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No.1(pp.1-33)

Home > Issues > Volume 2 (1997) > No.1(pp.1-33)

Design and Fabrication of Wide-band Ferrite Absorber Used in Anechoic Chamber

Journal of Magnetics, Volume 2, Number 1, 31 Mar 1997, Pages 25-27

Sung-Soo Kim(Department of Materials Engineering, Chungbuk National University), Ik-Kown Park(Department of Radio Engineering, Chungbuk National University)

Abstract

Ferrite tile absorber is of great concern for the application to anechoic chambers due to the growing demand of EMI or EMC measurements. This paper investigates the magnetic, dielectric and microwave absorbing properties of a Ni-Zn ferrite for the purpose. A design chart was constructed with the solutions of impedance-matching equation in the radio frequencies (30 MHz - 1 GHz). The material parameters for zero-reflection are predicted from the chart. The magnetic and dielectric properties of sintered Ni-Zn ferrite is found to be well suited for this requirements. A superior microwave absorbing properties (frequency band and absorber thickness) of the samples are demonstrated.

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