Development of the EM Wave Absorber for ETC of ITS

Song, Young-Man; Choi, Chang-Mook; Lee, Dae-Hee; Kim, Dong-il

Journal of Navigation and Port Research 2007;31(8):671-674.
Published online October 30, 2007.

ITS의 ETC용 전파흡수체 개발

송영만, 최창묵, 이대희, 김동일

Development of the EM Wave Absorber for ETC of ITS

Young-Man Song, Chang-Mook Choi, Dae-Hee Lee, Dong-il Kim

Abstract

In this paper, the EM wave absorber was designed and fabricated for ETC system, because ETC system has some problems including signal error and system-to-system interference. We fabricated some samples in different composition ratio of MnZn-ferrite, Carbon and CPE, confirmed that optimum composition ratio of Mn2n-ferrite, Carbon, CPE was 40 : 15 : 45 wt%. Complex relative permittivity and complex relative permeability was calculated by the measured data. And absorption abilities were simulated according to different thickness of the EM wave absorbers using complex relative permittivity and permeability. The EM wave absorber was fabricated based on simulated data Simulated and measured values agree well. As a result, the developed EM wave absorber has a thickness of 3.38 mm and absorption ability over 20 dB at 5.8 GHz.

Key Words: EM wave absorber;EM Wave Absorption;MnZn-Ferrite;Carbon;ETC