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Device Physics: Simulating Electronic Smog

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A closeup of a printed circuit board.

A new mathematical model can estimate the electromagnetic emissions of printed circuit boards, quickly and accurately.


Researchers from A*Star and Samsung Electronics have developed a mathematical model that rapidly and accurately estimates the electromagnetic emissions from printed circuitboards.

To ensure that such emissions are within acceptable limits, electronics such as mobile phones and laptops must undergo testing to measure electronic smog before they can be marketed. Those tests have traditionally been done in large rooms designed to capture electromagnetic waves emitted from the device, says study leader Wei-Jiang Zhao of A*STAR's Institute of High Performance Computing.

An alternative to this costly process involves scanning the electromagnetic field very close to the device's circuitboards, which requires powerful computers to perform many hours of calculations.

The mathematical model developed by Zhao's team translates near-field measurements into an accurate estimate of far-field radiation in less than 10 minutes on a standard desktop computer.

The researchers tested their model using simulated near-field data from a thin, L-shaped metal strip laid on a small circuitboard. The data contained 1,273 sample points, each 10 millimeters above the board. The model could measure this magnetic field using just a few virtual magnetic dipoles, achieving good agreement with the use of nine; adding a 10th dipole did not significantly improve matches.

From A*STAR Research
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Abstracts Copyright © 2013 Information Inc., Bethesda, Maryland, USA


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