用于调频连续波雷达系统的宽带高增益天线阵设计

为满足调频连续波雷达系统终端天线对宽频带高增益指标的需求,设计了一款蝶形印刷偶极子天线阵,使用平行带线馈电网络进行连接,并利用巴伦结构将平行带线变换到50 Ω同轴馈电接头。阵元采用宽偶极子渐变结构以增加带宽,并组成4×4平面天线阵以提高增益。馈电网络采用不等功分和多节阻抗匹配设计,可抑制天线阵副瓣并展宽带宽。对天线进行了实物加工和测试,结果表明在3.8~6.6 GHz频率范围内天线阵回波损耗大于10 dB,相对带宽达到54%,在该频段内天线增益在15 dB以上,最高增益达17 dB。

Design of a wide-band and high-gain antenna array for FMCW radar system

In order to meet the demand for wide band and high gain performance of the frequency modulation continuous wave (FMCW) radar system terminal antenna, a butterfly printed dipole antenna array has been designed. The parallel strip line feed network is used for the connection and the balun is used to transform the parallel strip line to a 50Ω coaxial feed connector. The antenna element adopts a wide dipole tapered structure to increase the bandwidth and forms a 4×4 planar antenna array to increase the gain. The design of unequal power division and multi section impedance matching for the feed network is utilized to suppress the side lobes and expand the bandwidth. The antenna has been fabricated and measured. The measured results show that the antenna array has a return loss of more than 10 dB and a relative bandwidth of 54% in the 3.8-6.6 GHz band. Within this range, antenna gain is higher than 15 dB and the highest gain is 17 dB.