基于开口谐振环的三层高效电小天线设计
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西南交通大学 物理科学与技术学院 成都 610031

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TN823+.15

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四川省科技厅重点研发项目(2022YFG0248);中央高校基本科研业务费资助项目(2682021GF016)资助


Design of three-layer high-efficiency electrically small antenna based on split resonance ring
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    摘要:

    为提高电小天线的辐射效率,提出一款基于开口谐振环结构的三层小型化环形天线。天线的三层结构分为中间的馈电层和两侧的耦合层,采用电磁耦合方法实现激励。在馈电层设计了一种倒“山”形匹配网络,弥补了传统耦合馈电SRR天线存在部分反向电流的缺陷;通过加载耦合环结构实现强磁耦合,降低天线的金属损耗;在耦合层与馈电层间设计支柱固定的空气间隙,有效地降低介质损耗,从而提高辐射效率。采用电磁仿真软件对天线进行设计,并分析了介质基板对天线性能的影响。对设计的天线进行了实物研制与测试。结果表明,实测结果与仿真结果基本吻合,天线的中心频率为50.03MHz,电尺寸为0.045λ0×0.045λ0×0.01λ0(λ0 为工作波长),其在水平面内具有良好的全向性,辐射效率大于41%。

    Abstract:

    In order to improve the radiation efficiency of the electrically small antenna, a three-layer miniaturized loop antenna based on split resonance ring structure is proposed. The antenna consists of a feeding layer and two coupling layers and is excited by electromagnetic coupling. An E-shaped matching network is designed in the feeding layer to reduce the reverse current, which is the shortcoming of traditional coupling feeder SRR antenna. The coupling ring structure is used to realize strong magnetic coupling and reduce the metal loss. A fixed air gap between the coupling layer and the feeding layer is introduced to effectively reduce the dielectric loss and improve the radiation efficiency. The influence of dielectric substrate on the antenna performances is analyzed by electromagnetic simulation. The proposed antenna is fabricated and measured. The experiment shows that the measured results are basically consistent with the simulated results. The center frequency of the antenna is 50.03MHz, and the electrical size is 0.045λ0× 0.045λ0×0.01λ0 (λ0 is the working wavelength). The antenna has good omnidirectional performance in the horizontal plane, and the radiation efficiency is more than 41%.

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  • 收稿日期:2022-12-29
  • 最后修改日期:2023-03-14
  • 录用日期:2023-03-18
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