Alternative Method for Determining Permeability of a Ferrite Core by Using a Combined Microstrip Line-Coaxial Conductor

Takanobu AOYAMA  Masafumi KATSUDA  Tomohiko KANIE  Takashi TAKEO  

IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.11   pp.1769-1775
Publication Date: 2012/11/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1769
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
permeability measurement,  microstrip line,  measurement error,  equivalent network,  

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An equivalent network analysis for an arrangement that combines a microstrip line and coaxial conductor for the purpose of measuring permeability is discussed in this paper. The measurement circuit used consists of a coaxial conductor with a sample housed inside and a short microstrip line connected to both sides. The coaxial conductor is composed of an electrically grounded coaxial metal pipe with open ends and a center conductor. Equivalent networks for this arrangement are investigated to determine the complex permeability from the impedance of the measurement circuit. We have employed a π network composed of a resistor and an inductor connected in series, and shunt capacitors as the equivalent circuit for the measurement portion. It has been found that the measurement error ratio of less than a few percent can be obtained for most frequency ranges of 10 MHz to 500 MHz.