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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%。
The paper presents a compact broadband high gain planar Yagi antenna based on artificial electromagnetic loading. The antenna adopts the microstrip Yagi antenna as the basic feeding structure, and the antenna obtains the broadband high gain characteristic by loading the “I” shaped sub-wavelength resonant structure. The antenna consists of a stepped microstrip feeder, an improved ground plane structure, a half-wavelength microstrip parasitic strip, and a manual electromagnetic steering structure. The stepped microstrip feeder structure and the parasitic strips enable the antenna to achieve a wider impedance bandwidth while maintaining the compactness of the structure. The use of artificial electromagnetic structure as the director can improve the antenna gain in the wideband range. The test results show that the designed antenna impedance bandwidth reaches 98% (3.87GHz ~ 10.71GHz), and the radiation pattern of the antenna has good consistency throughout the operating frequency range with the maximum gain of 8.76dBi in the main radiation direction, the minimum value Is 3.74dBi, 3dB gain bandwidth is 43.2%.