A Study on Broadband Design of EM Wave Absorber for Anechoic Chamber

Kim, Dong-Il; Son, June-Young; Weon, Young-Su; Ku, Dong-Woo; Kim, Ki-Man; Song, Jae-Man; Yea, Byeong-Deok

Journal of the Korean Institute of Electromagnetic and Science 2002;2(1):16-21.

Dong-Il Kim¹, June-Young Son¹, Young-Su Weon², Dong-Woo Ku¹, Ki-Man Kim¹, Jae-Man Song³, Byeong-Deok Yea⁴

¹Dept. of Radio Sciences & Engineering, Korea Maritime Univ.
²Dept. of Electronics & Comm. Engineering, Korea Maritime Univ.
³Research Institute of Industrial Etchnology, Korea Maritime Univ.
⁴Division of Maritime Transportation Science of Korea Maritime Univ.

Abstract

On the contrary to the progress of the electronic industry and radio communication technologies, many social problems such as EMI, due to unnecessary electromagnetic(EM) wave are serious with the increased use of EM wave. It is required that the absorbing capability of an EM wave absorber is more than 20 dB, the bandwidth of which is required from 30 MHz to 18 GHz to satisfy the international standard about an anechoic chamber for EMI/EMS measurement$^{[1]}$TEX>. However, the absorbing frequency band of the conventional EM wave absorbers satisfying more than 20 dB is very narrow, for examples, from 30 MHz to 400 MHz in ferrite tile type and from 30 MHz to 870 MHz in ferrite grid type, respectively. In this paper, we proposed and designed a new tripe absorber with broadband characteristics covering the frequency band from 30 MHz to 10 GHz by use of the equivalent material constants method (EMCM)$^{[2]~[4]}$TEX>.

Key words: EMI/EMS, EMC, anechoic chamber, equivalent material constants method.