全向及定向圆极化天线的小型化研究
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TN820

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Australian Research Council under Grant DP160102219;UTS Early Career Researcher Grant (PRO17-4544)


Miniaturization techniques for omnidirectional and unidirectional circularly polarized antennas
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    摘要:

    本文提出了两种分别应用于全向以及定向圆极化天线的小型化设计.这两种天线设计方案是基于电偶极子与磁偶极子的有机结合.全向圆极化方向图具有很广的覆盖范围及避免极化失配的特点,非常适合应用于移动物联网以及卫星间通信等.对于两组水平放置的电磁偶极子,如果采用等幅激励且相位相差90°,会产生全向的圆极化方向图.本文介绍了一种工作在下一代移动通信28 GHz频率的呈车轮形的紧凑全向圆极化天线.整个天线印刷在直径仅4 mm的圆形介质板上,且具有宽带高效率等良好电器特性,非常适合应用于5G小型化移动通信终端.定向圆极化天线具有高增益且避免极化失配的特点,广泛应用于卫星移动通信终端中.两组正交放置的电磁偶极子如果等幅且同向激励,会产生定向呈心形的辐射方向图.本文还介绍了一种电小且高辐射效率的惠更斯天线,该天线有机结合了两个电小的辐射单元,形成结构紧凑的定向圆极化天线,非常适合卫星通信以及无线能量传输等应用.

    Abstract:

    This paper introduces two miniaturized antennas for either omnidirectional or unidirectional radiation. These two antenna designs are based on the manipulation of two electric and magnetic radiators. First, omnidirectional CP antennas have broad radiation coverage and can avoid the polarization mismatch problem, which are suitable for device-to-device (D2D) and satellite communications. Two horizontally placed electric and magnetic radiators excited with equal amplitude and 90 degree phase difference can produce omnidirectional CP pattern. This paper will present a 28 GHz compact wheel-shaped omnidirectional CP antenna. The entire antenna is printed on a dielectric disk with the diameter of only 4 mm. It has broad bandwidth and good electrical characteristics, which is ideal for compact 5G mobile terminals. Second, unidirectional CP antennas have high directivity and can avoid polarization mismatch problem, which have been widely used in satellite mobile terminals. Two orthogonally placed electric and magnetic radiators excited with equal amplitude and phase produce unidirectional cardioid-shaped radiation pattern. This paper will introduce an electrically small unidirectional CP antenna, which organically combines two metamaterial-inspired electric and magnetic radiator into a compact entity. This antenna is ideal for satellite communication and wireless power transfer applications.

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蔺炜.全向及定向圆极化天线的小型化研究[J].南京信息工程大学学报(自然科学版),2019,11(1):1-7
LIN Wei. Miniaturization techniques for omnidirectional and unidirectional circularly polarized antennas[J]. Journal of Nanjing University of Information Science & Technology, 2019,11(1):1-7

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  • 收稿日期:2018-11-28
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  • 在线发布日期: 2019-01-30
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