Development of the EM Wave Absorber Using MnZn-Ferrite and Sendust for Wireless LAN at 2.4 GHz

Lee, Dae-Hee; Choi, Chang-Mook; Choi, Dong-Han; Kim, Dong-Il

Journal of Navigation and Port Research 2007;31(10):865-868.
Published online December 30, 2007.

MnZn-Ferrite와 Sendust를 이용한 2.4 GHz 무선LAN용 전파흡수체 개발

이대희, 최창묵, 최동환, 김동일

Development of the EM Wave Absorber Using MnZn-Ferrite and Sendust for Wireless LAN at 2.4 GHz

Dae-Hee Lee, Chang-Mook Choi, Dong-Han Choi, Dong-Il Kim

Abstract

Recently, wireless LANs are often applied in home or office because of its various of convenience. Frequency range of wireless LANs specified by IEEE 802.11b is at 2.4 GHz. The bluetooth, the microwave oven, and the PDA(Personal Digital Assistants) uses, however, the same frequency band. So problems will be produced in these environments, such as multi-pass interference and system-to-system interference. These problems can be eliminated by using EM wave absorber. In this paper, we designed and fabricated EM wave absorber using MnZn-Ferrite, Sendust, and CPE( Chlorinated Polyethylene). The EM wave absorber with the ratio of material (MnZn-Ferrite : Sendust : CPE = 64 : 16 : 20 wt.%) has thickness of 3.7 mm and absorption ability more than 17 dB at 2.4 GHz.

Key Words: Absorption ability;EM wave absorber;IEEE 802.11b