Investigation of wideband Coaxial-Fed Circular dipole Array antenna in a Borehole
Investigation of wideband Coaxial-Fed Circular dipole Array antenna in a Borehole
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DOI：
10.1109/iwagpr.2011.5963844
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
S. Ebihara;Y. Wada
中科院分区：
文献类型：
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作者：
S. Ebihara;Y. Wada
本文研究了工作频率在20-250 MHz范围内的同轴馈电井下圆形偶极子阵列的设计。CFCAB用于定向钻孔雷达。在天线中，阵列单元附近有一个长长的导电圆柱体，圆柱体上的散射波与阵列天线中的接收波相互干扰。利用之前提出的干涉准则，我们发现当圆柱体的总长度为40 cm时，天线工作在频带内。为了验证设计，我们在花岗岩中进行了现场实验，证实了带有圆柱体的天线可以正确估计到达方向。
In this paper, we study the design of a Coaxial-Fed Circular dipole Array in a Borehole (CFCAB) for operating frequencies between 20 – 250 MHz. The CFCAB is used for directional borehole radar. In the antenna, there is a long conducting cylinder near the array elements, and scattered waves at the cylinder interfere with received waves in the array antenna. Utilizing the interference criterion, which was previously proposed, we found that the antenna works in the frequency band, when a total length of the cylinder is 40 cm. In order to verify the design, we conducted field experiments in granite, and confirmed that the antenna with the cylinder can correctly estimate the direction of arrival.