Bandwidth Enhancement of Metamaterial Absorber using Double Resonance

Abstract

In this paper, a bandwidth-enhanced, polarization-insensitive metamaterial absorber using double resonance is presented. The unit cell consists of four patches. By properly designing the size of the four patches, the absorption peaks are brought closer together to provide enhanced bandwidth due to the multiresonance effect. The full-wave simulation results show that the structure has an enhanced bandwidth response with a 90% absorption bandwidth of 0.5 GHz (10.15-10.65 GHz) and two absorption peaks at 10.25 and 10.5 GHz. The unit cell is symmetric in design, giving rise to polarization insensitivity as well. The proposed absorber is fabricated and measured, showing that the experimental results agree with the simulated responses.