Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566943
C. K. Jackson
This paper addresses altering electromagnetic emission and susceptibility testing methods for adaptation to frequency hopped spread spectrum communication systems. A discussion of the nature of the interference introduces the subject. Various problems associated with emission and susceptibility testing techniques when applied to. frequency hopped systems are discussed. Expansion of normal defini tions and methods associated with electromagnetic compatibility testing are indicated.
{"title":"Electromagnetic Compatibility Testing of Spread Spectrum Communication Systems","authors":"C. K. Jackson","doi":"10.1109/ISEMC.1985.7566943","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566943","url":null,"abstract":"This paper addresses altering electromagnetic emission and susceptibility testing methods for adaptation to frequency hopped spread spectrum communication systems. A discussion of the nature of the interference introduces the subject. Various problems associated with emission and susceptibility testing techniques when applied to. frequency hopped systems are discussed. Expansion of normal defini tions and methods associated with electromagnetic compatibility testing are indicated.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"80 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":"117137343","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7566944
G. K. Chan
This pape r d e s c r i b e s a p r a c t i c a l c u l l i n g s t r a t e g y to a s s i s t f r e q u e n c y a s s i g n m e n t s for Land M o b i l e ra d i o s y s t e m s in the t w o s i g n a l third-order receiver i n t e r m o d u 1 at i o n i n t e r f e r ence analysis. This strategy is used to identify the potential conflict s i t u a t i o n s w h i c h have a r e l a t i v e l y hig he r p r o b a b i l i t y of interference so that the number of calculations that have to be performed in an interference analysis may be m i n i m i z e d . The r e s u l t s of the a n a l y s i s are presented on a graph depicting the relationship between the two culling limits of distance and fre qu enc y separation.
这个pape b r c d e s r i c t e p a s r i c a c l u l l i - n - g s t r a t g e y to a s s i s t f r e q u e n c y a s s i g n m e n t s for Land o b i l e d ra o s y e s t m s《w t o s i g r n a l third-order接收器n t e m o d u 1 at i o n i n t e f r e r -进发分析。这个会习惯透露是潜在的冲突s t u a t我i o n s w h a c h有r e l a t v b e l y hig他r p r o a b i l i t y的interference如此那calculations当家》,以至于不得不be performed in an interference分析可能我n m i z e d。我所展示的是两种文化限制之间的关系，以及两种文化之间的关系。
{"title":"A Practical Culling Strategy to Assist Frequency Assignment for Land Mobile Radio Systems","authors":"G. K. Chan","doi":"10.1109/ISEMC.1985.7566944","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566944","url":null,"abstract":"This pape r d e s c r i b e s a p r a c t i c a l c u l l i n g s t r a t e g y to a s s i s t f r e q u e n c y a s s i g n m e n t s for Land M o b i l e ra d i o s y s t e m s in the t w o s i g n a l third-order receiver i n t e r m o d u 1 at i o n i n t e r f e r ence analysis. This strategy is used to identify the potential conflict s i t u a t i o n s w h i c h have a r e l a t i v e l y hig he r p r o b a b i l i t y of interference so that the number of calculations that have to be performed in an interference analysis may be m i n i m i z e d . The r e s u l t s of the a n a l y s i s are presented on a graph depicting the relationship between the two culling limits of distance and fre qu enc y separation.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"56 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":"114679841","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7566927
J. A. Cameron
{"title":"Self-Integrating Magnetic Field Sensors","authors":"J. A. Cameron","doi":"10.1109/ISEMC.1985.7566927","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566927","url":null,"abstract":"","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"54 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":"122163058","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7566988
J. Knapp, Frank L. Rose
Part 15 of the Federal Communications Commission Rules and Regulations sets forth the technical and operational requirements for radio frequency devices. Basically, these rules deal with two areas. First, Part 15 provides for operation of low power transmitters without a radio station license. Second, these rules set forth requirements designed to control interference to authorized radio communication services that can be caused by equipment that emits radio frequency energy or noise as a by-product of its operation. This paper (1) briefly summarizes the history behind these rules, (2) outlines what the present rules are, and (3) examines ways in which the rules might be revised in the future to remove unnecessary restrictions to new devices and technologies, while simultaneously providing continued assurance that authorized radio communications will be adequately protected against radio interference. I S i E S S l H S i i S Q Part 15 of the Federal Communications Commission Rules and Regulations sets forth technical and operational requirements dealing with devices which emit radio frequency energy, termed “radio frequency (RF) devices." ill Radio frequency energy is defined as electromagnetic energy at any frequency in the radio spectrum between 9 kHz and 3,000,000 MHz. The rules serve a twofold purpose. First, they provide for operation of low power transmitters without a radio station license, subject to the conditions that (1) such operation may not cause harmful interference to authorized radio services and (2) all interference received must be accepted. Second, Part 15 sets forth provisions for control of interference caused by equipment which generates noise in the course of its operation. The Part 15 rules as they stand today have evolved over the course of nearly 50 years. The regulations have served well in controlling interference and have permitted the development of low power transmitters for a wide variety of applications, from * _ TRe auTRors a r e m e iB e r s ~ o f EResEaTT o l t h e O f f i c e o f S c ie n c e and T e c h n o lo g y o f th e F e d e r a l Com m unicat ions Comm ission, W asw h in g ton , D .C . The o p i n io n s e x p r e s s e d in t h i s p a p e r a r e th o s e o f th e a u t h o r s and may n o t n e c e s s a r i l y r e f l e c t th o s e o f th e Commission o r o t h e r s t a f f members. hobbyist devices such as walkie-talkies and radio controlled toys, to devices which have become a part of our everyday lives such as garage door opener controls and cordless telephones. Over the years, the regulations have been reviewed, either in whole or In part, on many occasions. For a number of reasons, on which we will elaborate later in this paper, the time once again appears to be ripe to reexamine these rules, with the aim of removing unnecessary obstacles to new devices, and also, to reduce the burden of the rules where appropriate. These objectives must be accomplished without compromising the underlying
美国联邦通信委员会规则和条例第15部分规定了射频设备的技术和操作要求。基本上，这些规则涉及两个方面。首先，第15部分规定了在没有无线电台许可证的情况下操作低功率发射机。其次，这些规则规定了一些要求，旨在控制设备在运行过程中产生的射频能量或噪音对授权无线电通信服务造成的干扰。本文(1)简要总结了这些规则背后的历史，(2)概述了目前的规则是什么，(3)研究了未来可能修订规则的方法，以消除对新设备和技术的不必要限制，同时提供持续的保证，授权的无线电通信将得到充分保护，免受无线电干扰。美国联邦通信委员会规则和条例第15部分规定了有关发射射频能量的设备的技术和操作要求，称为“射频(RF)设备”。射频能量被定义为无线电频谱中9khz至3,000,000 MHz之间任何频率的电磁能量。这些规则有双重目的。首先，它们规定在没有无线电台许可证的情况下运行低功率发射机，但必须满足以下条件:(1)这种操作不会对授权的无线电业务造成有害干扰;(2)必须接受接收到的所有干扰。第二，第15部分规定了控制在其运行过程中产生噪声的设备所造成的干扰。今天的第15部分规则已经发展了近50年。规定了在控制干扰和允许低功率发射机的发展对于各种各样的应用程序,从* _ TRe auTRors r e m e iB e r s ~ l o f EResEaTT o t h e o f f i c e o f s c ie n c t e和e c h n o lo g y o f th e f e d e r l Com m unicat离子通讯探险任务,W反潜战h g吨,d . c。o p i n io n s e x p r e s s e d t h i p s p e r r e th o s e o f th e u t h o r s和可能n o t n e c e s s r l y r e f l e c t th o s e o f th e委员会o r o t h e r s t f f成员。业余爱好者的设备，如对讲机和无线电控制的玩具，到已经成为我们日常生活的一部分的设备，如车库门打开器和无绳电话。多年来，这些规定在许多场合被全部或部分地审查过。由于一些原因，我们将在本文后面详细说明，重新审查这些规则的时机似乎再次成熟，目的是消除新设备的不必要障碍，并在适当情况下减轻规则的负担。实现这些目标必须不损害保护无线电通信不受无线电干扰的基本原则。我们希望在一开始就强调，本文所表达的观点仅仅是作者的观点，并不一定代表联邦通信委员会的观点。我们发表这篇论文有很多原因。首先，我们要提请注意在将现行规则和过去的政策适用于新的和不久将开发的各种设备方面所遇到的一些困难。其次，我们希望与公众，特别是EMC社区分享我们和委员会其他成员一直在考虑的修订第15部分的可能框架的一些想法，这些想法将删除不必要的法规，减轻公众的负担，并消除新产品和创新技术的不必要障碍。最后，但也许是最重要的，我们寻求就如何最好地实现上述目标激发讨论和思考。这是出于这些意图
{"title":"A Case For Revising the FCC Regulations Governing Radio Frequency Devices","authors":"J. Knapp, Frank L. Rose","doi":"10.1109/ISEMC.1985.7566988","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566988","url":null,"abstract":"Part 15 of the Federal Communications Commission Rules and Regulations sets forth the technical and operational requirements for radio frequency devices. Basically, these rules deal with two areas. First, Part 15 provides for operation of low power transmitters without a radio station license. Second, these rules set forth requirements designed to control interference to authorized radio communication services that can be caused by equipment that emits radio frequency energy or noise as a by-product of its operation. This paper (1) briefly summarizes the history behind these rules, (2) outlines what the present rules are, and (3) examines ways in which the rules might be revised in the future to remove unnecessary restrictions to new devices and technologies, while simultaneously providing continued assurance that authorized radio communications will be adequately protected against radio interference. I S i E S S l H S i i S Q Part 15 of the Federal Communications Commission Rules and Regulations sets forth technical and operational requirements dealing with devices which emit radio frequency energy, termed “radio frequency (RF) devices.\" ill Radio frequency energy is defined as electromagnetic energy at any frequency in the radio spectrum between 9 kHz and 3,000,000 MHz. The rules serve a twofold purpose. First, they provide for operation of low power transmitters without a radio station license, subject to the conditions that (1) such operation may not cause harmful interference to authorized radio services and (2) all interference received must be accepted. Second, Part 15 sets forth provisions for control of interference caused by equipment which generates noise in the course of its operation. The Part 15 rules as they stand today have evolved over the course of nearly 50 years. The regulations have served well in controlling interference and have permitted the development of low power transmitters for a wide variety of applications, from * _ TRe auTRors a r e m e iB e r s ~ o f EResEaTT o l t h e O f f i c e o f S c ie n c e and T e c h n o lo g y o f th e F e d e r a l Com m unicat ions Comm ission, W asw h in g ton , D .C . The o p i n io n s e x p r e s s e d in t h i s p a p e r a r e th o s e o f th e a u t h o r s and may n o t n e c e s s a r i l y r e f l e c t th o s e o f th e Commission o r o t h e r s t a f f members. hobbyist devices such as walkie-talkies and radio controlled toys, to devices which have become a part of our everyday lives such as garage door opener controls and cordless telephones. Over the years, the regulations have been reviewed, either in whole or In part, on many occasions. For a number of reasons, on which we will elaborate later in this paper, the time once again appears to be ripe to reexamine these rules, with the aim of removing unnecessary obstacles to new devices, and also, to reduce the burden of the rules where appropriate. These objectives must be accomplished without compromising the underlying ","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"4 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":"122326045","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7566999
R. Haislmaier, J. Garrett, G. D. Johnston
EMI control training forms the lynch pin in the the Navy program to institutionalize EMC and EMI control. Two types of training are being developed for the military and civilian communities: EMI awareness training and EMI control skill training. General EMI awareness training provides a perception of the electromagnetic environment and its effects. It consists of oneand two-hour instructional modules in ongoing Navy and Marine Corps training courses, and in civilian technical seminars. Fourteen multi-media EMI awareness training modules make possible turnkey insertion into more than 100 scheduled courses for enlisted and officer personnel in the air, surface, submarine, and Marine Corps communicationelectronics specialties. Specific EMI control skill training is being established in three courses for management schools, for shipyards, and for fleet training centers. Civilian technical training offers thirteen seminars, varying in length from two hours to two days, to provide Naval systems commands, laboratories, ship yards, and test and certification activities with awareness, indoctrination, and technical skills for achieving EMC and minimizing EMI during the development of Navy platforms and systems.
{"title":"EMI Control Training in the Navy","authors":"R. Haislmaier, J. Garrett, G. D. Johnston","doi":"10.1109/ISEMC.1985.7566999","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566999","url":null,"abstract":"EMI control training forms the lynch pin in the the Navy program to institutionalize EMC and EMI control. Two types of training are being developed for the military and civilian communities: EMI awareness training and EMI control skill training. General EMI awareness training provides a perception of the electromagnetic environment and its effects. It consists of oneand two-hour instructional modules in ongoing Navy and Marine Corps training courses, and in civilian technical seminars. Fourteen multi-media EMI awareness training modules make possible turnkey insertion into more than 100 scheduled courses for enlisted and officer personnel in the air, surface, submarine, and Marine Corps communicationelectronics specialties. Specific EMI control skill training is being established in three courses for management schools, for shipyards, and for fleet training centers. Civilian technical training offers thirteen seminars, varying in length from two hours to two days, to provide Naval systems commands, laboratories, ship yards, and test and certification activities with awareness, indoctrination, and technical skills for achieving EMC and minimizing EMI during the development of Navy platforms and systems.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"29 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":"122676501","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7567006
Glen Dash
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Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566937
G. Pettit, C. J. Grebenkemper
In 1981, Tandem constructed a semi-anechoic chamber with the goal of testing small systems and peripheral devices for compliance with the FCC limits for Class A (Commercial) computing equipment. This chamber, provided by Scientific Hardware, is 15.24 meters (50 feet) long, 9.92 meters (.26 feet) wide and 3.66 meters (12 feet) high (steel dimensions). RF absorber cones, provided by Advanced ElectroMagnetics Inc., ranging in length from .61 to 1.22 meters (2 to 4 feet), are mounted on the walls and ceiling with the 1.22 meter cones mounted in the center of the chamber (point of maximum reflection) and shorter cones at either end. The chamber saw little use other than for conducted emissions testing for some period of time due to a lack of knowledge about its correlation to an open field test site.
{"title":"Calibration of a Semi-Anechoic Chamber for FCC Open Field Site Radiated Emissions Measurements","authors":"G. Pettit, C. J. Grebenkemper","doi":"10.1109/ISEMC.1985.7566937","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566937","url":null,"abstract":"In 1981, Tandem constructed a semi-anechoic chamber with the goal of testing small systems and peripheral devices for compliance with the FCC limits for Class A (Commercial) computing equipment. This chamber, provided by Scientific Hardware, is 15.24 meters (50 feet) long, 9.92 meters (.26 feet) wide and 3.66 meters (12 feet) high (steel dimensions). RF absorber cones, provided by Advanced ElectroMagnetics Inc., ranging in length from .61 to 1.22 meters (2 to 4 feet), are mounted on the walls and ceiling with the 1.22 meter cones mounted in the center of the chamber (point of maximum reflection) and shorter cones at either end. The chamber saw little use other than for conducted emissions testing for some period of time due to a lack of knowledge about its correlation to an open field test site.","PeriodicalId":256770,"journal":{"name":"1985 IEEE International Symposium on Electromagnetic Compatibility","volume":"84 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":"126209715","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7566997
D. Merewether
A new des ign f o r a k n i f e edge door sea l i s d e s c r ib e d in which an a d d i t i o n a l impedance i s i n t r o duced in t o th e e q u i v a l e n t c i r c u i t f o r th e .d o o r s e a l . This r e s u l t s in a v o l t a g e d i v i d e r a c t io n t h a t r e duces th e v o l t a g e a c ro s s th e crack around the s h i e ld e d s i d e o f th e door . INTRODUCTION The k n i f e edge door sea l has become the s t a n dard c o n s t r u c t io n p r a c t i c e f o r h ig h q u a l i t y s h i e ld e d en c lo su re s (F igure 1) . The rece s sed sp r in g f i n g e r s t r i p s a r e p r o t e c t e d from ph ys ica l damage, and th e wiping c o n t a c t o f t h e sp r in g f i n g e r s and the k n i f e edge p rov ide a s e l f c l e a n i n g a c t io n t h a t r e s u l t s in high l e v e l s o f a t t e n u a t i o n wi th minimal main tenance . T y p ic a l l y , a k n i f e edge door w i th minimal maintenance w i l l p rov ide abou t 80 dB of p laae wave a t t e n u a t i o n a t 2 .5 GHzCl] and somewhat l e s s a t 10 GHz. Figure 1. Knife Edge Door Seal For high q u a l i t y permanently i n s t a l l e d e n c l o s u r e s , h ig h e r a t t e n u a t i o n l e v e l s a r e d e s i r e d — 100 to 120 dB and so t h e r e i s a need to develop b e t t e r RF door s e a l s t h a t r e l i a b l y ach ieve high l e v e l s o f a t t e n u a t i o n w i th o u t s i g n i f i c a n t main tenance . This has been th e goal o f bur work on th e v o l t a g e d i v i d e r door s e a l . THEORY I t i s a s imple m a t te r to i d e n t i f y th e equ iv a l e n t c i r c u i t f o r a two-dimensional k n i f e edge door sea l (F igure 2 ) . The i n c id e n t e l e c t ro m a g n e t ic f i e l d induces a c u r r e n t t h a t i s a t tem p t in g to flow over t h a t door sea l from p o in t s A to C. A v o l t a g e w i l l be developed a c ro s s th e gap in th e metal be tween p o in t s A and C. E s s e n t i a l l y , t h i s same v o l ta g e appears between p o in t s B and D. Of co u rs e , i t i s t h i s v o l t a g e t h a t de te rmines the f i e l d s on the o p p o s i t e s i d e o f the door. The s h i e ld i n g e f f e c t i v e n e s s o f th e door i s de termined by the impedance o f th e sp r in g f i n g e r s r e l a t i v e to the i n s id e and o u t s id e s l o t impedances. The v o l t a g e d i v i d e r door sea l i s d i f f e r e n t in t h a t a o e r ip h e ra l gap i s in t roduced between p o in t s A and B. This gap le ad s in t o a small c a v i t y f i l l e d w i th RF ab so rb e r m a te r i a l (F igure 3 ) . This m o d i f i c a t i o n in t ro d u c e s an impedance Zgap in t o the e q u i v a l e n t c i r c u i t between nodes A and B. This impedance cau ses a v o l t a g e d iv i d e r a c t i o n to be o b ta in e d . The v o l t a g e a c ro s s the in s id e gap i s lower than th e vo l t ag e a c ro s s the o u t s i d e gap.
在des外来者f o k n和l e d s edge风sea - r i c和d在该an d d t或l impedance s i n t r - duced公吨或th和q u v号l和t c r c u t f或th和d r或s和l。这个r和s u v t s或l t a g和d v d和r a c t我n t h t r和t - duces th和v或g和c罗s th和快客ld around the c h a和d s d或f th和风。导言The k号f和l目前become The s edge风sea t a - c的标准或n s t u c t n p r a t c和f或r h gl h u l i t y s h i和ld d c s (f igure 1)上。The以及s sed sp g f o n g和p r s t s和p r或t和c t和d from ys ica l的ph值,and th和wiping c o t a c t或f t h e sp r g f的n和r s and The k n f和edge p)外国直接投资a s和l e l和n的n - c t我n t h t g r和s - s在高等t或f l和v o t t和n t u、th minimal main tenance。T - l - l y y p ic, k n f和edge风w i th minimal维修w l l p) fdi abou T 80分贝wave of p laae a T和n T u T 2。5 GHzCl] and somewhat l和s T 10 GHz。图1。希尔小刀Edge风For high q u l i t y permanently i s t l l号和d和c或h - s u r和s, h gl e r t和n t u l和v s和l r和d s r和d—100到120分贝和我t h e r和y s to develop b和t所需要、风s - l s t h t和r和l的l y ach ieve高等l和v - s - t和n u t或f号或w i th或u t g n f i c a main tenance。这目前进球的th和th和t或f . work on a g和d v d和r风d和l。理论- s imple m t t s te r为d和t f,而y th和equ iv号a - l和t c h r u f或r two-dimensional k n y和edge风sea l (f igure 2)。The id号和n c t和l和c t ro m a n和t ic f c r r和d induces m和n - i s t t t h tem p . h t, g“流”t t风sea l from p或t s a到c v。o t a g . w和l l . a be developed c罗s th和th和金属缺口be - tween p t s a和c。e或s - l - l y e s, t h s审查或l - g和p之间的appears或t s B和d . Of co rs和u, t i s t h s或l - g和t h t t de te rmines The f和l d s on The或p p或i t和s d或f《风》。ld The s h和g和f f和c t i v和n和s e或f th风de termined由The impedance或f th和pa r g f r g和s r和l i v和to The s id o和u t s id和s l或t impedances。The v或l t g和d v d和r风sea l s和r和t f t h a或e r ip h和l gap i s t或t s a和B之间的roduced。这差距,但s a small c v t t y f l l和d . w . i th、ab你知道rb e r m a r a l (f igure 3)。这m d或f i c t或t ro d u c和s an impedance Zgap t或l和n r和q u v t c h r u的节点a和B之间。这impedance ses第四a v或l . a t g和d d和r i c t to be或B和d。The v或l t g和c罗s The s id和gap丹丹s下th和ag和c罗- y e s The或u t d和差距。
{"title":"Theory and Application of the Voltage Divider Shielded Door Seal","authors":"D. Merewether","doi":"10.1109/ISEMC.1985.7566997","DOIUrl":"https://doi.org/10.1109/ISEMC.1985.7566997","url":null,"abstract":"A new des ign f o r a k n i f e edge door sea l i s d e s c r ib e d in which an a d d i t i o n a l impedance i s i n t r o duced in t o th e e q u i v a l e n t c i r c u i t f o r th e .d o o r s e a l . This r e s u l t s in a v o l t a g e d i v i d e r a c t io n t h a t r e duces th e v o l t a g e a c ro s s th e crack around the s h i e ld e d s i d e o f th e door . INTRODUCTION The k n i f e edge door sea l has become the s t a n dard c o n s t r u c t io n p r a c t i c e f o r h ig h q u a l i t y s h i e ld e d en c lo su re s (F igure 1) . The rece s sed sp r in g f i n g e r s t r i p s a r e p r o t e c t e d from ph ys ica l damage, and th e wiping c o n t a c t o f t h e sp r in g f i n g e r s and the k n i f e edge p rov ide a s e l f c l e a n i n g a c t io n t h a t r e s u l t s in high l e v e l s o f a t t e n u a t i o n wi th minimal main tenance . T y p ic a l l y , a k n i f e edge door w i th minimal maintenance w i l l p rov ide abou t 80 dB of p laae wave a t t e n u a t i o n a t 2 .5 GHzCl] and somewhat l e s s a t 10 GHz. Figure 1. Knife Edge Door Seal For high q u a l i t y permanently i n s t a l l e d e n c l o s u r e s , h ig h e r a t t e n u a t i o n l e v e l s a r e d e s i r e d — 100 to 120 dB and so t h e r e i s a need to develop b e t t e r RF door s e a l s t h a t r e l i a b l y ach ieve high l e v e l s o f a t t e n u a t i o n w i th o u t s i g n i f i c a n t main tenance . This has been th e goal o f bur work on th e v o l t a g e d i v i d e r door s e a l . THEORY I t i s a s imple m a t te r to i d e n t i f y th e equ iv a l e n t c i r c u i t f o r a two-dimensional k n i f e edge door sea l (F igure 2 ) . The i n c id e n t e l e c t ro m a g n e t ic f i e l d induces a c u r r e n t t h a t i s a t tem p t in g to flow over t h a t door sea l from p o in t s A to C. A v o l t a g e w i l l be developed a c ro s s th e gap in th e metal be tween p o in t s A and C. E s s e n t i a l l y , t h i s same v o l ta g e appears between p o in t s B and D. Of co u rs e , i t i s t h i s v o l t a g e t h a t de te rmines the f i e l d s on the o p p o s i t e s i d e o f the door. The s h i e ld i n g e f f e c t i v e n e s s o f th e door i s de termined by the impedance o f th e sp r in g f i n g e r s r e l a t i v e to the i n s id e and o u t s id e s l o t impedances. The v o l t a g e d i v i d e r door sea l i s d i f f e r e n t in t h a t a o e r ip h e ra l gap i s in t roduced between p o in t s A and B. This gap le ad s in t o a small c a v i t y f i l l e d w i th RF ab so rb e r m a te r i a l (F igure 3 ) . This m o d i f i c a t i o n in t ro d u c e s an impedance Zgap in t o the e q u i v a l e n t c i r c u i t between nodes A and B. This impedance cau ses a v o l t a g e d iv i d e r a c t i o n to be o b ta in e d . The v o l t a g e a c ro s s the in s id e gap i s lower than th e vo l t ag e a c ro s s the o u t s i d e gap.","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":"130304869","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 : 1985-08-01DOI: 10.1109/ISEMC.1985.7566917
M. W. Shores
The design and development of a series of complex electronic systems, each of which would be subjected to severe electromagnetic environment, resulted in the introduction of five uncommon shielding techniques. Most of the techniques were developed with strong emphasis on item cost, simplicity and on the impact of implementation.
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Pub Date : 1985-08-01DOI: 10.1109/ISEMC.1985.7566929
D. Dringenburg, Robert G. Siefker
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