Ultrawideband and High Absorption Composite Absorber Enabled by Double Layers of Metasurface Complementary Enhancement Design

被引：0
|
作者：
Ma, Zhe-Yi-Pei [1 ,2 ]
Jiang, Chao [1 ,2 ]
Liu, Yan-Qiong [1 ,2 ]
Li, Jia-Le [1 ,2 ]
机构：
[1] Institute of Powder Metallurgy Research, Central South University, Hunan, Changsha,410083, China
[2] State Key Laboratory of Powder Metallurgy, Hunan, Changsha,410083, China
来源：
Tien Tzu Hsueh Pao/Acta Electronica Sinica | 2024年 / 52卷 / 08期
关键词：
In this study; a design method of multilayer structure composite absorber based on double layers of metasurface is proposed. The designed composite absorber consists of two layers of metasurface; top absorption enhanced skin and several support dielectric slabs. The unit cells of metasurface I and Ⅱ are separately irregular-shaped metal patches connected by chip resistors and hexagonal metal rings loaded with chip resistors; the top absorption enhanced skin is a fiberglass enforced epoxy laminate; support dielectric slabs adopt PMI foam. The simulation results indicate that the absorption frequency bands with reflection coefficients below -10 dB and -20 dB are 2.80~23.64 GHz and 3.56~22.56 GHz; respectively. The measurement results show that; the absorption frequency bands with reflection coefficients below -10 dB and -20 dB are 2.36~23.87 GHz and 3.17~23.16 GHz; respectively; the reflection coefficient curves obtained by simulation and test have good consistency; which verifies the effectiveness of the design method. The simulation and test results show that the frequency band of -10 dB reflection coefficient at 50° oblique incidence is basically consistent with that at normal incidence; while the offset of start and stop frequencies is less than 0.8 GHz; further; the simulation and test results show that when the oblique incidence angle is 60°; the fractional bandwidth of the reflection coefficient below -10 dB is up to 141.8%; which indicates that the composite absorber designed in this study has the incidence stability in a wide angle range. In addition; the mechanism of ultrawideband and high absorption of the structure and the influence of the main structure parameters are analyzed; the results demonstrate that the top absorption enhanced skin can improve absorptivity of the whole structure by up to 0.2(1.0 represents 100% absorption); and the complementary enhancement design of the two layers of metasurface absorption frequency bands can improve oblique incidence stability obviously. © 2024 Chinese Institute of Electronics. All rights reserved;
D O I：
10.12263/DZXB.20230609
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页码：2668 / 2678
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