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

Aaron A. Chong; Christopher J. Leat; Glen F. Stickley

doi:10.1117/12.383545

27 April 2000 Gain, impedance measurements, and dielectric loading of ground penetrating radar (GPR) antennas using a watertank testing facility

Aaron A. Chong, Christopher J. Leat, Glen F. Stickley

Author Affiliations +

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383545
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

Abstract

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 1200 mm X 600 mm X 600 mm. A mono- pole version of the test antenna is connected to a 150 mm 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 150 mm and 300 mm respectively. Results are presented as gain and impedance plots for a monopole test antenna with two different water levels; 0 mm and 5 mm 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 antennas's base and the water's surface as well as improved fractional bandwidth through dielectric loading.

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Aaron A. Chong, Christopher J. Leat, and Glen F. Stickley "Gain, impedance measurements, and dielectric loading of ground penetrating radar (GPR) antennas using a watertank testing facility", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383545

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