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提出了一种基于PMA单元结构的超薄宽带完美吸波屏设计方法.该方法将多层拓展带宽的技术与单层多谐振方法有机结合,实现带宽拓展的同时,保持了完美吸波屏结构简单、无集总元件的特点,易于实际加工和应用.以双层三谐振超薄宽带完美吸波屏为例,结合其等效电路,理论上验证了所设计吸波屏的吸波机理,同时验证了方法的有效性.仿真分析该吸波屏具有低雷达散射截面、极化不敏感和宽入射角的特征.仿真和实测结果表明:该吸波屏在厚度为0.01λ的条件下,具有14.1%的半波功率带宽;-3dBsm的雷达散射截面缩减带宽为18.9%,在法线方向的最大缩减量为23 dBsm,在法向±40°内具有较好的雷达散射截面减缩效果.
A design method based on the PMA unit structure is proposed, which is based on the design of an ultra-thin broadband perfect absorbing screen. This method combines multi-layer expanding bandwidth technology with single-layer multi-resonance method to achieve bandwidth expansion while maintaining the perfect structure of absorbing screen Simple and non-lumped component, which is easy to be processed and applied.With the double-layer triple-resonance ultra-thin broadband perfect absorbing screen as an example, combining with its equivalent circuit, the absorbing mechanism of the designed absorbing screen is theoretically verified, At the same time, the effectiveness of the method is validated.The simulation results show that the screen has the characteristics of low radar cross section, polarization insensitivity and wide angle of incidence.The simulation and experimental results show that under the condition of the thickness of 0.01λ, With a half-wave power bandwidth of 14.1%. The -3dBsm radar cross-section has a reduced bandwidth of 18.9% and a maximum reduction of 23 dBsm in the normal direction, with a good radar cross section reduction effect in the normal ± 40 °.