基于磁偶极子加载的机翼后向散射增强设计  

Backscattering enhancement design of airfoil through magnetic dipole loading

作　　者：冯桂生 尚玉平 廖成[1] FENG Guisheng;SHANG Yuping;LIAO Cheng(Institute of Electromagnetic Field and Microwave Technology,School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院电磁场与微波技术研究所,四川成都610031

出　　处：《电子元件与材料》2023年第5期618-624,共7页Electronic Components And Materials

基　　金：国家自然科学基金(61601379,61771407)。

摘　　要：针对掠入射条件下机翼的后向雷达散射截面增强问题,提出了一种基于磁偶极子谐振的低剖面加载设计。由两个在平面电磁波激励下腔内产生磁偶极子谐振的介质谐振器紧密级联构成具有增强散射特性的超单元,两个介质谐振器内部接近等幅反相的电场与磁场分布形成准超方向性再辐射,由此贡献于后向雷达散射截面增强。进一步,结合镜像原理,将超单元以组阵方式贴附于机翼节段侧立面与下表面,以对φ极化和θ极化掠入射波实现后向雷达散射截面增强。全波仿真结果表明,对于φ极化和θ极化的15°掠入射波,通过超单元阵列加载,机翼节段在设计频率9 GHz处的后向雷达散射截面分别得到了13.34 dB和19.27 dB的增强。对所加工样件的后向雷达散射截面进行了实验测量,实测结果和全波仿真结果吻合良好,验证了该设计的有效性。A low-profile coating design based on the magnetic dipole resonance was presented to address the problem of backscattering cross-section enhancement of airfoil at grazing incidence.Two identical dielectric resonators that generating magnetic dipole resonance under the illumination of a plane electromagnetic wave were closely cascaded to form a supercell with augmented scattering characteristics.The electric and magnetic field distributions within the two dielectric resonators with almost equal amplitude but opposite phase result in quasi-superdirective reradiation,which effectively contributes to the backscattering cross-section enhancement.Further,through the use of the image theory,the arrays consisting of supercells were attached onto the side and bottom surfaces of an airfoil segment model so as to achieve backscattering cross-section enhancement forφ-polarized andθ-polarized grazing incidence.As for theφ-polarized andθ-polarized 15°grazing incidence,the full-wave simulation results indicate that backscattering cross-section of the airfoil at the design frequency of 9 GHz can be enhanced by 13.34 dB and 19.27 dB,respectively,through the supercell array loading.In addition,the experimental measurement of backscattering cross-section was conducted for the fabricated prototype.The relatively good agreement between the simulation and measured results validated the presented design.

关 键 词：雷达诱饵 后向雷达散射截面 介质谐振器 磁偶极子 

分 类 号：TN972[电子电信—信号与信息处理]