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汽车防撞雷达天线的设计
A DESIGN OF AUTOMOTIVE ANTI-COLLISION RADAR ANTENNA
学位授予单位及代码: (10186)
学科专业名称及代码: (0809)
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摘要
近年来,毫米波汽车防撞雷达系统已经成为汽车应用领域的热点,具有广阔的应用前景。针对系统前端具有高稳定性、体积小和成本低等的要求,本文结合毫米波具有波长短、在雾、雪、尘埃等环境中有良好的传播特性,设计出适合于毫米波汽车防撞雷达系统的圆极化微带天线。具体工作如下:
,本文应用Ansoft HFSS软件设计了单个圆极化微带天线。应用理论计算天线的几何尺寸,并通过软件仿真对天线参数优化,给出合理的几何尺寸及参数值。
,使用相位旋转法(sequential rotation method)对4阵元圆极化阵列天线进行了设计,谐振点在35GHz的附近,阻抗带宽达到17%以上,轴比带宽达到6%以上,增益在以上,水平方位扫描角约为,垂直高低扫描角约为。在此基础上,将阵元数扩展至64,微带阵列天线的增益达到dB以上,水平方位扫描角约为,垂直高低扫描角约为。
本文设计的毫米波圆极化微带阵列天线具有体积小、重量轻、结构紧凑及便于集成等优点,能够满足毫米波汽车防撞雷达系统的需要。
关键词:毫米波汽车防撞圆极化微带天线相位旋转法
ABSTRACT
In recent years automotive anti-collision millimeter-wave (MMW) radar system is widely used in automotive application. Based on the require of high stability and small size for the anti-collision radar front-end, a circularly polarized (CP) microstrip patch antenna has been designed concerning its good radiation characteristics like short wave length, wide band and strong rability in snow, rain and fog etc. The detailed work includes:
1. Based on analyzing the microstrip antenna theory and circularly polarization technology, a CP microstrip patch antenna has been designed using Ansoft HFSS. The thesis has caculated the sizes of the antenna by using theory, optimized the antenna parameters with software simulated and provided the reasonable sizes and parameters.
2. Based on analyzing single CP microstrip antenna, a four-element CP array antenna has been designed using sequential rotation method. The array works at 35GHz with impedance bandwidth over 17%, axial ratio bandwidth over 6% and gain over 12dB, and its azimuth angle and vertical angle reaches about and , respectively. Based on the above analysis, 64-element CP array antenna has been simulated, and the gain has reached 24dB, and its azimuth angle and vertical angle reaches about and , respectively.
The MMW CP antenna desig