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J Electromagn Eng Sci > Volume 8(2); 2008 > Article
Journal of the Korean Institute of Electromagnetic and Science 2008;8(2):70-75.
DOI: https://doi.org/10.5515/JKIEES.2008.8.2.070   
A Study on Development of the EM Wave Absorber for ETC System
Soo-Hoon Park1, Dong-Il Kim1, Young-Man Song2, Sang-Gil Yoon1
1Department of Radio Communication Engineering, Korea Maritime University
2Ace Technology
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.
Key words: ETC, EM Wave Absorber, MnZn-ferrite, Carbon, Permittivity, Permeability

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