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Title: Determination of dimension-independent magnetic and dielectric properties for Mn-Zn ferrite cores and its EMI applications
Authors: Huang, R. 
Zhang, D.
Tseng, K.-J.
Keywords: Complex permeability
Complex permittivity
Dimensional effect
Mn-Zn ferrite
Newton-Raphson method
Issue Date: 2008
Citation: Huang, R., Zhang, D., Tseng, K.-J. (2008). Determination of dimension-independent magnetic and dielectric properties for Mn-Zn ferrite cores and its EMI applications. IEEE Transactions on Electromagnetic Compatibility 50 (3 PART 2) : 597-602. ScholarBank@NUS Repository.
Abstract: Simultaneously high permeability and permittivity results in a pronounced dimensional effect in Mn-Zn ferrite cores, which makes the measured complex permeability differ for cores with different dimensions. This paper provides a succinct method to solve an inverse problem of tracing dimension-independent or intrinsic complex permeability and permittivity for Mn-Zn ferrites using two toroidal and rectangular-cross-sectioned cores with different dimensions. The apparent complex permeability of ferrite cores with other dimensions can then be predicted from the traced intrinsic values, so will the effective impedance of common-mode chokes made of such cores. The traced intrinsic permeability is in good agreement with the measured apparent complex permeability of a very small toroidal ferrite core, in which dimensional effect can be ignored. The apparent complex permeabilities of ferrite cores with other dimensions are measured experimentally, and are also calculated from the determined intrinsic values. A very good agreement between the measured and calculated values is found. © 2008 IEEE.
Source Title: IEEE Transactions on Electromagnetic Compatibility
ISSN: 00189375
DOI: 10.1109/TEMC.2008.926914
Appears in Collections:Staff Publications

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