Electromagnetic and radar absorbing properties of γ Fe2O3/Ba4Co2Fe36O60-epoxy polymeric composites for stealth applications

Abstract

ABSTRACT Various constituent ratios with 50:30, 40:40 and 30:50 wt. % of U-type barium hexaferrite (Ba4Co2Fe36O60) and Gamma iron oxide (γ Fe2O3) have been used to designing the radar absorbing composites within epoxy resin system. In the current work, studies are done on electromagnetic and absorbing properties of γ Fe2O3 powder dispersed Ba4Co2Fe36O60-epoxy composites. X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and Vibrating Sample Magnetometer (VSM) tools have been used for structural, surface morphology and magnetic properties respectively of the synthesized powder and fabricated composites. The electromagnetic properties (e , e , μ & μ ) of fabricated composites were retrieved from measured reflection (S11 & S22) and transmission (S12 & S21) parameters in 2-18 GHz frequency range. Experimental finding show that the fabricated composite having 50 wt. % of γ Fe2O3 of designed Ba4Co2Fe36O60/γ Fe2O3-epoxy composites possesses maximum absorption of 98.8 % (RLmin of -19.89 dB) at 13.2 GHz for sample thickness of 3.2 mm. The fabricated microwave absorbers confirm the effective absorption performance which has potential for strategic applications and stealth technology.