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Gain, impedance measurements and dielectric loading of ground penetrating radar (GPR) antennas using a watertank testing facility

机译：使用水箱测试设备的探地雷达（GPR）天线的增益，阻抗测量和介电负载

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摘要

The design and testing of suitable GPR antennas to be used in the field is both an arduous and challenging task. Presented here is a watertank testing facility incorporating a method of measuring gain and impedance of scaled-down models of prospective GPR antennas. A vertical ground plane is placed in a watertank measuring 1200mm×600mm×600mm. A monopole version of the test antenna is connected to a 150mm square plate which fits exactly into the ground plane. Underwater and air probes are placed in a semi-circular fashion on the vertical conducting ground plane around the square plate at radii of 150mm and 300mm respectively. Results are presented as gain and impedance plots for a monopole test antenna with two different water levels; Omm and 5mm below the base of the test antenna. Results for a salty solution and Isopropylalcohol dielectrically loaded, cavity backed, slot bowtie antenna are also given. The results show the sudden change in electrical length that occurs near a half-space surface, lateral wave phenomena as an air gap appears between the antennau27s base and the wateru27s surface as well as improved fractional bandwidth through dielectric loading.
机译：在现场使用合适的GPR天线的设计和测试是一项艰巨而艰巨的任务。这里介绍的是一个水箱测试设备，该设备结合了一种测量预期GPR天线按比例缩小模型的增益和阻抗的方法。将垂直接地平面放置在尺寸为1200mm×600mm×600mm的水箱中。测试天线的单极版本连接到一块150mm的方形板上，该平板正好适合接地平面。水下探头和空气探头以半圆形方式分别放置在围绕正方形板的垂直导电接地平面上，半径分别为150mm和300mm。结果以具有两个不同水位的单极测试天线的增益和阻抗图表示。在测试天线底部下方5毫米和5毫米处。还给出了盐溶液和异丙醇介电负载，腔背，缝隙领结天线的结果。结果表明，电长度的突然变化发生在半空间表面附近，在天线基座和水表面之间出现气隙时出现了侧波现象，并且通过介电负载改善了部分带宽。

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