Localization of Electromagnetic Interference Sources Using a Time-Reversal Cavity

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 surfaces cavity can emulate infinite number sensors TR method. order EMI sources, equipment under test (EUT) is placed rectangular metallic cavity, suitable dimensions according considered frequency band EUT size, equipped with simple monopole or dipole antenna. demonstrate by only one sensor, are able taking advantage focusing properties The entropy criterion applied obtain time slice which maximum electric field determines location source. Both 2- 3-D numerical simulation schemes deployed ability proposed technique. validity simulations tested against frequency-domain measurements. Compared conventional tests anechoic chambers scanning methods, represents simpler cost-effective method requiring sensor (a antenna).