Design of a Wideband Horizontally Polarized Omnidirectional Antenna With Mutual Coupling Method
Design of a Wideband Horizontally Polarized Omnidirectional Antenna With Mutual Coupling Method
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DOI：
10.1109/tap.2015.2429733
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发表时间：
2015-05
影响因子：
5.7
通讯作者：
Zedong Wang;Yingzeng Yin;Xi Yang;Jianjun Wu
中科院分区：
文献类型：
--
作者：
Zedong Wang;Yingzeng Yin;Xi Yang;Jianjun Wu
本文提出了一种宽带水平极化全向天线，该天线由12个印刷弧形振子单元、宽带1-12馈电网络、2排寄生弧形条和1排指向元件组成。基于紧耦合振子阵列设计，将12个印刷圆弧振子（约0.2λL，λL：低频有效波长）形成一个环形，边缘重叠，以实现强互耦。同时，两排寄生弧形条径向放置在这些弧形偶极子周围作为阻抗匹配层。由于强互耦和阻抗匹配层，所提出的HP全向天线具有宽带工作频带。另外，利用一排指向矢元件来增强水平面内的辐射。印刷的弧形偶极子由具有相同幅度和相位的宽带1到12功率分配器馈电。实验结果表明，该天线具有70.2%的10 dB回波损耗工作带宽（1.7-3.54 GHz）和良好的全向性能，在1.7-3.2 GHz范围内，水平面增益变化小于1.2 dB。
A wideband horizontally polarized (HP) omnidirectional antenna is proposed in this communication, which consists of 12 printed arc dipole units, a wideband 1-to-12 feed network, 2 rows of parasitic arc strips, and a row of director elements. Based on the tightly coupled dipole array design, 12 printed arc dipoles (about 0.2λL, λL: effective wavelength at low frequency) are formed as a ring with their edge overlap for strong mutual coupling. Meanwhile, the two rows of parasitic arc strips are radially placed around these arc dipoles as an impedance matching layer. Owing to the strong mutual coupling and impedance matching layer, the proposed HP omnidirectional antenna has a wideband operating band. Additionally, a row of director elements is utilized to enhance the radiation in horizontal plane. The printed arc dipoles are fed by a wideband 1-to-12 power divider with identical magnitude and phase. Experimental results show that this antenna has a wide 10-dB return loss operating bandwidth of 70.2% (1.7-3.54 GHz) and good omnidirectionality performance with gain variation in horizontal plane being less than 1.2 dB among 1.7-3.2 GHz.