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| 基于77 GHz毫米波雷达接收天线的周期性条形阵列解耦结构优化设计方法 |
| An Effective Optimization Method for the Periodic Strip-array Decoupling Structure Based on 77 GHz Millimeter Wave Radar Receiving Antenna |
| 投稿时间：2021-08-06 修订日期：2021-09-25 |
| DOI： |
| 中文关键词: 毫米波雷达天线 条形阵列解耦结构 优化方法 互耦抑制 |
| 英文关键词:Millimeter-wave radar antenna Strip-array decoupling structure Optimization method Mutual coupling suppression |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）（U1806215）；深圳市科技研究发展基金（JSGG20200102155001779） |
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| 中文摘要: |
| 阵列天线是77 GHz毫米波雷达的核心硬件之一，其天线性能决定着雷达的探测能力。由于工作频率的升高以及毫米波雷达小型化、集成化的发展趋势，使得雷达阵列天线阵元间距过密，从而相互干扰出现强互耦效应，严重恶化雷达天线的性能。为了解决上述问题，本文提出了一种基于77 GHz毫米波雷达接收天线的周期性条形阵列解耦结构优化设计方法。该方法通过优化周期性条形阵列解耦结构单元的条形厚度和间距，在保证阵列天线辐射性能的基础上，来抑制毫米波雷达接收天线阵元间的互耦并提高其阵元间的隔离度。仿真结果表明，相比于无解耦结构阵列天线，所提出的解耦结构能够有效地降低毫米波雷达接收天线间的耦合，尤其在中心频率77.75 GHz处互耦减少了13.29 dB。在施加周期性条形阵列解耦结构前后，阵列天线均在77.5 GHz~78.5 GHz指定频段内正常工作，且合成辐射方向图的最大增益几乎保持不变，从而保证了毫米波雷达阵列天线的辐射性能。典型的数值算例能够很好地验证所提方法的有效性。 |
| 英文摘要: |
| Antenna-array is one of the key hardware in the 77 GHz millimeter-wave radar, and the detection ability of millimeter-wave radar is determined by the performances of the array. With the increasing frequency and the development trend of millimeter-wave radar miniaturization and integration, the mutual coupling effect between the elements has a serious impact on radar antenna due to the closely-space arrangement. In order to deal with this problem, this paper proposes an effective optimization method for the periodic strip-array decoupling structure based on 77 GHz millimeter wave radar receiving antenna. In this method, the strip thickness and spacing of the decoupling structure unit are optimized to suppress the mutual coupling and improve the isolations between the elements on the basis of ensuring the normal operation of the array. The simulation results show that, compared with the non-decoupling structure, the proposed decoupling structure can effectively reduce the mutual coupling between the millimeter-wave radar radiating elements, especially the mutual coupling is suppressed by 13.29 dB at 77.75 GHz. With/without the decoupling structure, the antenna-array operates normally in the desired frequency band of 77.5 GHz~78.5 GHz, and the maximum gains of the synthesized radiation patterns remain almost unchanged, thus ensuring the radiation performances of the millimeter-wave radar receiving antenna-array. Typical numerical example can well verify the effectiveness of the proposed method. |
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