1978 IEEE International Symposium on Electromagnetic Compatibility最新文献

{"title":"Interactive Graphics for EMC Analysis","authors":"M. Vuille, S. Kubina, H. Widmer","doi":"10.1109/ISEMC.1978.7566877","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566877","url":null,"abstract":"","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121476538","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 Effects on Field Penetration Through Apertures","authors":"G. Kunkel","doi":"10.1109/ISEMC.1978.7566836","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566836","url":null,"abstract":"The penetration of electromagnetic fields through an aperture caused by the faying join of a door or cover in a shielded barrier is dependent upon the conductivity of the join and the size of the aperture. It is common practice to plate the faying surfaces and place an EMI gasket between the joining sur­ faces to increase the conductivity and reduce the effective aperture of the join. In selecting the plating and gasket materials, corrosion control is usually of utmost concern, where the corrosion of concern is usually that which causes deterioration of the structure (i.e., oxidation of the base material). Oxi­ dation of the plating and gasket material can, however, cause the conductivity of the join to increase significantly. As a result, the penetration of electromagnetic fields through the aperture can increase with time as oxi­ dation of the platings and gasket material take place.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122466970","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":"Naval Electromagnetic System Design and Synthesis","authors":"J. Birken","doi":"10.1109/ISEMC.1978.7566872","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566872","url":null,"abstract":"","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128380430","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":"Asymmetric versus Symmetric TEM Cells for EMI Measurements","authors":"M. Crawford, J. Workman","doi":"10.1109/ISEMC.1978.7566855","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566855","url":null,"abstract":"This paper d i s c u s s e s th e o p t io n o f d e s ig n in g a tr a n s v e r s e e le c tr o m a g n e t ic (TEM) tr a n sm is s io n c e l l w ith an o f f s e t septum a s a m u lt ip u rp o se chamber fo r perform ing e le c tr o m a g n e t ic in t e r f e r e n c e (EMI) measure­ m ents. The d e s ig n and e l e c t r i c a l performance charac ­ t e r i s t i c s o f such a c e l l are g iv e n and compared w ith a s im i la r s i z e d symmetric c e l l .","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129509208","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":"Lightning Protection with Segmented Diverters","authors":"J. Plumer, L. Hoots","doi":"10.1109/ISEMC.1978.7566854","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566854","url":null,"abstract":"Segmented d i v e r t e r s a r e d e s i g n e d t o p r o t e c t radomes and o t h e r d i e l e c t r i c s t r u c t u r e s a g a i n s t punc ­ t u r e f rom d i r e c t l i g h t n i n g s t r i k e s . Radar t r a n s p a r e n c y , l i g h t w e i g h t and e a s e o f a p p l i c a t i o n have c r e a t e d much i n t e r e s t i n t h e s e d i v e r t e r s . S e v e r a l t e s t s e r i e s were pe rform ed t o o b t a i n d a t a f o r u se i n a p p l i c a t i o n . I t was l e a r n e d t h a t t im e t o f l a s h o v e r i s 0 . 7 p s p e r m e t e r o f s t r i p l e n g t h and i s i n d e p e n d e n t o f r a t e o f r i s e w i th ­ i n t h e r a n g e o f r a t e s t h o u g h t t o be t y p i c a l o f l i g h t ­ n i n g . P r o t e c t i o n e f f e c t i v e n e s s s t ems from t h i s s h o r t f l a s h o v e r t im e as compared w i th t h a t f o r a i r o r s o l i d d i e l e c t r i c s . Segmented d i v e r t e r f l a s h o v e r v o l t a g e i s d e p e n d e n t on s t r i p l e n g t h and r a t e o f v o l t a g e r i s e , w i t h f l a s h o v e r o c c u r r i n g a t 500 kV/m when t e s t e d a t t h e cus to mary 1 , 00 0 kV/us r a t e . T e s t s t o d e t e r m i n e s p a c in g r e q u i r e d t o p r e v e n t p u n c t u r e o f a radome wa l l w i t h an a n t e n n a beh in d i t a r e d e s c r i b e d . 30 cm sp a c in g was r e q u i r e d f o r a n t e n n a t o w a l 1 c l e a r a n c e o f 1 . 5 cm b u t d i v e r t e r s may be p l a c e d up t o 60 cm a p a r t i f t h e a n t e n n a i s 15 cm f rom t h e w a l l . A s u c c e s s f u l i n f l i g h t s t r i k e t o an a r r a n g e m e n t based on t h i s d a t a i s d e s ­ c r i b e d .","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129473196","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 Hazard Assessment Method for the U.S. Army Microwave Radiation Protection Program","authors":"E. Carl","doi":"10.1109/ISEMC.1978.7566826","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566826","url":null,"abstract":"A combination of assessment of hazard potential by analysis and measurement by experienced antenna engineers, and implementation of recommendations made by the U.S. Army Environmental Hygiene Agency (USAEHA) is the backbone of the Army Microwave Radiation Protection Program. Primary responsibility for establishing safety criteria and recommending controls is assigned to USAEHA. By establishing radiation protection programs based on the Agency's recommendations, commanders have sought to comply with the Army's regulations and protect their personnel from continuous exposure to microwave power density levels in excess of 10 mW/cm2, or any exposure to greater than 100 mW/cm2; the current U.S. Standard. Following the Federal Standard, the Army controls exposure from frequencies of 10 MHz and up. Sources include radar, communication equipment, physical therapy RF and microwave diathermy, industrial induction heaters, and microwave ovens and cooking devices.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116685663","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":"Measurements of the HF Radio Noise Environment in Arctic Canada","authors":"W. Lauber, C. Pike","doi":"10.1109/ISEMC.1978.7566885","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566885","url":null,"abstract":"Measurements of the HF radio noise environment were made at Alert and Inuvik in the Canadian Arctic in 1977. The measurements were taken in the 8:0012:00 hour and 20:00-24:00 hour local standard time periods. The Alert measurements were taken in June, a period of total daylight. The Inuvik measurements were taken in October when the 20:00-24:00 hour data period occurred after sunset. The results of the night measurements at both sites compared favourably with the CCIR predictions and the day results showed that the Quiet Receiving Site Line, used in the South, was an accurate prediction at Inuvik but it predicted levels too high at the quiet location at Alert. The measurements taken in the town of Inuvik showed higher levels of man-made noise that were comparable to a \"rural location\" as defined in CCIR Report 258. Measurements at these high latitude sites revealed limitations in the sensitivity of the measuring equip­ ment . where 10 log f","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127121431","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":"Broadband Null-Steering for Signal-Matched Antenna Arrays","authors":"D. Cheng, F. Tseng","doi":"10.1109/ISEMC.1978.7566891","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566891","url":null,"abstract":"A method for creating and steering a pattern null for a broadband signal-matched array antenna is discussed. This null-steering capability is of great importance in avoiding interference and jamming. Typical pattern responses to impulse noise are given and transient effects are examined. Introduction An important advantage of an array antenna sys­ tem over a reflector antenna is the former's ability to create a pattern null in a specified direction. This null-steering capability is of great value in a jamming environment and in locations where unwanted interfering signals may exist. Adaptive control net­ works can be designed to steer the nulls of a CW single-frequency array onto jamming and/or interfer­ ing sources on a real-time basis so that the proba­ bility of detecting the desired signal is enhanced.^ However, little information is available on the feasibility of null-steering for broadband operations for which narrow-band filters and phase-shifters will not suffice. This paper proposes a method for cre­ ating and steering a pattern null for a linear array with a matched filter which is designed to match radar pulses with a linear frequency modulation. The basic principle lies in the use of doublet elements. Each doublet consists of two elements separated by an appropriate distance. The output of one of the elements is delayed in time before it is combined with that of the other in order to create a null in the array pattern. A jamming interference impinging on the array at the designed null direction will yield no output under ideal conditions. The null direction can be relocated by changing the time delay between the elements of the doublets. Typical array patterns in response to an impulse noise are plotted for a signal-matched Chebyshev array consist­ ing of 40 doublet elements in the transient state. Linear Array with Matched Filter Consider a linear array of 2N isotropic elements spaced at distances + x^, +\"X2 >..., + from the array center 0, as shown in Fig. 1. The array is in a receiving mode with amplitude weighting factors I , n = + 1, +2,..., + N. The incoming signal s(t) is assumed to have a rectangular frequency spectrum centered at w with a bandwidth 2yw and the transfer o o function, H(jw), of the matched filter is the complex conjugate of signal spectrum S(jw). The time delays, T , are provided to steer the mainbeam direction of n the array pattern. If the signal is a pulse with a linear frequency modulation, we have In Eq. (1), to + (J) . . H(jto) = S*(jco) = Rect ( 2 ■ °)e~~|Ct ' o Rect (y) = l , f < y < ","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130758987","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 Review of Electromagnetic Diffraction by Small Apertures in Conducting Surfaces","authors":"C. Butler","doi":"10.1109/ISEMC.1978.7566834","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566834","url":null,"abstract":"Simple methods for computing electromagnetic dif­ fraction by small apertures in conducting surfaces are reviewed, with an attempt to present the concepts tutorially so that this body of knowledge is rendered accessible to practicing engineers. Representation of the field diffracted by a small aperture in a screen by means of equivalent dipoles is discussed and salient properties of the associated aperture polarizabilities are outlined.","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124351362","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":"Prediction of Crosstalk Involving Twisted Pairs of Wires a Simplified, Low Frequency Prediction Model","authors":"C. Paul, J. McKnight","doi":"10.1109/ISEMC.1978.7566823","DOIUrl":"https://doi.org/10.1109/ISEMC.1978.7566823","url":null,"abstract":"A simplified model for predicting crosstalk invol­ ving twisted wire pairs which is valid for low fre­ quencies is developed. The total coupling is separated into inductive and capacitive coupling contributions. The capacitive coupling contribution is shown to pro­ vide a \"floor\" which limits the effect of reducing the inductive coupling achieved by twisting a wire pair. These contributions are computed from Fig. 2 where and Cjj are the mutual inductance and capacitance, re­ spectively, between the two circuits, and Igpg and Vqjjq are the generator circuit current and voltage, respec­ tively, which are Computed for zero frequency of excita­ tion [2 ].","PeriodicalId":377995,"journal":{"name":"1978 IEEE International Symposium on Electromagnetic Compatibility","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115496824","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}