基于BLT方程的内置介质板异型腔屏蔽效能

doi:10.19595/j.cnki.1000-6753.tces.191050

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Abstract The outer shape and inner structure will affect the shielding effectiveness (SE) of metallic enclosures. By deriving the scattering parameter of the equivalent circuit at the discontinuous position of the heterotypic enclosure, the analytical models for the SE of an enclosure with convex structure and an enclosure with stepped structure excited by a plane wave are established based on the electromagnetic topology theory and the BLT equation. The effects of the position of the dielectric layer on the SE of the heterotypic enclosure are then analyzed. The analytical model can be used to calculate the SE at any point in the enclosure with arbitrarily positioned aperture by introducing the coefficients of the aperture position and the observation point position. The results show that dielectric layer can effectively suppress the resonance of the heterotypic enclosure, which improves the SE for frequencies near the resonances while less affecting the SE for frequencies far away from the resonances. The optimal layer position exists at different resonance points, thus the SE reaches the maximum value within the interval of the layer position. The analytical results are in good agreement with those of the full-wave simulation software CST, which validates the efficiency of the analytical models. Compared with the numerical methods, the analytical model has higher efficiency and requires less memory, which has guiding significance for the shielding design of heterotypic enclosures.

Key words： Shielding effectiveness (SE) electromagnetic topology (EMT) theory BLT equation heterotypic enclosure dielectric layer

Received: 16 August 2019

PACS:	TM15
	TM25

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	Hao Jianhong
	Jiang Luhang
	Qian Siyang

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Hao Jianhong,Jiang Luhang,Qian Siyang. The Shielding Effectiveness of Heterotypic Enclosures Embedded Dielectric Layers Based on the BLT Equation[J]. Transactions of China Electrotechnical Society, 2020, 35(18): 3791-3801.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191050 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I18/3791

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