Abstract: The methods for calculating the ground loss resistance of a very low frequency (VLF) T-type antenna array with the ground screen are studied. The magnetic field loss produced by the currents on antenna top wires of an arbitrary length is introduced to the classical analytical method. Based on the numerical simulation results of the near fields by the method of moments, the numerical integration of the ground loss power for an antenna array are calculated and a numerical method for computing the loss resistance of the ground screen is established. The loss resistance of the grounding system of a typical antenna array is computed using these two methods respectively. Results agree well with the measured data, and the precision is 30％~50％ better than that of the classical analytical method.

Key words: method of moments, very low frequency antenna, loss resistance