Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Study on Development of the EM Wave Absorber for ETC System

  • Park, Soo-Hoon (Department of Radio Communication Engineering, Korea Maritime University) ;
  • Kim, Dong-Il (Department of Radio Communication Engineering, Korea Maritime University) ;
  • Song, Young-Man (Ace Technology) ;
  • Yoon, Sang-Gil (Department of Radio Communication Engineering, Korea Maritime University)
  • Published : 2008.06.30
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Abstract

In this paper, the EM wave absorber was designed and fabricated for countermeasure against EMI from a ceiling of a tollgate in ETC system. We fabricated several samples in different composition ratios of MnZn-ferrite, Carbon, and CPE(Chlorinated Polyethylene). Absorption abilities were simulated in accordance with different thicknesses of the prepared absorbers and changed complex relative permittivity and permeability according to composition ratio. The optimized mixing ratio of MnZn-ferrite, Carbon, and CPE was found as 40:15:45 wt.% by experiments and simulation. Then the EM wave absorber was fabricated and tested using the simulated data. As a result, the developed EM wave absorber has the thickness of 3.3 mm and absorption ability was more than 20 dB in the case of normal incidence and more than 11 dB for the incident angle from 15 to 45 degrees at 5.8 GHz. Therefore, it was confirmed that the newly developed absorber can be used for ETC system.

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References

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