In this article, a wideband filtering-radiating Yagi dipole antenna with the coplanar stripline (CPS) excitation form is investigated, designed, and fabricated. By introducing an open-circuited half-wavelength resonator between the CPS structure and dipole, the gain selectivity has been improved and the operating bandwidth is simultaneously enhanced. Then, the intrinsic filtering-radiating performance of Yagi antenna is studied. By implementing a reflector on initial structure, it is observed that two radiation nulls appear at both lower and upper gain passband edges, respectively. Moreover, in order to improve the selectivity in the upper stopband, a pair of U-shaped resonators are employed and coupled to CPS directly. As such, the antenna design is finally completed with expected characteristics. To verify the feasibility of the proposed scheme, a filtering Yagi antenna prototype with a wide bandwidth covering from 3.64 GHz to 4.38 GHz is designed, fabricated, and measured. Both simulated and measured results are found to be in good agreement, thus demonstrating that the presented antenna has the performances of high frequency selectivity and stable in-band gain.

中文翻译：

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具有滤波辐射性能的共面带状线馈电宽带八木偶极天线

本文研究，设计和制造了具有共面带状线（CPS）激励形式的宽带滤波辐射八木偶极天线。通过在CPS结构和偶极子之间引入开路半波长谐振器，可以提高增益选择性并同时提高工作带宽。然后，研究了八木天线的固有滤波辐射性能。通过在初始结构上安装反射器，可以观察到两个辐射零点分别出现在上下增益通带边缘。此外，为了提高在上阻带中的选择性，采用了一对U形谐振器并直接耦合到CPS。这样，天线设计最终以期望的特性完成。为了验证该方案的可行性，设计，制造和测量了一个滤波器Yagi天线原型，该天线的带宽范围从3.64 GHz到4.38 GHz。仿真结果与测量结果均吻合良好，表明所提出的天线具有较高的频率选择性和稳定的带内增益性能。