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No.2(pp.35-66)

Home > Issues > Volume 3 (1998) > No.2(pp.35-66)

Two-Layered Microwave Absorber of Ferrite and Carbon Fiber Composite Substrate

Journal of Magnetics, Volume 3, Number 2, 30 Jun 1998, Pages 64-67

Han-Shin Cho(Department of Materials Engineering, Chungbuk National University), Sung-Soo Kim(Department of Materials Engineering, Chungbuk National University)

Abstract

Microwave absorbing properties of ferrite-epoxy composite (absorbing layer) attached on the carbon fiber polymer composite (reflective substrate) are analyzed on the basis of wave propagation theory. A modified equation for wave-impedance-matching at the front surface of absorbing layer including the effect of electrical properties of the quasi-conducting substrate is proposed. Based on this analysis, the frequency and layer dimension that produce zero-reflection can be estimated from the intrinsic material properties of the obsorbing layer and the substrate. It is demonstrated that the microwave reflectivity of carbon fiber composite has a strong influence on the microwave absorbance of front magnetic layer.

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