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New magnetic composite materials for electromagnetic shields at microwave frequencies

J. NEAMTU1,* , W. KAPPEL1, E. PATROI1, T. MALAERU1, G. GEORGESCU1, L. GIURGIU2

Affiliation

  1. National Institute for Research and Development in Electrical Engineering INCDIE ICPE-CA. Splaiul Unirii 313, Bucharest
  2. Bucharest University, Faculty of Physics, Magurele-Bucharest, Romania

Abstract

In this paper we report the preparation and the microwave properties of magnetic composite materials for electromagnetic shields.These materials contain a ferromagnetic composite in proportion of 60-99%. By heat treatment in air or reducing atmosphere takes place the phase transformation of Fe2O3 into Fe3O4, γ Fe2O3 and Fe metalic. The magnetic shields were obtained by mixing with Ba M-type ferrite, and continued with the compacting with a powdered epoxy-acrylic resin composition, at a ratio of 1-3 mass %. Another set of samples was obtained by mixing with the rubber (at a ratio of 20-40 mass %)..

Keywords

Magnetic composite, Ferrite, Attenuation, Microwave frequency.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

J. NEAMTU, W. KAPPEL, E. PATROI, T. MALAERU, G. GEORGESCU, L. GIURGIU, New magnetic composite materials for electromagnetic shields at microwave frequencies, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 537-539 (2006)