Electromagnetic Shielding

This paper presents a detailed study of the shielding effectivity properties of metal enclosures. Measurements in anechoic chambers are compared to full-wave electromagnetic simulations. The study is not limited to the frequency range below the first resonance frequency. Different aspects are investigated such as the influence of the size, position and number of apertures, and the effect of the presence of metal plates and of absorbing materials. Where possible, the specific behavior of the shielding effectivity is explained theoretically and existing simple design rules are assessed.

Numerical and experimental study of the shielding effectiveness of a metallic enclosure

The penetration of high-intensity radiated fields (HIRF) into conducting enclosures via apertures is an EMI issue that is relevant to all aviation. The stories are numerous, of disrupted communications, disabled navigation equipment, etc., due to the effects of EM sources external to the aircraft. Here, the FDTD method is used to predict the shielding effectiveness of conducting enclosures with apertures, and the numerical results are compared with measurements. Several issues related to the FDTD analysis of highly resonant and high-quality factor (high-Q) structures, such as windowing and acceleration techniques, are examined and discussed.

HIRF penetration through apertures: FDTD versus measurements

The evaluation of the shielding effectiveness (SE) of rectangular metallic enclosures having apertures in their walls and loaded with conducting bodies is the subject of this paper. The conducting objects can be either modifications of the inner part of the enclosure (e.g., simple metal plates or protrusions of the walls) or elements to be protected from external fields (e.g., printed circuit boards or metallic boxes). The SE of such enclosures is thus investigated through an efficient integral formulation based on the method of moments. The proposed approach makes use of a very fast computation of the enclosure Green's functions, based on the Ewald representation and interpolation techniques. The analysis shows that the classical SE of enclosures (calculated when a uniform plane wave impinges on the aperture of an empty enclosure) can be a very tricky figure of merit since the field inside the shield can be seriously affected by the possible presence of 2-D or 3-D conducting loads, especially in the frequency range above the first resonant frequency of the aperture-enclosure system. Comparisons with full-wave results obtained through different commercial software confirm the validity of the proposed technique and its excellent performance.

Fast MoM Analysis of the Shielding Effectiveness of Rectangular Enclosures With Apertures, Metal Plates, and Conducting Objects

The multilevel fast multipole moment method is employed to compute the electromagnetic coupling and shielding of various aperture-coupled metallic enclosures. A phenomenological study of electromagnetic coupling, due to various slot shapes and sizes, with or without the presence of wire penetration is conducted. These slots are situated on over-moded cavities and two methods are proposed to mitigate slot coupling into the cavity's interior. As part of this work, we also investigate the coupling through similar slots and apertures within a complex platform such as an automobile. The proposed methods have shown to increase shielding by as much as 5-35 dB within the frequency range of interest.

http://www1.ece.uic.edu/MURI-RF/Publications_Canta/siah_couplingstudies.pdf

Coupling studies and shielding techniques for electromagnetic penetration through apertures on complex cavities and vehicular platforms

In this paper, the shielding effectiveness (SE) of enclosures is characterized experimentally as well as theoretically. First, an accurate measurement set-up is developed, enabling SE measurements in an anechoic chamber, at 3 meters from the DUT (Device Under Test). Secondly, full-wave simulations are performed, thus allowing an accurate comparison between measured and simulated results. A very good correspondence is obtained between experimental and theoretical results, with a discrepancy of less than 5 dB (for frequencies below the first resonance frequency of the enclosure). Also the resonance effects inside the box are efficiently predicted by the simulation tool.

Theoretical and experimental determination of the shielding effectiveness of test enclosures

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Numerical and experimental study of the shielding effectiveness of a metallic enclosure

Theoretical and experimental determination of the shielding effectiveness of test enclosures