无反射层泡沫夹层结构设计及吸波性能研究EI北大核心CSCD

针对无反射层的电磁隐身需求,本工作对透波层/吸波泡沫/透波层的夹层结构的吸波性能进行仿真计算,据此制备不同电磁参数的吸波泡沫,对其进行电磁特性表征,并研究吸波泡沫夹层结构的雷达散射截面(RCS)性能。结果表明:在吸波泡沫介电常数为2.3~2.7,介电损耗为0.24~0.26时,无反射层的夹层结构在宽频范围内具有最优的吸波性能。加入炭黑吸收剂泡沫的介电常数和介电损耗具有明显的变化规律,吸波PMI泡沫的电磁特性与仿真计算最优吸波泡沫较接近。炭黑质量分数为8%时吸波PMI泡沫夹层结构在2~18 GHz频率范围内具有最优的隐身性能,与仿真计算结果相对应,其通过低频透波、高频吸波实现电磁波隐身。

Design and electromagnetic wave absorbing properties of foam sandwich structure without reflective layer

For the purpose of electromagnetic requirement without reflective layer,the absorbing properties of sandwich structures were calculated.According to the calculated results,different kinds of absorbing foams were prepared and the electromagnetic properties of foams were characterized.The radar cross section(RCS)of wave absorbing foam sandwich structures was also investigated.The calculated results show that sandwich structure has the optimized broadband absorbing property,when dielectric constant is 2.3-2.7 and dielectric loss is 0.24-0.26.There is obvious change law for the dielectric constant of foam with carbon black absorber.The electromagnetic property of PMI foam is close to that of the optimized absorbing foam through calculation.The sandwich structure of wave absorbing PMI foam with 8%(mass fraction)carbon black absorber has the optimized broadband stealth performance,which is corresponding to the calculated result.The sandwich structure can achieve electromagnetic wave stealth through wave transmitting in low frequency band and wave absorbing in high frequency band.