摘要
在分析传统Salisbury吸波屏的工作原理的基础上，阐述了通过嵌入带损频率选择表面（lossy FSS）来提高吸波性能的可行性，并基于该方案设计了一款能够在3.5～18.5 GHz频率范围内（相对带宽为136%）有效吸波的超宽带吸波结构，这种带损频率选择表面被嵌入在高阻表面（377？/□）和反射面之间。分析了该结构中的附加电阻大小、FSS单元结构和几何尺寸等不同参数对吸波性能的影响，并通过理论分析、计算仿真和实物测量，证实了在厚度相同的情况下，通过加载带损FSS可以使传统Salisbury吸波屏提高约62%的相对带宽，对雷达吸波材料的研发具有一定的指导意义。
The feasibility of embedding lossy-frequency selective surface （FSS） into Salisbury screen to construct composite radar absorbing materials （RAM） was investigated, and an ultra-wideband RAM was designed to provide effective radar absorption in the frequency range of 3.5 GHz to 18.5 GHz （with relative bandwidth of 136%）. The lossy FSS was sandwiched between a plain resistive sheet with resistivity of 377？/□ and a copper ground plane. The performance of the proposed RAM structure was validated and evaluated through analytical study, numerical modeling and lab measurement. The correlation of lumped resistance and the design parameters of the FSS unit cell with the reflectivity of the RAM were also discussed. The results reveal that by tuning the lumped resistors and geometrical parameters of the lossy FSS, the individual absorption bands of the RAM can be merged to yield an ultra-wide absorption band, rendering a 62% bandwidth enhancement in comparison to a conventional Salisbury screen with same thickness.
出处
《电子元件与材料》
CAS
CSCD
2015年第6期82-86,共5页
Electronic Components And Materials
基金
国家自然科学基金资助(No.61061002
61261005)
