一种宽频带高稳定相位中心导航天线的设计

发布时间：2018-06-15 04:09

本文选题：导航天线 + 扼流环　；参考：《电波科学学报》2017年03期

【摘要】：设计了一款基于阿基米德螺旋天线的宽频带高稳定相位中心导航天线.采用阿基米德螺旋天线结构实现了宽带驻波带宽和轴比带宽,结合三维扼流环结构改善了天线相位稳定度和多径抑制能力.通过有限元电磁仿真软件建立了仿真模型和完成了参数优化设计,所设计的宽带高稳定相位中心导航天线的指标达到:在GPS、北斗、GLONASS和Galileo卫星导航系统的所有工作频点上,输入端口驻波比均小于1.45;在俯仰角-60°~60°主波束范围内轴比小于3dB,相位稳定度在-2.5°~2.5°,方向图增益均在5dB以上.相比于未加载扼流环,所设计天线的增益前后比改善2~6dB(仰角60°和仰角120°对应增益差值).该研究表明,结合了三维扼流环结构的阿基米德螺旋天线综合性能优异,适于设计宽频带高稳定相位中心天线.
[Abstract]:A wide band high stable phase center navigation antenna based on Archimedes helical antenna is designed. The wideband standing wave bandwidth and axial ratio bandwidth are realized by using the Archimedes helical antenna structure, and the phase stability and multipath suppression ability of the antenna are improved by combining the three-dimensional choke ring structure. The simulation model and parameter optimization design are established by the finite element electromagnetic simulation software. The designed wideband high stable phase center navigation antenna has achieved the following objectives: on all working frequency points of GPS, Beidou GLONASS and Galileo satellite navigation system, The VSWR of the input port is less than 1.45, the axial ratio is less than 3 dB, the phase stability is -2.5 掳and 2.5 掳, and the pattern gain is above 5 dB in the range of pitch angle -60 掳~ 60 掳main beam. Compared with the unloaded choke loop, the gain ratio of the designed antenna is improved by 2 ~ 6 dB (elevation angle 60 掳and elevation angle 120 掳). The results show that the Archimedes helical antenna with three dimensional choke ring structure has excellent comprehensive performance and is suitable for the design of broadband high stable phase center antenna.
【作者单位】：东南大学毫米波国家重点实验室;中电科技扬州宝军电子有限公司;
【基金】：国家自然科学基金(61471117)
【分类号】：TN965.2

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