A gigahertz-range electromagnetic wave absorber with wide bandwidth made of hexagonal ferrite

被引：42

作者：

Matsumoto, M

Miyata, Y

机构：

[1] Nippon Telegraph and Tel. Corp., NTT Tech. Assit. and Support Center, Musashino-shi, Tokyo 180, 3-9-11, Midori-cho

来源：

JOURNAL OF APPLIED PHYSICS | 1996年 / 79卷 / 08期

关键词：

D O I：

10.1063/1.362284

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A thin electromagnetic wave absorber has been investigated; it is composed of hexagonal ferrite and retains high permeability even in the gigahertz-range. The grid-type wave absorber composed of the hexagonal ferrite was examined to broaden the bandwidth in a gigahertz-range by introducing free space in the direction perpendicular to the electric field, which decreased total permittivity. Absorbers made of Ba3Co2Fe24O41 (Co(2)Z) and Ba-2(Zn0.8Mn?0.2)(2)Fe12O22 [(Zn0.8Mn0.2)(2)Y] showed wide bandwidths of 1.8-5 GHz and 1.5-4.5 GHz (>15 dB), respectively, when the free space was 37% (v/v) and the thickness of the ferrite was about 5 mm. Increasing the free space led to a wider bandwidth: 1.7-9 GHz was achieved with a 50% (v/v) of free space when the thickness of the (Zn0.8Mn0.2)(2)Y was 7 mm. (C) 1996 American Institute of Physics.

引用

页码：5486 / 5488

页数：3