【摘要】 窄带吸波体因其对频率的高灵敏度特性，已广泛应用于信号探测、成像、远程遥感等技术领域，为此设计一个结构简单的高吸收率窄带吸波体。该吸波体基于传统方环形金属频率选择表面结构，通过在其介质层上添加一条石墨烯条带，利用石墨烯的阻抗特性调节单元结构在谐振频率处的阻抗匹配，从而在保持窄带特性的同时显著提高吸收率。仿真结果表明：该吸波体的相对吸收带宽约为1%;在5.032 GHz谐振频率下，传统吸波体的吸收率仅为99.7%,而该吸波体可达99.999 9%,基本实现完美吸波。该吸波体的反射系数和表面介质折射率均与谐振频率呈近似线性关系，因此可应用于检测相对介电常数为2～8的待测物的传感器，其折射率灵敏度为636.8 GHz。经验证，该窄带吸波体具有极高的吸收率，且作为传感器应用时，仍能保持90%以上的吸收率。更多还原

【Abstract】 Narrowband absorbers have been widely used in technical fields such as signal detection, imaging, and remote sensing due to their high sensitivity to frequency. Therefore, a narrowband absorber with a simple structure and high absorption rate is designed. This absorber is based on the traditional square-ring-shaped metal frequency-selective surface structure. By adding a graphene strip on its dielectric layer and using the impedance characteristics of graphene to adjust the impedance matching of the unit structure at the resonant frequency, the absorption rate can be significantly improved while maintaining the narrowband characteristics. The simulation results show that the relative absorption bandwidth of the absorber is approximately 1%. At the resonant frequency of 5.032 GHz, the absorption rate of the traditional absorber is only 99.7%, while that of this absorber can reach 99.999 9%, basically achieving perfect absorption. The reflection coefficient and the refractive index of the surface medium of this absorber are approximately linearly related to the resonant frequency. Therefore, it can be used as a sensor for detecting the test object with a relative dielectric constant of 2 to 8, and its refractive index sensitivity is 636.8 GHz. It has been verified that this narrowband absorber has an extremely high absorption rate, and when used as a sensor, it can still maintain an absorption rate of more than 90%.更多还原