新型超宽带天线设计

Design of Novel Ultra-wide Band Antenna

设计一种新型超宽带全向天线。采用交叉结构改善了单极子天线方向图发生分裂的问题。提出了一种多圆嵌套的天线外形曲线,有效地改善了在工作频带内的阻抗匹配特性。在CST软件中建立天线模型,并进行仿真和优化。制作实物并测试,结果显示天线在(0.47—25.5)GHz频带内,反射系数优于-10 dB,带宽比达到了53∶1。全工作频带内方向图稳定,H面不圆度小于5 dB。在电磁环境监测、超宽带通信以及脉冲雷达领域,具有重要的应用价值。

A novel ultra-wide band antenna is proposed.The cross structure and composite circular curve were investigated to improve both the impedance bandwidth and radiation patterns.The proposed antenna was modeled and simulated in CST software.The results demonstrate that the antenna can work well in（0.47—25.5）GHz,with return loss better than-10 dB.The radiation patterns of the proposed antenna keep stable within the whole band.Out-of-roundness of the H plane is better than –5 dB.The proposed antenna shows great value in the fields of ultra-wide band communication systems and radar systems.