Abstract:Microwave absorbers can reduce microwave reflections when covering the surface of an object, and are widely used in the fields of communications, aerospace, defense and military, etc. However, it is difficult to balance the absorption bandwidth, size, and absorptivity of the microwave absorber with the conventional structure. In this paper, based on a fractal structure, In this paper, a single-layer broadband metasurface structure is proposed based on fractal structures, and the finite-difference time-domain (Finite-Difference Time-Domain) method is used for solving it. It is shown that the structure provides high absorption of more than 80% in the broadband frequency range from 10.1 GHz to 15.9 GHz and has ultrathin characteristics with a thickness of 1.37 mm, which is about 0.046 (λ is the wavelength of the lowest frequency, 10.1 GHz). The metasurface has a second-order Scherbinski fractal structure as the structural unit, and further analysis shows that the absorber has a fractional bandwidth fractional bandwidth（FBW) of 86% and still absorbs efficiently at an incidence angle of 40°. The device provides broadband microwave absorption with a simple structure, which has important application prospects in the fields of stealth technology, electromagnetic compatibility, and communication technology.