oa Selection Of Antennas For Gpr System

The antennas are a significant component of the underground radar<br>tomography system developed for in-seam hazard detection. Several antenna<br>configurations were tested above ground to select those which might be best<br>for underground use. The relative forward gain of each antenna was determined<br>in a series of experiments. The antennas were tested both alone and with<br>reflection shields spaced from fractional to several wavelengths behind the<br>antennas. Antennas included triangular (bow-tie), linear dipoles and<br>monopoles and a series of horn antennas. The results indicate few significant<br>differences in agreement with laboratory modeling tests and place the emphases<br>on operational features i.e. the ease of use as a chief factor in antenna<br>selection.