探地雷达中蝶形振子天线的改进
Improvement on Bow-Tie Antenna of Ground-Penetrating Radar
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摘要: 探地雷达是进行地下环境无损探测的一种有效工具,用来探测和识别地下目标,比如水管、电力线和通信线路、考古方面的保护等.然而,传统的探地雷达系统在可靠性、分辨率、探测深度等方面存在不足.因此,改善被测信号特性,设计和开发更高性能的天线就显得很有必要.本文研制了一种贴片电阻加载的蝶形振子天线,用时域有限差分方法对其进行了分析,实际应用结果表明天线具有良好的波形保真度,良好的辐射特性和屏蔽效果.可以广泛地应用于探地雷达和其它超宽带系统.Abstract: The ground penetrating radar is greatly expected as an effective tool for nondestructively sensing subsurface environment, detecting and identifying underground objects such as water pipes, power and communication lines, archaeological remains, and so on. However, conventional ground penetrating radar systems are still insufficient for practical uses with respect to reliability, resolution, detectable depth, and so forth. In order to overcome these difficulties, it is important to improve characteristics of signals to be measured. Therefore, the design and development of antennas of higher performances would be invaluable. This paper designed a bow-tie antenna loaded by lumped resistors. Results of finite difference time domain calculation show good fidelity of the wave, and exciting radiation features as well as effect of shielding. It can be widely used in ground penetrating radar and other tra-wide-band systems.
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