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Electromagnetic coupling and shielding effectiveness of apertured rectangular cavity under plane wave illumination

Jiao Chong-Qing Qi Lei

Electromagnetic coupling and shielding effectiveness of apertured rectangular cavity under plane wave illumination

Jiao Chong-Qing, Qi Lei
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  • Received Date:  22 August 2011
  • Accepted Date:  07 December 2011
  • Published Online:  05 July 2012

Electromagnetic coupling and shielding effectiveness of apertured rectangular cavity under plane wave illumination

  • 1. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China;
  • 2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 51037001), and the Fundamental Research Funds for the Central Universities in China (Grant No.10MG01).

Abstract: Based on the Bethe's theory for small aperture coupling and the eigen-mode expansion method, an approximate analytic model for the field distribution inside a rectangular cavity with apertures under plane wave illumination is presented. The effects of aperture shape, dimensions, number, position, and the wave incidence and polarization angles on cavity mode excitation can be taken into consideration in this model with clear physical explanation. The calculation results from this model are in better agreement with experimental data than those from the equivalent circuit model. The effects of various factors on the shielding effectiveness of the cavity are analyzed, and the obtained results are useful for guiding the design of electromagnetic shielding enclosures.

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