Performance Analysis of a Compact Wideband Metamaterial Absorber for Radar and Satellite Communications at Ku and K Bands

Metamaterial absorbers (MAs) are widely recognized for their near-unity absorption and ultrathin structure but typically be in distress from narrow bandwidth as a result of their resonance-based design. The goal of this research work is aimed at increasing the bandwidth of MAs while keeping them relatively small and easy to fabricate. We present a new MA design consisting of three consecutive layers: a copper ground plane, an FR4 dielectric substrate, & a double circle arrangement serving as the frequency selective surface (FSS). The suggested MA achieves a wideband absorption with a -10 dB BW of 13.63 GHz, extending from 13.86 GHz to 27.49 GHz, and a full width at half maximum (FWHM) BW of 15.42 GHz, according to simulation results using CST Studio. The simulation results reveal three distinct absorption peaks centered at 14.79 GHz, 19.73 GHz, and 24.65 GHz, with corresponding absorptivity values of 99.72%, 99.93%, and 99.92%. These exceptional absorption levels underscore the proposed design's efficacy in achieving near-perfect absorption at multiple frequencies, while also demonstrating a significant enhancement in broadband absorption performance. For applications needing wideband MAs with low structural complexity and good absorption efficiency, our study provides a potential answer.