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| Research on the Variation of Shielding Effectiveness of Double-Layer Shielding Enclosure with the Position and Number of Apertures |
| Zhang Yan1,2, Tian Zheng1, Wang Chuanchuan3, Yang Qingxi2, Wang Sifei1 |
1.School of Electrical Engineering Hebei University of Science and Technology Shijiazhuang 050018 China;
2. National Key Laboratory of Strong Electromagnetic Environmental Effects Army Engineering University(Shijiazhuang Campus) Shijiazhuang 050003 China;
3. State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang 471003 China |
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Abstract The position and number of apertures affect the electromagnetic wave diffraction, and then have an important impact on the shielding effectiveness of the double-layer enclosure. Based on Robinson equivalent circuit method and electromagnetic topology theory (EMT), the modified Baum-Liu-Tesche (BLT) equation for calculating shielding effectiveness of double-layer shielding enclosure under plane wave irradiation is derived. By introducing the eccentricity coefficient Cm and the impedance of Robinson aperture array into the BLT equation, it can be used to calculate the shielding effectiveness of double-layer enclosure with arbitrary aperture position and number. Simulation results show that the shielding effectiveness of the double-layer enclosure decreases with the increase of the overlap area of the inner and outer apertures. When the area is fixed, the shielding effectiveness increases with the increase of the number of apertures, but when the aperture length is equal to the wavelength, the shielding effectiveness reaches a minimum. The calculation results of modified BLT equation are consistent with the CST simulation results, and the calculation time is greatly reduced, which validates the modified BLT equation.
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Received: 02 July 2021
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| Fund:国家自然科学基金（61801480）、河北省自然科学基金（E2019208443）、河北省高等学校科学技术研究项目（ZD2021202）和陆军工程大学基础前沿创新项目资助 |
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2022, Vol. 37 
