Systematic Analysis and Engineering of Absorbing Materials Containing Magnetic Inclusions for EMC Applications
A methodology to efficiently design novel products based on magneto-dielectric materials containing ferrite or magnetic alloy inclusions is presented. The engineered materials should provide desirable frequency responses to satisfy requirements of electromagnetic compatibility/immunity over RF and microwave bands. The methodology uses an analytical model of a composite magneto-dielectric material with both frequency-dependent permittivity and permeability. The Bruggeman asymmetric rule for effective permeability of a composite is modified to take into account demagnetization factors of inclusions, and is shown to be applicable to platelet magnetic inclusions. Complex permittivity and permeability are extracted from the transmission-line measurements. A novel accurate and efficient curve-fitting procedure has been developed for approximating frequency dependencies of both permittivity and permeability of magneto-dielectric materials by series of Debye-like frequency terms, which is important for wideband full-wave numerical time-domain simulations. Results of numerical simulations for a few structures containing magneto-dielectric sheet materials and their experimental validation are presented.
M. Koledintseva et al., "Systematic Analysis and Engineering of Absorbing Materials Containing Magnetic Inclusions for EMC Applications," IEEE Transactions on Magnetics, vol. 47, no. 2, pp. 317-323, Institute of Electrical and Electronics Engineers (IEEE), Feb 2011.
The definitive version is available at http://dx.doi.org/10.1109/TMAG.2010.2084991
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Absorbing Materials; Absorbing Media; Analytical Model; Causality; Complex Permittivity; Demagnetization Factors; Dielectric Sheets; Effective Permeability; Engineered Materials; Experimental Validations; Frequency Dependencies; Frequency-Dependent; Magnetic Alloy; Magnetic Inclusions; Microstrips; Microwave Bands; Numerical Simulation; Systematic Analysis; Time-Domain Simulations; Transmission Line Measurements; Wide-Band; Bandpass Filters; Composite Materials; Computer Simulation; Curve Fitting; Demagnetization; Electric Lines; Electromagnetic Compatibility; Electromagnetic Wave Absorption; Electromagnetism; Ferrite; Ferrites; Frequency Response; Gyrators; Magnetic Materials; Magnetos; Mathematical Models; Microstrip Lines; Permittivity; Time Domain Analysis; Transmission Line Theory; Dielectric Materials; Absorbing Media; Causality; Composite Material; Microstrip Line; Transmission Line Measurements
International Standard Serial Number (ISSN)
Article - Journal
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