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Title
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Localization of Electromagnetic Interference Sources Using a Time-Reversal Cavity
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Type
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JournalPaper
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Keywords
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Sensors , Electromagnetic interference , Focusing , Position measurement , Entropy , Image sensors , Electric fields
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Abstract
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In this article, we propose and implement a novel technique to locate electromagnetic interference (EMI) sources using the concept of time-reversal (TR) cavity. We show in an intuitive manner that reflections from the surfaces of a cavity can emulate an infinite number of sensors in the TR method. In order to locate EMI sources, the equipment under test (EUT) is placed in a rectangular metallic cavity, of suitable dimensions according to the considered frequency band and the EUT size, equipped with a simple monopole or dipole antenna. We demonstrate that by using only one sensor, we are able to locate EMI sources by taking advantage of the focusing properties of a TR cavity. The entropy criterion is applied to obtain the focusing time slice in which the maximum electric field determines the location of the EMI source. Both 2- and 3-D numerical simulation schemes are deployed to demonstrate the ability of the proposed technique. The validity of numerical simulations is tested against frequency-domain measurements. Compared with the conventional EMI tests in anechoic chambers and scanning methods, the proposed technique represents a simpler and cost-effective test method requiring only one sensor (a monopole or dipole antenna).
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Researchers
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Farhad Rachidi (Not In First Six Researchers), Marcos RubinStein (Fifth Researcher), Pierre Favrat (Fourth Researcher), Amirhossein Mostajabi (Third Researcher), mohammad azadifar (Second Researcher), hamidreza Karami (First Researcher)
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