加载人工电磁结构的宽带高增益平面八木天线  

Planar Printed Planar Yagi Antenna with Wide Bandwidth and High Gain Based on Metameterial Structures

作　　者：王茜茜[1] 钱祖平[2] 曹文权[2] 蔡洋[3] 

机构地区：[1]解放军理工大学通信工程学院研究生2队,江苏南京210007 [2]解放军理工大学通信工程学院 [3]解放军理工大学通信工程学院研究生4队

出　　处：《军事通信技术》2016年第2期46-48,共3页Journal of Military Communications Technology

摘　　要：文章提出了一款基于人工电磁结构加载的紧凑型宽带高增益平面八木天线。天线采用微带八木天线作为基本馈电结构,通过加载"I"字形亚波长谐振结构使天线获得宽带高增益特性。该天线由阶梯式微带馈电线、改进型接地平面结构、半波长微带寄生条带和人工电磁引向结构四部分组成。阶梯式微带馈线结构和寄生条带能使天线在保持结构紧凑的特性的同时实现较宽的阻抗带宽;采用人工电磁结构作引向器能在宽带范围内提高天线增益。测试结果表明,设计的天线阻抗带宽达到98%(3.87GHz^10.71GHz),在整个工作频段范围内,天线的辐射方向图具有很好的一致性,主辐射方向最大增益为8.76dBi,最小值为3.74dBi,3dB增益带宽为43.2%。A new compact printed planar Yagi antenna with wide bandwidth and high gain based on metamaterial structure was proposed. A planar printed quasi-Yagi antenna was adopted as the feeding structure and I-shaped sub-wavelength resonant structures were loaded so as to fur- ther enhance the radiating performance. The antenna consists of stepped microstrip feeding line, modified ground plane, parasitic strip and metamaterial. Wide impedance bandwidth of the pro- posed antenna with compact size can be achieved by designing a feeding line with stepped struc- ture and adding parasitic strip. Moreover, I-shaped metamaterial structures, which were used as directing elements, could further improve the gain in the operating band. Measured results show that the impedance bandwidth is 98 % （3.87 GHz- 10.71 GHz）. In the whole operating band, the radiation pattern has good consistency. The minimum of gain is 3.74 dBi and the maximum of gain is 8.76 dBi in the main radiating direction. The 3 dB gain bandwidth is 43.2 %.

关 键 词：超宽带 八木结构 高增益 人工电磁结构 

分 类 号：TN713[电子电信—电路与系统]