Abstract
Recently, magnetic composites consisting of magnetic particles dispersed in a polymermatrix have been widely discussed for miniaturizing high-frequency electronic componentssuch as antennae. Previously, we investigated the influence of the manufacturing process onthe homogeneous dispersion of magnetic particles in the polymer and on the magneticproperties of the magnetic composites. In order to miniaturize electronic components, it iscrucial to be able to independently control the permeability and permittivityin magnetic composites. This paper investigates the anisotropy and frequencydependence of the dielectric properties of magnetic composites fabricated from 20 vol%Zn5Ni75Fe20 flaked particles. The permittivity of magnetic composites fabricated fromZn5Ni75Fe20 flaked particles is anisotropic: at 1 GHz, the relative permittivities parallel andperpendicular to the plane of the specimens are 27.2 and 16.9, respectively. Thepermittivity varied little between frequencies of 50 MHz and 10 GHz.
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