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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1181

Title: Microwave permittivity and permeability of ferrite–polymer thick films
Authors: Verma, A
Saxena, A K
Dube, D C
Keywords: Microwave
Nickel–zinc ferrite composites
Thick films
Complex permittivity
Issue Date: 2003
Citation: Journal of Magnetism and Magnetic Materials, 263, 228–234
Abstract: Nickel–zinc ferrite–epoxy composites withdifferent ferrite/epoxy ratios, 50/50, 60/40, 70/30 and 80/20, have been prepared as thick films of thickness 100 mm. Different compositions of nickel–zinc ferrite, Ni10xZnxFe2O4, where x ¼ 0:2; 0:4 and 0.5 have been used to prepare the composite films. The complex permittivity (e0 - je00) and the complex permeability (m0 - jm00) of the films as well as of the sintered ferrites have been measured at X-band (8-12 GHz) microwave frequencies using the cavity perturbation technique. The dielectric constant and the permeability of the films are found to be different from those of the sintered ferrites. e0 of films is found to increase withincrease in the ferrite content of the composites as well as with frequency while the permeability, m0; is observed to decrease withincrease in ferrite content as well as frequency. The high permeability losses exhibited by the films at X-band frequencies, shows their potentiality for applications like suppression of electromagnetic interference in microwave circuits. The composites withth e ferrite composition x ¼ 0:5 are observed to exhibit higher losses compared to the composites with other compositions. Also the ferrite/epoxy ratio 80/20 is observed to give comparatively higher losses.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1181
Appears in Collections:Physics

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