Efficient single and bi-layer absorbers of CaTiO3 micro-cubes and polypyrrole nanotubes composites for enhanced microwave absorption in X and Ku band

The present study is focused on the investigation of the absorption properties of the bi-layer absorber with different thickness and orientation approaches. Improvement in absorption exclusively depends on the various parameters as interfacial polarization, multiple reflections among layers, conduction loss, phase cancellations, and shape anisotropy, etc. By considering these parameters. Calcium titanate micro-cubes CaTiO3 (CTO) and polypyrrole nanotubes (PPy) nanocomposites were prepared and microwave absorption from single layer coaxial absorbers having M1 = CaTiO₃+15 wt% polymer and M2 = CaTiO₃+30 wt% polymer were determined. Different layer orientations and thicknesses of the bi-layer absorber were optimized by CST software. FESEM, XRD, VSM, and VNA were used to find out the microstructural, phase, morphology, magnetic, and absorptions properties in microwave region. The values of the RL from M1 and M2 are −24 dB and −32 dB for 2.5 mm thickness. However, the RL response absorber with 2 mm thickness shows −19 dB and −11 dB. The bi-layer absorber with M1 and M2 having 0.5/0.5 mm (lower/upper) arrangement layer depicted minimum loss in Ku band. It is expected that CTO/PPy absorbers are versatile absorbers for Ku and X band purposes.