水基超材料宽带大功率微波吸波器  

Broadband High-Power Microwave Absorber Based on Water-Based Metamaterial

作　　者：邓光晟[1,2] 陈文卿 余振春 杨军[1,2] 尹治平[1,2] Deng Guangsheng;Chen Wenqing;Yu Zhenchun;Yang Jun;Yin Zhiping(Special Display and Imaging Technology Innovation Center of Anhui Province,Academy of Opto-Electronic Technology,Hefei University of Technology,Hefei 230009,Anhui,China;Anhui Province Key Laboratory of Measuring Theory and Precision Instrument,School of Instrument Science and Optoelectronics Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学光电技术研究院特种显示与成像技术安徽省技术创新中心,安徽合肥230009 [2]合肥工业大学仪器科学与光电工程学院测量理论与精密仪器安徽省重点实验室,安徽合肥230009

出　　处：《中国激光》2022年第21期69-76,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(61871171);航空科学基金(2020Z0560P4001);中央高校基本科研业务费资助项目(JD2020JGPY0012)。

摘　　要：设计了一种基于介质谐振器的水基微波吸波器。介质谐振器包括两个长方体介质板和一个十字形空腔,并在其内部充满水以实现宽带微波吸收效果。不同于传统水基超材料中相互独立的水基单元,本设计中十字形空腔所形成的水流通道横截面面积达到3 mm×3 mm,可确保阵列中水流畅通,因此该结构满足水冷工作要求,可实现大功率微波的无衰减吸收。仿真结果表明,在21.8~35.9 GHz的微波频段内,吸波器对入射电磁波的吸收率大于90%,相对吸收带宽为48.9%。此外,该吸波器对入射波的偏振不敏感,在宽频段范围内对大入射角电磁波仍有高吸收效果。通过3D打印技术实现了样品加工,实验结果与模拟结果吻合良好。该吸波器在宽带大功率微波吸收领域有较大的应用潜力。Objective Metamaterial microwave absorbers are widely used in many fields,such as radars,stealth technology,electromagnetic compatibility,anti-electromagnetic interference,and sensors.To increase their usability,the functional requirements of absorbers have been also improved,including not only the broadband absorption properties but also wideangle absorption characteristics.Furthermore,polarization insensitivity is now required,while all-dielectric metamaterials absorbers show unique potential in improving impedance matching in wide band.It is interesting to note that water,as an abundant natural resource on earth,possesses a high dielectric constant and large dispersion,which is of great significance for all-dielectric absorber applications.In addition,most of the water-based absorbers proposed in the literature cannot circulate the aqueous solution between the cells,or the cross-sectional area of the water flow channel of the adjacent cells is too small.The fact that most of the microwave energy absorbed by water-based metamaterials is converted into heat,if the water itself cannot circulate and dissipate heat,indicates the accumulated heat will seriously deteriorate the working performance of the absorber.However,if a water-based resonant cell with a larger crosssectional area of the water flow channel is designed,the aqueous solution can be circulated both inside and outside.Hence,the generated heat can be efficiently dissipated during high-power microwave absorption.Methods First,a microwave absorber based on a water-dielectric resonant structure is designed.More specifically,the resonant cell mainly comprises a cruciform water cavity and its respective encapsulation structure.The absorption spectrum of the model is simulated under different polarization angles and incident angles using the finite element method.Moreover,the electromagnetic wave absorption mechanism of the absorber is systematically studied through the distributions of the electric and magnetic fields and power loss density distribution.The

关 键 词：材料 超材料 吸波器 宽带 大功率 水基介质 

分 类 号：O436[机械工程—光学工程]