多频圆极化及弹载全向天线的设计

发布时间：2018-06-01 09:09

本文选题：多频 + 圆极化　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：随着各国卫星导航定位系统的发展,宽波束多频圆极化天线是导航定位系统发展的重要方向之一。本文针对这一热点研究方向着重研究了一种多频圆极化天线。与此同时随着卫星导航系统逐步应用于武器制导、轨迹测量和姿态确定等精密科学领域,本文还设计了一款弹载全向天线。首先,对现有的多频段卫星导航定位天线进行了分析与研究,设计了两种多频圆极化天线。分析了天线安装结构及尺寸对其性能的影响,并利用HFSS仿真软件进行了优化设计。在仿真的基础上制作了天线实物,并对天线进行了实物测量。测量结果表明:地面站多频圆极化天线其三个频点工作带宽内驻波系数(VSWR)小于2,轴向增益高于2dBi,仰角15增益高于0dBi;星载多频圆极化天线带宽内驻波系数(VSWR)小于2,?60波束范围内增益大于1dBi,低频相位中心稳定度小于5mm,高频相位中心稳定度小于2mm。其次,设计了一款锥形弹载全向天线,通过设置阵列单元分布实现天线的全向辐射,并通过改变贴片的形状尺寸优化天线的性能。通过HFSS设计了天线的馈电网络,最后制作出天线实物。对该天线进行了测试,结果表明天线在其工作频段内驻波系数(VSWR)小于1.5,单元天线的轴向轴比小于3dB,阵列天线水平面全向轴比小于6dB。天线在其方位面具有很好的辐射方向图,不圆度小于2dB,实现了弹载天线全向辐射的设计要求。
[Abstract]:With the development of satellite navigation and positioning system, wide beam multi-frequency circular polarization antenna is one of the important directions of navigation and positioning system. In this paper, we focus on a multi-frequency circular polarization antenna. At the same time, with the application of satellite navigation system to the precision science of weapon guidance, trajectory measurement and attitude determination, a projectile omnidirectional antenna is designed. Firstly, the existing multi-band satellite navigation and positioning antennas are analyzed and studied, and two kinds of multi-frequency circular polarization antennas are designed. The influence of antenna installation structure and size on its performance is analyzed, and the optimization design is carried out by using HFSS simulation software. On the basis of simulation, the antenna object is made and the antenna is measured. The measurement results show that the VSWR is less than 2, the axial gain is higher than 2dBiand the elevation angle 15 gain is higher than 0dBi.The VSWR within the bandwidth of spaceborne multi-frequency circular polarization antenna is less than 2dSWR. In the range of beam, the gain is greater than 1dBi. the stability of low-frequency phase center is less than 5mm, and the stability of high-frequency phase center is less than 2mm. Secondly, a conical projectile omnidirectional antenna is designed. The omnidirectional radiation of the antenna is realized by setting the array element distribution, and the performance of the antenna is optimized by changing the shape and size of the patch. The antenna feeder network is designed by HFSS, and the antenna is made at last. The results show that the standing wave coefficient (VSWR) is less than 1.5, the axial ratio is less than 3 dB, and the horizontal plane omnidirectional axial ratio of array antenna is less than 6 dB. The antenna has a good radiation pattern in its azimuth mask, and the degree of roundness is less than 2 dB, which meets the design requirement of omnidirectional radiation of the projectile antenna.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1

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