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J. Electromagn. Eng. Sci > Volume 8(3); 2008 > Article
Journal of the Korean Institute of Electromagnetic and Science 2008;8(3):110-113.
DOI: https://doi.org/10.5515/JKIEES.2008.8.3.110   
A Study on Development of EM Wave Absorber Using TiO2 for Automotive Radar in Cars
Chang-Mook Choi1, Dong-Il Kim2
1Department of Navigation & Shiphandling, Korea Naval Academy
2Department of Radio Communication & Engineering, Korea Maritime University
Abstract
In this paper, we designed and fabricated an electromagnetic(EM) wave absorber for automotive radar in cars using $TiO_2$ as a dielectric material and chlorinated polyethylene(CPE) as a binder. First of all, we confirmed that the optimum composition ratio of $TiO_2$ was about 70 wt.%. The complex relative permittivity of a sample containing $TiO_2$: CPE=70:30 wt.% was calculated from S-parameter. The EM wave absorption abilities were simulated for the EM wave absorbers of different thickness using the calculated relative permittivity, and the EM wave absorber was manufactured based on the simulated design. A comparison of simulated and measured results is in good agreement. Measurement shows that a 1.85 mm thick absorber has absorption ability higher than 20 dB in the frequency range of $76{sim}77$ GHz for automotive radars.
Key words: Absorption Ability, CPE, EM Wave Absorber, Permittivity$TiO_2$

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