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 雷达学报  2015  DOI: 10.12000/JR15070 0

引用本文 [复制中英文]

[复制中文]
Wu Bing-heng, Ji Yi-cai, Fang Guang-you. Design and Analysis of the Distributed Resistor-loading GPR Antenna with Reflected Cavity[J]. Journal of Radars, 2015, x(x): xx–xx. DOI: 10.12000/JR15070.
[复制英文]

文章历史

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Design and Analysis of the Distributed Resistor-loading GPR Antenna with Reflected Cavity
, ,
Shanghai Maritime University, Shanghai 200135, China
Key Laboratory of Electromagnetic Radiation and Sensing Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
Abstract: In this study, we investigated the use of a half-ellipse dipole with distributed resistor-loading. By improving the structure of the antenna arms and using distributed resistor-loading technology, the current reflection at the end of dipole is significantly reduced, the input impedance is improved, and the operation bandwidth is widened. We decreased the backward radiation of the antenna with a cubic metal-reflective cavity and also improved the ground penetration ability. The proposed antenna was simulated and designed with electromagnetic computing software; on the basis of the design results, we fabricated the antenna sample. Measurement results of the return loss and radiation characteristics of the proposed antenna confirm the validity of the simulation. We applied the proposed antenna in a GPR system as an underground target detection experiment; on the basis of the experimental results, we conclude that the antenna is able to meet the needs of GPR systems.
1 引言

2 带反射腔的分布电阻加载天线的设计

2.1 天线臂结构的改进

 图 1 蝶形天线和半椭圆天线的平面结构 Fig.1 Plane structure of bow-tie antenna and half-ellipse antenna
 图 2 半椭圆天线和蝶形天线的输入阻抗 Fig.2 The input impedance of bow-tie antenna and half-ellipse antenna

2.2 电阻加载的设计

 ${R_i} = {\psi \over {L - {x_i}}} \times l$ (1)

2.3 天线的结构

 图 4 天线的结构图 Fig.4 Structure of the antenna
3 实验和仿真结果分析

3.1 天线的输入阻抗和反射损耗特性分析

 图 5 天线的输入阻抗 Fig.5 Antenna input impedance

 图 6 天线的反射损耗 Fig.6 Antenna return loss
3.2 天线的辐射特性分析

 图 7 天线的E面辐射方向图(XOZ面) Fig.7 Antenna E-plane radiation pattern(XOZ plane)
 图 8 天线的H面辐射方向图(YOZ面) Fig.8 Antenna H-plane radiation pattern(YOZ plane)

 图 9 天线时域辐射测试原理图 Fig.9 Antenna transient radiation measurement scheme

 图 10 天线的时域辐射波形 Fig.10 Antenna transient radiation waveform
3.3 天线在探地雷达系统中的实验

 图 11 探地雷达实验状态图 Fig.11 GPR experiment condition
 图 12 实验回波数据的剖面图 Fig.12 B-scan of experiment receiving data
4 结论