Share Email Print
cover

Proceedings Paper

Gain, impedance measurements, and dielectric loading of ground penetrating radar (GPR) antennas using a watertank testing facility
Author(s): Aaron A. Chong; Christopher J. Leat; Glen F. Stickley
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 27 April 2000
PDF: 6 pages
Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383545
Show Author Affiliations
Aaron A. Chong, Univ. of Queensland (Australia)
Christopher J. Leat, Univ. of Queensland (Australia)
Glen F. Stickley, Univ. of Queensland (Australia)


Published in SPIE Proceedings Vol. 4084:
Eighth International Conference on Ground Penetrating Radar
David A. Noon; Glen F. Stickley; Dennis Longstaff, Editor(s)

© SPIE. Terms of Use
Back to Top