7-Wideband Polarization Insensitive Metamaterial Absorber with Perfect Dual Resonances

Osman Ayop, Mohamad Kamal A. Rahim, and Noor Asniza Murad, “Wideband polarization-insensitive metamaterial absorber with perfect dual resonances,” META’15, the 6^thInternational Conference on Metamaterials, Photonic Crystals, and Plasmonics, New York USA, 4-7 Aug. 2015.

Abstract-This paper presents the analysis of wideband polarization insensitive metamaterial absorber with perfect dual resonances. The structure is designed using lossy FR4 substrate with copper layers. The resonating elements are designed using the combination of circular ring with modified circular structure. The resonating elements are printed on the top surface of FR4 substrate, while at the bottom surface is printed with full copper ground plane. Parametric study is done to obtain the optimum design using CST software. From the simulation, the proposed design achieves nearly perfect absorbance at dual resonant frequency with improved bandwidth compared to the general circular ring design. Two peaks absorbance of 98.66% and 99.84% are observed at 9.81 GHz and 10.41 GHz respectively with absorbance bandwidth of 10.29% at normal incident wave. The structure is also simulated for different polarization angles and it is observed that the structure can maintain the absorbance characteristic for all polarization angle.