摘要
针对导电板覆盖的开孔矩形腔体,比较了SE_i、SE_a、SE_m3种屏蔽效能(SE_i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,SE_a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,SE_m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,SE_i受这两个因素的影响很明显,SE_a受到的影响相对较小,而SE_m几乎没有受到影响,且SE_m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。
Three different definitions of shielding effectiveness for a shielding box with an aperture covered by conductive sheet are considered： i. e. the shielding effectiveness SEiwith the incident field taken as reference field,SEawith the penetration field in case of the aperture opened as reference field,and SEmwith 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 SEiis affected strongly by the two factors,SEais affected comparatively lessand SEmishardly influenced. Especially, SEmcan 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.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第1期112-118,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51307055)
国家电网公司项目(SGRI-WD-71-12-009)资助
关键词
电磁屏蔽
屏蔽效能
屏蔽腔体
开孔
导电材料
Electromagnetic shielding
shielding effectiveness
shielding box
aperture
conductive material
