Pub Date : 2012-11-12DOI: 10.1109/ISEMC.2012.6351652
M. R. Johnson
Feature Selection Validation has now become an IEEE Standard, and is gaining popularity in the Computational Electromagnetic Community. This paper presents an informal and admittedly unscientific survey of various professionals' opinion of the match of models and measurements. Four data sets were presented to individuals who were asked to give a global value, using the FSV Validation Rating Scale. This was compared to the average Global Data Measure for each data set. It is shown that over a sample of 28 people the average Global Data Measure did indeed agree with that calculated by FSV for two of our sample sets, and may have agreed with the other two under more rigid circumstances. Data was taken as functions of engineering background and levels of experience in the field of engineering in general, and electrical engineering specifically. This admittedly anecdotal data demonstrates that FSV can be a valuable tool, but human experience is key to understanding the use of any data set, and context of its use, as always, remains the most important aspect of evaluating results of the process.
{"title":"FSV versus human subjective data evaluation; an informal survey","authors":"M. R. Johnson","doi":"10.1109/ISEMC.2012.6351652","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351652","url":null,"abstract":"Feature Selection Validation has now become an IEEE Standard, and is gaining popularity in the Computational Electromagnetic Community. This paper presents an informal and admittedly unscientific survey of various professionals' opinion of the match of models and measurements. Four data sets were presented to individuals who were asked to give a global value, using the FSV Validation Rating Scale. This was compared to the average Global Data Measure for each data set. It is shown that over a sample of 28 people the average Global Data Measure did indeed agree with that calculated by FSV for two of our sample sets, and may have agreed with the other two under more rigid circumstances. Data was taken as functions of engineering background and levels of experience in the field of engineering in general, and electrical engineering specifically. This admittedly anecdotal data demonstrates that FSV can be a valuable tool, but human experience is key to understanding the use of any data set, and context of its use, as always, remains the most important aspect of evaluating results of the process.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124264156","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351826
V. Javor
Mechanical and thermal effects of lightning strokes depend on values of the impulse charge and specific energy of a lightning discharge current. For typical lightning currents and different lightning protection levels (LPL) as defined in IEC Std. 62305 these values can be calculated as the integral of channelbase current function and integral of the square of that function. The results presented in this paper for the new channel-base current function (NCBC) are in good agreement with experimentally measured values of these quantities. This function is used for approximating lightning channel-base currents and it provides a very simple calculation procedure. Values of the impulse charge and specific energy are useful for estimating reliability of some lightning protection structure and its parts for the defined LPL.
{"title":"Parameters of lightning stroke currents defining their mechanical and thermal effects","authors":"V. Javor","doi":"10.1109/ISEMC.2012.6351826","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351826","url":null,"abstract":"Mechanical and thermal effects of lightning strokes depend on values of the impulse charge and specific energy of a lightning discharge current. For typical lightning currents and different lightning protection levels (LPL) as defined in IEC Std. 62305 these values can be calculated as the integral of channelbase current function and integral of the square of that function. The results presented in this paper for the new channel-base current function (NCBC) are in good agreement with experimentally measured values of these quantities. This function is used for approximating lightning channel-base currents and it provides a very simple calculation procedure. Values of the impulse charge and specific energy are useful for estimating reliability of some lightning protection structure and its parts for the defined LPL.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124268831","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351767
K. Kam, A. Radchenko, D. Pommerenke
Near-field scanning is often used to solve EMC problems. Aside from the purpose of visualization of near-fields, measured near-field data can be used to estimate far-field. One of many challenges associated with using near-field to far-field transform (NFFFT) technique for EMC application is the handling of attached cables. The objective of this investigation is to evaluate different methods to add cable information to the near-field data for far-field estimation. The investigation is carried out using numerical experiments in EMCoS EMC studio, which is a commercial MoM (Method of Moment) tool for EM simulation. Measurement results from a test structure are also presented to validate the simulation results.
{"title":"On different methods to combine cable information into near-field data for far-field estimation","authors":"K. Kam, A. Radchenko, D. Pommerenke","doi":"10.1109/ISEMC.2012.6351767","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351767","url":null,"abstract":"Near-field scanning is often used to solve EMC problems. Aside from the purpose of visualization of near-fields, measured near-field data can be used to estimate far-field. One of many challenges associated with using near-field to far-field transform (NFFFT) technique for EMC application is the handling of attached cables. The objective of this investigation is to evaluate different methods to add cable information to the near-field data for far-field estimation. The investigation is carried out using numerical experiments in EMCoS EMC studio, which is a commercial MoM (Method of Moment) tool for EM simulation. Measurement results from a test structure are also presented to validate the simulation results.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123795581","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351819
N. Kuo, Han-Chang Hsieh, Jay-San Chen, Cheng-Nan Chiu, Ming-Shing Lin, C. Chen
In this paper, an effective and efficient approach is proposed to evaluate the frequency shifting and locking degradation in a microwave oscillator, illuminated by an incident plane wave. The analysis is performed by using equation-based equivalent sources embedded in the circuit schematic and incorporating the harmonic balance (HB) simulator. Most importantly, an auxiliary source is added in the simulation under the non-perturbation condition to search for the non-trivial solutions. A 795-MHz oscillator is created and simulated by this approach. The circuit performance measured inside an anechoic chamber is compared to the simulation with good agreement.
{"title":"Prediction of radiation-induced frequency locking and shifting in a microwave oscillator","authors":"N. Kuo, Han-Chang Hsieh, Jay-San Chen, Cheng-Nan Chiu, Ming-Shing Lin, C. Chen","doi":"10.1109/ISEMC.2012.6351819","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351819","url":null,"abstract":"In this paper, an effective and efficient approach is proposed to evaluate the frequency shifting and locking degradation in a microwave oscillator, illuminated by an incident plane wave. The analysis is performed by using equation-based equivalent sources embedded in the circuit schematic and incorporating the harmonic balance (HB) simulator. Most importantly, an auxiliary source is added in the simulation under the non-perturbation condition to search for the non-trivial solutions. A 795-MHz oscillator is created and simulated by this approach. The circuit performance measured inside an anechoic chamber is compared to the simulation with good agreement.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126283718","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6350919
P. Torío, M. Sanchez
Man-made noise (MMN) is an electromagnetic perturbation which is very harmful to digital communications, hence the general interest in suppressing it from communication channels. The main difficulty when trying to do so is to distinguish MMN from the transmitted signal. This paper presents a novel method to detect MMN, by taking advantage of its bandwidth which is much wider than that of a typical communication channel. Two variants are proposed: The first one demodulates the MMN within a wide bandwidth containing the communication channel; the second one demodulates the MMN within an idle channel next to the communication channel.
{"title":"Detecting man-made noise by using its wideband characteristic","authors":"P. Torío, M. Sanchez","doi":"10.1109/ISEMC.2012.6350919","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6350919","url":null,"abstract":"Man-made noise (MMN) is an electromagnetic perturbation which is very harmful to digital communications, hence the general interest in suppressing it from communication channels. The main difficulty when trying to do so is to distinguish MMN from the transmitted signal. This paper presents a novel method to detect MMN, by taking advantage of its bandwidth which is much wider than that of a typical communication channel. Two variants are proposed: The first one demodulates the MMN within a wide bandwidth containing the communication channel; the second one demodulates the MMN within an idle channel next to the communication channel.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131874776","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6350930
B. Cordill, S. A. Seguin, L. Cohen, J. de Graaf, L. Parent
When considering phased array radar systems it is important to consider the possible differences in the spectral content of radar emissions when comparing boresight to off-boresight. This detail is important as it can accentuate potential electromagnetic interference (EMI) effects between radar and other devices competing for space in a crowded spectrum. In order to analyze the potential impact of off-boresight radar emissions to other electronic devices, a MATLAB and electromagnetic model of a simple eight element slotted waveguide linear array operating at 3.5 GHz was simulated with an element spacing of a half-wavelength. The model was stimulated utilizing continuous wave (CW), pulsed amplitude, and linear Frequency Modulated Continuous-Wave (FMCW) waveforms. The spectral content of these emissions in the far-field was assessed at a variety of angles with respect to boresight. It was concluded that the eletromagnetic emissions power may be under measured if out of band emissions of a waveguide slot array are measured only at boresight resulting in compliance testing issues. This could result in the interference to other electronic devices being underestimated.
{"title":"Spectrum attributes of frequency-steerable phased array antennas","authors":"B. Cordill, S. A. Seguin, L. Cohen, J. de Graaf, L. Parent","doi":"10.1109/ISEMC.2012.6350930","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6350930","url":null,"abstract":"When considering phased array radar systems it is important to consider the possible differences in the spectral content of radar emissions when comparing boresight to off-boresight. This detail is important as it can accentuate potential electromagnetic interference (EMI) effects between radar and other devices competing for space in a crowded spectrum. In order to analyze the potential impact of off-boresight radar emissions to other electronic devices, a MATLAB and electromagnetic model of a simple eight element slotted waveguide linear array operating at 3.5 GHz was simulated with an element spacing of a half-wavelength. The model was stimulated utilizing continuous wave (CW), pulsed amplitude, and linear Frequency Modulated Continuous-Wave (FMCW) waveforms. The spectral content of these emissions in the far-field was assessed at a variety of angles with respect to boresight. It was concluded that the eletromagnetic emissions power may be under measured if out of band emissions of a waveguide slot array are measured only at boresight resulting in compliance testing issues. This could result in the interference to other electronic devices being underestimated.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128366687","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351833
J. Russer, S. Braun
Traditionally, measurements of electromagnetic interference have been performed by EMI receivers operating in the frequency domain. Radiated emission measurements according to CISPR 16-2-3 are carried out below 1 GHz on open area test sites or in anechoic chambers with a conducting floor. Above 1 GHz, the measurements are carried out with a non-reflecting floor. The emission measurements are performed at several heights and angular positions to measure the maximum interference. Typical distances between the device under test and the antenna for measurements are 10 m for the frequency range 30 MHz-1 GHz. Time-domain measurements using the short-term fast Fourier transform have been introduced in the standards CISPR 16-1-1 and CISPR 16-2-3. They allow to reduce the test time significantly. Alternative methods, such as the measurement in a GTEM cell at three positions, have been introduced to reduce the test time. However, a drawback of the test methods for radiated emission measurements is the limited characterization of the device under test regarding near- and far-field in a spherical way. In this paper a novel vector near-field scanning system operating in time-domain is presented. Multichannel time domain EMI measurement systems open up new possibilities such as source reconstruction and far field evaluation. Using methods for stochastic electromagnetic field modeling, we present a near field scanning system that allows for source separation.
{"title":"A novel vector near-field scanning system for emission measurements in time-domain","authors":"J. Russer, S. Braun","doi":"10.1109/ISEMC.2012.6351833","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351833","url":null,"abstract":"Traditionally, measurements of electromagnetic interference have been performed by EMI receivers operating in the frequency domain. Radiated emission measurements according to CISPR 16-2-3 are carried out below 1 GHz on open area test sites or in anechoic chambers with a conducting floor. Above 1 GHz, the measurements are carried out with a non-reflecting floor. The emission measurements are performed at several heights and angular positions to measure the maximum interference. Typical distances between the device under test and the antenna for measurements are 10 m for the frequency range 30 MHz-1 GHz. Time-domain measurements using the short-term fast Fourier transform have been introduced in the standards CISPR 16-1-1 and CISPR 16-2-3. They allow to reduce the test time significantly. Alternative methods, such as the measurement in a GTEM cell at three positions, have been introduced to reduce the test time. However, a drawback of the test methods for radiated emission measurements is the limited characterization of the device under test regarding near- and far-field in a spherical way. In this paper a novel vector near-field scanning system operating in time-domain is presented. Multichannel time domain EMI measurement systems open up new possibilities such as source reconstruction and far field evaluation. Using methods for stochastic electromagnetic field modeling, we present a near field scanning system that allows for source separation.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669377","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351688
Da-jeong Eom, S. Kahng, Boram Lee, S. Mok, S. Yoo
A novel planar common-mode current(Ic) and differential-mode current(Id) detector is designed to provide a quick check of Ic and Id from the differential-mode signalling, size-reduction effect and possibility of lower manufacturing cost. This is made possible by implementing a branch-line balun which has metamaterial Composite Right- and Left-Handed(CRLH) 1-layer microstrip- structure phase shifter as small as approximately λg/14. The proposed balun clearly differs from others who meander the delay line or make slits on the metal ground. When the proposed balun is connected to the output ports of the differential-mode signal lines through its inputs Port U and Port L, Id and Ic are obtained at Port Δ and Port Σ of this compact balun, respectively. The design method is validated by the circuit and full-wave simulations(SEMCAD X) with the dispersion diagram showing metamaterial properties of the structure. Also, the even and odd modes in differential-mode signalling are treated as examples of the Ic and Id Detector. The size-reduction effect is addressed also.
{"title":"Novel common-mode current detector using metamaterial CRLH transmission-line structure","authors":"Da-jeong Eom, S. Kahng, Boram Lee, S. Mok, S. Yoo","doi":"10.1109/ISEMC.2012.6351688","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351688","url":null,"abstract":"A novel planar common-mode current(Ic) and differential-mode current(Id) detector is designed to provide a quick check of Ic and Id from the differential-mode signalling, size-reduction effect and possibility of lower manufacturing cost. This is made possible by implementing a branch-line balun which has metamaterial Composite Right- and Left-Handed(CRLH) 1-layer microstrip- structure phase shifter as small as approximately λg/14. The proposed balun clearly differs from others who meander the delay line or make slits on the metal ground. When the proposed balun is connected to the output ports of the differential-mode signal lines through its inputs Port U and Port L, Id and Ic are obtained at Port Δ and Port Σ of this compact balun, respectively. The design method is validated by the circuit and full-wave simulations(SEMCAD X) with the dispersion diagram showing metamaterial properties of the structure. Also, the even and odd modes in differential-mode signalling are treated as examples of the Ic and Id Detector. The size-reduction effect is addressed also.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134539513","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351817
Xiang-hua Wang, W. Yin, Jian Wang
An improved leapfrog alternating-direction (ADI) finite-difference time-domain (FDTD) method is provided for computing surface current distributions of some complex PEC and dielectric composite structures illuminated by an intentional electromagnetic pulse (IEMP). The techniques for introducing into an incident plane wave, updating the iteration equations at the connecting boundaries according to the total and scattered fields, and computing the surface currents are all implemented into the leapfrog ADI-FDTD algorithm. Some numerical results are given to show the predicted surface current distribution of an aircraft model illuminated by an IEMP with different incident directions and polarizations, and good agreement is obtained in comparison with those of the commercial software CST and FEKO.
{"title":"An improved leapfrog ADI-FDTD method for computing surface current distributions of complex structures in the presence of an intentional electromagnetic pulse (IEMP)","authors":"Xiang-hua Wang, W. Yin, Jian Wang","doi":"10.1109/ISEMC.2012.6351817","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351817","url":null,"abstract":"An improved leapfrog alternating-direction (ADI) finite-difference time-domain (FDTD) method is provided for computing surface current distributions of some complex PEC and dielectric composite structures illuminated by an intentional electromagnetic pulse (IEMP). The techniques for introducing into an incident plane wave, updating the iteration equations at the connecting boundaries according to the total and scattered fields, and computing the surface currents are all implemented into the leapfrog ADI-FDTD algorithm. Some numerical results are given to show the predicted surface current distribution of an aircraft model illuminated by an IEMP with different incident directions and polarizations, and good agreement is obtained in comparison with those of the commercial software CST and FEKO.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132582937","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 : 2012-11-12DOI: 10.1109/ISEMC.2012.6351658
Jing Li, Yaojiang Zhang, A. Gafarov, S. De, M. Koledintseva, J. Marchand, D. Hess, T. Durant, E. Nickerson, J. Drewniak, J. Fan
Cables, represented by monopole antennas and coated with magneto-dielectric absorbing materials or containing ferrite cores, can be used to estimate how much electromagnetic interference (EMI) reduction the corresponding coatings cause. Two-dimensional finite element method (2D-FEM) has been developed to calculate the EMI reduction by taking advantage of the axial symmetry of the geometry. A standard technique based on the 7/3-mm coaxial air line and vector network analyzer measurements is used to extract the relative permeability and permittivity of the flexible absorbing materials or ferrites. With the extracted parameters, both the input impedance and the EMI reduction on cables coated with absorbing materials or containing a ferrite choke can be calculated by the 2D-FEM, and the input impedance is also compared with the experiment result. At last, EMI reduction values of absorbing sheet material and ferrite are evaluated by 2DFEM based on realist geometry of cables.
{"title":"EMI reduction evaluation with flexible absorbing materials and ferrite cores applied on cables","authors":"Jing Li, Yaojiang Zhang, A. Gafarov, S. De, M. Koledintseva, J. Marchand, D. Hess, T. Durant, E. Nickerson, J. Drewniak, J. Fan","doi":"10.1109/ISEMC.2012.6351658","DOIUrl":"https://doi.org/10.1109/ISEMC.2012.6351658","url":null,"abstract":"Cables, represented by monopole antennas and coated with magneto-dielectric absorbing materials or containing ferrite cores, can be used to estimate how much electromagnetic interference (EMI) reduction the corresponding coatings cause. Two-dimensional finite element method (2D-FEM) has been developed to calculate the EMI reduction by taking advantage of the axial symmetry of the geometry. A standard technique based on the 7/3-mm coaxial air line and vector network analyzer measurements is used to extract the relative permeability and permittivity of the flexible absorbing materials or ferrites. With the extracted parameters, both the input impedance and the EMI reduction on cables coated with absorbing materials or containing a ferrite choke can be calculated by the 2D-FEM, and the input impedance is also compared with the experiment result. At last, EMI reduction values of absorbing sheet material and ferrite are evaluated by 2DFEM based on realist geometry of cables.","PeriodicalId":197346,"journal":{"name":"2012 IEEE International Symposium on Electromagnetic Compatibility","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131772812","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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