Enhanced Microwave Absorption of CNT Composites Mixing with Fe3O4 and Carbonyl Iron

CNT COMPOSITES MIXING WITH Fe 3 O 4 AND CARBONYL IRONWe fabricated two different kinds of composite materials for absorbing microwave in a frequency range of 2 to 18 GHz using coaxial airline and thru-reflect-line (TRL) method.The composite materials having carbon nanotube (CNT) with carbonyl iron (CI) or iron oxide (Fe 3 O 4 ) were fabricated by mixing each components.Magnetic properties were measured by SQUID equipment.Complex permittivity and complex permeability were also obtained by measuring S-parameters of the toroidal specimen dispersing CI/CNT and Fe 3 O 4 /CNT into the 50 weight percent (wt%) epoxy resin.The real permittivity was improved by mixing the CNT however, the real permeability was same as pure magnetic powders.The CI/CNT had a maximum value of real permittivity and real permeability, 11 and 1.4 at 10 GHz, respectively.The CNT composites can be adapted to the radar absorbing materials, band width 8-12 GHz.