Electromagnetic interference shielding efficiency and noise suppression in a transmission line for carbon-coated magnetic composite films

J. W. Lee, C. Y. Lee, Y. K. Hong, S. H. Kim, Jinsoo Joo, S. W. Kim, Y. B. Kim, K. Y. Kim, Y. C. Yun, K. S. Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report on the electromagnetic interference (EMI) shielding in the far-field and the near-field regions and on the noise suppression characteristics for carbon-coated Fe-Si-Al/polymer composite films in the frequency range from 20 MHz to 5 GHz. The carbon-coated Fe-Si-Al/polymer composite films were placed in a single microstrip line (MSL) and the reflection and transmission coefficients were measured to determine the noise suppression characteristics (i.e., power loss). The near-field EMI shielding efficiencies (SEs) were measured using the double MSLs method. The frequency dependence of the near-field EMI SE was similar to that of the dielectric constant and the permeability of the composite films. The far-field EMI SEs were measured for the composite films with various surface resistances. The EMI SE in the far-field region and the noise suppression of the composite films increased with decreasing surface resistance of the composite films. The measured EMI SEs and their frequency dependences in the far-field and the near-field regions qualitatively agree with the theoretical results obtained from the computer simulations.

Original languageEnglish
Pages (from-to)1434-1437
Number of pages4
JournalJournal of the Korean Physical Society
Volume53
Issue number3
Publication statusPublished - 2008 Sep 1

Fingerprint

electromagnetic interference
transmission lines
shielding
retarding
composite materials
far fields
carbon
near fields
power loss
polymers
permeability
computerized simulation
frequency ranges
permittivity
reflectance
coefficients

Keywords

  • Electromagnetic interference shielding efficiency
  • Magnetic composite film
  • Microstrip line
  • Noise suppression
  • Power loss

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Electromagnetic interference shielding efficiency and noise suppression in a transmission line for carbon-coated magnetic composite films. / Lee, J. W.; Lee, C. Y.; Hong, Y. K.; Kim, S. H.; Joo, Jinsoo; Kim, S. W.; Kim, Y. B.; Kim, K. Y.; Yun, Y. C.; Lee, K. S.

In: Journal of the Korean Physical Society, Vol. 53, No. 3, 01.09.2008, p. 1434-1437.

Research output: Contribution to journalArticle

Lee, JW, Lee, CY, Hong, YK, Kim, SH, Joo, J, Kim, SW, Kim, YB, Kim, KY, Yun, YC & Lee, KS 2008, 'Electromagnetic interference shielding efficiency and noise suppression in a transmission line for carbon-coated magnetic composite films', Journal of the Korean Physical Society, vol. 53, no. 3, pp. 1434-1437.
Lee, J. W. ; Lee, C. Y. ; Hong, Y. K. ; Kim, S. H. ; Joo, Jinsoo ; Kim, S. W. ; Kim, Y. B. ; Kim, K. Y. ; Yun, Y. C. ; Lee, K. S. / Electromagnetic interference shielding efficiency and noise suppression in a transmission line for carbon-coated magnetic composite films. In: Journal of the Korean Physical Society. 2008 ; Vol. 53, No. 3. pp. 1434-1437.
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AB - We report on the electromagnetic interference (EMI) shielding in the far-field and the near-field regions and on the noise suppression characteristics for carbon-coated Fe-Si-Al/polymer composite films in the frequency range from 20 MHz to 5 GHz. The carbon-coated Fe-Si-Al/polymer composite films were placed in a single microstrip line (MSL) and the reflection and transmission coefficients were measured to determine the noise suppression characteristics (i.e., power loss). The near-field EMI shielding efficiencies (SEs) were measured using the double MSLs method. The frequency dependence of the near-field EMI SE was similar to that of the dielectric constant and the permeability of the composite films. The far-field EMI SEs were measured for the composite films with various surface resistances. The EMI SE in the far-field region and the noise suppression of the composite films increased with decreasing surface resistance of the composite films. The measured EMI SEs and their frequency dependences in the far-field and the near-field regions qualitatively agree with the theoretical results obtained from the computer simulations.

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