Microwave absorption characteristics of chiral materials with Fe 3 O 4 -polyaniline composite matrix

Author： Sun G. C. Yao K. L. Liao H. X. Niu Z. C. Liu Z. L.

ISSN： 1362-3060

Source： International Journal of Electronics, Vol.87, Iss.6, 2000-06, pp. : 735-740

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Abstract

Fe₃O₄-polyaniline composites have been prepared in which the concentrations of Fe₃O₄ are 10%, 15%, 20%, 30% and 40% by weight. Microwave chiral composites are then prepared employing copper helices as chiral inclusions and the Fe₃O₄- polyaniline composites as the matrix. The electromagnetic parameters of the chiral Fe₃O₄-polyaniline composites are measured using a circular waveguide method at 9.5 GHz, and the normal reflectance from a perfect conductor-backed chiral slab is calculated. The microwave absorption characteristics of the chiral Fe₃O₄- polyaniline composites are studied and compared with those of a non-chiral Fe₃O₄-polyaniline composite matrix. The results show that the addition of the chiral inclusions to the non-chiral matrix improves both the dielectric and the magnetic losses. As well as this improvement in losses, the chiral materials have higher microwave absorption. The optimal concentration of Fe₃O₄ in the matrix is about 15% to obtain the lowest reflectance of chiral Fe₃O₄-polyaniline composites.