Microwave Absorbers Prepared with Alnico Magnets

Song, Jae-Man; Kim, Dong-Il; Shin, Seung-Jae; Moon, Sang-Hyun; Choi, Jung-Hyun; Jeung, Jae-Hyun

Journal of Navigation and Port Research 2005;29(2):147-150.
Published online March 31, 2005.

Microwave Absorbers Prepared with Alnico Magnets

Jae-Man Song, Dong-Il Kim, Seung-Jae Shin, Sang-Hyun Moon, Jung-Hyun Choi, Jae-Hyun Jeung

Abstract

We suggest a cast Alnico magnet as a new microwave absorber. The proposed Alnico microwave absorber shows advanced microwave absorption properties of 24 ㏈ at 13.3 ㎓ for the thicknesses of 1 ㎜. We also investigated the effects of the carbon, which effects strongly to microwave absorption in Alnico magnet microwave absorbers. Central frequency shifts toward lower frequency with increasing Alnico content which is related to the frequency to show tanδ＞1. Also, we investigated the sample thickness dependence on the microwave absorption properties.

Key Words: Microwave absorber;Recycled Alnico magnet;Carbon content;Alnico content;Sample thickness;㎓ range;Soft ferrite;Hard ferrite