| 摘要: |
| 本文提出了一种工作在太赫兹频段的紧凑型高增益、高扫描率双波束漏波天线，该天线由两个具有相同调制周期的半模集成波导（HMSIW）漏波天线和一个功率回收结构组成。前者在HMSIW的顶部表面蚀刻周期性槽以引入人工表面等离子激元（SSPP）慢波效应，通过向周期性槽引入正弦调制，使得在接近SSPP截止频率的窄带宽内实现高扫描率的漏波辐射，后者通过在两个漏波天线之间加功率回收结构，产生两个对称的波束，从而进一步提高了天线的波束扫描率。结果表明，在工作频段1.25～1.31 THz（相对带宽4.6%）内，双波束扫描角度为80°，波束扫描率为17.4，最大增益达到了14.4 dBi，此外天线结构由一维扩展到二维，整体尺寸较小，在太赫兹无线通信和雷达探测系统中具有较大的应用潜力。 |
| 关键词: 漏波天线 高扫描率 半模集成波导 人工表面等离子体激元 |
| DOI：DOI:10.3969/j.issn.1672-2337.2024.06.013 |
| 分类号:TN822+.6 |
| 基金项目:天津市自然科学基金项目（No. 19JCYBJC16100）； 天津市创新创业培训计划项目（No. 202210060027） |
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| High⁃Scanning⁃Rate Terahertz Dual⁃Beam Leaky⁃Wave Antenna Based on Spoof Surface Plasmon Polaritons |
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CHENG Huiqian, BAI Yukun
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School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
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| Abstract: |
| In this paper, a compact high?gain, high?scanning?rate and dual?beam leaky?wave antenna （LWA） opera?ting in the terahertz frequency band is proposed. The antenna consists of two half?mode substrate integrated waveguide （HMSIW） LWAs with the same modulation period and a power?recycling semicircular structure. Firstly, a high?scanning?rate LWA is realized by means of periodically etched slots on the top surface of HMSIW, which introduces the slow wave effect of spoof surface plasmonic polaritons （SSPP）, combined with a sinusoidal modulation which leads to the LWA radiation in the narrow frequency band in proximity to the cutoff frequency of SSPPs. Then, two symmetrical scanning beams are produced by two parallel HMSIW LWAs connected at one end through a semicircular structure, which further enhances the beam scanning rate. It is found that in the operating band of 1.25~1.31 THz （i.e., a relative bandwidth of 4.6%）, the proposed antenna achieves a dual?beam scanning angle of 80°, a beam scanning rate of 17.4, and a maximum gain of 14.4 dBi. In addition, the antenna structure evolves from one?dimension to two?dimensions, exhibiting a small overall size. It can be applied in terahertz wireless communication and radar detection systems. |
| Key words: leaky⁃wave antenna high⁃scanning⁃rate half⁃mode substrate integrated waveguide spoof surface plasmon polaritons |
