Critical analysis of periodic fractal frequency selective surfacescoupled with synthesised ferrite‐based dielectric substrates for optimal radarwave absorption

It is a very challenging task to develop a good radar wave absorber with widebandwidth that corresponds to reflection loss (RL) ≤ − 10 dB and lower coatingthickness using radar absorbing material alone. However, this goal can beachieved with the application of advanced electromagnetic (EM) structures suchas fractal frequency selective surfaces (FFSSs). The prior knowledge of thesuitability of an FFSS for a particular nanocomposite material based on itsdielectric constant (ɛ′) is a very crucial factor. Therefore, acritical analysis has been carried out to choose the suitable FFSS geometriesfor a given set of nanocomposite materials having a ɛ′ rangingin between 1 and 20. The higher iterated Minkowski loop FFSS‐impactednanocomposite has been chosen for the experimental validation based on its goodradar wave absorption capability. The Minkowski loop FFSS‐impacted radarabsorbing coating (RAC) has been fabricated, and its performance evaluation hasbeen carried out. The measured RL of −17.9 dB at 10.8 GHz with a wide bandwidthof 2.9 GHz (RL≤−10 dB) has been noticed for 2.2 mm thick RAC. The findingsprovide an effective way to develop thin and broadband absorber for variouspractical EM applications.