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

doi:10.1088/1674-1056/22/8/084101

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.

Keywords: electromagnetic shielding rectangular cavity wall losses resonance effect

Received: 16 December 2012
Revised: 31 December 2012
Accepted manuscript online:

PACS:	41.20.-q	(Applied classical electromagnetism)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	84.32.-y	(Passive circuit components)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51037001).

Corresponding Authors: Jiao Chong-Qing
E-mail: cqjiao@ncepu.edu.cn

Cite this article:

Jiao Chong-Qing (焦重庆), Zhu Hong-Zhao (朱弘钊) Resonance suppression and electromagnetic shielding effectiveness improvement of an apertured rectangular cavity by using wall losses 2013 Chin. Phys. B 22 084101

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

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