| 蒋旭中,冷开茂,樊薇.一种近距离位移测量环形探针嵌套收发天线设计[J].电子测量与仪器学报,2026,40(5):145-155 |
| 一种近距离位移测量环形探针嵌套收发天线设计 |
| Design of a nested transceiver loop probe antenna forclose-range displacement measurement |
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| DOI： |
| 中文关键词: 位移测量 环形探针天线 模态抑制 嵌套结构 极窄带宽 |
| 英文关键词:displacement measurement loop probe antenna modal suppression nested structure very narrow bandwidth |
| 基金项目:国家自然科学基金（52375100）、江苏省自然科学基金（BK20240156）、江苏省双创团队（JSSCTD202448）和中国科协青年人才托举工程（2022QNRC001）资助项目 |
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| 摘要点击次数: 215 |
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| 中文摘要: |
| 毫米级近距离位移测量在精密制造、医疗监测、航空航天等领域应用广泛。微波法凭借非接触、抗干扰性强和空间分辨率适中等优势，成为近距离位移测量的有效手段。针对环形探针天线存在多频谐振和天线尺寸与性能难以兼容的问题，提出一种基于模态抑制的四元扇形截断结构和利用嵌套式布局的环形探针收发天线，能够有效抑制传统环形天线的多频点谐振现象，实现单一目标频点（24.01 GHz）的高效辐射并提升信号接收纯度与抗干扰能力。仿真结果表明，该天线在保留高增益特性的同时，尺寸较同类典型环形天线缩减65.385%，工作带宽小于0.1%，目标频点反射系数为-64.001 dB，中心频点增益达11.028 dBi，实测结果与仿真高度吻合，实物测试显示在24.14 GHz处的反射系数为-42.807 dB，绝对带宽为0.027 GHz，相对带宽为0.004%，远低于窄带要求的1%。所设计的天线不仅尺寸小、结构简单，且性能良好，满足毫米级近距离位移测量需求。 |
| 英文摘要: |
| Millimeter-scale close-range displacement measurement is widely used in fields such as precision manufacturing, medical monitoring, and aerospace. Owing to its non-contact operation, strong immunity to interference, and moderate spatial resolution, microwave sensing has become an effective technique for such tasks. Conventional loop probe antennas, however, suffer from multi-mode resonances, and achieving a desirable compromise between antenna size and performance remains challenging. To tackle these issues, this paper proposes a Four-Element sector truncated structure based on mode suppression, together with a nested-configuration transceiver antenna. This design effectively suppresses multi-frequency resonances, enabling efficient radiation at a single target frequency of 24.01 GHz while enhancing receive-signal purity and anti-interference capability. Simulations demonstrate that, while maintaining high gain, the antenna size is reduced by 65.385% typical loop probe antennas reported in the literature; the operational bandwidth is below 0.1%; the reflection coefficient at the target frequency reaches -64.001 dB; and the center-frequency gain attains 11.028 dBi. Experimental measurements closely align with the simulations: the fabricated prototype exhibits a reflection coefficient of -42.807 dB at 24.14 GHz, an absolute bandwidth of 0.027 GHz, and the relative bandwidth of 0.004% is far below the narrowband requirement of 1%. Therefore, the developed antenna is not only compact and structurally simple, but also exhibits robust performance, meeting the requirements of millimeter-scale close-range microwave displacement measurement. |
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