Parametric analysis of frequency selective surfaces over radar absorbing nanocrystalline structures

A thin radar wave absorber with wide bandwidth corresponding to reflection loss (RL) ≤ -10.0 dB is still very challenging job for researchers till date. In this paper, design of Frequency Selective Surface (FSS) loaded over single layer absorber is carried out with the help of Ansoft HFSS simulation tool. Copper and cobalt doped barium hexaferrite nanoparticles are synthesized through sol-gel auto combustion route and correspondingly its phase and morphology analysis is carried out using X-ray diffraction (XRD) and Field emission scanning electron microscope (FESEM), respectively. The waveguide measurements are performed to measure the complex permittivity and permeability values in the frequency regime of 8.2 to 12.4 GHz. Further, critical analysis of different type of FSS structures has been carried out to study the absorption effect. It has been found that strongest RL value for Minkowski loop with level 2 approaches up to -41.0 dB at 10.3 GHz with wide bandwidth of 3.0 GHz, which shows the effectiveness of absorber for various applications.