An Ultra-Wideband Multilayer Absorber Using an Equivalent Circuit-Based Approach
An Ultra-Wideband Multilayer Absorber Using an Equivalent Circuit-Based Approach
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DOI：
10.1109/tap.2022.3213415
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发表时间：
2022-12
影响因子：
5.7
通讯作者：
Yue Li;P. Gu;Zi He;Zihao Cao;Jun Cao;K. Leung;Dazhi Ding
中科院分区：
文献类型：
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作者：
Yue Li;P. Gu;Zi He;Zihao Cao;Jun Cao;K. Leung;Dazhi Ding
提出了一种基于等效电路模型（ECM）的超宽带（UWB）吸波器设计方法。为了验证该方法的准确性，对多层吸波材料的结构参数进行了全波仿真计算。仿真结果表明，采用ECM技术可以快速获得理想的频率响应，如单窄吸收带、双吸收峰和超宽吸收带等。制作了一个20 × 20的四层吸收体，在2.1 ~ 37.5GHz的频率范围内获得了10 dB的雷达散射截面衰减，带宽比为17.62：1。单元结构的总尺寸为280 × 280 × 14 × 14 × mm ^{3}$（1.96 × 1.96 × 0.098 × 1.96 × 0.098 × 0.098），在30°和60°的共形柱体上具有稳定的响应。此外，为了减小U波段以上高阶模的影响，引入空间映射（SM）技术对吸波体参数进行优化，大大扩展了吸波体的高频吸收带宽。在3 ~ 94 GHz范围内获得了10 dB的RCSR，BWR为31.33：1。
An ultrawideband (UWB)absorber designed by equivalent circuit model (ECM) is presented in this article. The structural parameters of multilayer absorbers were calculated for full-wave simulation so as to verify the accuracy of this method. The simulation results illustrated that the ideal frequency response can be easily and quickly obtained by using ECM, such as single narrow absorption band, dual-band absorption peak, and ultrawide absorption band. A $20\times20$ quadruple-layer absorber was fabricated and tested, which obtained 10 dB radar cross Section reduction (RCSR) from 2.1 to 37.5 GHz with bandwidth ratio (BWR) of 17.62:1. The overall dimension of the unit cell structure is $280\times 280\times 14\,\,{\mathrm{ mm}}^{3}$ ( $1.96\lambda _{\max } \times 1.96\lambda _{\max } \times 0.098\lambda _{\max } $ ), and the absorber exhibits stable response on conformal cylinders with central angles of 30° and 60°. Moreover, in order to reduce the influence of high-order modes above U-band, the space mapping (SM) technique was introduced to optimize the absorber’s parameters, which greatly expanded the high-frequency absorption bandwidth. A 10 dB RCSR was achieved from 3 to 94 GHz with BWR of 31.33:1.