新型桅杆材料对舰载雷达副瓣性能影响的研究

设计了一种工作于C/S 波段的带通滤波性能良好的透波材料。该透波材料的周期单元尺寸为10 mm,结构的厚度为20 mm,在2.5~5 GHz 的频带内都有良好的透波性能。基于这种透波材料的舰船顶桅能够大大减小顶桅对舰载雷达天线电性能的影响,特别是对天线方向图副瓣电平抬升的影响。与理想导体相比,采用这种透波材料后,顶桅对舰载雷达天线的副瓣电平抬升作用显著降低,进而降低了雷达产生虚警的概率。天线最大副瓣降幅分别为18.2 dB(C 波段)与7.8 dB(S 波段)。

Research on New Materials for Reducing the Sidelobe Level of Ship-Borne Radar Antennas

In this paper, a wave-transmitting material with good band-pass filtering performance in the C and S bands is designed. The material has a periodic cell size of 10 mm and a structure thickness of 20 mm, revealing wave transmission performance in the band from 2.5 GHz to 5 GHz. The top mast of ships made from this material can greatly improve the electrical performance of the nearby antennas of the shipborne radars, especially the sidelobe level of antenna caused by the top mast. Compared with traditional materials made for the masts, the proposed material reduces the sidelobe levels of the antennas by 18.2 dB at the C band and 7.8 dB at the S band, and a decreased false alert rate can be obtained, showing its potential for future usage.