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Measurement of Near-Field Electromagnetic Emissions and Characterization Based on Equivalent Dipole Model in Time-Domain

Zhao, Yuan; Baharuddin, Mohd Hafiz; Smartt, Christopher; Zhao, Xiang; Yan, Liping; Liu, Changjun; Thomas, David W. P.


Yuan Zhao

Mohd Hafiz Baharuddin

Xiang Zhao

Liping Yan

Changjun Liu

Professor of Electromagnetics Applications


In this article, a method for representing electromagnetic emissions from a device under test (DUT) using an equivalent time dependent dipole array model deduced from the time-domain near-field scanned tangential magnetic fields is proposed. First, a three-dimensional (3-D) time-domain near-field scanning system is established to measure the tangential magnetic fields emitted from DUTs which are a transmission line above a ground plane and a printed circuit board (PCB) with several microstrips, respectively. For time-domain measurements, two magnetic field probes are calibrated over a broad bandwidth for both amplitude and phase to obtain their complex probe factors. Then, the measured magnetic fields are utilized to construct an equivalent time dependent dipole array model to represent the electromagnetic sources of the DUT. Parameters of the time dependent equivalent dipoles are directly calculated by fitting to the measured magnetic fields. The effects of different number of dipoles on the accuracy of the reconstructed magnetic fields from the PCB are studied. The reconstructed equivalent dipoles of the DUTs can be used to predict the electromagnetic fields at other observation levels. The results predicted by the equivalent dipole model are in agreement with the simulated and measured results.

Journal Article Type Article
Publication Date 2020-08
Journal IEEE Transactions on Electromagnetic Compatibility
Print ISSN 0018-9375
Electronic ISSN 1558-187X
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 62
Issue 4
Pages 1237-1246
APA6 Citation Zhao, Y., Baharuddin, M. H., Smartt, C., Zhao, X., Yan, L., Liu, C., & Thomas, D. W. P. (2020). Measurement of Near-Field Electromagnetic Emissions and Characterization Based on Equivalent Dipole Model in Time-Domain. IEEE Transactions on Electromagnetic Compatibility, 62(4), 1237-1246.
Keywords Transmission line measurements , Time-domain analysis , Integrated circuit modeling , Magnetic circuits , Magnetic resonance imaging , Time measurement
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