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Modeling Electromagnetic Emissions From Printed Circuit Boards in Closed Environments Using Equivalent Dipoles

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5 Author(s)
Xin Tong ; George Green Inst. for Electromagn. Res. (GGIEMR), Univ. of Nottingham, Nottingham, UK ; Thomas, D.W.P. ; Nothofer, A. ; Sewell, P.
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In this paper, a method for representing electromagnetic emissions from a printed circuit board (PCB) using an equivalent dipole model deduced from near-field scanning is proposed. The basic idea is to replace the PCB with a set of infinitesimal dipoles that generate the same radiated fields. Parameters of the equivalent dipoles are determined by directly fitting to the measured magnetic near fields. In closed-environment simulations, the equivalent method is extended to a dipole-dielectric conducting plane model to account for the interactions between the PCB and enclosure by including the basic physical features of the PCB. The electromagnetic emissions can then be predicted by solving the equivalent model with numerical methods, thereby, significantly reducing the simulation time and storage costs. A basic test board and a more complex practical telemetry PCB are modeled in different configurations and compared with measurements and full-field simulations, confirming the validity and efficiency of the model.

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:52 ,  Issue: 2 )

Date of Publication:

May 2010

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