Li Kai, Lu Haipeng, Bi Mei, He Wentao, Qi Lun, Zhou Zhangrong, Weng Xiaolong
National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
Polymers (Basel). 2022 Apr 13;14(8):1576. doi: 10.3390/polym14081576.
A design method of five-band polarization-insensitive metamaterial absorber (MMA) based on the slotted structures and the magnetic rubber is proposed for L-, S-, C-, X-, and Ku-band applications. The slotted structures of the top layer, which evolved from two square rings, are used to excite multi-resonance. The range of the electromagnetic (EM) parameters of a magnetic rubber substrate, which is used to adjust the equivalent impedance of the absorber to match the free space impedance in different bands, is estimated using the impedance matching principle. A series of magnetic rubber substrates based on the estimated EM parameters are prepared and measured, whose thickness is only 0.7 mm, meeting the thin design requirements. The absorption of the proposed absorber greater than 90% at 1.7 GHz, 3.87 GHz, 5.96 GHz, 9.4-10.4 GHz, and 14 GHz is achieved when the doping amount of the carbonyl iron powders is 200%. The absorbing performance of the absorber with measured EM parameter agrees well with the theoretical estimates, which validates the accuracy of the proposed design method.
提出了一种基于开槽结构和磁性橡胶的五波段偏振不敏感超材料吸收器（MMA）的设计方法，用于L、S、C、X和Ku波段应用。顶层的开槽结构由两个方环演变而来，用于激发多共振。利用阻抗匹配原理估算了用于调节吸收器等效阻抗以匹配不同频段自由空间阻抗的磁性橡胶基板的电磁（EM）参数范围。制备并测量了一系列基于估算电磁参数的磁性橡胶基板，其厚度仅为0.7毫米，满足薄型设计要求。当羰基铁粉的掺杂量为200%时，所提出的吸收器在1.7吉赫兹、3.87吉赫兹、5.96吉赫兹、9.4 - 10.4吉赫兹和14吉赫兹处的吸收率大于90%。具有实测电磁参数的吸收器的吸收性能与理论估算结果吻合良好，验证了所提出设计方法的准确性。
