Characterization of M-type barium hexagonal ferrite-based wide band microwave absorber

This paper present the design, development and characterization of the hexagonal ferrite powder [BaCo0.58Ti0.5deltaMn0.1Fe(11.87-delta)O-19] and [Ba(MnTi)(delta)Fe(12-2delta)O19] at delta=1.6 as a microwave absorber. The hexagonal ferrite powder has been developed by dry attrition and sintering procedure. The developed ferrite powder 60% by weight has been mixed in epoxy resin to form a microwave-absorbing paint. This paint was coated on a conducting aluminum sheet to study the absorption characteristics of a linearly polarized TE wave at X band. The results for single- and two-layer microwave absorbers for different coating thicknesses have been reported. It has been found that it shows the broadband characteristics with minimum absorption of 8 dB from 8 to 12 GHz for a coating thickness of 2 mm. These paints are very useful in military applications Such as RCS reduction, camouflaging of the target and prevention of EMI, etc. (C) 2003 Elsevier B.V. All rights reserved.