Circular Cavitation Based Lightweight and Broadband Radar Absorbing Structure

Abstract

The search for low-cost practical radar absorbing structures (RAS) to decrease electromagnetic (EM) emissions has aroused interest. To strengthen electronic waste (e-waste) treatment and explore wideband absorber structure, perforated RASs are proposed and modelled with the magneto-dielectric properties of microwave heat treated e-waste composite. The investigation of proposed structures is carried out in 8.2 to 12.4 GHz (i.e., X-band). The thin and wideband single layer RAS is optimized with the help of multi-objective Jaya's optimization algorithm. As an outcome, a −16.8dB reflection coefficient (RC) is achieved in 2.4mm thick grid type RAS at 10.2 GHz exhibiting a −10dB bandwidth of 4.2 GHz. Furthermore, at a fixed optimized thickness, the proposed RAS is also examined against various oblique angles of incidence and found to be prominent. The full-wave simulation is utilized for the validation of optimized results and both are in good agreement with each other. The addition of a circular air gap in the structure regulates the composite EM characteristics at a higher frequency. It demonstrates that cavitation has magnificent advantages for the creation of wideband, lightweight, and low expense RAS for the stealth technology.