一种X波段船舶导航雷达天线设计

Design of a X-band Antenna for Marine Navigation Radar

为了兼顾天线的工作带宽、增益以及旁瓣,文中提出了一种长度约为1 200 mm的通过阵列分隔板改善谐振式波导缝隙阵列天线性能的新型船舶导航雷达天线。该天线通过阵列分隔板将缝隙阵列分隔成四部分以降低天线旁瓣,另外,采用空间极化滤波器技术和喇叭天线结构以改善天线交叉极化和提高天线增益性能,天线馈电采用了紧凑的同轴馈电方式以进一步降低馈电传输损耗以及提高天线的稳固性。仿真结果表明,该天线增益可达28 dB,第一旁瓣电平低于-20.5dB,交叉极化优于-52 dB,水平波束宽度为1.7°,垂直波束宽度为27°。与传统相同长度的船舶导航雷达天线相比,该天线具有更低的损耗以及更好的平衡稳定性。

In order to give consideration to the bandwidth,gain and sidelobe of the antenna,a new type of antenna for marine navigation radar is put forward. The antenna is about 1200 mm long and can improve the performance of the resonant slotted waveguide array antenna through the array division boards. This antenna can reduce the sidelobe by the technology of the array division boards which divide the slot array into four parts. In addition,the spatial polarization filter and the horn antenna structure is used to improve the cross polarization and enhance the performance of the antenna gain. The antenna feed with a compact coaxial structure is used to further reduce the feeding transmission loss and improve the stability of the antenna. The simulation results show that the antenna gain is 28 dB,the first sidelobe level is below-20. 5 dB,the cross polarization is better than-52 dB,the horizontal beam width is 1. 7° and the vertical beam width is 27°. Compared with the traditional same length antenna for marine navigation radar,this antenna has the lower loss and the better balance stability.