用于探地雷达的超宽带天线设计与仿真  

Design and simulation of UWB antenna applied to ground penetrating radar

作　　者：尹诗 郭伟[1] 

机构地区：[1]中国科学院微波遥感重点实验室国家空间科学中心,北京100190 [2]中国科学院大学,北京100049

出　　处：《电子设计工程》2018年第3期98-102,共5页Electronic Design Engineering

摘　　要：探地雷达系统要求收发天线具有超宽带的性能,而且天线中心工作频率越低,信号的穿透能力越强。为了使天线在低频段具有超宽带的性能,本文对传统蝶形天线进行结构加载,采用在天线臂两侧添加椭圆臂、天线臂末端添加半圆臂的方法,通过建模和仿真,对天线表面电流分布情况、端口输入阻抗、回波损耗特性以及天线的频域辐射等情况进行分析,设计出一款工作在100~480 MHz的天线,其相对带宽高达131%,回波损耗小于-10 dB,VSWR小于2,可将其应用于探地雷达系统中。The transmitting/receiving antenna used in a Ground Penetrating Radar must have UWB performance.Besides,the lower the working frequency is,the deeper the signal penetrates.Aiming to implementing the UWB performance in low frequency of an antenna,a new structure loading method,which is adding elliptic structure to the sides of antenna arms and two circular structure to the end of antenna arms,has been proposed.After modeling and simulation,some performance such as current distribution on antenna surface,input impedance at the feed port,return loss and radiation performance in frequency domain have been analyzed.Simulation results show that the proposed antenna works in 100 MHz to 480 MHz with relative bandwidth of 131%,return loss lower than -10 dB and VSWR lower than 2.It can be applied to Ground Penetrating Radar system.

关 键 词：探地雷达 天线 低频段 超宽带 结构加载 

分 类 号：TN957.2[电子电信—信号与信息处理]