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Article
Time Synchronized Near-Field and Far-Field for EMI Source Identification
Proceedings of the IEEE International Symposium on Electromagnetic Compatibility, 2008. EMC 2008
  • Gang Feng
  • Wei Wu
  • David Pommerenke, Missouri University of Science and Technology
  • Jun Fan, Missouri University of Science and Technology
  • Daryl G. Beetner, Missouri University of Science and Technology
Abstract
The evaluation of a product in terms of radiated emissions involves identifying the noise sources. Spectrum analyzer (SA) measurements alone are unable to identify noise sources when multiple sources are responsible for emissions at a particular frequency. In this paper, an approach using combined near-field and far-field measurements is proposed. This method consists of recording signals from a near field probe and from an antenna in the far-field using a high speed oscilloscope and analyzing the relationship between them via different post processing methods. The noise source can be identified by varying the location of near-field probe and searching for the probe signal that best correlates to the far field signal. A variety of post processing methods have been employed in this work. The Short Term Fast Fourier Transform (STFFT) is used to visualize the time dependence of the frequency content. Envelope correlation, coherence factor, and cross-correlation methods are further explained and tested for their ability to identify possible sources of emission problems.
Meeting Name
IEEE International Symposium on Electromagnetic Compatibility, 2008. EMC 2008
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
  • EMI,
  • STFFT,
  • Coherence,
  • Cross-Correlation,
  • Far Field and Near Field,
  • Source Identification
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2008 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
8-1-2008
Citation Information
Gang Feng, Wei Wu, David Pommerenke, Jun Fan, et al.. "Time Synchronized Near-Field and Far-Field for EMI Source Identification" Proceedings of the IEEE International Symposium on Electromagnetic Compatibility, 2008. EMC 2008 (2008)
Available at: http://works.bepress.com/david-pommerenke/2/