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J Electromagn Eng Sci > Volume 16(3); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(3):150-158.
DOI: https://doi.org/10.5515/JKIEES.2016.16.3.150   
Effects of Sheet Thickness on the Electromagnetic Wave Absorbing Characterization of Li0.375Ni0.375Zn0.25-Ferrite Composite as a Radiation Absorbent Material
Dong-Young Kim1, Young-Ho Yoon1, Kwan-Jun Jo1, Gil-Bong Jung1, Chong-Chul An2
1Defense Agency for Technology and Quality
2MA Electronic Co.
Correspondence:  Dong-Young Kim,Email: intellab@naver.com
Abstract
This paper reports on a study of LiNiZn-ferrite composite as a radiation absorbent material (RAM). The electromagnetic (EM) wave absorbers are composed of an EM wave absorbing material and a polymeric binder. The surface morphology, chemical composition, weight percent of the ferrite composite of the toroid sample, magnetic properties, and return loss are investigated using field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and network analyzer. For preparing the absorbing sheet, chlorinated polyethylene (CPE) is used as a polymeric binder. The EM wave absorption properties of the prepared samples were studied at 4 - 8 GHz. We can confirm the effects of the thickness of the samples for absorption properties. An absorption bandwidth of more than a 10-dB return loss shifts toward a lower frequency range along with an increase in the thickness of the absorber.
Key words: Electromagnetic Wave Absorber, Ferrite Composite, LiNiZn-Ferrite, Return Loss
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