Design of Ultrabroadband Metamaterial Absorber With Angle-Insensitive Characteristics Covering the L, S, C, X, and Ku Bands
Zhepeng Hou, Jianlai Cheng, Kong Xiang, Yukun Zou, Hui Pan, Xiaoyu Pang, Shenghui Zhao
Abstract
This letter presents an ultrabroadband metamaterial absorber with angle-insensitive characteristics covering the L, S, C, X, and Ku bands. The proposed metamaterial absorber achieves wave-absorbing properties through the applications of a cross-shaped substrate printed with high-resistance carbon paste and a frequency-dispersive magnetic material (FDMM). Under the combined effect of the two substructures, the absorber realizes an ultra wide absorption band from 0.84 GHz to 20 GHz with at least −10 dB reflectivity. In addition, the proposed composite metamaterial absorber shows a wide-angle absorbing performance for both TE and TM polarized waves, and the angular stability is up to 60° for TM polarization. With the application of the FDMM, the thickness of the metamaterial absorber is limited to 26.5 mm (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$0.074\lambda _{L}$</tex-math></inline-formula>). A prototype is fabricated and measured, and the measurement results agree well with the simulation.