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J. Electromagn. Eng. Sci > Volume 12(1); 2012 > Article
Journal of the Korean Institute of Electromagnetic and Science 2012;12(1):20-25.
DOI: https://doi.org/10.5515/JKIEES.2012.12.1.20   
Design and Fabrication of the EM Wave Absorber with Excellent Characteristics for ETC System
Dong-Il Kim, Dong-Soo Choi, Dong-Han Choi, Do-Yeol Kim
Department of Radio Communication Engineering at Korea Maritime University
Abstract
In this paper, the EM wave absorber for ETC system was designed and fabricated. We fabricated several samples in different composition ratios of flaked sendust 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 flaked sendust and CPE was found as 60 : 40 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 2.75 mm and absorption ability was 22.5 dB in the case of normal incidence 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, Flaked Sendust, Permittivity, Permeability, Loss Tangent

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