Calculation and analysis of ground loss resistance for an electrically small VLF transmitting antenna

To solve the low radiation efficiency of the very low frequency(VLF) electrically small transmitting antenna, which is caused by the low radiation resistance and ground loss, the computations of both the magnetic loss resistance and the electric field loss resistance inside or outside the uniform radiated ground network area are studied with analytical method. According to the method, the loss resistance in various regions of uniform radial ground network can be calculated. The computational results show that the loss of magnetic field resistance is the main part of the ground loss; besides, the uniform radial network is not the optimal mode for laying the ground grid under the condition that the total length of the ground net and its area radius are constant. Based on the above results, a new method for reducing ground loss resistance by laying uniform radial ground nets for various regions is proposed, which provides a new approach for further improving the radiation efficiency of electrically small antenna and is also of certain theoretical and practical value.