电工技术学报  2016, Vol. 31 Issue (1): 112-118    DOI:
电磁兼容 |
导电板覆盖的开孔矩形腔体电磁屏蔽效能的比较研究
焦重庆,李顺杰
新能源电力系统国家重点实验室(华北电力大学) 北京 102206
Shielding Effectiveness Comparison of a Rectangular Box with an Aperture Covered by Conductive Sheet
Jiao Chongqing,Li Shunjie
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
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摘要 针对导电板覆盖的开孔矩形腔体,比较了SEiSEaSEm 3种屏蔽效能(SEi为入射场与开孔覆盖导电板时腔体内部某位置的透射场场强大小的比值,SEa为开孔敞开与开孔覆盖导电板时腔体内部同一位置的透射场场强大小的比值,SEm为开孔覆盖参考导电板与开孔覆盖待测导电板时腔体内部同一位置的透射场场强大小的比值)。利用解析理论方法和全波仿真方法计算分析了腔体谐振和观测点位置对3种屏蔽效能的影响规律,两种方法的计算结果一致性良好。结果表明,SEi受这两个因素的影响很明显,SEa受到的影响相对较小,而SEm几乎没有受到影响,且SEm与一个无限大板相对于另一个无限大板的屏蔽效能近似相等,这一特性使其在材料电磁屏蔽效能的评估中有着潜在的应用价值。
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焦重庆
李顺杰
关键词 电磁屏蔽屏蔽效能屏蔽腔体开孔导电材料    
Abstract:Three different definitions of shielding effectiveness for a shielding box with an aperture covered by conductive sheet are considered:i.e.the shielding effectiveness SEi with the incident field taken as reference field,SEa with the penetration field in case of the aperture opened as reference field,and SEm with its reference field defined as the penetration field when a reference sheet employed.Effects of the two factors,cavity resonance and observation point position,are investigated numerically for the three different types of shielding effectiveness.It is shown that SEi is affected strongly by the two factors,SEa is affected comparatively lessand SEm ishardly influenced.Especially,SEm can be explained as the shielding effective of an infinite conductive sheet relative to the other one.This feature makes it very useful for shielding effectiveness evaluation of conductive material.
Key wordsElectromagnetic shielding    shielding effectiveness    shielding box    aperture    conductive material   
收稿日期: 2015-06-25      出版日期: 2016-01-21
PACS: TM15  
基金资助:国家自然科学基金项目(51307055)和国家电网公司项目(SGRI-WD-71-12-009)资助。
通讯作者: 焦重庆 男,1981年生,博士,副教授,研究方向为电磁场理论及其应用和电力系统电磁兼容。E-mail:cqjiao@ncepu.edu.cn     E-mail: lianganglsj@163.com
作者简介: 李顺杰 男,1991年生,硕士研究生,研究方向为电力系统电磁兼容。E-mail:lianganglsj@163.com
引用本文:   
焦重庆,李顺杰. 导电板覆盖的开孔矩形腔体电磁屏蔽效能的比较研究[J]. 电工技术学报, 2016, 31(1): 112-118. Jiao Chongqing,Li Shunjie. Shielding Effectiveness Comparison of a Rectangular Box with an Aperture Covered by Conductive Sheet. Transactions of China Electrotechnical Society, 2016, 31(1): 112-118.
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