Measurements of complex permittivity and permeability of common ferrimagnets at millimeter waves

被引：13

作者：

Afsar, MN ^{[1
]}

Lee, KM ^{[1
]}

Wang, Y ^{[1
]}

Kocharyan, K ^{[1
]}

机构：

[1] Tufts Univ, Dept Elect Engn, Medford, MA 02155 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2004年 / 40卷 / 04期

关键词：

hexagonal ferrites; magnetic permeability; millimeter waves; soft ferrites;

D O I：

10.1109/TMAG.2004.829016

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, complex permittivity and permeability of several yttrium iron garnet (Y]G) and hexagonal ferrite ceramics are investigated in a broad-band spectrum for the first time. The measurements were realized using a broad-band quasi-optical millimeter-wave (QOM) system with a backward-wave oscillator as the source of tunable coherent radiation. The dielectric and magnetic parameters of the ferrimagnets were obtained by fitting theoretical curves to the experimental spectra. Three types of YIG specimen were initially measured and compared to theoretical results, and then hexagonal ferrites were measured in the demagnetized state for the first time. It was shown that this method provides an accurate characterization of soft ferrites as well as hard anisotropic ferrites in the entire millimeter-wave range.

引用

页码：2826 / 2828

页数：3

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