| 摘要: |
| 由于无人机搭载有效载荷的能力有限，对于低频段合成孔径雷达（Synthetic Aperture Radar，SAR），天线固有尺寸难以缩减，小型化和轻量化的设计更加迫切。设计并实现了一款基于H形缝隙耦合馈电的L波段双极化微带贴片天线。该天线采用双层辐射贴片和H形缝隙的组合拓展了带宽，实现了电压驻波比小于2.0及相对带宽为35.38%的性能指标，同时隔离度大于33.07 dB。设计中采用多层结构，有效减小了天线剖面尺寸至48 mm，提高了天线的集成度，实现了小型化。在材料上，选择Kevlar布浸润树脂代替传统结构，实现面密度12.0 kg/m2，满足结构强度的同时实现了轻量化。由于该天线轻便、易于共形，适用于无人机载SAR成像，已经应用于无人机SAR系统研发中，并获取了实测图像。 |
| 关键词: 无人机 合成孔径雷达 微带天线 缝隙耦合 双极化 |
| DOI：10.20079/j.issn.1001-893x.250113006 |
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| 基金项目:境内委托项目:L波段机载干涉SAR载荷系统（E4E2160101） |
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| Slot-coupled Dual-polarized Microstrip Patch Antenna for UAV-borne SAR |
| CHU Fa,LANG Yu,OU Naiming,XU Kaijiang,ZHANG Xuxin,WANG Jili,CHEN Zhen |
| (1.Aerospace Information Research Institute，Chinese Academy of Sciences，Beijing 100190，China;2.School of Electronic，Electrical and Communication Engineering，University of Chinese Academy of Sciences，Beijing 100049，China) |
| Abstract: |
| Due to the limited payload capacity of unmanned aerial vehicles(UAVs)，the miniaturization and weight reduction of synthetic aperture radar (SAR) antennas are particularly critical.For low-frequency SAR systems，such as those operating in the L-band，the inherent large size of the antenna poses significant challenges to size reduction.A dual-polarized L-band microstrip patch antenna based on H-shaped slot-coupled feeding is designed and implemented.The antenna employs a combination of dual-layer radiating patches and H-shaped slots to enhance the bandwidth，achieving a voltage standing wave ratio(VSWR) of less than 2.0 and a relative bandwidth of 35.38%，with an isolation level greater than 33.07 dB.A multilayer structure is adopted to effectively reduce the antenna profile to 48 mm，improving integration and achieving miniaturization.In terms of materials，Kevlar fabric impregnated with resin is used instead of traditional substrates，resulting in an areal density of 12.0 kg/m2，which meets structural strength requirements while ensuring lightweight design.Owing to its compact size，low weight，and conformal capability，the antenna is well-suited for UAV-borne SAR imaging and has been successfully applied in the development of a UAV SAR system，with real measured images obtained. |
| Key words: unmanned aerial vehicle synthetic aperture radar microstrip antenna slot coupling:dual polarization |
《电讯技术》编辑部 