A Lightweight Ultra‐Wideband Metasurface Microwave Absorber
Fu‐Yan Dong, Chuanning Niu, Mengmeng Zhang, An Wang, Kun Duan, Junming Zhao, Weiren Zhu, Zhongyu Hou
Abstract
Abstract Wideband microwave absorbers hold significant importance in both civilian and military fields. In this paper, a lightweight ultra‐wideband metasurface microwave absorber that covers a frequency range from the ultrahigh‐frequency band to Ku band is presented. The absorber consists of three layers of periodically arranged fourfold rotationally symmetric indium tin oxide (ITO) patterned structures and a reflective surface at the bottom layer separated by polymethacrylimide (PMI) spacers. Such a design enables the absorber to achieve a lightweight construction. The experimental results demonstrate that the absorber exhibits an absorptivity >90% in the 1.3–13.3 GHz band, with a corresponding fractional bandwidth of up to 164.4%. Additionally, the designed absorber features a remarkably lightweight performance with volume density relative to wavelength (VDRW) of just 6.71 mg cm −3 . Furthermore, attributed to its fourfold rotationally symmetric design, the absorber also exhibits polarization insensitivity and excellent angular stability. These unique properties render the proposed wideband absorber highly suitable for a variety of practical applications after reasonable adjustment and optimization.