An ultra-wideband metamaterial absorber is developed, which is polarized-insensitive and angular-stable. Three layers of square resistive films comprise the proposed metamaterial. The optimal values of geometric parameters are obtained, such that the designed absorber can achieve an ultra-broadband absorption response from 4.73 to 39.04 GHz (relative bandwidth of 156.7%) for both transverse electricity and transverse magnetic waves. Moreover, impedance matching theory and an equivalent circuit model are utilized for the absorption mechanism analysis. The compatibility of equivalent circuit calculation results, together with both full-wave simulation and experimental results, demonstrates the excellent performance and applicability of the proposed metamaterial absorber.

研制了一种偏振不敏感、角度稳定的超宽带超材料吸收体。三层方形电阻膜包括所提出的超材料。获得了几何参数的最优值，使得所设计的吸收体对于横向电波和横向磁波都可以实现4.73~39.04GHz（相对带宽为156.7%）的超宽带吸收响应。此外，阻抗匹配理论和等效电路模型用于吸收机理分析。等效电路计算结果的兼容性，以及全波模拟和实验结果，证明了所提出的超材料吸收器的优异性能和适用性。