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Improvement of Microwave Absorption Characteristics by Coating Layer in Substituted U-Type Ferrites

Jeong Kwang-Pil, Kim Jeong-Gon, Yang Su-Won, Choi Jin-Hyuk, Park Seung-Young

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1287--1291

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_Z0.5 U.