IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility最新文献

{"title":"Reverberating Asymmetric TEM Cell For Radiated EMC/V And SE Testing, 10 KHz-18 GHz","authors":"M. Crawford, B. Riddle","doi":"10.1109/ISEMC.1992.626079","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626079","url":null,"abstract":"This paper describes work in progress at the National Institute of Standards and Technology (NIST) to develop a single, integrated facility for electromagnetic compatibility/vulnerability (EMC/V) and shielding effectiveness (SE) testing over the frequency range of 10 kHz to 18 GHz. The facility consists of an asymmetric (offset center plate) TEM cell, 1.01 m x 1.20 m x 2.98 m in size, with two cavity mode tuners, configured as a TEM transmission line-driven, modestirred chamber. TEM test fields are generated in the chamber at frequencies below multimode cutoff (= 150 MHz), and mode-stirred test fields are generated at frequencies above multimode cutoff. The test volume in the cell is 0.5 m x 0.6 m x 0.6 m. The paper discusses the cell design, advantages and limitations for its use, the theoretical basis for its operation, and the experimental approach for its use in SE or EMC/V testing. Results are given of the evaluation of the cell's operational parameters including VSWR, E-field amplitude versus input power, tuners' effectiveness, and test volume E-field uniformity .","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"59 1","pages":"206-213"},"PeriodicalIF":0.0,"publicationDate":"1992-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74381958","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}

{"title":"Modelling Electromagnetic Radiation From Digital Electronic Systems By Means Of The Finite Difference Time Domain Method","authors":"C. J. RaiIton, K. Richardson, J. Mcgeehan, K. Elder","doi":"10.1109/ISEMC.1992.626046","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626046","url":null,"abstract":"","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"78 1","pages":"38-43"},"PeriodicalIF":0.0,"publicationDate":"1992-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74584713","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}

{"title":"EMI-induced Delays In Digital Circuits: Prediction","authors":"J. Laurin, S. Zaky, K. Balmain","doi":"10.1109/isemc.1992.626140","DOIUrl":"https://doi.org/10.1109/isemc.1992.626140","url":null,"abstract":"A simple model is introduced to predict the changes in propagation delay in a logic inverter caused by low-level radio frequency interference. The change in delay is computed as a function of the induced voltage disturbance, which in turn can be computed from the incident field using linear frequency domain analysis. The model accounts for the dependence of the induced delay on the phase and amplitude of the RFI signal as well as on the slew rate of the logic transitions. Its predictions are shown to be in good agreement with experimental results and Spice simulations for interference frequencies up to the maximum switching frequency of the inverter (in-band interference).","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"47 1","pages":"443-448"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74459795","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}

{"title":"The effect of a finite conductivity ground plane on open area site attenuation","authors":"C. Kraft","doi":"10.1109/ISEMC.1992.626062","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626062","url":null,"abstract":"The FCC and European Community Standards require radiated emission testing to be conducted at an open area test site where the device being tested and the receiving antenna are placed over a metal ground plane. The calibration of this site is called normalized site attenuation and is specified in ANSI Standard 053.4.. The procedure outlined in C63.4 is based on a model with a perfectly (conducting ground plane of infinite extent. This paper addresses the question of the effects of finite conductivity of the real the ground plane on site attenuation. In particular, it describes site attenuation simulations over infinitely large copper and steel planes as well as a soil model. The results show that finite conductivity ground planes are almost as good as infinite ones as long as they are metal.","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"27 1","pages":"131-133"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75350112","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}

{"title":"Cables and Connectors - Their Contribution To Electromagnetic Cohpatibility","authors":"E. P. Fowler","doi":"10.1109/ISEMC.1992.626103","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626103","url":null,"abstract":"","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"21 1","pages":"329-333"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75696968","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}

{"title":"Comparison of gasket transfer impedance and shielding effectiveness measurements - Part I","authors":"G. Freyer, M. Hatfield","doi":"10.1109/ISEMC.1992.626064","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626064","url":null,"abstract":"Several techniques are available to evaluate the shielding performance of various gasket materials and configurations. This work, in two Parts, measured the shielding performance of five gaskets using Transfer Impedance (TI) and Mode Stirred Chamber (MSC) techniques. Part I had two objectives: 1) to investigate the characteristics of a TI fixture from 50 MHz to 18 GHz; and, 2) to measure the transfer impedance of gaskets of varying materials, finishes, and configurations. Part I1 also had two objectives: 1) to measure the shielding effectiveness of the five gaskets using a MSC; and, 2) to compare the results obtained by the two shielding performance techniques.","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"20 1","pages":"139-141"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84402996","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}

{"title":"EMI Potential Of Non-periodic Signals","authors":"Robert","doi":"10.1109/ISEMC.1992.626104","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626104","url":null,"abstract":"Increasing speeds of LANs and microprvcessors require that non-periodic signals such as data line signals, address busses, data busses and control lines be analyzed when assessing the EMI potential of equipment. The power spectrum of these signals consists of the narrowband component which may related to the intrinsic timing information and the broadband component. These are characterized theoretically. The relative magnitude of the spectral components is dependent on the shape of the waveform and its rate relative to the 120 kHz bandwidth of the quasi-peak detector. Return-to-Zero (RZ) and NonReturn-to-Zero (NRZ) signals are presented at 1 Mbitls and 100 Mbitls rates. I. hX’RODUCrrON requires knowledge of the stochastic properties, or equivalently the energy spectrum, of the data stream in addition to the repetition rate, risetime, duty cycle and amplitude of the waveform. The resulting spectral signature is made up of both “broadband” and “narrowband” components as shown in Figure 1. This presents an additional factor in EMI modelThe increasing speeds of electronics technology necessitate the continuous development of analytic techniques to assess the EMI potential of new designs. The analysis of the EMI potential of non-periodic signals is important due to the increasing data rates over twisted pair LAN systems and the increasing operating speeds of microprocessors. This implies extending the complexity of signal modelling beyond the basic level of trapezoidal clock waveforms into the area of random variables and cyclostationary processes [ll. These various non-periodic signals such as data line signals, address busses, data busses and control lines will be referred to generally as “data signals” to distinguish them from clock signals which are usually analyzed in EMI modelling. Non-periodic signals have generally been ignored in EMT analysis. Their intrinsic randomness reduces the interference potential and the consequent threat to compliance with regulatory emissions requirements when compared with the clock signals usually in the same circuitry. Increasing data rates and processing speeds, accompanied by the success of design strategies to reduce the emissions potential of clock signals, have required that this source of emissions be more carefully examined. The spectral signature of a random or quasi-random signal is more complex than that of a clock signal. For the purposes of analysis it may be treated as two distinct parts; one which is due to the intended or idealized data stream and another which is directly attributable to the physical implementation in a circuit. In the latter category parasitic clock signals superimposed on the data line are the most common and significant spectral elements. Either or both of these contributions may be significant in an EMI analysis. The a priori analysis of an idealized non-periodic signal prCq.Sspn:4OMHz-6ohWz M.p.lOdB/div RClBW:l2&Hz Pa.Puk swP2oms Fig. 1. Emissions spectrum of data bus with and","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"13 1","pages":"334-339"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84906693","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}

{"title":"Corrosion Resistant Composite Material For EMI/EMP Hardening Protection In Marine (or Similarly Hostile) Environments","authors":"D. Dixon, M. Obara","doi":"10.1109/ISEMC.1992.626119","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626119","url":null,"abstract":"In I987 ( I ) and 1989 (2) initial results of the electromagnetic interference (EMI) evaluation of aluminum technology and indium tin oxide (1TO)lNi-flake technology were discussed by Dixon and Masi. This study is a continuation of the effort to develop composite materials composed of conducting particles, fibers, or flakes in a matrix of polymeric material for use in shipboard connector and junction box electromagnetic shielding applications. These materials are designed to satisfy a full range of electromagnetic, chemical, and mechanical properties. Particular emphasis was placed on the material's shielding effectiveness against electromagnetic ( E M ) fields, its corrosion resistance to hostile environments and its electrochemical compatibility with connecting enclosures and devices made from aluminum. The ability of the oxides to vary the oxide stoichiometry in the presence of other electrochemical species makes these materials of great interest to the military designer. For example, utilizing nickel shielding material against aluminum cabinets or bulkheads, without the rrelectrochemical protection\" of an oxide material like ITO, will subject these metals to rapid corrosion in the marine environment. Background information and a summary of results is provided on the earlier composite material developmentlevaluation efforts. However, the emphasis of this paper will be to highlight the results of recent electromagnetic pulse (EMP) testing conducted at NUSC on the ITOINi-flake and other selected composite materials. This testing was pelformed using a high level EMP simulator capable of subjecting the cylindrical, lifesaver-shaped composites to a peak current of 150 amperes from a damped cosine waveform generator. The EMP testing has shown that most of the composite materials have their EM performance improved by one to two orders of magnitude (20-40 dB) after proper surface treatment and high level pulsing. This pelformance improvement remains after the removal of the pulsed source, thereby making the phenomenon somewhat analogous to the annealing process used to improve the EM pelformance of various metals.","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"17 1","pages":"366-379"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81213952","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}

{"title":"Modeling the shielding effectiveness of metallized fabrics","authors":"A. R. Henn, R.M. Cribb","doi":"10.1109/ISEMC.1992.626095","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626095","url":null,"abstract":"A semi-empirical model describing the plane wave shielding effectiveness (SE) of metallized fabrics, both woven and non-woven, has been developed. The model incorporates the plane wave shielding theory of homogeneous metal foils, meshes, and thick perforated metal panels into a formulation for predicting the shielding effectiveness of metallized fabrics. Data is presented from 10 MHz to 17 GHz which shows the effects of surface resistivity, maximum fabric pore size, and fabric thickness on the shielding effectiveness of the metallized material. The model predictions are compared to measured data for low copper and high copper content nylon non-woven fabrics.","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"129 1","pages":"283-286"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77766617","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}

{"title":"Antenna patterns of largecurrent radiator and closed-loop sensor","authors":"M. Hussain","doi":"10.1109/ISEMC.1992.626153","DOIUrl":"https://doi.org/10.1109/ISEMC.1992.626153","url":null,"abstract":"An experimental setup of antenna systems for the radiation and reception of ultrawideband nonsinusoidal electromagnetic waves will be described. The radiating antenna is called the large-current radiator and the receiving one the closed-loop sensor. Measured antenna patterns of the large-current radiator and the closed-loop sensor will be presented. The measured antenna patterns are peak-amplitude pattern, peak-power pattern, energy pattern, and slope pattern. Based on the principle of pattern multiplication, the array factor for nonsinusoidal waves is multiplied by the above measured antenna patterns to synthesize antenna beam patterns of an array of large-current radiators and those of an array of closed-loop sensors. The synthesized antenna patterns demonstrate that antenna arrays of large-current radiators and closed-loop sensors are very attractive for achieving good radar resolution.","PeriodicalId":93568,"journal":{"name":"IEEE International Symposium on Electromagnetic Compatibility : [proceedings]. IEEE International Symposium on Electromagnetic Compatibility","volume":"37 1","pages":"494-498"},"PeriodicalIF":0.0,"publicationDate":"1992-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76945464","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}