@ARTICLE{Jeong_Kwang-Pil_Improvement_2020, author={Jeong, Kwang-Pil and Kim, Jeong-Gon and Yang, Su-Won and Choi, Jin-Hyuk and Park, Seung-Young}, volume={vol. 65}, number={No 4}, journal={Archives of Metallurgy and Materials}, pages={1287-1291}, howpublished={online}, year={2020}, publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences}, publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences}, abstract={The U-type ferrite is a kind of hexagonal ferrite, and it is known as a microwave absorber in the X-band. The magnetic and dielectric loss of the U-type ferrite change to the composition and coating layer, etc. In this study, the silicon oxide layer was coated on the substituted U-type ferrites to improve microwave absorption characteristics. The complex permittivity and complex permeability were measured using toroidal specimens that were press-molded and the measured frequency range was set from 2-18 GHz. The improvement of the microwave absorption rate was different according to the type of the substituted U-type ferrites. Only in the substituted U-type ferrites with nickel and zinc, an improvement in the microwave absorption rate due to enhancement of magnetic loss was confirmed. The highest microwave absorption was 99.9% at 9.6 GHz, which was S_Z0.5U.}, type={Article}, title={Improvement of Microwave Absorption Characteristics by Coating Layer in Substituted U-Type Ferrites}, URL={http://www.czasopisma.pan.pl/Content/116811/PDF/AMM-2020-4-10-Jeong%20Gon%20Kim.pdf}, doi={10.24425/amm.2020.133686}, keywords={hexagonal ferrite, U-type ferrite, silicon oxide layer, microwave absorption}, }