探地雷達(dá)中蝶形振子天線的改進(jìn)
Improvement on Bow-Tie Antenna of Ground-Penetrating Radar
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摘要: 探地雷達(dá)是進(jìn)行地下環(huán)境無(wú)損探測(cè)的一種有效工具,用來(lái)探測(cè)和識(shí)別地下目標(biāo),比如水管、電力線和通信線路、考古方面的保護(hù)等.然而,傳統(tǒng)的探地雷達(dá)系統(tǒng)在可靠性、分辨率、探測(cè)深度等方面存在不足.因此,改善被測(cè)信號(hào)特性,設(shè)計(jì)和開(kāi)發(fā)更高性能的天線就顯得很有必要.本文研制了一種貼片電阻加載的蝶形振子天線,用時(shí)域有限差分方法對(duì)其進(jìn)行了分析,實(shí)際應(yīng)用結(jié)果表明天線具有良好的波形保真度,良好的輻射特性和屏蔽效果.可以廣泛地應(yīng)用于探地雷達(dá)和其它超寬帶系統(tǒng).
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關(guān)鍵詞:
- 蝶形振子;時(shí)域有限差分方法(FDTD);探地雷達(dá)
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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