702)","authors":"","doi":"10.1109/CEEM.2003.238402","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238402","url":null,"abstract":"The following topics are dealt with: EMC in communication; EMC in computers and PCB; electromagnetic bioeffects; EM field theory; EM environment and EMI sources; ESD and EMP; seismo-electromagnetic phenomena; antennas, probes and EM sensors; transmission line theory; immunity and susceptibility; EMI prediction analysis and reduction techniques; lightning filtering, shielding and grounding; coupling and crosstalk EM calculation; EM wave propagation and scattering; and EMC measurement.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129350245","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.237925
N. A. Kazakova, P. Nagorskiy, E.I. Semerikova, B.B. Tsibikov
In this work observations are discussed in the response of the gravitation signal of the sounding inclined Doppler of the low acoustic (LFA) and internal gravitation (IGW) of waves in upper atmosphere, formed from pulsed sources: the process of earthquake preparing; the start of the rocket. In both events sources have broadband (/spl delta/-figurative) spectrum. The difference is concluded that in the process of preparing the earthquake source is found on land surfaces, and at the stairwell of a rocket in the upper atmosphere. The analysis given allows us to value the passband of the upper sound channel, and the band in which possible registration of the wave indignations are conditioned by earthquakes.
{"title":"Wave perturbations in upper atmosphere from pulsed sources","authors":"N. A. Kazakova, P. Nagorskiy, E.I. Semerikova, B.B. Tsibikov","doi":"10.1109/CEEM.2003.237925","DOIUrl":"https://doi.org/10.1109/CEEM.2003.237925","url":null,"abstract":"In this work observations are discussed in the response of the gravitation signal of the sounding inclined Doppler of the low acoustic (LFA) and internal gravitation (IGW) of waves in upper atmosphere, formed from pulsed sources: the process of earthquake preparing; the start of the rocket. In both events sources have broadband (/spl delta/-figurative) spectrum. The difference is concluded that in the process of preparing the earthquake source is found on land surfaces, and at the stairwell of a rocket in the upper atmosphere. The analysis given allows us to value the passband of the upper sound channel, and the band in which possible registration of the wave indignations are conditioned by earthquakes.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129444366","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238291
Wenfeng Cai, Xueguan Liu, Huiping Guo, H. Yin, Peikang Huang
By approximating electrically large scale objects with polygons, a concise expression for the physical optics (PO) method on electromagnetic scattering by arbitrary shaped conducting targets with partial coating is proposed in this paper, which is based on the theory of equivalent currents on arbitrary radio absorbing material (RAM) surface with infinite metal substrate. The fact that there are only simple algebraic operations without integration in our formula makes the calculation highly efficient and provides a good high-speed estimation of the RCS of electrically large scale conducting bodies with partial coating.
{"title":"A concise expression for PO method on electromagnetic scattering by arbitrary shaped conducting targets with partially coating","authors":"Wenfeng Cai, Xueguan Liu, Huiping Guo, H. Yin, Peikang Huang","doi":"10.1109/CEEM.2003.238291","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238291","url":null,"abstract":"By approximating electrically large scale objects with polygons, a concise expression for the physical optics (PO) method on electromagnetic scattering by arbitrary shaped conducting targets with partial coating is proposed in this paper, which is based on the theory of equivalent currents on arbitrary radio absorbing material (RAM) surface with infinite metal substrate. The fact that there are only simple algebraic operations without integration in our formula makes the calculation highly efficient and provides a good high-speed estimation of the RCS of electrically large scale conducting bodies with partial coating.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128519052","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.237878
K. Gotoh, K. Hattori, M. Hayakawa
The purpose of this report is to find out any ULF signature for the earthquakes in Izu islands in July 2000 (associated with volcanic activity) by means of a new signal processing method. The ULF data observed at three closely spaced stations in Izu peninsula, are subjected to the principal component analysis (PCA), and we have found that this PCA is very effective in distinguishing among different sources of ULF emissions (geomagnetic variation, man-made noise, and seismogenic emission). While, the first and second principal components are found to be associated with geomagnetic variation and man-made activity, respectively, the third principal component (residual noise like seismogenic emission if it exists) at night has indicated a significant temporal evolution; an enhancement for about 1.5 months (from early May to middle June) and a conspicuous minimum about ten days before the first earthquake on July 1 (magnitude 6.4), followed by a sharp increase a few days before the earthquakes. Furthermore, this component is found to be back to the background level a few months later than the earthquakes. This temporal pattern is in good agreement with those for previous large earthquake (Spitak, Loma Prieta, Guam and Biak earthquakes), so that this temporal evolution for the third principal component found by PCA is likely to be a precursory ULF signature of those Izu islands' earthquakes with its intensity of the order of 5% of the first principal component.
{"title":"Identification of ULF emissions for Izu islands earthquakes in July 2000","authors":"K. Gotoh, K. Hattori, M. Hayakawa","doi":"10.1109/CEEM.2003.237878","DOIUrl":"https://doi.org/10.1109/CEEM.2003.237878","url":null,"abstract":"The purpose of this report is to find out any ULF signature for the earthquakes in Izu islands in July 2000 (associated with volcanic activity) by means of a new signal processing method. The ULF data observed at three closely spaced stations in Izu peninsula, are subjected to the principal component analysis (PCA), and we have found that this PCA is very effective in distinguishing among different sources of ULF emissions (geomagnetic variation, man-made noise, and seismogenic emission). While, the first and second principal components are found to be associated with geomagnetic variation and man-made activity, respectively, the third principal component (residual noise like seismogenic emission if it exists) at night has indicated a significant temporal evolution; an enhancement for about 1.5 months (from early May to middle June) and a conspicuous minimum about ten days before the first earthquake on July 1 (magnitude 6.4), followed by a sharp increase a few days before the earthquakes. Furthermore, this component is found to be back to the background level a few months later than the earthquakes. This temporal pattern is in good agreement with those for previous large earthquake (Spitak, Loma Prieta, Guam and Biak earthquakes), so that this temporal evolution for the third principal component found by PCA is likely to be a precursory ULF signature of those Izu islands' earthquakes with its intensity of the order of 5% of the first principal component.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130550097","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238343
Y. Yun, Chen Bin, Z. Bi-hua, Gao Cheng, Lu Feng, Pei yu ling
The paper analyzes the response of power lines excited by an incident electromagnetic field. A new 2D FDTD method is proposed which analyzes the response of infinite scattering objects excited by electromagnetic waves at an oblique incidence. Maxwell's equations, differential equations and PML absorbing boundary conditions (ABC) are derived. The connecting boundary, where the incident wave is inducted, is computed by the 1D FDTD method. Several numerical calculations of this new FDTD method are provided and compared with the results of transmission line theory, proving the correctness and advantage of this new method.
{"title":"Study on infinite objects' scattering problems","authors":"Y. Yun, Chen Bin, Z. Bi-hua, Gao Cheng, Lu Feng, Pei yu ling","doi":"10.1109/CEEM.2003.238343","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238343","url":null,"abstract":"The paper analyzes the response of power lines excited by an incident electromagnetic field. A new 2D FDTD method is proposed which analyzes the response of infinite scattering objects excited by electromagnetic waves at an oblique incidence. Maxwell's equations, differential equations and PML absorbing boundary conditions (ABC) are derived. The connecting boundary, where the incident wave is inducted, is computed by the 1D FDTD method. Several numerical calculations of this new FDTD method are provided and compared with the results of transmission line theory, proving the correctness and advantage of this new method.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127682962","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}
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