DEVELOPMENT OF AL- DOPED STRONTIUM FERRITE/ LLDPE NANO COMPOSITE AND ITS MICROWAVE ABSORPTION PERFORMANCE IN X-BAND

In the present work, aluminium doped strontium ferrite nanoparticles (SrAlxFe12-xO19, x=1, 2, 3, 4) are used as inclusions in Linear Low Density Polyethylene (LLDPE) matrix to develop a composite. SrAlxFe12-xO19 is prepared for three different annealing temperatures, i.e., 800oC, 900oC and 1000oC. The X-ray diffraction study is conducted on SrAlxFe12-xO19.The complex permittivity and complex permeability is measured at X-band. Reflection loss of SrAlxFe12-xO19/LLDPE composite is determined using transmission line modelling (TLM) from the measured permittivity values. Thickness optimization carried out for the same sample from 1 mm to 4 mm, showed maximum reflection loss for 3 mm thickness and -10 dB bandwidth (i.e. 90% absorption) of ~3.02 GHz (8.70 to 11.72 GHz) for SrAlxFe12-xO19/LLDPE composite (x=3). ---------------------------------------------------------------------***-----------------------------------------------------------------