2.4/4.8/7.2 GHz三频段谐波雷达天线的研究与设计

Research and design of 2.4/4.8/7.2 GHz tri-band antenna of harmonic radar

研究设计了一种应用于手持式谐波雷达的三频段单极子天线。天线采用共面波导馈电,通过在单极子天线主辐射体加载L型辐射枝节、在接近主辐射体的接地平面开三角形切口的方法,使其谐振于2.4 GHz,4.8 GHz和7.2 GHz三个频段。同时,在距离天线10 mm处加载金属挡板,使天线辐射方向性增强,并能接收多个方向反射的电磁波。所实现的天线尺寸为54 mm×53 mm×1.6 mm,在三个工作频段上的带宽分别为0.51 GHz(2.35~2.86),1.39 GHz(4.17~5.56),1.46 GHz(6.17~7.63),能够有效覆盖谐波雷达全部的工作频段;由天线的峰值增益和辐射方向图可知,天线在工作频段内增益性能和整体辐射性能良好。

In this paper,a three-band monopole antenna for hand-held harmonic radar is designed.The antenna is fed by a coplanar waveguide.By loading L-shaped radiating branch on the main radiating body of the monopole antenna and cutting a triangular notch on the ground plane close to the main radiating body,the antenna resonates in three frequency bands:2.4 GHz,4.8 GHz and 7.2 GHz.At the same time,a metal baffle is loaded at a distance of10 mm from the antenna to enhance the directionality of antenna radiation and to receive electromagnetic waves reflected in multiple directions.The size of antenna is 54 mm×53 mm×1.6 mm,and the bandwidth in the three operating frequency bands is 0.51 GHz(2.35-2.86 GHz),1.39 GHz(4.17-5.56 GHz),1.46 GHz(6.17-7.63 GHz),respectively.It can effectively cover all the working frequency band of harmonic radar.According to the peak gain and radiation pattern of the antenna,the gain performance and overall radiation performance of the antenna are good in operating frequency band.