24 GHz宽波束阵列天线的设计

利用Rogers 5880为介质材料设计了一款应用于车载防撞雷达前端的圆极化微带阵列天线，该阵列天线采用直线阵结构，运用了多个四分之一波长阻抗变换器实现了阻抗匹配。仿真和测试结果表明: 该阵列天线的阻抗带宽(S₁₁ < -10 dB)为23.45~25.65 GHz，最大增益为15.54 dB；轴比带宽24.56~25 GHz，轴比最小为1.25 dB；第一副瓣电平小于-20 dB，E面半功率波瓣宽度为10°，H面波瓣宽度为75°，其尺寸为70.94 mm×14.72 mm×0.508 mm。该天线具有高增益、低副瓣、体积小、性能稳定等优点，在汽车防撞雷达系统中有广阔的应用前景。

Design of antenna array with 24 GHz wide beam

Based on Rogers 5880 dielectric material, a radar front-end circular polarization microstrip antenna array for the vehicle collision avoidance system is designed, which adopts linear array structure and many quarter wave impedance converters to achieve impedance matching. Simulation and test results show that the impedance bandwidth of the antenna array (S₁₁ < -10 dB) is from 23.45 GHz to 25.65 GHz, the biggest gain is 15.54 dB; and the AR(axial ratio) bandwidth is from 24.56GHz to 25GHz, the minimum AR is 1.25 dB. The first sidelobe level is -20 dB, E-plane half power beam width is 10°, H side lobe width is 75°, and the size of the dielectric material is 70.94 mm×14.72 mm×0.508 mm. With the advantages like high gain, low side lobe, small size, and stable performance, the practicability of array antenna is verified and it may be widely applied in automobile anti-collision radars.