An experimental study of the circuit properties of coupled insulated antennas

Measurements are reported of the admittances and distributions of current for two parallel insulated monopoles in lake water. Graphs of the admittance and impedance in the complex plane are displayed with the electrical distance between the elements as the parameter. These show significant coupling over electrically large separations. All data were obtained with the antennas driven both in phase and in phase opposition. Three thicknesses of the insulation were used.