On the benefits (if any) of pair twisting in reducing radiated emissions from two-wire cables

Proceedings of IEEE Symposium on Electromagnetic Compatibility Pub Date : 1994-08-22 DOI:10.1109/ISEMC.1994.385602

E. Joffe, A. Axelrod

{"title":"On the benefits (if any) of pair twisting in reducing radiated emissions from two-wire cables","authors":"E. Joffe, A. Axelrod","doi":"10.1109/ISEMC.1994.385602","DOIUrl":null,"url":null,"abstract":"An empirical investigation of the effect of cable twisting on the radiated emissions from cables is performed and presented. It is well known that cable twisting is beneficial for reducing the low frequency emissions from, and coupling to cables. However, many misconceptions have evolved with respect to the actual contribution of the cable twisting at high frequencies, in particular with respect to the electric-field and electromagnetic field emission from and coupling to cables. In fact, in certain text books, the \"pair-balance\" is attributed to twisted pairs, contributing a rejection of 20 dB and more. In the present paper, the actual effect of cable twisting on the reduction of radiated emissions due to common-mode and differential-mode fed signals is presented and discussed. Tests were conducted by the authors, in order to investigate the effect of pair twisting on the interference coupling to cables. Due to the duality between emission from- and coupling to cables, the results obtained by means of measurement of the field emission from the cables for common-mode and differential mode feed to the culprit cable can be applied for the estimation of the effect of twisting on the coupling to the cables of the system. It is clearly shown that for high frequency common mode emissions, absolutely no reduction in radiated emissions may be expected due to the pair-twisting. Results are also compared to the those obtained by the shielding of cables, with the shield grounded at one and both sides.<<ETX>>","PeriodicalId":154914,"journal":{"name":"Proceedings of IEEE Symposium on Electromagnetic Compatibility","volume":"6 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1994-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of IEEE Symposium on Electromagnetic Compatibility","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISEMC.1994.385602","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 2

Abstract

An empirical investigation of the effect of cable twisting on the radiated emissions from cables is performed and presented. It is well known that cable twisting is beneficial for reducing the low frequency emissions from, and coupling to cables. However, many misconceptions have evolved with respect to the actual contribution of the cable twisting at high frequencies, in particular with respect to the electric-field and electromagnetic field emission from and coupling to cables. In fact, in certain text books, the "pair-balance" is attributed to twisted pairs, contributing a rejection of 20 dB and more. In the present paper, the actual effect of cable twisting on the reduction of radiated emissions due to common-mode and differential-mode fed signals is presented and discussed. Tests were conducted by the authors, in order to investigate the effect of pair twisting on the interference coupling to cables. Due to the duality between emission from- and coupling to cables, the results obtained by means of measurement of the field emission from the cables for common-mode and differential mode feed to the culprit cable can be applied for the estimation of the effect of twisting on the coupling to the cables of the system. It is clearly shown that for high frequency common mode emissions, absolutely no reduction in radiated emissions may be expected due to the pair-twisting. Results are also compared to the those obtained by the shielding of cables, with the shield grounded at one and both sides.<>

查看原文本刊更多论文

论双绞线在减少双线电缆的辐射发射方面的好处(如果有的话)

本文对电缆扭转对电缆辐射发射的影响进行了实证研究。众所周知，电缆扭转有利于减少电缆的低频发射和耦合。然而，关于高频电缆扭曲的实际贡献，特别是关于电缆的电场和电磁场发射及其耦合，已经产生了许多误解。事实上，在某些教科书中，“对平衡”归因于双绞线，贡献了20 dB甚至更多的拒绝。本文提出并讨论了电缆扭转对减少共模和差模馈电信号的辐射发射的实际影响。为了研究双绞线对电缆干扰耦合的影响，作者进行了试验。由于同轴和耦合对电缆的发射具有对偶性，通过测量同轴电缆和差模馈电电缆的场发射得到的结果可用于估计扭扭对系统电缆耦合的影响。结果清楚地表明，对于高频共模发射，由于对扭转，辐射发射绝对不会减少。并与屏蔽电缆单侧接地和两侧接地的结果进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Proceedings of IEEE Symposium on Electromagnetic Compatibility

自引率

0.00%

发文量