A Study on Design and Fabrication of Complex Type EM Wave Absorber with Super Wide-band Characteristics

Kim, Dae-Hun; Kim, Dong-Il; Choi, Chang-Mook; Son, Jun-Young

Journal of Navigation and Port Research 2006;30(2):161-166.
Published online March 30, 2006.

A Study on Design and Fabrication of Complex Type EM Wave Absorber with Super Wide-band Characteristics

Dae-Hun Kim, Dong-Il Kim, Chang-Mook Choi, Jun-Young Son

Abstract

In order to construct an Anechoic Chamber satisfying international standards for ENII testing, it has been recogniz ed that the absorption characteristics of the EM wave absorber must be higher than 20dB over the frequency band from 30 MHz to 18 GHz. In this paper, an EM wave absorber with super wide-band frequency characteristics was proposed and designed in order to satisfy the above requirements by using the Equivalent Material Constant Method(EMCM) and Finite Difference Time Domain(FDTD). The proposed absorber is to attach a pyramidal absorber onto a hemisphere-type absorber on a cutting cone-shaped ferrite. As a result, the proposed absorber has absorption characteristics higher than 20dB over the frequency band from 30 MHz to mare than 20 GHz.

Key Words: Anechoic chamber;EM wave absorber;Absorption characteristics;Hemisphere type;Complex type