Miniaturized metamaterial absorber with high transparency using narrow metallic strip

In this article, a miniaturized transparent metamaterial absorber (MA) that can achieve boardband microwave absorption is presented. An extremely narrow eight-notch ring metallic strip and a new hexagonal metallic strip are employed to design the MA. The MA exhibits over 10 dB absorption from 8 to 20 GHz. The size of the unit is only 2.5×2.5mm2, about 0.116λ×0.116λ at the center frequency. The MA is insensitive to the polarization angle. The absorption rate of TE and TM waves with 0°– 30° oblique incidence is more than 90% in the operating frequency band. The optical transmittance of the absorber is greater than 70% in the whole visible frequency band. Both numerical simulations and experimental results demonstrate the good performance of the proposed MA, thereby enabling a wide range of applications such as antenna design, filter structure, electromagnetic fielding, and electromagnetic compatibility.