A New Methodology to Predict the Magnetic Shielding Effectiveness of Enclosures at Low Frequency in the Near Field

Frikha, Amin; Bensetti, Mohamed; Duval, Fabrice; Benjelloun, Nabil; Lafon, Frédéric; Pichon, Lionel

doi:10.1109/tmag.2014.2362953

Cited by 40 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Fig. 1b, the incident electric field can be decomposed into the following components: E = −sin φcos θcos α + cos φsin α E 0 e x + sin θcos α E 0 e y − cos φcos θcos α + sin φsin α E 0 e z (1) where E 0 is the magnitude of E, e x , e y and e z are the unit vectors in the associated directions. The aperture impedance can be expressed as…”

Section: Modelling Of the Shielding Enclosurementioning

confidence: 99%

See 1 more Smart Citation

Efficient analytical method for the shielding effectiveness of an apertured enclosure based on the BLT equation

Gong

Jiang

2020

IET sci. meas. technol.

View full text Add to dashboard Cite

An efficient analytical method based on the Baum–Liu–Tesche (BLT) equation has been developed for predicting the shielding effectiveness (SE) of an apertured enclosure excited by an external plane wave. First, the equivalent circuit and the signal flow graph are constructed, which helps understand the energy transmission of the enclosure. Then, the SE is obtained by using the generalised BLT equation, and the proposed analytical method is employed to analyse the effect of various parameters on the SE. Finally, the analytical method is extended to handle the enclosure with an aperture array, an enclosure with apertures at the opposing walls and two cascaded enclosures. The analytical method has been successfully verified by the CST over a wide frequency band of 0–3.0 GHz, which consumes less time than conventional numerical methods. Besides, whatever the condition of the enclosure or the aperture is, the analytical method can predict the SE and higher‐order modes at higher frequencies accurately.

show abstract

Section: Modelling Of the Shielding Enclosurementioning

confidence: 99%

“…As a result, the EM interference (EMI) problems are becoming increasingly prominent and severe. EM shielding [1][2][3][4][5] is a significant measure in EMI control and also a preferred design method in EM compatibility (EMC). A metallic enclosure has been frequently utilised to reduce the EMI.…”

Section: Introductionmentioning

confidence: 99%

Efficient analytical method for the shielding effectiveness of an apertured enclosure based on the BLT equation

Gong

Jiang

2020

IET sci. meas. technol.

View full text Add to dashboard Cite

show abstract

“…Low frequency magnetic shielding has wide applications in many fields, like electric vehicles [1], [2], wireless power transmission (WPT) system [3]- [5], ultrasensitive atomic sensors [6], and control circuit boards of IGBT devices [7]. Usually, a metallic shell is employed as shielding enclosure.…”

Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness Analysis of the Conducting Spherical Shell With a Circular Aperture Against Low Frequency Magnetic Fields

et al. 2020

View full text Add to dashboard Cite

In this paper, an analytical model is presented to calculate the low frequency magnetic shielding effective (SE) of the spherical shell with a circular aperture and finite conductivity. This model is obtained by the combination of two submodels: the finite conductivity shell without the aperture, and the perfect conductor shell with the aperture. Both the submodels have existing analytical solutions. The first submodel represents the diffusion effect of magnetic field penetration through the conducting shell, and the second one denotes the aperture effect of magnetic field leakage through the aperture. The total magnetic field is the superposition of these from the two submodels. Calculation results are provided for an aluminum spherical shell of radius 0.1m for frequencies between 10Hz and 1MHz. The results are in good agreement with these form 2D axisymmetric finite element simulations. It is shown that there is a critical frequency. Below this frequency, the diffusion effect is dominant and the SE enhances with the increase of frequency. Above this frequency, the aperture effect is dominant and the SE keeps unchanged with the variation of frequency. In addition, the phase shift characteristics are also analyzed for the two effects respectively, and are employed to elucidate the mechanism of the resonance phenomenon of the SE around the critical frequency. Further, the effect of aperture depth is investigated numerically, which shows that increasing the depth has similar effect on SE like reducing aperture radius.INDEX TERMS Shielding effectiveness, spherical shield, a circular aperture, the resonance phenomenon, magnetic shielding.

show abstract

“…In the literature, a lot of work has been already achieved on the modelling of electronic components [1][2][3]. These approaches are based on the near field measurement of the magnetic field as a diagnostic tool of electromagnetic radiation [4,5]. In [6][7][8], the inverse method based on the elementary dipoles was used to extract the equivalent model from printed circuit board circuits.…”

Section: Introductionmentioning

confidence: 99%

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

Zitouna

Slama

2018

IET Power Electronics

View full text Add to dashboard Cite

This study presents a time domain modelling method for sources of electromagnetic disturbance. For the identification of an equivalent model, the proposed method is based on the synchronised temporal measurements of the magnetic near field above a power electronic system. To determine the parameters of the model, the proposed methodology is combined with an optimisation method based on the genetic algorithms. Unlike the classical approaches developed in the frequency domain, the proposed method allows finding a valid equivalent model for all radiation frequencies of measured time signals. It also enables knowing the phase shift in time between the radiating sources. The proposed method is applied in order to find the equivalent radiating sources of an AC/DC flyback converter. The accuracy and precision of the proposed method are validated by the good agreement between the measured cartography of the magnetic near field and that calculated using the parameters of the developed model. Finally, the latter's parameters are used to predict the cartography of other components of the magnetic field, which will be compared with the measured cartography. The superposition of the results confirms that the identified equivalent sources can represent real sources in the studied structure.

show abstract

A New Methodology to Predict the Magnetic Shielding Effectiveness of Enclosures at Low Frequency in the Near Field

Abstract: International audienc

Cited by 40 publications

References 8 publications

Efficient analytical method for the shielding effectiveness of an apertured enclosure based on the BLT equation

Efficient analytical method for the shielding effectiveness of an apertured enclosure based on the BLT equation

Shielding Effectiveness Analysis of the Conducting Spherical Shell With a Circular Aperture Against Low Frequency Magnetic Fields

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

Contact Info

Product

Resources

About