Application of moment method for computing of antenna parameters over dissipative mediums

This work is concerned with computing of electrodynamic parameters of underground antennas, which are usually used for highly secure systems. These systems are placed underground to shield antennas. However, there is a problem of computing for parameter of mentioned devices. We propose a method based on known moment method upgraded by methods of multiport network and stated for linear antennas formed by irregular isolated conductors over random loss medium. Proposed method provides to calculate field over free space by kneed equivalent currents and by taking into account dielectric boundary conditions. An equivalent conducting surface is created for vibrator dielectric surface segmented to dipole antenna. Therefore, vibrator current induces voltage for all couple sides of equivalent surface. Both voltage and currents are related by boundary condition. Therefore, electrodynamics problem is led to solution of “outer” and “inner” problems. We present results of comparison of computed currents for symmetric isolated vibrator placed horizontally over isotropic medium under produced by two announced methods. Here vibrator was designed for HF-band, and computing were done for various medium parameters including dielectric capacity and conductivity. In addition, we have calculated vibrator input impedance. A good agreement was noticed.