提出一种柔性超薄吸透一体化电磁窗结构的设计方法,其能够在宽入射角范围内吸收任意极化的电磁波,并且在特定频段内具有几乎透明的透射窗口。测试结果表明,该结构在4.46 GHz时吸收率为93%,在2.86 GHz时透射率为98%,对应的插入损耗为0.09 dB。样品的整体厚度为0.288 mm,超薄的厚度使得该结构柔性可弯曲,易与曲面目标共形。在此基础上,提出宽带吸透一体化电磁窗结构的设计方法,仿真结果表明,在7.7~12.2 GHz吸收率都能达到90%,在4.35 GHz时透射率为90%,且具有宽入射角特性。

This study proposes a novel method for designing an integrated absorption-transmission flexible ultrathin electromagnetic window, which can absorb the unpolarized incident waves over a wide range of angles and is almost transparent at a given frequency band. The experimental results demonstrate 93% absorption at 4.46 GHz and 98% transmittance at 2.86 GHz, indicating an insertion loss of 0.09 dB. The total sample thickness is 0.288 mm, which makes the structure flexible and easy to conform to the curved target. Furthermore, a method for designing a broadband-integrated absorption-transmission electromagnetic window is proposed. The simulation results denote that the absorption can reach 90% at 7.7-12.2 GHz and that the transmittance is 90% at 4.35 GHz. The proposed broadband structure performs appropriately over a wide range of incident angles.