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一般情况下，当偶极子天线工作于二次模时，振子臂的末端馈电点处为电流零点，会呈现极大的输入阻抗，难以与外端口匹配。为了解决该问题，提出一种面向5G应用的工作于二次模和三次模的双模边射压缩偶极子天线。首先，引入馈电巴伦显著增加了馈电结构与振子臂的接触面积，增大了平均馈电电流，从而有效降低了二次模的输入阻抗，使该模式易于匹配；接着，通过在二次模的电压零点处加载枝节，使得三次模与二次模相合并从而获得双模工作效果，与传统的单模压缩偶极子天线相比，本天线具有更宽的阻抗带宽；然后，设计了一种人工磁导体(artificial magnetic conductor,AMC)反射板，该反射板在天线工作中心频率处具有零度反射相位，可将天线的整体剖面高度从传统的约1/4波长大幅降至约1/9波长；最后，对该设计进行了理论仿真分析和实验测试验证。测试结果表明：该天线可覆盖3.19～3.71 GHz频段，其阻抗带宽为15.1%，最高增益为9.2 dBi，整体剖面高度仅为0.11λ0，与典型偶极子天线相比，该设计具有更紧凑的天线尺寸，更宽的带宽及更小的旁瓣。该天线性能良好，在未来5G无线通信系统中具有良好的应用潜力。
Abstract：When the dipole works at the second mode, the current on the feed point which is located at the end of the dipole arm is zero. Thus, the second-order mode of a dipole has an extremely large input impedance and is difficult to realize impedance matching. To solve this problem, a broadside dual-mode compressed dipole resonating at the second-order and third-order modes is proposed for 5G applications. First, a feeding balun is introduced to enlarge the contact area between feeding structure and the dipole. In this situation, the average current on the contact area is significantly increased, resulting in the effective reduction in the input impedance of the second-order mode, which makes it an excellent impedance-matching network. Then, by employing a stub-loaded dipole, the third-order mode combines with the second-order mode to obtain a dual-mode wideband operation. Compared with the reported compressed dipoles, the proposed antenna shows a wider impedance bandwidth. Furthermore, an artificial magnetic conductor(AMC) reflector is designed. Due to zero reflection phase of AMC structure at the center frequency, the overall profile of the antenna can be greatly reduced from the traditional 1/4 wavelength to about 1/9 wavelength. Finally, the design is verified by the simulation analysis and experimental measurement. The measured results show that the proposed antenna can cover 3.19～3.71 GHz, achieving an impedance bandwidth of 15.1%. Meanwhile, the peak gain is9.2 dBi, and the overall profile is only 0.11λ0. Compared with the typical dipole antennas, the proposed design has a more compact antenna size, a wider bandwidth and smaller sidelobes. The antenna has a good performance, showing great potential in future 5G wireless communication applications.
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基本信息:
DOI：10.12194/j.ntu.20210905001
中图分类号:TN821.4
引用信息:
[1]丁鑫浩,杨汶汶,陈建新.一种低剖面宽带边射双模压缩偶极子天线[J],2022,21(03):35-41.DOI:10.12194/j.ntu.20210905001.
基金信息:
国家自然科学基金面上项目（62071256）