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UWB Vivaldi Antenna Array Lower Band Improvement for Ground Penetrating Radar Applications

机译：UWB Vivaldi天线阵列较低的频段改进地面穿透雷达应用

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This paper concerns a ground penetrating radar system (GPR) presenting beam forming ability. This ability is due to a great flexibility in the emission of wavefronts. The innovative concept is to use an array of antennas which can reconfigure itself dynamically, in order to focus on a desired target. This antennas system can act as a new microwave sensor to detect and characterize buried targets in an inhomogeneous medium which is the case study in various application fields such as geophysics, medical, planetology… Its electronics are in development with the DORT (Time reversal technique) method integration for optimizing the localization of buried target. This paper aims are to present the antenna optimization used in the GPR applications. Typical antennas used in GPR are generally Vivaldi ones directly on the ground. Especially, in the context of the space mission ExoMars 2020, the radar antenna is set on a mobile station at a distance of about 30 cm from the ground to avoid any contact. However, they are limited by their important size, due to the lowest frequency of their bandwidth. Results of this work concern an increase of the antenna bandwidth by shifting the lower-band limit, making it a UWB type [500 MHz - 4 GHz] without changing its size. As low frequency waves can spread deeper into probed medium, this optimization can improve the radar data inversion performances.
机译：本文涉及呈现光束形成能力的地面穿透雷达系统（GPR）。这种能力是由于波前排放的巨大灵活性。创新的概念是使用一系列天线，该天线可以动态重新配置，以便专注于所需的目标。该天线系统可以充当新的微波传感器，以检测和表征在不均匀介质中的埋地目标，这是在各种应用领域的情况下研究，例如地球物理，医疗，地图集质......其电子产品正在开发中与DORIOR（时间反转技术）进行开发用于优化埋地目标本地化的方法集成。本文旨在介绍GPR应用中使用的天线优化。 GPR中使用的典型天线通常是直接在地面上的Vivaldi。特别地，在空间任务exoMars 2020的上下文中，雷达天线在移动台上设置在距离地约30厘米的移动台上，以避免任何接触。然而，由于带宽的最低频率，它们受到重要规模的限制。这项工作的结果涉及通过移位较低频段限制来增加天线带宽，使其成为[500MHz - 4 GHz]的UWB而不改变其尺寸。由于低频波可以扩散到探测介质中，这种优化可以改善雷达数据反转性能。

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