FDTD分析探地雷达天线的辐射特性  

Radiation Characteristics of GPR Antenna Through FDTD Method

作　　者：刘立业[1] 粟毅[1] 刘克成[1] 毛钧杰[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073

出　　处：《微波学报》2005年第B04期91-95,共5页Journal of Microwaves

基　　金：国家 863高科技重大课题(2001AA132020)

摘　　要：探地雷达系统一般采用超宽带短脉冲信号,因而其天线系统必须具有较好的宽带性能。只有几种类型的宽带天线能够用于探地雷达系统中,如电阻加载的蝶形天线、TEM喇叭天线及其变形形式。本文将给出一种新型的探地雷达天线,该天线为置于镜像面上且具有离散指数电阻加载的单偶极子。文中将采用FDTD计算和分析该天线在自由空间和有耗媒质上方时的辐射特性。结果表明,通过选择一定的电阻加载形式,可使天线具有较好的辐射波形,从而能够满足实际探地雷达的需要。最后,通过地下目标散射场的理论结果和实验结果说明了本文所采用方法的正确性。The ground penetrating radar （GPR） systems usually use broadband electromagnetic pulse, so the antennas must be wideband and can couple electromagnetic energy into the ground. There are only a few types of antennas that are widely used in GPR systems, such as resistively loaded bow-ties, TEM horns and their modification. A novel GPR antenna that is the dipole with discrete exponential resistive above the image plane is present in paper. Radiation characteristics of the antenna are researched through the finite difference time domain method （ FDTD ） when it is in space and on the above of the lossy media. The results show that the antenna in paper terminates the reflections at the end of antennas through resistive loading, so it can be applied in GPR systems. At last, the simulation and experiment results about the scattering by the buried objects show the method in paper is correct.

关 键 词：探地雷达天线 FDTD方法 广义完全匹配吸收层 

分 类 号：TN957.2[电子电信—信号与信息处理]