The combination of metal detection (MD) and ground-penetrating radar (GPR) has been successfully deployed to combat the threat from buried antipersonnel landmines. A number of issues arise from the close integration of these two sensing modalities. One issue is the proximity of the metallic GPR antennas to the MD coils, which affects the performance of the MD due to the eddy currents created within the GPR antenna structure. In this article, the effect of traditional solid bowtie antenna design on an MD is investigated, and avenues for the reduction of the eddy currents are explored. Three modifications to the solid bowtie design are proposed and evaluated. This article presents the measurements of the MD response to all four antenna designs using a magnetic induction spectroscopy sensor. It was found that the MD response to the bowtie antenna can be reduced by 91%-98% across the MD operating frequency band, without significantly altering the RF performance, such as reflection and transmission coefficient and radiation pattern.

中文翻译：

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减少双模态探测器中探地雷达超宽带天线的感应足迹


金属探测（MD）和探地雷达（GPR）的结合已被成功部署，以应对埋藏的杀伤人员地雷的威胁。这两种传感方式的紧密集成会产生许多问题。一个问题是金属探地雷达天线与 MD 线圈的接近度，由于探地雷达天线结构内产生的涡流，这会影响 MD 的性能。在本文中，研究了传统固体领结天线设计对 MD 的影响，并探索了减少涡流的途径。提出并评估了对实心领结设计的三种修改。本文介绍了使用磁感应光谱传感器对所有四种天线设计的 MD 响应的测量结果。研究发现，在整个 MD 工作频段，蝴蝶结天线的 MD 响应可降低 91%-98%，而不会显着改变 RF 性能，例如反射和传输系数以及辐射方向图。