Experimentally verified Mn-Zn ferrites' intrinsic complex permittivity and permeability tracing technique using two ferrite capacitors

被引:14
作者
Huang, Ruifeng [1 ]
Zhang, Daming [1 ]
机构
[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Div Power Engn, Singapore 639798, Singapore
关键词
apparent complex permittivity; complex permeability; dimensional effects; Mn-Zn ferrite; Newton-Raphson method;
D O I
10.1109/TMAG.2006.888739
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
After setting up a mathematical model for rectangular-shaped Mn-Zn ferrite capacitors, this paper investigates dimensional effects on the intrinsic complex permittivity and the measured apparent complex permittivity of Mn-Zn ferrite blocks.The simple block structure of the samples guarantees their easy and precise preparation. Above a few hundred kilohertz, dimensional effects make the measured apparent complex permittivity deviate from its intrinsic value. This paper uses a Newton-Raphson based method to trace the intrinsic complex permittivity and permeability from the measured impedances of two rectangular-shaped Mn-Zn ferrite capacitors in the frequency range from a few hundred kilohertz to 40 MHz. From the traced intrinsic complex permittivity and permeability, the apparent complex permittivity of a third sample with different dimensions is then calculated theoretically. The papers also presents results of experiments carried out to measure the apparent complex permittivity of the third sample; agreement between the measured and the calculated values is very good. This justifies the validity of the method presented in this paper, when used to determine the dimension-independent intrinsic complex permittivity and permeability of Mn-Zn ferrites.
引用
收藏
页码:974 / 981
页数:8
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