Dual Band thin Metamaterial Perfect Absorber Based on Triangle Shape

Abstract

Abstract This work presents a multi-band electromagnetic metamaterial perfect absorber. It is shown typical an artificial microwave metamaterial absorber that can realize dual-band excellent absorption. The unit cell of the proposed structure is designed by using an analogy triangular resonator, an electric dielectric substrate, and a continuous copper plate. Two excellent absorption peaks with absorption rates are 98.05%, and 96.43%. The ratios of the structure thickness to the wavelengths of the proposed design are 1/39, and 1/23 at resonance frequency 3.84 GHz and 6.62 GHz respectively, which are very smaller comparing with wavelengths. By using the surface current distributions, the mechanism of the dual-band is explained. This absorber is non sensitive to the TE polarization wave and highly sensitive to the TM polarization wave. Furthermore, this design concept can be extended to many applications such as energy electromagnetic harvesting, reduce radar cross section RCS, sensors, antenna, thermal image, and detection.