基于石墨烯的微波频段动态可调宽带基片集成波导吸波器  

Graphene-Based Dynamically Tunable Broadband Substrate-Integrated Waveguide Absorber in Microwave Frequency Band

作　　者：马家琪 李春树[1] 马鑫[1] 来翔 Ma Jiaqi;Li Chunshu;Ma Xin;Lai Xiang(School of Electronic and Electrical Engineering,Ningxia University,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏大学电子与电气工程学院,宁夏银川750021

出　　处：《光学学报》2024年第20期245-252,共8页Acta Optica Sinica

基　　金：国家自然科学基金(42361075);宁夏大学研究生创新项目(CXXM202402)。

摘　　要：围绕吸波器“轻、薄、宽、强”的发展目标,提出一款基于基片集成波导结构的石墨烯超宽带吸波器。将石墨烯材料蚀刻成有图案的周期结构,通过调控外加偏置电压,使其表面阻抗可调,进而设计出一款频率及吸波能力均动态可调谐的吸波器。该器件工作于微波频段,在15.76~41.73 GHz频段内的吸波率大于90%,相对带宽为90.35%,整体厚度仅为1.66 mm,其具有超宽带吸收及低剖面特性。通过调节方阻变化,该器件在17~40.3 GHz频段内有效实现频率动态调谐。随着方阻自140Ω/sq逐渐增大,反射波增加,吸波模式逐渐向反射模式过渡。基于该器件进一步构成2×2阵列,其在15.77~41.33 GHz频段内的吸波率大于90%。在石墨烯和底部ITO之间加载的偏置电压有众多组合,吸收带宽可任意调制。仿真结果显示,该设计具有低剖面、小型化、集成能力强等优势,具有良好的动态可调谐与强吸收特性。Objective The substrateintegrated waveguide(SIW)is known for its outstanding performance,having numerous advantages such as a low profile,strong compatibility,and high Q factors.Graphene,a twodimensional carbon nanomaterial,excels at microwave frequencies due to its ability to adjust surface impedance through external voltage adjustments.This allows significant change in its resistivity,supporting the theoretical basis for graphene’s use in tunable microwave components.To meet the future objective of lightweight,thin,broad,and strong microwave absorbers,utilizing graphene’s unique properties in absorption can broaden bandwidths,enhance tunability,and reduce profile thicknesses.Despite graphene’s exceptional electronic properties,its performance at millimeter wave frequencies is influenced by factors such as lattice scattering,necessitating further optimization to meet the demands of microwave devices.Consequently,designing graphene microwave devices represents a challenging endeavor.Current research has yet to fully meet the growing demands of absorbers that offer broadband capabilities,miniaturization,lowprofile design,and flexible control.We apply graphene materials to the microwave frequency range and explore ultrawideband absorbing devices utilizing SIW structures,achieving dynamic control over absorption amplitude and frequency.Methods We explore the use of graphene materials in millimeter wave devices.Building on the electromagnetic properties of graphene,an innovative SIW structure is incorporated to etch the graphene into periodic patterns.By adjusting the external bias voltage,the chemical potential and conductivity of the graphene can be controlled,thereby influencing its uniform square resistance.To enhance simulation efficiency,graphene is conceptualized as a twodimensional static resistive film and designed as an impedance boundary condition using the Impedance Boundary operation,with the graphene square resistance as the key simulation parameter.The design process employs HFSS simulation softw

关 键 词：石墨烯材料 微波毫米波 超宽带 基片集成波导 可控吸波器 动态可调 

分 类 号：O441.4[理学—电磁学] TB34[理学—物理]