末端加载型300 MHz/1GHz双频车载超宽带探地雷达天线设计

一种末端加载型300 MHz／1 GHz双频车载超宽带探地雷达天线设计

内容简介：为满足高速铁路无损探测需兼顾低频探测深度与高频探测精度的要求，采用理论计算与软件仿真结合的方法，设计制作了一种双频带（300 MHz/1 GHz）指数型TEM喇叭天线并对其进行了测量。所设计的指数型TEM喇叭天线采用末端加载和适当天线臂切削来实现此超宽带天线的双频带工作。仿真与实测结果表明，天线分别工作在中心为360 MHz、带宽约为110 MHz的低频带和中心为1020 MHz、带宽约为260 MHz的高频带，相对带宽均大于20％。实测天线的接收信号保真度较高，拖尾持续时间短，满足设计要求。此外，这种双频带天线系统可减少雷达系统天线和采样盒等设备的使用数量，降低雷达系统的成本，有较好工程应用前景。

Abstract： To meet the demand of nondestructive exploration for high-speed railway,which requires outstanding depth in low frequency and resolution in high frequency,a dual-band (300 MHz and 1 GHz)exponential Trans-verse Electric and Magnetic (TEM)horn antenna is designed based on theoretical calculation and numerical simu-lation in this paper . End-loading and arm profiling are utilized in the proposed antenna design for conducting the dual-band performance . Simulation and experiment results show that the antenna works both in 360 MHz and1 020 MHz with bandwidths of 110 MHz and 260 MHz respectively,which exceeds the ultra-wide band(UWB)re-quirement of 20% relative bandwidth . The proposed antenna also has the advantages in signal fidelity and lowringing,which fully meets the design requirements . Furthermore,the proposed dual-band UWB antenna system has more potential advantages in engineering application field because of the low cost of the entire radar system.

作者：郭晨, 张安学, 刘策,

关键词：探地雷达天线, 路基探测, TEM喇叭, 双频带, 末端加载, 超宽带,