利用容性频率选择表面改善单层雷达吸波材料吸波性能

Improvement of the absorbing properties of single layer Radar Absorbing Materials using Capacitive Frequency selective surfaces

本文分析了等效电路法对含容性频率选择表面(capacitive FSS)单层吸波材料(RAM)反射率计算的不足,并用有限元法对此结构吸波材料吸波性能进行了计算。结果表明:当FSS位于较靠近金属背衬位置时,反射率曲线出现双峰,带宽增加;当其位于吸波材料表面时可以明显改善吸波材料低频性能。通过实验验证,计算与实验结果较吻合,两者均证明容性FSS能有效改善单层雷达吸波材料的吸波性能,具有较好的应用前景。

In this paper, the disadvantages of calculating the absorbing properties of single layer radar absorbing materials containing capacitive FSSs using equivalent circuit method were analyzed, and the absorbing properties were studied by finite element method. The calculated results indicate that the band- widths will be broadened while the capacitive FSSs are close to the conducting plate and the absorbing properties at low frequency can be improved when the capacitive FSSs are on the surfaces of the RAMs, which are in agreement with experimental results. So, the capacitive FSSs can improve the absorbing properties of the single layer RAMs significantly, and have better application future in the RAMs.