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http://dx.doi.org/10.6109/jkiice.2014.18.7.1505

Development of the EM wave Absorber for Improving the Performance of Hi-Pass System in ITS  

Kim, Dong Il (Dept. of Radio Sciences and Engineering, Korea Maritime University)
Kim, Jeong Chang (Dept. of Elect. and Comm. Engineering, Korea Maritime University)
Joo, Yang Ick (Division of Electrical and Electronics Engineering, Korea Maritime University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.18, no.7, 2014 , pp. 1505-1510 More about this Journal
Abstract
High-Pass (ETC ; Electronic Toll Collection) system is one of the basic elements, which adopts a wireless communication method using 5.8 GHz and can realize a part of ITS (Intelligent Traffic System). On the other hand, communication errors occur frequently in Hi-Pass system due to signal erros, multi-path reflection, and/or system-to-system interferences. To solve these problems, an EM (Electro-Magnetic) wave absorber can be used. To solve these Problems, we fabricated some samples in the different composition ratios of Carbon, Sendust, and CPE, and it was confirmed that the optimum composition ratio of Carbon : Sendust : CPE is 10 : 40 : 50 wt.%. The complex relative permittivity and complex relative permeability were derived by using the measured data. In addition, the optimum design parameters for the absorber were determined by simulation. Then the absorption abilities were calculated by changing the thickness of the EM wave absorbers. As a result, the optimum thickness of the developed EM wave absorber was 2.85 mm with absorption ability over 22.4 dB at 5.8 GHz. Futhermore, the EM wave absorber was fabricated based on the simulated and designed values. The measured values agreed well with the simulated ones. Therefore, it was clearly shown that the developed EM wave absorber in this paper is to be applied in actual situations.
Keywords
EM wave absorber; Absorption ability; Carbon; Sendust; Hi-Pass (ETC) system; ITS;
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Times Cited By KSCI : 1  (Citation Analysis)
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