一種新型探地雷達(dá)天線(xiàn)的FDTD分析
FDTD Analysis of a Novel GPR Antenna
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摘要: 探地雷達(dá)系統(tǒng)一般采用超寬帶短脈沖信號(hào)，因而其天線(xiàn)系統(tǒng)也必須為寬帶的。該文給出一種新型的探地雷達(dá)天線(xiàn)，該天線(xiàn)為置于鏡像面上且具有離散指數(shù)電阻加載的單偶極子。通過(guò)FDTD法對(duì)該天線(xiàn)輻射特性的仿真計(jì)算表明，選擇合適的電阻加載方式，可以消除由于天線(xiàn)末端阻抗不匹配而引起的二次反射，使天線(xiàn)具有較好的輻射波形和一定的帶寬，從而滿(mǎn)足實(shí)際探地雷達(dá)系統(tǒng)的需要。文中還分析了收發(fā)天線(xiàn)不同組合方式對(duì)直耦信號(hào)和目標(biāo)回波信號(hào)的影響。
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關(guān)鍵詞:
- 探地雷達(dá)天線(xiàn);FDTD方法;廣義完全匹配吸收層
Abstract: The Ground-Penetrating Radar (GPR) systems usually use broadband electromagnetic pulse, so the antennas must be wideband and can couple electromagnetic energy into the ground. A novel GPR antenna that the dipole with discrete exponential resistive loading is above the image plane is present in this paper. Radiation characteristics of the antenna are researched through the Finite Difference Time Domain (FDTD) method. The results show that the antenna in the paper terminates the reflections at the end of antennas through resistive loading, and it can be applied in GPR systems. Several different modes of employed antennas to influence the coupled signal and the scatter signal are also studied. -
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