Numerical Green’s Function-Based Method for Modeling Radiated Emission From PCBs in Shielding Enclosures

Wang, Zi An; Jiang, Li Jun; Mao, Junfa; Li, Ping

doi:10.1109/tmtt.2021.3119333

Cited by 12 publications

(2 citation statements)

References 24 publications

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“…Although the inclusion of effects of surrounding environment truly guarantees the accuracy of the equivalent source, it brings another challenge, i.e., due to the complex environment, in the matrix construction process, the closed-form of the Green's function used to connect the equivalent dipole source to the near-field data is not available. To get this problem addressed, this work advises calculating the Green's function via full-wave numerical methods [23]. With this NGF, the source reconstruction process can be implemented even in complex EM environments.…”

Section: A Srm For the Electronic Circuits In Shielding Enclosurementioning

confidence: 99%

“…Thereby, the EM effects of the substrate, ground plane, and shielding enclosure are rigorously incorporated, which makes the reconstructed source more accurate. Due to the complex EM environment around the equivalent dipoles, the analytical form of the Green's function used to bridge the relation between the dipoles and the sampled magnetic near-field over a planar plane is not available, thus the numerical Green's function (NGF) is used to replace the analytical one [23]- [26]. As an inverse problem, the reconstructed source is very sensitive to noise disturbances and measurement uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Source Reconstruction of Electronic Circuits in Shielding Enclosures Based on Numerical Green’s Function and Application in Electromagnetic Interference Estimation

Wang

Xiao

Mao

et al. 2022

IEEE Trans. Microwave Theory Techn.

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In this work, to characterize the radiated emission from electronic circuits in shielding enclosure, an improved electric dipole-based source reconstruction method (SRM) is developed. Moreover, by resorting to this reconstructed equivalent source, the estimation of electromagnetic interference (EMI) between different circuit modules in the enclosure can be conveniently and accurately evaluated. Different from the freespace SRM, the equivalent dipoles of the proposed SRM are directly placed over the shielding box enclosed circuit board, and the numerical Green's function (NGF) is developed to bridge the connection between the equivalent dipoles and the planar scanned magnetic near-field. With the NGF strategy, the effects of surrounding environments (including the presence of substrate, ground plane, and shielding enclosure) are inclusively considered, which makes the proposed SRM valid for any complex EM environments in theory. Since the proposed SRM also has the capability of reproducing the radiated emission inside the shielding enclosure, it is critically helpful to evaluate the EMI between different circuit modules inside the shielding enclosure. To reach this aim, the Rayleigh-Carson Reciprocity theorem is referred, in which the original EM coupling problem is decomposed into the "forward problem" and "reverse problem." A Huygens box enclosing the victim circuit module is built and the EM fields on the box are obtained using the reconstructed dipoles in both problems. Then the EMI can be calculated accordingly. Therefore, the novelty and merits of the proposed approach are threefold: 1) the physically-based equivalent dipole model considers the interactions between the radiation sources and the surrounding objects, leading to the accurate prediction of radiated emissions both outside and inside the enclosure; 2) due to the utilization of the NGF, there is no approximation involved in the solution of the dipole's radiation, thus improving Manuscript

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Section: A Srm For the Electronic Circuits In Shielding Enclosurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Source Reconstruction of Electronic Circuits in Shielding Enclosures Based on Numerical Green’s Function and Application in Electromagnetic Interference Estimation

Wang

Xiao

Mao

et al. 2022

IEEE Trans. Microwave Theory Techn.

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An equivalent surface dipoles based source reconstruction for estimating radiated emissions numerically from shielded PCBs

Binda¹,

Singh²,

Singh³

et al. 2022

AEU - International Journal of Electronics and Communications

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Synthetic Aperture Interferometric Passive Radiometer Imaging to Locate Electromagnetic Leakage From Spacecraft Surface

Zhang,

Huang

et al. 2024

IET Circuits, Devices & Systems

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The localization of electromagnetic radiation leakage through cabin gaps is a critical and challenging aspect of electromagnetic compatibility (EMC) design for spacecraft with complex electromagnetic environments. This paper proposes a localization method based on synthetic aperture interferometric passive radiometry imaging. Electromagnetic radiation signals are measured at a certain distance from the spacecraft surface to form visibility samples. A Fourier transform pair between the visibility sample and the corrected brightness temperature for electromagnetic radiation leakage is established. The spacecraft surface electromagnetic leakage location image is obtained through the inverse Fourier transform. A sparse sampling method based on ant colony optimization was proposed to improve testing efficiency. The impacts of various factors, including positional parameters, positioning accuracy of the test antenna, scanning parameters, and measurement receiver amplitude/phase errors on the imaging results are analyzed. Experiments were conducted on a 1 m × 1 m × 1 m cabin with 51 holes on one surface, and the algorithm proposed in this paper was validated to effectively image and locate electromagnetic leakage points at different frequencies. The effectiveness of sparse sampling was also verified, with a localization accuracy of 90.2% and a testing time savings of 81.9%.

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Numerical Green’s Function-Based Method for Modeling Radiated Emission From PCBs in Shielding Enclosures

Cited by 12 publications

References 24 publications

Source Reconstruction of Electronic Circuits in Shielding Enclosures Based on Numerical Green’s Function and Application in Electromagnetic Interference Estimation

Source Reconstruction of Electronic Circuits in Shielding Enclosures Based on Numerical Green’s Function and Application in Electromagnetic Interference Estimation

An equivalent surface dipoles based source reconstruction for estimating radiated emissions numerically from shielded PCBs

Synthetic Aperture Interferometric Passive Radiometer Imaging to Locate Electromagnetic Leakage From Spacecraft Surface

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