中国物理B ›› 2013, Vol. 22 ›› Issue (8): 84101-084101.doi: 10.1088/1674-1056/22/8/084101

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Resonance suppression and electromagnetic shielding effectiveness improvement of an apertured rectangular cavity by using wall losses

焦重庆, 朱弘钊   

  1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
  • 收稿日期:2012-12-16 修回日期:2012-12-31 出版日期:2013-06-27 发布日期:2013-06-27
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51037001).

Resonance suppression and electromagnetic shielding effectiveness improvement of an apertured rectangular cavity by using wall losses

Jiao Chong-Qing (焦重庆), Zhu Hong-Zhao (朱弘钊)   

  1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
  • Received:2012-12-16 Revised:2012-12-31 Online:2013-06-27 Published:2013-06-27
  • Contact: Jiao Chong-Qing E-mail:cqjiao@ncepu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51037001).

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摘要： The cavity-mode resonance effect could result in significant degradation of the shielding effectiveness (SE) of a shielding enclosure around its resonance frequencies. In this paper, the influence of coated wall loss on the suppression of the resonance effect is investigated. For this purpose, an equivalent circuit model is employed to analyze the SE of an apertured rectangular cavity coated with an inside layer of resistive material. The model is developed by extending Robinson's equivalent circuit model through incorporating the effect of the wall loss into both the propagation constant and the characteristic impedance of the waveguide. Calculation results show that the wall loss could lead to great improvement on the SE for frequencies near the resonance but almost no effect on the SE for frequencies far away from the resonance.

关键词: electromagnetic shielding, rectangular cavity, wall losses, resonance effect

Abstract: The cavity-mode resonance effect could result in significant degradation of the shielding effectiveness (SE) of a shielding enclosure around its resonance frequencies. In this paper, the influence of coated wall loss on the suppression of the resonance effect is investigated. For this purpose, an equivalent circuit model is employed to analyze the SE of an apertured rectangular cavity coated with an inside layer of resistive material. The model is developed by extending Robinson's equivalent circuit model through incorporating the effect of the wall loss into both the propagation constant and the characteristic impedance of the waveguide. Calculation results show that the wall loss could lead to great improvement on the SE for frequencies near the resonance but almost no effect on the SE for frequencies far away from the resonance.

Key words: electromagnetic shielding, rectangular cavity, wall losses, resonance effect

中图分类号:  (Applied classical electromagnetism)

  • 41.20.-q
41.20.Jb (Electromagnetic wave propagation; radiowave propagation) 84.32.-y (Passive circuit components)