PolarizationInsensitive Metamaterial Absorber Using Sunflower Shaped Unit Cell

Abstract

In this paper, polarization insensitive metamaterial absorber using sunflower shaped unit cell is proposed. The performance of the proposed absorber was dcmonstared with 3D full-wave EM solver under normal incidence for TE and TM polarization modes. Due to the symmetric geometry of the sunflower shaped unit cell, the proposed absorber provides a high level of absorptivity, about %90, for both TE and TM modes at 11.9 Gliz. To enhance the absorptivity, we then created a hollow at the center of the proposed unit cell. The later design resonates at 11.7 Ghz, and provides perfect absorption for both polarization modes.