一种圆柱形超表面透镜的设计及其在天线增益增强中的应用  

Design of cylindrical metasurface lens and its application in enhancement of antenna gain

作　　者：周文君 尚玉平 廖成[1] ZHOU Wenjun;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》2020年第8期70-76,共7页Electronic Components And Materials

基　　金：国家自然科学基金(61601379,61771407);中央高校基本科研业务费资助项目(2682018CX41)。

摘　　要：研究了一种可共形于圆柱表面的电磁超表面透镜。通过设计沿圆周方向变化的透射相位梯度,对于横电和横磁两种极化的平面电磁波照射,均在圆柱形透镜焦点处观察到了聚焦场强。为了分析圆柱形超表面透镜对天线辐射增益的提升效果,在其焦点处放置一副作为馈源的微带贴片天线单元,由此获得圆柱形超表面透镜天线。与馈源天线相比,圆柱形超表面透镜天线可在工作频率10 GHz处将横电和横磁两种极化的主瓣增益分别提升11.23 dB和11.44 dB。仿真和测量结果的一致性验证了设计的有效性。An electromagnetic metasurface lens which can be conformal to a cylindrical surface was presented.Through designing the transmission phase gradient that varied along the circumferential direction of the cylinder,focused field strength was observed at the objective focal point for the illumination of the plane electromagnetic wave with transverse magnetic or transverse electric polarization.In order to evaluate the enhancement effect of antenna radiation gain by the cylindrical lens,a microstrip patch antenna element,which serves as a feeding,was placed at the focal point of the lens.And a cylindrical lens antenna was constructed.Compared with the feeding antenna,the cylindrical lens antenna can enhance the boresight gain by 11.23 dB and 11.44 dB for transverse electric and transverse magnetic polarizations,at the operating frequency 10 GHz,respectively.The design was validated by the agreement between the simulation and measurement results.

关 键 词：波束聚焦 共形透镜 相位梯度超表面 高增益天线 透镜天线 

分 类 号：TN957.2[电子电信—信号与信息处理]