导电板覆盖的开孔矩形腔体电磁屏蔽效能的比较研究

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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 SE_i with the incident field taken as reference field,SE_a with the penetration field in case of the aperture opened as reference field,and SE_m 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 SE_i is affected strongly by the two factors,SE_a is affected comparatively lessand SE_m ishardly influenced.Especially,SE_m 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 words： Electromagnetic shielding shielding effectiveness shielding box aperture conductive material

Received: 25 June 2015 Published: 21 January 2016

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TM15

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	Jiao Chongqing
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Jiao Chongqing,Li Shunjie. Shielding Effectiveness Comparison of a Rectangular Box with an Aperture Covered by Conductive Sheet[J]. Transactions of China Electrotechnical Society, 2016, 31(1): 112-118.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I1/112

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