Multimode Consideration in the Analysis of Shielding Effectiveness of a Metallic Enclosure with Off-Centred Apertures

Abstract

In this paper, an approach to the shielding effectiveness evaluation of a metallic enclosure with off-centred apertures is discussed. It has been previously shown that a simple analytical transmission line formulation gives good predictions of the shielding effectiveness of a metallic enclosure with off-centred apertures. In this work the model is extended to include higher order modes in the transmission line (TL) models. The loading effect of electronic components within the enclosure is modelled by the introduction of losses. The model remains very simple and computationally efficient.

Shielding Effectiveness Analysis and Modification of the Coupling Effect Transmission Line Method on Cavities with Multi-Sided Apertures

“…At present, there are a lot of papers on the study of aperture coupling problems, mainly analytical methods, numerical methods, and semi-empirical semi-analytical methods [2][3][4][5][6][7][8][9][10][11][12][13]. Moreover, the equivalent transmission line in the analytical method is widely used because of its simplicity and convenience.…”

“…If the wall material is a good conductor, its impedance is zero. When the aperture is not in the center of the cavity wall, the influence of different aperture positions on the coupling effect can be calculated by introducing the parameters [10] as follows:…”

Research on Electromagnetic Interference Resistance of Piezoelectric VibrationAcceleration Sensor

“…But the higher order modes of electromagnetic field in the cavity, the polarization angle and the incidence angle were ignored in the model. Farhana Ahmad Po'ad extended M. P. Robinson's model, and made the center of aperture free in x-axis in 2006 [8]. Followed Farhana Ahmad Po'ad, Shi Dan extended the model further, made the center of aperture free in x-axis and y-axis, and considered higher order modes of electromagnetic field in the cavity in 2009 [9,10].…”