摘要
为保证探地雷达天线与发射系统的良好匹配,文中采用复镜像法分析了贴地偶极天线阻抗在加载和未加载的情况下,天线阻抗随频率和地下煤质参数的变化特性。发现在300MHz到600MHz的高频情况下,天线的输入阻抗随着地下煤质的介电常数(ε_r=2～10)的变化较大,随媒质电导率(σ=0.0001～0.05S/m)的变化较小;在采用分布加载之后,天线的输入阻抗随着地下媒质介电常数的变化量与未加载时基本相同,但天线的频带却得到较大地加宽。
In order to obtain the impedance matching between transmitter and antennas of ground penetrating radar, the impedance of dipole antennas placing on different ground media is calculated with resistance loaded and unloaded. Under the condition of frequency 300MHz and 600MHz actual ground media, (εr=2-10)and (σ=0. 0001-0. 05S/m) , the input impedance of the antennas is varied greatly with the different permittivity, but almost kept constant as the conductivity changed. The change of the impedance vs the media parameters is almost the same for both cases of unloaded and loaded antennas, but the bandwidth of the antennas is widen for the loaded antenna obviously.
出处
《电波科学学报》
EI
CSCD
2003年第4期423-427,共5页
Chinese Journal of Radio Science
基金
教育部"跨世纪优秀人才培养计划"基金
