Modeling Electromagnetic Field Coupling Through Apertures for Radio-Frequency Interference Applications

Electromagnetic field coupling between a digital platform and a radio-frequency antenna through an aperture represents one of the typical coupling paths responsible for radio-frequency interference (RFI) issues in mixed-signal systems. Conventional approaches of modeling radiation through an apertur...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2015-10, Vol.57 (5), p.1037-1048
Main Authors: Ren, Liehui, Fan, Jun
Format: Article
Language:English
Subjects:
Apertures
Cavity resonators
Current density
Electromagnetic field coupling through aperture
Electromagnetic interference
Ewald's transform
Exteriors
Green's functions
Green's functions in a cavity
Holes
Impedance
impedance network
Joining
Magnetic domains
metallic enclosure
method of moments (MoM)
mixed potential integral equations (MPIEs)
Networks
Ports (Computers)
radio-frequency interference (RFI)
segmentation method
Surface impedance
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Summary:Electromagnetic field coupling between a digital platform and a radio-frequency antenna through an aperture represents one of the typical coupling paths responsible for radio-frequency interference (RFI) issues in mixed-signal systems. Conventional approaches of modeling radiation through an aperture and evaluating the shielding effectiveness of a metallic enclosure with apertures for classic electromagnetic interference (EMI) applications are not sufficient to handle modern RFI challenges. This paper discusses a segmentation method, together with impedance network representation, employed to divide the enclosure EMI problem into exterior and interior problems. With a port definition based on the vector roof-top basis function, the impedance network for the exterior domain was rigorously formulated using a method of moments solution for mixed potential integral equations. The impedance network for the interior domain was computed using the cavity method based on the analytical formula of 3-D Green's functions in a rectangular cavity. Connecting a pair of impedance networks yielded the overall impedance relationship between the interior port and the exterior port. Ewald's transform was used to accelerate the computation of Green's functions in a cavity with metallic walls, which yielded fast convergence of the series summation in Green's functions. Good agreement with a commercial full-wave tool validated the proposed approach.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2015.2424248