Analysis of the Electrical Performance of Multituned VLF Thirteen-Tower Umbrella Antennas

Table 2

Parameters of antenna and ground system.

Parameters	Value
Center tower height (m)	298
Inner ring tower height (m)	266
Inner ring radius (m)	558
Outer ring tower height (m)	243
Outer ring radius (m)	935
Sag of top load wires	Inner 4 wires: 4%, outer 4 wires: 5%
Conductor conductivity (S ^∗ m^−1)	5.8 × 10^7
Earth conductivity (S ^∗ m^−1)	0.01
Input power (kW)	679
Model	Model I	Model II
Ground screen radius (m)	500	980
Ground screen density	0–100 m: 240 wires; 100–500 m: 180 wires	0–100 m: 240 wires; 100–300 m: 200 wires; 300–980 m: 180 wires
Buried depth of ground screen (m)	0.3	0.3