1985 IEEE International Symposium on Electromagnetic Compatibility最新文献

{"title":"The Sensitivity of Demodulation RFI Predictions in Op Amp Circuits to Variations in Model Parameter Values","authors":"Y. Sutu, J. Whalen","doi":"10.1109/ISEMC.1985.7566975","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566975","url":null,"abstract":"The computer program NCAP has been used to predict demodulation RFI effects in operational amplifier (op amp) circuits excited by 50% AM-modulated RF signals over the RF frequency range 0.1 to 400 MHz. The op amp circuit investigated is a unity gain buffer amplifier with 741 bipolar or LF355 JFET—bipolar op amps. The sensitivity of the RFI demodulation predictions to variations in model parameter values has been determined.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"9 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115730019","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":"Coupling to Wire Bundles in Rectangular Cavity","authors":"H. Rahman, J. Perini","doi":"10.1109/ISEMC.1985.7566956","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566956","url":null,"abstract":"The motivation for this work was generated during the EMP testing of a ship. In order to collect data on the p o in ts o f in te r e s t , v o lta g e and c u rre n t probes were installed in hundreds of places in the ship and the data collected was transmitted to a recording station inside a shielded room, located somewhere in the ship. In order to communicate with this recording room, port­ able radios, in the VHF range were used. It surprised the authors that no matter where the transmitter was located, even several decks below the recording room, communication was established with no problem.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125098265","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":"A Method for Predicting Intermodulation Product Levels","authors":"J. L. Smith, P. P. Maia","doi":"10.1109/ISEMC.1985.7566974","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566974","url":null,"abstract":"Recent designs of H F radio transmission systems have employed high power multichannel RF power amplifiers that feed a single broadband antenna system. These amplifier/antenna combinations operate with bandwidths that encompass the entire H F band and simultaneously amplify as many as 20 to 25 independent signals of arbitrary carrier frequency. The advantages of such an H F radio system include more effective utilization of assets, frequency agility, and greater efficiency. Along with the advantages, however, comes an increase in the number of intermodulation (IM) products that are generated when the multiple signals are amplified within the high power multichannel RF amplifier. The system designer must be knowledgeable of the impact of these intermodulation products. He must be able to determine what interference will be caused (if any) and to do this, he must know both the frequency and the level of the intermodulation products. The method for calculating the frequency of intermodulation products is well known. The means for predicting the level of the intermodulation products is less familiar to the system designer, especially when multiple signals of various power levels are involved and when intermodulation products of several orders and types are of concern. This paper introduces a means of providing a cursory prediction of the level of the intermodulation products generated by a high power multi­ channel RF amplifier and makes an effort to contribute to more effective frequency management techniques. D ESC R IPTIO N O F TH E IM PR OD UCT The transfer characteristic of the power amplifier can be expressed in the familiar form of an exponential series: N v0 = 2 an Vj eq. (1 ) n =1 Where v0 is the amplifier output signal, vj is the input signal and an are the non-linearity coefficients. When the input signal, vj, is the sum of several sustained carrier signals, the input voltage will be of the form: J Vj = 2 Ej cos W;t eq. (2 ) i=i When vi is raised to the various exponents as indicated by eq. (1), intermodulation products (IPr) are generated and take the form: IPr A r Kr EA a E g ^ E q 7 cos 27t (oA±|3B±7 C± . . .) t eq. (3 ) where r is the order of the intermodulation product, i.e., r= a + /? + 7 + ... A r is the transfer function coefficient Ea , E b , E c , etc. are the amplitudes of signals A, B, C, etc. Kr is a trigonometric expansion coefficient determined by the type of intermodulation product, (see Table I). If Ar is known, then the level of IP r may be calculated. However, seldom is this the case, and attempts at measuring Ar have been unsuccessful in the past. TH E PR ED IC TIO N FORM U LA We wish to have a means to calculate the amplitude coefficient of IPr without a numerical value for A r. This suggests that a ratio be used. A r appears in every intermodulation product of order r regardless of type, i.e., intermodulation products of type A + B + C , 2A4-B, 3A, etc. all contain the transfer function coefficient, A 3. Therefore, i","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121933833","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":"Electromagnetic Pulse Test Aircraft (EMPTAC) Program","authors":"D. Lawry","doi":"10.1109/ISEMC.1985.7566968","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566968","url":null,"abstract":"","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129520167","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 Effects of Induced Cable Currents on Electric and Magnetic Field Measurements","authors":"J. A. Cameron","doi":"10.1109/ISEMC.1985.7566955","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566955","url":null,"abstract":"","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129316037","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":"How to Protect Hardened Facilities from Very High Level Transients Induced on Power Line by Lightning or EMP","authors":"G. Perroton","doi":"10.1109/ISEMC.1985.7566908","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566908","url":null,"abstract":"In 1 ightning or EMP protection problems it is sometimes necessary to take into account very high level trans­ ients collected by the commercial power line. These high transients may occur in cases of direct lightning strikes on the line, or in cases of EMP due to low altitude burst or ground burst close to the 1 ine. In these cases the classical protection devices are not adequate because in general arresters cannot withstand energies higher than a few tens kJ. The goal of the presentation is to show the limita­ tions of classical protection devices and to present different solutions to solve this problem. 1. LIMITATIONS OF CLASSICAL PROTECTION DEVICES Experience has shown that an effective way to deal with abnormal lightning or EMP overvoltages on power lines is to divert them to earth by the means of surge arresters. Surge arresters are constitued of sparkgaps in series with silicon carbide blocks which form the basis of a non linear resistor so that currents due to the n o r m a l voltage could be extinguished by series gaps while the overvoltages are limited by the much larger currents they can divert to earth. While gaps are able to divert to earth large amount of charge (in terms of coulombs), surge arresters have a lower limit for charge flowing because of energy deposited in the silicon carbide block. This limit in charge flowing capability is also dependent on the number of discharges and time beetween discharges. To increase this capability is not easy because the designer must deal with many parameters such as : functionnal service voltage, time response of the arrester, maximum current discharge withstanding, maximum voltage drop in the arrester when current is f1owing, mechanical and geometrical characteristics taking into account insulation levels, characteristics of the power network (neutral earthing, etc ...). This means that the order of magnitude of charge withstanding of 240/415 V arresters is in general tens of coulombs or in terms of energy tens (up to a few hundreds) of kJ. It is also necessary to take into account that spark gaps and arresters keep some memory of the previous charges that they have had to withstand.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130333282","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":"Communication Satellite System for the Arab State Countries - Arabsat","authors":"M. Samarkandy","doi":"10.1109/ISEMC.1985.7566941","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566941","url":null,"abstract":"It was 14th of April 1976 when all Arab countries agreed to form the \"Arab Satellite Communications Organization\" stationed in its headquarter Riyadh, Saudi Arabia. The main objectives of the organization is to establish, operate and maintain a regional satellite system called \"ARABSAT\" that will provide telecommunication services, sound and television broadcasting for all Arab countires. This paper discusses the operation and technical characteristics of the ARABSAT System. Arab Satellite Communications Organiation (ASCO) On 14th of April 1976, members of the Arab League agreed to form an organization called ASCO (Arab Satellite Communications Organization), stationed in its headquarter Riyad, Saudi Arabia. The organization consists of 21 member countries, headed by Saudi Arabia. They are: The Kingdom of Saudi Arabia, the Libian Arab Republic, The Arab Republic of Egypt, the State of Kuwait, the United Arab Emirates, Lebanon, The State of Qatar, the State of Bahrain, the Hashemite Kingdom of Jordan, the Republic of Iraq, the Democratic Republic of Sudan, the Syrian Arab Republic, the Sultanate of Oman, the Algerian Democratic and Popular Republic, the Arab Republic of Yemen, Tunisia, the Kingdom of Morocco, the Somali Democratic Republic, the Islamic Republic of Mauritania, Palestine and the People's Democratic Republic of Yemen. The objective is to create a regional satellite system for the Arab countries to serve general telecommunication services. The shares of the member states in the organizations is shown in Table I. The organization has a General Assembly, a Board of Directors and an Executive Organ. The General Assembly is the highest authority in the organization and is formed from the Ministers of Communications in charge of telecommunications in the member Arab States or whom they authorize. Table I. SHARES OF THE ARAB STATE COUNTRIES IN \"ASCO\" Arab State Countries Amount of shares {%) Saudi Arabia 26.2 Libya 18.5 Egypt : 10.4 Kuwait 8.3 Egypt 10.4 Lebanon 6.3 Qatar 5.0 Bahrain 4.0 Jordan 3.3 Qatar 5.0 Sudan 2.1 Syri a 1.7 Oman 1.0 Algeria 0.9 Sudan 2.1 Tunisia 0.6 Morocco 0.5 Somalia 0.3 Mauritania 0.2 Sudan 2.1 Yemen (P.D.R.) 0.1 100.0 ARABSAT Satellite System The main objectives of the ASCO organization is to establish, operate and maintain a regional satellite system for the Arab countries called \"ARABSAT\", to serve general telecommunication services such as telephone data transmission, telex and telegraphy, radio and television broadcasting. Societe nationale Industrielle Aerospatiale (SNIAS)-, France in cooperation with its partner Ford Aerospace and Communication Corporation (FACC)-, U.S.A. have submitted a proposal (1) to ASCO for the production and delivery of three communications satellites and the provision of related services.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115879077","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":"Power-Line Harmonic and Noise Reduction Devices: Some Measured Features","authors":"J. M. Clemmensen, R. Ferraro, John D. Meloy","doi":"10.1109/ISEMC.1985.7567001","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7567001","url":null,"abstract":"Power-line conditioners, power-line isolators, and other harmonicand noise-reduction devices are often used where sensitive loads must be protected from sources of excessive harmonics and noise. Several features of these devices are discussed including frequency-dependent attenuation of harmonics and noise, the degree of isolation of load noise from the power line, voltage resonant effects with loading, and unloaded power consumption.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130190670","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 Role of I/O Cable Placement in Measuring Emissions from Computing Equipment","authors":"Glen Dash","doi":"10.1109/ISEMC.1985.7566918","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566918","url":null,"abstract":"T h e e f f e c t o f v a r y i n g t h e p l a c e m e n t o f I / O c a b l e s w h i l e p e r f o r m i n g r a d i a t e d e m i s s i o n m e a s u r e m e n t s t e s t s o n c o m p u t i n g e q u i p m e n t h a s b e c o m e a k i n d o f a p a r a d o x i n t h e EMC c ommu n i t y . F o r a n y o n e w h o h a s o b s e r v e d t h e f a c e o f a s p e c t r u m a n a I y z e r wh i I e mo v i n g I / O c a b l e s , e s p e ­ c i a l l y t h o s e a t t a c h e d t o d e s k t o p c o m p u t i n g e q u i p m e n t , t h e p r o b l e m i s c l e a r . Ra d i a t e d e m i s s i o n s v a r y d r ama t i c a I I y , b y 2 0 dB o r m o r e , w h e n I / O c a b l e s a r e m o v e d f r o m o n e p o s i t i o n t o a n o t h e r . r e l a t i v e l y s m a l l m o v e m e n t s c a n d r a m a t i c c h a n g e s i n e m i s s i o n s , t i m e w h e n s t a n d a r d s c o mm i t t e e s f e v e r i s h l y a b o u t 2 dB e r r o r s i n t h i n g s a s e q u i pme n t c a l i b r a t i o n a t t e n u a t i o n , t h e r o l e t h e s e c o m m i t t e e s h a v e p l a y e d i n Even c a u s e A t i wo r r y such and site s t a n d a r d s d e f i n i n g j u s t h o w I / O c a b l e s s h o u l d b e p o s i t i o n e d w h e n t e s t i n g c o m p u t i n g e q u i p m e n t h a s b e e n p a r a d o x i c a l l y s i l e n t . J u s t h o w c a b l e s s h o u l d b e p o s i t i o n e d i n o r d e r t o a c h i e v e r e p e a t a b l e r e s u l t s w h i c h r e p r e s e n t t h e t r u e i n t e r f e r e n c e c a p a c i t y o f t h e e q u i p m e n t u n d e r t e s t i s , i n t h e a u t h o r ' s o p i n i o n , b y f a r t h e s i n g l e m o s t p r e v a l e n t f a c t o r i n t h e f a i l u r e o f v a r i o u s s i t e s t o r e p r o d u c e eac ' h o t h e r ' s d a t a . Y e t no s t a n d a r d h a s erne r g e d w h i c h f u l l y a n d c l e a r l y d i s c u s s e s t h e p r o c e d u r e s t o b e u s e d , n o r i s t h e r e a n y t h i n g c l o s e t o an a g r e e ­ m e n t o n w h a t f o r m t h o s e p r o c e d u r e s s h o u l d take.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131134327","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":"Highlights of Forthcoming SAE J1507 and a Practical Realization of its Procedures for Radiated Susceptibility Testing of Automotive Systems","authors":"E. Bronaugh","doi":"10.1109/ISEMC.1985.7566986","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566986","url":null,"abstract":"The forthcoming SAE J1507 information report on f a c i l i t i e s and procedures fo r tes ting the suscept­ i b i l i t y (immunity) o f large complex systems to radiated electromagnetic energy is reviewed with the objectives o f h igh lighting potential te s t problems and describing a p rac tica l re a l iz a t io n o f an auto­ mated instrumentation system to perform the tes t in g . SAE J1507 s p e c i f ic a l ly addresses the tes t in g o f oper­ ating motor vehicles including passenger cars, buses, large trucks, e t c . , over the range o f frequen­ cies from 20 MHz to 18 GHz, but the f a c i l i t i e s , tech­ niques and procedures are equally applicable to other large , complex e lec tro n ic and electromechanical systems.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124250014","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}